blocks|key|832742|text|File+file+=+new+File(dir,+"App.apk");
Intent+intent+=+new+Intent(Intent.ACTION_VIEW);
intent.setDataAndType(Uri.fromFile(file),+"application/vnd.android.package-archive");
startActivity(intent);|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|832743|我也有同样的问题，经过几次尝试后，我的结果是这样的。我不知道为什么，但是单独设置数据和类型搞砸了我的意图。|unstyled|832744|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$B|C]]|$1|D|3|E|5|F|7|J|8|@]|9|@]|A|$]]|$1|G|3|-4|5|F|7|K|8|@]|9|@]|A|$]]]|H|$]]

<pre><code>File file = new File(dir, "App.apk");
Intent intent = new Intent(Intent.ACTION_VIEW);
intent.setDataAndType(Uri.fromFile(file), "application/vnd.android.package-archive");
startActivity(intent);
</code></pre>

I had the same problem and after several attempts, it worked out for me this way. I don't know why, but setting data and type separately screwed up my intent.

blocks|key|832695|text|好吧，我深入挖掘，从Android+Source找到了PackageInstaller应用程序的源代码。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|832696|https://github.com/android/platform_packages_apps_packageinstaller|offset|length|832697|从清单中我发现它需要权限：|832698|++++<uses-permission+android:name="android.permission.INSTALL_PACKAGES"+/>|code-block|syntax|javascript|832699|实际安装过程在确认后进行|832700|Intent+newIntent+=+new+Intent();
newIntent.putExtra(PackageUtil.INTENT_ATTR_APPLICATION_INFO,+mPkgInfo.applicationInfo);
newIntent.setData(mPackageURI);
newIntent.setClass(this,+InstallAppProgress.class);
String+installerPackageName+=+getIntent().getStringExtra(Intent.EXTRA_INSTALLER_PACKAGE_NAME);
if+(installerPackageName+!=+null)+{
+++newIntent.putExtra(Intent.EXTRA_INSTALLER_PACKAGE_NAME,+installerPackageName);
}
startActivity(newIntent);|832701|entityMap|0|LINK|mutability|MUTABLE|url^0|0|0|1U|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|X|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|Y|8|@]|9|@$D|Z|E|10|1|11]]|A|$]]|$1|F|3|G|5|6|7|12|8|@]|9|@]|A|$]]|$1|H|3|I|5|J|7|13|8|@]|9|@]|A|$K|L]]|$1|M|3|N|5|6|7|14|8|@]|9|@]|A|$]]|$1|O|3|P|5|J|7|15|8|@]|9|@]|A|$K|L]]|$1|Q|3|-4|5|6|7|16|8|@]|9|@]|A|$]]]|R|$S|$5|T|U|V|A|$W|C]]]]

Well, I dug deeper, and found sources of PackageInstaller application from Android Source.
<a href="https://github.com/android/platform_packages_apps_packageinstaller" rel="nofollow noreferrer">https://github.com/android/platform_packages_apps_packageinstaller</a>
From manifest I found that it require permission:
<pre><code> &lt;uses-permission android:name=&quot;android.permission.INSTALL_PACKAGES&quot; /&gt;
</code></pre>
And the actual process of installation occurs after confirmation
<pre><code>Intent newIntent = new Intent();
newIntent.putExtra(PackageUtil.INTENT_ATTR_APPLICATION_INFO, mPkgInfo.applicationInfo);
newIntent.setData(mPackageURI);
newIntent.setClass(this, InstallAppProgress.class);
String installerPackageName = getIntent().getStringExtra(Intent.EXTRA_INSTALLER_PACKAGE_NAME);
if (installerPackageName != null) {
 newIntent.putExtra(Intent.EXTRA_INSTALLER_PACKAGE_NAME, installerPackageName);
}
startActivity(newIntent);
</code></pre>

blocks|key|832998|text|我只想分享一个事实，我的apk文件被保存到我的应用程序"Data“目录中，我需要将apk文件的权限更改为完全可读，才能允许以这种方式安装它，否则系统将抛出"Parse+error:+There+a+Problem+Parsing+the+Package"；因此，使用@Horaceman提供的解决方案使：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|832999|File+file+=+new+File(dir,+"App.apk");
file.setReadable(true,+false);
Intent+intent+=+new+Intent(Intent.ACTION_VIEW);
intent.setDataAndType(Uri.fromFile(file),+"application/vnd.android.package-archive");
startActivity(intent);|code-block|syntax|javascript|833000|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

I just want to share the fact that my apk file was saved to my app "Data" directory and that I needed to change the permissions on the apk file to be world readable in order to allow it to be installed that way, otherwise the system was throwing "Parse error: There is a Problem Parsing the Package"; so using solution from @Horaceman that makes:

<pre><code>File file = new File(dir, "App.apk");
file.setReadable(true, false);
Intent intent = new Intent(Intent.ACTION_VIEW);
intent.setDataAndType(Uri.fromFile(file), "application/vnd.android.package-archive");
startActivity(intent);
</code></pre>

blocks|key|833205|text|别忘了请求权限：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|833206|android.Manifest.permission.WRITE_EXTERNAL_STORAGE+
android.Manifest.permission.READ_EXTERNAL_STORAGE|code-block|syntax|javascript|833207|在AndroidManifest.xml中添加提供程序和权限：|833208|<uses-permission+android:name="android.permission.REQUEST_INSTALL_PACKAGES"/>
...
<application>
++++...
++++<provider
++++++++android:name="android.support.v4.content.FileProvider"
++++++++android:authorities="${applicationId}"
++++++++android:exported="false"
++++++++android:grantUriPermissions="true">
++++++++<meta-data
++++++++++++android:name="android.support.FILE_PROVIDER_PATHS"
++++++++++++android:resource="@xml/provider_paths"/>
++++</provider>
</application>|833209|创建XML文件提供程序res/xml/+provider+_paths.xml|833210|<?xml+version="1.0"+encoding="utf-8"?>
<paths+xmlns:android="http://schemas.android.com/apk/res/android">
++++<external-path
++++++++name="external"
++++++++path="."+/>
++++<external-files-path
++++++++name="external_files"
++++++++path="."+/>
++++<cache-path
++++++++name="cache"
++++++++path="."+/>
++++<external-cache-path
++++++++name="external_cache"
++++++++path="."+/>
++++<files-path
++++++++name="files"
++++++++path="."+/>
</paths>|833211|使用下面的示例代码：|833212|+++public+class+InstallManagerApk+extends+AppCompatActivity+{

++++static+final+String+NAME_APK_FILE+=+"some.apk";
++++public+static+final+int+REQUEST_INSTALL+=+0;

+++++@Override
++++protected+void+onCreate(@Nullable+Bundle+savedInstanceState)+{
++++++++super.onCreate(savedInstanceState);

++++++++//+required+permission:
++++++++//+android.Manifest.permission.WRITE_EXTERNAL_STORAGE+
++++++++//+android.Manifest.permission.READ_EXTERNAL_STORAGE

++++++++installApk();

++++}

++++...

++++/**
+++++*+Install+APK+File
+++++*/
++++private+void+installApk()+{

++++++++try+{

++++++++++++File+filePath+=+Environment.getExternalStorageDirectory();//+path+to+file+apk
++++++++++++File+file+=+new+File(filePath,+LoadManagerApkFile.NAME_APK_FILE);

++++++++++++Uri+uri+=+getApkUri(+file.getPath()+);+//+get+Uri+for++each+SDK+Android

++++++++++++Intent+intent+=+new+Intent(Intent.ACTION_INSTALL_PACKAGE);
++++++++++++intent.setData(+uri+);
++++++++++++intent.setFlags(+Intent.FLAG_GRANT_READ_URI_PERMISSION+%7C+Intent.FLAG_ACTIVITY_NEW_TASK+);
++++++++++++intent.putExtra(Intent.EXTRA_NOT_UNKNOWN_SOURCE,+true);
++++++++++++intent.putExtra(Intent.EXTRA_RETURN_RESULT,+true);
++++++++++++intent.putExtra(Intent.EXTRA_INSTALLER_PACKAGE_NAME,+getApplicationInfo().packageName);

++++++++++++if+(+getPackageManager().queryIntentActivities(intent,+0+)+!=+null+)+{//+checked+on+start+Activity

++++++++++++++++startActivityForResult(intent,+REQUEST_INSTALL);

++++++++++++}+else+{
++++++++++++++++throw+new+Exception("don`t+start+Activity.");
++++++++++++}

++++++++}+catch+(+Exception+e+)+{

++++++++++++Log.i(TAG+%2B+":InstallApk",+"Failed+installl+APK+file",+e);
++++++++++++Toast.makeText(getApplicationContext(),+e.getMessage(),+Toast.LENGTH_LONG)
++++++++++++++++.show();

++++++++}

++++}

++++/**
+++++*+Returns+a+Uri+pointing+to+the+APK+to+install.
+++++*/
++++private+Uri+getApkUri(String+path)+{

++++++++//+Before+N,+a+MODE_WORLD_READABLE+file+could+be+passed+via+the+ACTION_INSTALL_PACKAGE
++++++++//+Intent.+Since+N,+MODE_WORLD_READABLE+files+are+forbidden,+and+a+FileProvider+is
++++++++//+recommended.
++++++++boolean+useFileProvider+=+Build.VERSION.SDK_INT+>=+Build.VERSION_CODES.N;

++++++++String+tempFilename+=+"tmp.apk";
++++++++byte[]+buffer+=+new+byte[16384];
++++++++int+fileMode+=+useFileProvider+?+Context.MODE_PRIVATE+:+Context.MODE_WORLD_READABLE;
++++++++try+(InputStream+is+=+new+FileInputStream(new+File(path));
+++++++++++++FileOutputStream+fout+=+openFileOutput(tempFilename,+fileMode))+{

++++++++++++int+n;
++++++++++++while+((n+=+is.read(buffer))+>=+0)+{
++++++++++++++++fout.write(buffer,+0,+n);
++++++++++++}

++++++++}+catch+(IOException+e)+{
++++++++++++Log.i(TAG+%2B+":getApkUri",+"Failed+to+write+temporary+APK+file",+e);
++++++++}

++++++++if+(useFileProvider)+{

++++++++++++File+toInstall+=+new+File(this.getFilesDir(),+tempFilename);
++++++++++++return+FileProvider.getUriForFile(this,++BuildConfig.APPLICATION_ID,+toInstall);

++++++++}+else+{

++++++++++++return+Uri.fromFile(getFileStreamPath(tempFilename));

++++++++}

++++}

++++/**
+++++*+Listener+event+on+installation+APK+file
+++++*/
++++@Override
++++protected+void+onActivityResult(int+requestCode,+int+resultCode,+@Nullable+Intent+data)+{
++++++++super.onActivityResult(requestCode,+resultCode,+data);

++++++++if(requestCode+==+REQUEST_INSTALL)+{

++++++++++++if+(resultCode+==+Activity.RESULT_OK)+{
++++++++++++++++Toast.makeText(this,"Install+succeeded!",+Toast.LENGTH_SHORT).show();
++++++++++++}+else+if+(resultCode+==+Activity.RESULT_CANCELED)+{
++++++++++++++++Toast.makeText(this,"Install+canceled!",+Toast.LENGTH_SHORT).show();
++++++++++++}+else+{
++++++++++++++++Toast.makeText(this,"Install+Failed!",+Toast.LENGTH_SHORT).show();
++++++++++++}

++++++++}

++++}

++++...

}|833213|entityMap^0|0|0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|U|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|V|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|W|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|X|8|@]|9|@]|A|$E|F]]|$1|K|3|L|5|6|7|Y|8|@]|9|@]|A|$]]|$1|M|3|N|5|D|7|Z|8|@]|9|@]|A|$E|F]]|$1|O|3|P|5|6|7|10|8|@]|9|@]|A|$]]|$1|Q|3|R|5|D|7|11|8|@]|9|@]|A|$E|F]]|$1|S|3|-4|5|6|7|12|8|@]|9|@]|A|$]]]|T|$]]

Do not forget to request permissions:

<pre><code>android.Manifest.permission.WRITE_EXTERNAL_STORAGE 
android.Manifest.permission.READ_EXTERNAL_STORAGE
</code></pre>

Add in AndroidManifest.xml the provider and permission:

<pre><code>&lt;uses-permission android:name="android.permission.REQUEST_INSTALL_PACKAGES"/&gt;
...
&lt;application&gt;
 ...
 &lt;provider
 android:name="android.support.v4.content.FileProvider"
 android:authorities="${applicationId}"
 android:exported="false"
 android:grantUriPermissions="true"&gt;
 &lt;meta-data
 android:name="android.support.FILE_PROVIDER_PATHS"
 android:resource="@xml/provider_paths"/&gt;
 &lt;/provider&gt;
&lt;/application&gt;
</code></pre>

Create XML file provider res/xml/provider_paths.xml

<pre><code>&lt;?xml version="1.0" encoding="utf-8"?&gt;
&lt;paths xmlns:android="http://schemas.android.com/apk/res/android"&gt;
 &lt;external-path
 name="external"
 path="." /&gt;
 &lt;external-files-path
 name="external_files"
 path="." /&gt;
 &lt;cache-path
 name="cache"
 path="." /&gt;
 &lt;external-cache-path
 name="external_cache"
 path="." /&gt;
 &lt;files-path
 name="files"
 path="." /&gt;
&lt;/paths&gt;
</code></pre>

Use below example code:

<pre><code> public class InstallManagerApk extends AppCompatActivity {

 static final String NAME_APK_FILE = "some.apk";
 public static final int REQUEST_INSTALL = 0;

 @Override
 protected void onCreate(@Nullable Bundle savedInstanceState) {
 super.onCreate(savedInstanceState);

 // required permission:
 // android.Manifest.permission.WRITE_EXTERNAL_STORAGE 
 // android.Manifest.permission.READ_EXTERNAL_STORAGE

 installApk();

 }

 ...

 /**
 * Install APK File
 */
 private void installApk() {

 try {

 File filePath = Environment.getExternalStorageDirectory();// path to file apk
 File file = new File(filePath, LoadManagerApkFile.NAME_APK_FILE);

 Uri uri = getApkUri( file.getPath() ); // get Uri for each SDK Android

 Intent intent = new Intent(Intent.ACTION_INSTALL_PACKAGE);
 intent.setData( uri );
 intent.setFlags( Intent.FLAG_GRANT_READ_URI_PERMISSION | Intent.FLAG_ACTIVITY_NEW_TASK );
 intent.putExtra(Intent.EXTRA_NOT_UNKNOWN_SOURCE, true);
 intent.putExtra(Intent.EXTRA_RETURN_RESULT, true);
 intent.putExtra(Intent.EXTRA_INSTALLER_PACKAGE_NAME, getApplicationInfo().packageName);

 if ( getPackageManager().queryIntentActivities(intent, 0 ) != null ) {// checked on start Activity

 startActivityForResult(intent, REQUEST_INSTALL);

 } else {
 throw new Exception("don`t start Activity.");
 }

 } catch ( Exception e ) {

 Log.i(TAG + ":InstallApk", "Failed installl APK file", e);
 Toast.makeText(getApplicationContext(), e.getMessage(), Toast.LENGTH_LONG)
 .show();

 }

 }

 /**
 * Returns a Uri pointing to the APK to install.
 */
 private Uri getApkUri(String path) {

 // Before N, a MODE_WORLD_READABLE file could be passed via the ACTION_INSTALL_PACKAGE
 // Intent. Since N, MODE_WORLD_READABLE files are forbidden, and a FileProvider is
 // recommended.
 boolean useFileProvider = Build.VERSION.SDK_INT &gt;= Build.VERSION_CODES.N;

 String tempFilename = "tmp.apk";
 byte[] buffer = new byte[16384];
 int fileMode = useFileProvider ? Context.MODE_PRIVATE : Context.MODE_WORLD_READABLE;
 try (InputStream is = new FileInputStream(new File(path));
 FileOutputStream fout = openFileOutput(tempFilename, fileMode)) {

 int n;
 while ((n = is.read(buffer)) &gt;= 0) {
 fout.write(buffer, 0, n);
 }

 } catch (IOException e) {
 Log.i(TAG + ":getApkUri", "Failed to write temporary APK file", e);
 }

 if (useFileProvider) {

 File toInstall = new File(this.getFilesDir(), tempFilename);
 return FileProvider.getUriForFile(this, BuildConfig.APPLICATION_ID, toInstall);

 } else {

 return Uri.fromFile(getFileStreamPath(tempFilename));

 }

 }

 /**
 * Listener event on installation APK file
 */
 @Override
 protected void onActivityResult(int requestCode, int resultCode, @Nullable Intent data) {
 super.onActivityResult(requestCode, resultCode, data);

 if(requestCode == REQUEST_INSTALL) {

 if (resultCode == Activity.RESULT_OK) {
 Toast.makeText(this,"Install succeeded!", Toast.LENGTH_SHORT).show();
 } else if (resultCode == Activity.RESULT_CANCELED) {
 Toast.makeText(this,"Install canceled!", Toast.LENGTH_SHORT).show();
 } else {
 Toast.makeText(this,"Install Failed!", Toast.LENGTH_SHORT).show();
 }

 }

 }

 ...

}
</code></pre>

blocks|key|1048095|text|在Android+Oreo和更高版本中，我们必须采用不同的方法来编程安装apk。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1048096|+private+void+installApkProgramatically()+{


++++try+{
++++++++File+path+=+activity.getExternalFilesDir(Environment.DIRECTORY_DOWNLOADS);

++++++++File+file+=+new+File(path,+filename);

++++++++Uri+uri;

++++++++if+(file.exists())+{

++++++++++++Intent+unKnownSourceIntent+=+new+Intent(Settings.ACTION_MANAGE_UNKNOWN_APP_SOURCES).setData(Uri.parse(String.format("package:%25s",+activity.getPackageName())));

++++++++++++if+(Build.VERSION.SDK_INT+>=+Build.VERSION_CODES.O)+{

++++++++++++++++if+(!activity.getPackageManager().canRequestPackageInstalls())+{
++++++++++++++++++++startActivityForResult(unKnownSourceIntent,+Constant.UNKNOWN_RESOURCE_INTENT_REQUEST_CODE);
++++++++++++++++}+else+{
++++++++++++++++++++Uri+fileUri+=+FileProvider.getUriForFile(activity.getBaseContext(),+activity.getApplicationContext().getPackageName()+%2B+".provider",+file);
++++++++++++++++++++Intent+intent+=+new+Intent(Intent.ACTION_VIEW,+fileUri);
++++++++++++++++++++intent.putExtra(Intent.EXTRA_NOT_UNKNOWN_SOURCE,+true);
++++++++++++++++++++intent.setDataAndType(fileUri,+"application/vnd.android"+%2B+".package-archive");
++++++++++++++++++++intent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TASK+%7C+Intent.FLAG_ACTIVITY_NEW_TASK);
++++++++++++++++++++intent.addFlags(Intent.FLAG_GRANT_READ_URI_PERMISSION);
++++++++++++++++++++startActivity(intent);
++++++++++++++++++++alertDialog.dismiss();
++++++++++++++++}

++++++++++++}+else+if+(Build.VERSION.SDK_INT+>=+Build.VERSION_CODES.N)+{

++++++++++++++++Intent+intent1+=+new+Intent(Intent.ACTION_INSTALL_PACKAGE);
++++++++++++++++uri+=+FileProvider.getUriForFile(activity.getApplicationContext(),+BuildConfig.APPLICATION_ID+%2B+".provider",+file);
++++++++++++++++activity.grantUriPermission("com.abcd.xyz",+uri,+Intent.FLAG_GRANT_READ_URI_PERMISSION);
++++++++++++++++activity.grantUriPermission("com.abcd.xyz",+uri,+Intent.FLAG_GRANT_WRITE_URI_PERMISSION);
++++++++++++++++intent1.setDataAndType(uri,
++++++++++++++++++++++++"application/*");
++++++++++++++++intent1.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
++++++++++++++++intent1.addFlags(Intent.FLAG_GRANT_READ_URI_PERMISSION);
++++++++++++++++intent1.addFlags(Intent.FLAG_GRANT_WRITE_URI_PERMISSION);
++++++++++++++++startActivity(intent1);

++++++++++++}+else+{
++++++++++++++++Intent+intent+=+new+Intent(Intent.ACTION_VIEW);

++++++++++++++++uri+=+Uri.fromFile(file);

++++++++++++++++intent.setDataAndType(uri,
++++++++++++++++++++++++"application/vnd.android.package-archive");
++++++++++++++++intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
++++++++++++++++startActivity(intent);
++++++++++++}
++++++++}+else+{

++++++++++++Log.i(TAG,+"+file+"+%2B+file.getPath()+%2B+"+does+not+exist");
++++++++}
++++}+catch+(Exception+e)+{

++++++++Log.i(TAG,+""+%2B+e.getMessage());

++++}
}|code-block|syntax|javascript|1048097|在Oreo和更高版本中，我们需要未知的资源安装权限。因此，在活动结果中，您必须检查结果的权限|1048098|++++@Override
public+void+onActivityResult(int+requestCode,+int+resultCode,+@Nullable+Intent+data)+{
++++super.onActivityResult(requestCode,+resultCode,+data);
++++switch+(requestCode)+{

++++++++case+Constant.UNKNOWN_RESOURCE_INTENT_REQUEST_CODE:
++++++++++++switch+(resultCode)+{
++++++++++++++++case+Activity.RESULT_OK:
++++++++++++++++++++installApkProgramatically();

++++++++++++++++++++break;
++++++++++++++++case+Activity.RESULT_CANCELED:
++++++++++++++++++++//unknown+resouce+installation+cancelled

++++++++++++++++++++break;
++++++++++++}
++++++++++++break;
++++}
}|1048099|entityMap^0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|N|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|O|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|P|8|@]|9|@]|A|$E|F]]|$1|K|3|-4|5|6|7|Q|8|@]|9|@]|A|$]]]|L|$]]

In Android Oreo and above version we have to approach different methods to install apk programatically.
<pre><code> private void installApkProgramatically() {


 try {
 File path = activity.getExternalFilesDir(Environment.DIRECTORY_DOWNLOADS);

 File file = new File(path, filename);

 Uri uri;

 if (file.exists()) {

 Intent unKnownSourceIntent = new Intent(Settings.ACTION_MANAGE_UNKNOWN_APP_SOURCES).setData(Uri.parse(String.format(&quot;package:%s&quot;, activity.getPackageName())));

 if (Build.VERSION.SDK_INT &gt;= Build.VERSION_CODES.O) {

 if (!activity.getPackageManager().canRequestPackageInstalls()) {
 startActivityForResult(unKnownSourceIntent, Constant.UNKNOWN_RESOURCE_INTENT_REQUEST_CODE);
 } else {
 Uri fileUri = FileProvider.getUriForFile(activity.getBaseContext(), activity.getApplicationContext().getPackageName() + &quot;.provider&quot;, file);
 Intent intent = new Intent(Intent.ACTION_VIEW, fileUri);
 intent.putExtra(Intent.EXTRA_NOT_UNKNOWN_SOURCE, true);
 intent.setDataAndType(fileUri, &quot;application/vnd.android&quot; + &quot;.package-archive&quot;);
 intent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TASK | Intent.FLAG_ACTIVITY_NEW_TASK);
 intent.addFlags(Intent.FLAG_GRANT_READ_URI_PERMISSION);
 startActivity(intent);
 alertDialog.dismiss();
 }

 } else if (Build.VERSION.SDK_INT &gt;= Build.VERSION_CODES.N) {

 Intent intent1 = new Intent(Intent.ACTION_INSTALL_PACKAGE);
 uri = FileProvider.getUriForFile(activity.getApplicationContext(), BuildConfig.APPLICATION_ID + &quot;.provider&quot;, file);
 activity.grantUriPermission(&quot;com.abcd.xyz&quot;, uri, Intent.FLAG_GRANT_READ_URI_PERMISSION);
 activity.grantUriPermission(&quot;com.abcd.xyz&quot;, uri, Intent.FLAG_GRANT_WRITE_URI_PERMISSION);
 intent1.setDataAndType(uri,
 &quot;application/*&quot;);
 intent1.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
 intent1.addFlags(Intent.FLAG_GRANT_READ_URI_PERMISSION);
 intent1.addFlags(Intent.FLAG_GRANT_WRITE_URI_PERMISSION);
 startActivity(intent1);

 } else {
 Intent intent = new Intent(Intent.ACTION_VIEW);

 uri = Uri.fromFile(file);

 intent.setDataAndType(uri,
 &quot;application/vnd.android.package-archive&quot;);
 intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
 startActivity(intent);
 }
 } else {

 Log.i(TAG, &quot; file &quot; + file.getPath() + &quot; does not exist&quot;);
 }
 } catch (Exception e) {

 Log.i(TAG, &quot;&quot; + e.getMessage());

 }
}
</code></pre>
In Oreo and above version we need unknown resource installation permission. so in activity result u have to check the result for the permission
<pre><code> @Override
public void onActivityResult(int requestCode, int resultCode, @Nullable Intent data) {
 super.onActivityResult(requestCode, resultCode, data);
 switch (requestCode) {

 case Constant.UNKNOWN_RESOURCE_INTENT_REQUEST_CODE:
 switch (resultCode) {
 case Activity.RESULT_OK:
 installApkProgramatically();

 break;
 case Activity.RESULT_CANCELED:
 //unknown resouce installation cancelled

 break;
 }
 break;
 }
}
</code></pre>

blocks|key|833063|text|另一种解决方案不需要对接收应用进行硬编码，因此更安全：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|833064|Intent+intent+=+new+Intent(Intent.ACTION_INSTALL_PACKAGE);
intent.setData(+Uri.fromFile(new+File(pathToApk))+);
startActivity(intent);|code-block|syntax|javascript|833065|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

Another solution that doesn't not require to hard-code the receiving app and that is therefore safer:

<pre><code>Intent intent = new Intent(Intent.ACTION_INSTALL_PACKAGE);
intent.setData( Uri.fromFile(new File(pathToApk)) );
startActivity(intent);
</code></pre>

blocks|key|1047503|text|是的这是可能的。但要做到这一点，你需要手机安装未经验证的来源。例如，slideMe就是这样做的。我认为你能做的最好的事情就是检查应用程序是否存在，并向Android+Market发送一个意向。你应该使用android+Market的url方案。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1047504|market://details?id=package.name|code-block|syntax|javascript|1047505|我不知道如何开始这个活动，但是如果你用这种url开始一个活动。它应该会打开android市场，让你可以选择安装应用程序。|1047506|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|L|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|M|8|@]|9|@]|A|$]]|$1|I|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|J|$]]

Yes it's possible. But for that you need the phone to install unverified sources. For example, slideMe does that. I think the best thing you can do is to check if the application is present and send an intent for the Android Market. you should use something the url scheme for android Market.

<pre><code>market://details?id=package.name
</code></pre>

I don't know exactly how to start the activity but if you start an activity with that kind of url. It should open the android market and give you the choice to install the apps.

blocks|key|1047771|text|值得注意的是，如果您使用DownloadManager开始下载，请确保将其保存到外部位置，例如setDestinationInExternalFilesDir(c,+null,+"<your+name+here>).apk";。带有包存档类型的意图看起来不像用于下载到内部位置的content:方案，但确实像file:。(试图将内部路径封装到一个文件对象中，然后获取路径也是行不通的，尽管它会得到一个file:+url，因为应用程序不会解析apk；看起来它肯定是外部的。)|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|1047772|示例：|1047773|int+uriIndex+=+cursor.getColumnIndex(DownloadManager.COLUMN_LOCAL_URI);
String+downloadedPackageUriString+=+cursor.getString(uriIndex);
File+mFile+=+new+File(Uri.parse(downloadedPackageUriString).getPath());
Intent+promptInstall+=+new+Intent(Intent.ACTION_VIEW)
++++++++.setDataAndType(Uri.fromFile(mFile),+"application/vnd.android.package-archive")
++++++++.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
appContext.startActivity(promptInstall);|code-block|syntax|javascript|1047774|entityMap^0|C|F|1B|1U|3V|8|4A|5|5K|5|0|0|0^^$0|@$1|2|3|4|5|6|7|O|8|@$9|P|A|Q|B|C]|$9|R|A|S|B|C]|$9|T|A|U|B|C]|$9|V|A|W|B|C]|$9|X|A|Y|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|Z|8|@]|D|@]|E|$]]|$1|H|3|I|5|J|7|10|8|@]|D|@]|E|$K|L]]|$1|M|3|-4|5|6|7|11|8|@]|D|@]|E|$]]]|N|$]]

It's worth noting that if you use the <code>DownloadManager</code> to kick off your download, be sure to save it to an external location e.g. <code>setDestinationInExternalFilesDir(c, null, "&lt;your name here&gt;).apk";</code>. The intent with a package-archive type doesn't appear to like the <code>content:</code> scheme used with downloads to an internal location, but does like <code>file:</code>. (Trying to wrap the internal path into a File object and then getting the path doesn't work either, even though it results in a <code>file:</code> url, as the app won't parse the apk; looks like it must be external.)

Example:

<pre><code>int uriIndex = cursor.getColumnIndex(DownloadManager.COLUMN_LOCAL_URI);
String downloadedPackageUriString = cursor.getString(uriIndex);
File mFile = new File(Uri.parse(downloadedPackageUriString).getPath());
Intent promptInstall = new Intent(Intent.ACTION_VIEW)
 .setDataAndType(Uri.fromFile(mFile), "application/vnd.android.package-archive")
 .addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
appContext.startActivity(promptInstall);
</code></pre>

blocks|key|832796|text|这只是一个扩展，如果有人需要一个库，那么this可能会提供帮助。感谢Raghav|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|832797|entityMap|0|LINK|mutability|MUTABLE|url|https://github.com/RaghavSood/AppaholicsUpdateChecker|1|https://stackoverflow.com/users/1069068/raghav-sood^0|K|4|0|Y|6|1|0^^$0|@$1|2|3|4|5|6|7|N|8|@]|9|@$A|O|B|P|1|Q]|$A|R|B|S|1|T]]|C|$]]|$1|D|3|-4|5|6|7|U|8|@]|9|@]|C|$]]]|E|$F|$5|G|H|I|C|$J|K]]|L|$5|G|H|I|C|$J|M]]]]

Just an extension, if anyone need a library then <a href="https://github.com/RaghavSood/AppaholicsUpdateChecker" rel="nofollow noreferrer">this</a> might help. Thanks to <a href="https://stackoverflow.com/users/1069068/raghav-sood">Raghav</a>

blocks|key|1047914|text|尝尝这个|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1047915|String+filePath+=+cursor.getString(cursor.getColumnIndex(DownloadManager.COLUMN_LOCAL_FILENAME));
String+title+=+filePath.substring(+filePath.lastIndexOf('/')%2B1,+filePath.length()+);
Intent+intent+=+new+Intent(Intent.ACTION_VIEW);
intent.setDataAndType(Uri.fromFile(new+File(filePath)),+"application/vnd.android.package-archive");
intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);+//+without+this+flag+android+returned+a+intent+error!
MainActivity.this.startActivity(intent);|code-block|syntax|javascript|1047916|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

try this

<pre><code>String filePath = cursor.getString(cursor.getColumnIndex(DownloadManager.COLUMN_LOCAL_FILENAME));
String title = filePath.substring( filePath.lastIndexOf('/')+1, filePath.length() );
Intent intent = new Intent(Intent.ACTION_VIEW);
intent.setDataAndType(Uri.fromFile(new File(filePath)), "application/vnd.android.package-archive");
intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK); // without this flag android returned a intent error!
MainActivity.this.startActivity(intent);
</code></pre>

blocks|key|1047995|text|首先，将以下行添加到AndroidManifest.xml：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1047996|<uses-permission+android:name="android.permission.INSTALL_PACKAGES"
++++tools:ignore="ProtectedPermissions"+/>|code-block|syntax|javascript|1047997|然后使用以下代码安装apk：|1047998|File+sdCard+=+Environment.getExternalStorageDirectory();
++++++++++++String+fileStr+=+sdCard.getAbsolutePath()+%2B+"/MyApp";//+%2B+"app-release.apk";
++++++++++++File+file+=+new+File(fileStr,+"TaghvimShamsi.apk");
++++++++++++Intent+promptInstall+=+new+Intent(Intent.ACTION_VIEW).setDataAndType(Uri.fromFile(file),
++++++++++++++++++++"application/vnd.android.package-archive");
++++++++++++startActivity(promptInstall);|1047999|entityMap^0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|N|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|O|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|P|8|@]|9|@]|A|$E|F]]|$1|K|3|-4|5|6|7|Q|8|@]|9|@]|A|$]]]|L|$]]

First add the following line to AndroidManifest.xml :

<pre><code>&lt;uses-permission android:name="android.permission.INSTALL_PACKAGES"
 tools:ignore="ProtectedPermissions" /&gt;
</code></pre>

Then use the following code to install apk:

<pre><code>File sdCard = Environment.getExternalStorageDirectory();
 String fileStr = sdCard.getAbsolutePath() + "/MyApp";// + "app-release.apk";
 File file = new File(fileStr, "TaghvimShamsi.apk");
 Intent promptInstall = new Intent(Intent.ACTION_VIEW).setDataAndType(Uri.fromFile(file),
 "application/vnd.android.package-archive");
 startActivity(promptInstall);
</code></pre>

blocks|key|832875|text|UpdateNode为安卓提供了从其他应用内部安装APK包的接口。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|832876|您只需定义您的在线更新，并将API集成到您的应用程序中-就是这样。|832877|目前API处于Beta状态，但您已经可以自己做一些测试了。|832878|除此之外，UpdateNode还提供了通过系统显示消息的功能-如果你想告诉用户一些重要的事情，这是非常有用的。|832879|我是客户端开发团队的一员，至少在我自己的Android应用程序中使用消息功能。|832880|See+here+a+description+how+to+integrate+the+API|832881|entityMap|0|LINK|mutability|MUTABLE|url|http://www.updatenode.com/|1|https://www.updatenode.com/profile/android^0|0|A|0|0|0|0|0|0|0|1B|1|0^^$0|@$1|2|3|4|5|6|7|X|8|@]|9|@$A|Y|B|Z|1|10]]|C|$]]|$1|D|3|E|5|6|7|11|8|@]|9|@]|C|$]]|$1|F|3|G|5|6|7|12|8|@]|9|@]|C|$]]|$1|H|3|I|5|6|7|13|8|@]|9|@]|C|$]]|$1|J|3|K|5|6|7|14|8|@]|9|@]|C|$]]|$1|L|3|M|5|6|7|15|8|@]|9|@$A|16|B|17|1|18]]|C|$]]|$1|N|3|-4|5|6|7|19|8|@]|9|@]|C|$]]]|O|$P|$5|Q|R|S|C|$T|U]]|V|$5|Q|R|S|C|$T|W]]]]

<a href="http://www.updatenode.com" rel="nofollow">UpdateNode</a> provides an API for Android to install APK packages from inside another App.
 
You can just define your Update online and integrate the API into your App - that's it.
 
Currently the API is in Beta state, but you can already do some tests yourself. 
Beside that, UpdateNode offers also displaying messages though the system - pretty useful if you want to tell something important to your users.
 
I am part of the client dev team and am using at least the message functionality for my own Android App.

<a href="https://www.updatenode.com/profile/android" rel="nofollow">See here a description how to integrate the API</a>

blocks|key|833112|text|试试这个--写在清单上：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|833113|uses-permission+android:name="android.permission.INSTALL_PACKAGES"
++++++++tools:ignore="ProtectedPermissions"|code-block|syntax|javascript|833114|编写代码：|833115|File+sdCard+=+Environment.getExternalStorageDirectory();
String+fileStr+=+sdCard.getAbsolutePath()+%2B+"/Download";//+%2B+"app-release.apk";
File+file+=+new+File(fileStr,+"app-release.apk");
Intent+promptInstall+=+new+Intent(Intent.ACTION_VIEW).setDataAndType(Uri.fromFile(file),
++++++++++++++++++++++++"application/vnd.android.package-archive");

startActivity(promptInstall);|833116|entityMap^0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|N|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|O|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|P|8|@]|9|@]|A|$E|F]]|$1|K|3|-4|5|6|7|Q|8|@]|9|@]|A|$]]]|L|$]]

Try this
- Write on Manifest:

<pre><code>uses-permission android:name="android.permission.INSTALL_PACKAGES"
 tools:ignore="ProtectedPermissions"
</code></pre>

Write the Code:

<pre><code>File sdCard = Environment.getExternalStorageDirectory();
String fileStr = sdCard.getAbsolutePath() + "/Download";// + "app-release.apk";
File file = new File(fileStr, "app-release.apk");
Intent promptInstall = new Intent(Intent.ACTION_VIEW).setDataAndType(Uri.fromFile(file),
 "application/vnd.android.package-archive");

startActivity(promptInstall);
</code></pre>

blocks|key|1048176|text|基于answer+@UrošPodkrižnik。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|1048177|通过APK安装应用程序可能因android的不同版本(API级别21-30)而有所不同：|1048178|private+var+uri:+Uri?+=+null
private+var+manager:+DownloadManager?+=+null
private+var+file:+File?+=+null
private+var+request:+DownloadManager.Request?+=+null

private+val+REQUEST_WRITE_PERMISSION+=+786
private+val+REQUEST_INSTALL_PACKAGE+=+1234

private+var+receiver:+BroadcastReceiver?+=+null
private+var+installIntent:+Intent?+=+null

...
override+fun+onViewCreated(view:+View,+savedInstanceState:+Bundle?)+{
++++val+externalStorageDir+=+if+(Build.VERSION.SDK_INT+>=+Build.VERSION_CODES.Q)+{
++++++++context?.getExternalFilesDir(Environment.DIRECTORY_DOWNLOADS)
++++}+else+{
++++++++@Suppress("DEPRECATION")
++++++++Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_DOWNLOADS)
++++}
++++val+destination+=+"$externalStorageDir/Application.apk"
++++uri+=+Uri.parse("file://$destination")

++++file+=+File(destination)
++++file?.let+{+if+(it.exists())+it.delete()+}
++++
++++request+=+DownloadManager.Request(Uri.parse("https://path_to_file/application.apk"))
++++request?.let+{
++++++++it.setDescription("Update+App")
++++++++it.setTitle("Application")
++++++++it.setDestinationUri(uri)
++++}
++++manager+=+context?.getSystemService(Context.DOWNLOAD_SERVICE)+as+DownloadManager

++++//+for+level+android+api+>=+23+needs+permission+to+write+to+external+storage
++++if+(Build.VERSION.SDK_INT+>=+Build.VERSION_CODES.M)+{
++++++++if+(ContextCompat.checkSelfPermission(context!!,+Manifest.permission.WRITE_EXTERNAL_STORAGE)+==+PackageManager.PERMISSION_GRANTED)+{
++++++++++++//+here+you+can+display+the+loading+diagram
++++++++++++registerReceiver()
++++++++}+else+{
++++++++++++//+request+for+permission+to+write+to+external+storage
++++++++++++requestPermissions(
++++++++++++++++arrayOf(Manifest.permission.WRITE_EXTERNAL_STORAGE),
++++++++++++++++REQUEST_WRITE_PERMISSION
++++++++++++)
++++++++}
++++}+else+{
++++++++//+here+you+can+display+the+loading+diagram
++++++++registerReceiver()
++++}
}|code-block|syntax|javascript|1048179|创建并注册receiver：|1048180|private+val+onDownloadComplete+=+object+:+BroadcastReceiver()+{
++++//+install+app+when+apk+is+loaded
++++override+fun+onReceive(ctxt:+Context,+intent:+Intent)+{
++++++++val+mimeType+=+"application/vnd.android.package-archive"
++++++++receiver+=+this
++++++++try+{
++++++++++++installIntent+=+Intent(Intent.ACTION_VIEW)
++++++++++++installIntent?.flags+=+Intent.FLAG_ACTIVITY_CLEAR_TOP

++++++++++++//+for+android+api+>=+24+requires+FileProvider
++++++++++++if+(Build.VERSION.SDK_INT+>=+Build.VERSION_CODES.N)+{
++++++++++++++++installIntent?.addFlags(Intent.FLAG_GRANT_READ_URI_PERMISSION)

++++++++++++++++val+fileProviderURI+=+FileProvider.getUriForFile(
++++++++++++++++++++context!!,
++++++++++++++++++++context!!.applicationContext.packageName+%2B+".provider",
++++++++++++++++++++file!!)

++++++++++++++++installIntent?.setDataAndType(fileProviderURI,+mimeType)

++++++++++++++++//+for+android+api+>=+26+requires+permission+to+install+from+APK+in+settings
++++++++++++++++if+(Build.VERSION.SDK_INT+>=+Build.VERSION_CODES.O)+{
++++++++++++++++++++if+(context!!.applicationContext.packageManager.canRequestPackageInstalls())+{
++++++++++++++++++++++++installFromAPK()
++++++++++++++++++++}+else+goToSecuritySettings()
++++++++++++++++}+else+installFromAPK()
++++++++++++}+else+{
++++++++++++++++//+for+android+api+<+24+used+file://+instead+content://
++++++++++++++++//+(no+need+to+use+FileProvider)
++++++++++++++++installIntent?.setDataAndType(uri,+mimeType)
++++++++++++++++installFromAPK()
++++++++++++}
++++++++}+catch+(e:+Exception)+{
++++++++++++//+view+error+message
++++++++}
++++}
}

private+fun+registerReceiver()+{
++++manager!!.enqueue(request)
++++context?.registerReceiver(
++++++++onDownloadComplete,
++++++++IntentFilter(DownloadManager.ACTION_DOWNLOAD_COMPLETE)
++++)
}

private+fun+installFromAPK()+{
++++try+{
++++++++startActivity(installIntent)
++++++++context?.unregisterReceiver(receiver)
++++++++activity?.finish()
++++}+catch+(e:+Exception)+{
++++++++//+view+error+message
++++}
}

//+go+to+settings+for+get+permission+install+from+APK
private+fun+goToSecuritySettings()+{
++++val+intent+=+Intent(Settings.ACTION_MANAGE_UNKNOWN_APP_SOURCES).setData(
++++++++Uri.parse(String.format(
++++++++++++"package:%25s",
++++++++++++context!!.applicationContext.packageName
++++++++))
++++)
++++try+{
++++++++startActivityForResult(intent,+REQUEST_INSTALL_PACKAGE)
++++}+catch+(e:+Exception)+{
++++++++//+view+error+message
++++}
}|1048181|截取权限请求WRITE_EXTERNAL_STORAGE的结果：|1048182|override+fun+onRequestPermissionsResult(
++++++++requestCode:+Int,
++++++++permissions:+Array<String>,
++++++++grantResults:+IntArray
)+{
++++super.onRequestPermissionsResult(requestCode,+permissions,+grantResults)
++++if+(requestCode+==+REQUEST_WRITE_PERMISSION
++++++++++++&&+grantResults.isNotEmpty()
++++++++++++&&+grantResults[0]+==+PackageManager.PERMISSION_GRANTED)+{
++++++++try+{
++++++++++++//+here+you+can+display+the+loading+diagram
++++++++++++registerReceiver()
++++++++}+catch+(e:+Exception)+{
++++++++++++//+view+error+message
++++++++}
++++}
}|1048183|在安全设置中截取用户选择的结果：|1048184|@RequiresApi(api+=+Build.VERSION_CODES.O)
override+fun+onActivityResult(requestCode:+Int,+resultCode:+Int,+data:+Intent?)+{
++++super.onActivityResult(requestCode,+resultCode,+data)
++++if+(requestCode+==+REQUEST_INSTALL_PACKAGE
++++++++++++&&+resultCode+==+AppCompatActivity.RESULT_OK)+{
++++++++if+(context!!.applicationContext.packageManager.canRequestPackageInstalls())+{
++++++++++++installFromAPK()
++++++++}
++++}+else+{
++++++++//+view+error+message
++++}
}|1048185|添加到您的清单中：|1048186|<uses-permission+android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
<uses-permission+android:name="android.permission.READ_EXTERNAL_STORAGE"/>
<uses-permission+android:name="android.permission.REQUEST_INSTALL_PACKAGES"/>
<application...>
++++...
++++<provider
++++++++android:name="androidx.core.content.FileProvider"
++++++++android:authorities="${applicationId}.provider"
++++++++android:exported="false"
++++++++android:grantUriPermissions="true">
++++++++<meta-data
++++++++++++android:name="android.support.FILE_PROVIDER_PATHS"
++++++++++++android:resource="@xml/provider_paths"+/>
++++</provider>
++++...
</application>|1048187|将provider_paths.xml文件添加到res/xml：|1048188|<?xml+version="1.0"+encoding="utf-8"?>
<paths>
++++<external-path+name="external_files"+path="."/>
</paths>|1048189|对于android+API+level+=+30，从安全设置返回不起作用，所以使用浏览器安装：|1048190|try+{
++++val+intent+=+Intent(Intent.ACTION_VIEW)
++++intent.data+=+Uri.parse("https://path_to_file/application.apk")
++++startActivity(intent)
++++activity?.finish()
}+catch+(e:+ActivityNotFoundException)+{+}|1048191|entityMap|0|LINK|mutability|MUTABLE|url|https://stackoverflow.com/questions/4967669/android-install-apk-programmatically^0|2|6|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|1G|8|@]|9|@$A|1H|B|1I|1|1J]]|C|$]]|$1|D|3|E|5|6|7|1K|8|@]|9|@]|C|$]]|$1|F|3|G|5|H|7|1L|8|@]|9|@]|C|$I|J]]|$1|K|3|L|5|6|7|1M|8|@]|9|@]|C|$]]|$1|M|3|N|5|H|7|1N|8|@]|9|@]|C|$I|J]]|$1|O|3|P|5|6|7|1O|8|@]|9|@]|C|$]]|$1|Q|3|R|5|H|7|1P|8|@]|9|@]|C|$I|J]]|$1|S|3|T|5|6|7|1Q|8|@]|9|@]|C|$]]|$1|U|3|V|5|H|7|1R|8|@]|9|@]|C|$I|J]]|$1|W|3|X|5|6|7|1S|8|@]|9|@]|C|$]]|$1|Y|3|Z|5|H|7|1T|8|@]|9|@]|C|$I|J]]|$1|10|3|11|5|6|7|1U|8|@]|9|@]|C|$]]|$1|12|3|13|5|H|7|1V|8|@]|9|@]|C|$I|J]]|$1|14|3|15|5|6|7|1W|8|@]|9|@]|C|$]]|$1|16|3|17|5|H|7|1X|8|@]|9|@]|C|$I|J]]|$1|18|3|-4|5|6|7|1Y|8|@]|9|@]|C|$]]]|19|$1A|$5|1B|1C|1D|C|$1E|1F]]]]

Based on <a href="https://stackoverflow.com/questions/4967669/android-install-apk-programmatically">answer</a> @Uroš Podkrižnik.
Installing the application through the APK may differ for various versions of android (API Levels 21-30):
<pre><code>private var uri: Uri? = null
private var manager: DownloadManager? = null
private var file: File? = null
private var request: DownloadManager.Request? = null

private val REQUEST_WRITE_PERMISSION = 786
private val REQUEST_INSTALL_PACKAGE = 1234

private var receiver: BroadcastReceiver? = null
private var installIntent: Intent? = null

...
override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
 val externalStorageDir = if (Build.VERSION.SDK_INT &gt;= Build.VERSION_CODES.Q) {
 context?.getExternalFilesDir(Environment.DIRECTORY_DOWNLOADS)
 } else {
 @Suppress(&quot;DEPRECATION&quot;)
 Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_DOWNLOADS)
 }
 val destination = &quot;$externalStorageDir/Application.apk&quot;
 uri = Uri.parse(&quot;file://$destination&quot;)

 file = File(destination)
 file?.let { if (it.exists()) it.delete() }
 
 request = DownloadManager.Request(Uri.parse(&quot;https://path_to_file/application.apk&quot;))
 request?.let {
 it.setDescription(&quot;Update App&quot;)
 it.setTitle(&quot;Application&quot;)
 it.setDestinationUri(uri)
 }
 manager = context?.getSystemService(Context.DOWNLOAD_SERVICE) as DownloadManager

 // for level android api &gt;= 23 needs permission to write to external storage
 if (Build.VERSION.SDK_INT &gt;= Build.VERSION_CODES.M) {
 if (ContextCompat.checkSelfPermission(context!!, Manifest.permission.WRITE_EXTERNAL_STORAGE) == PackageManager.PERMISSION_GRANTED) {
 // here you can display the loading diagram
 registerReceiver()
 } else {
 // request for permission to write to external storage
 requestPermissions(
 arrayOf(Manifest.permission.WRITE_EXTERNAL_STORAGE),
 REQUEST_WRITE_PERMISSION
 )
 }
 } else {
 // here you can display the loading diagram
 registerReceiver()
 }
}
</code></pre>
Create and register receiver:
<pre><code>private val onDownloadComplete = object : BroadcastReceiver() {
 // install app when apk is loaded
 override fun onReceive(ctxt: Context, intent: Intent) {
 val mimeType = &quot;application/vnd.android.package-archive&quot;
 receiver = this
 try {
 installIntent = Intent(Intent.ACTION_VIEW)
 installIntent?.flags = Intent.FLAG_ACTIVITY_CLEAR_TOP

 // for android api &gt;= 24 requires FileProvider
 if (Build.VERSION.SDK_INT &gt;= Build.VERSION_CODES.N) {
 installIntent?.addFlags(Intent.FLAG_GRANT_READ_URI_PERMISSION)

 val fileProviderURI = FileProvider.getUriForFile(
 context!!,
 context!!.applicationContext.packageName + &quot;.provider&quot;,
 file!!)

 installIntent?.setDataAndType(fileProviderURI, mimeType)

 // for android api &gt;= 26 requires permission to install from APK in settings
 if (Build.VERSION.SDK_INT &gt;= Build.VERSION_CODES.O) {
 if (context!!.applicationContext.packageManager.canRequestPackageInstalls()) {
 installFromAPK()
 } else goToSecuritySettings()
 } else installFromAPK()
 } else {
 // for android api &lt; 24 used file:// instead content://
 // (no need to use FileProvider)
 installIntent?.setDataAndType(uri, mimeType)
 installFromAPK()
 }
 } catch (e: Exception) {
 // view error message
 }
 }
}

private fun registerReceiver() {
 manager!!.enqueue(request)
 context?.registerReceiver(
 onDownloadComplete,
 IntentFilter(DownloadManager.ACTION_DOWNLOAD_COMPLETE)
 )
}

private fun installFromAPK() {
 try {
 startActivity(installIntent)
 context?.unregisterReceiver(receiver)
 activity?.finish()
 } catch (e: Exception) {
 // view error message
 }
}

// go to settings for get permission install from APK
private fun goToSecuritySettings() {
 val intent = Intent(Settings.ACTION_MANAGE_UNKNOWN_APP_SOURCES).setData(
 Uri.parse(String.format(
 &quot;package:%s&quot;,
 context!!.applicationContext.packageName
 ))
 )
 try {
 startActivityForResult(intent, REQUEST_INSTALL_PACKAGE)
 } catch (e: Exception) {
 // view error message
 }
}
</code></pre>
Intercept the result of the permission request WRITE_EXTERNAL_STORAGE:
<pre><code>override fun onRequestPermissionsResult(
 requestCode: Int,
 permissions: Array&lt;String&gt;,
 grantResults: IntArray
) {
 super.onRequestPermissionsResult(requestCode, permissions, grantResults)
 if (requestCode == REQUEST_WRITE_PERMISSION
 &amp;&amp; grantResults.isNotEmpty()
 &amp;&amp; grantResults[0] == PackageManager.PERMISSION_GRANTED) {
 try {
 // here you can display the loading diagram
 registerReceiver()
 } catch (e: Exception) {
 // view error message
 }
 }
}
</code></pre>
Intercept the result of user selection in security settings:
<pre><code>@RequiresApi(api = Build.VERSION_CODES.O)
override fun onActivityResult(requestCode: Int, resultCode: Int, data: Intent?) {
 super.onActivityResult(requestCode, resultCode, data)
 if (requestCode == REQUEST_INSTALL_PACKAGE
 &amp;&amp; resultCode == AppCompatActivity.RESULT_OK) {
 if (context!!.applicationContext.packageManager.canRequestPackageInstalls()) {
 installFromAPK()
 }
 } else {
 // view error message
 }
}
</code></pre>
Add to your manifest:
<pre><code>&lt;uses-permission android:name=&quot;android.permission.WRITE_EXTERNAL_STORAGE&quot;/&gt;
&lt;uses-permission android:name=&quot;android.permission.READ_EXTERNAL_STORAGE&quot;/&gt;
&lt;uses-permission android:name=&quot;android.permission.REQUEST_INSTALL_PACKAGES&quot;/&gt;
&lt;application...&gt;
 ...
 &lt;provider
 android:name=&quot;androidx.core.content.FileProvider&quot;
 android:authorities=&quot;${applicationId}.provider&quot;
 android:exported=&quot;false&quot;
 android:grantUriPermissions=&quot;true&quot;&gt;
 &lt;meta-data
 android:name=&quot;android.support.FILE_PROVIDER_PATHS&quot;
 android:resource=&quot;@xml/provider_paths&quot; /&gt;
 &lt;/provider&gt;
 ...
&lt;/application&gt;
</code></pre>
Add provider_paths.xml file to res/xml:
<pre><code>&lt;?xml version=&quot;1.0&quot; encoding=&quot;utf-8&quot;?&gt;
&lt;paths&gt;
 &lt;external-path name=&quot;external_files&quot; path=&quot;.&quot;/&gt;
&lt;/paths&gt;
</code></pre>
For android API level = 30, return from security settings does not work,
so used installation via browser:
<pre><code>try {
 val intent = Intent(Intent.ACTION_VIEW)
 intent.data = Uri.parse(&quot;https://path_to_file/application.apk&quot;)
 startActivity(intent)
 activity?.finish()
} catch (e: ActivityNotFoundException) { }
</code></pre>

Is possible to programmatically install a dynamically downloaded apk from a custom Android application.

Install Application programmatically on Android

Android

可以通过编程方式从自定义Android应用程序安装动态下载的apk。

问在Android上以编程方式安装应用程序
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