Android实现APP自动更新功能

砸漏

发布于 2020-11-05 15:23:24

9310

发布于 2020-11-05 15:23:24

文章被收录于专栏：恩蓝脚本

现在一般的android软件都是需要不断更新的，当你打开某个app的时候，如果有新的版本，它会提示你有新版本需要更新。该小程序实现的就是这个功能。

该小程序的特点是，当有更新时，会弹出一个提示框，点击确定，则在通知来创建一个进度条进行下载，点击取消，则取消更新。

以下是详细代码:

1.创建布局文件notification_item.xml，用于在通知栏生成一个进度条和下载图标。

<?xml version="1.0" encoding="utf-8"?  
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" 
 android:layout_width="fill_parent" 
 android:layout_height="fill_parent" 
 android:padding="3dp"   
 
 <ImageView 
  android:id="@+id/notificationImage" 
  android:layout_width="wrap_content" 
  android:layout_height="wrap_content" 
  android:src="@android:drawable/stat_sys_download" /  
 
 <TextView 
  android:id="@+id/notificationTitle" 
  android:layout_width="wrap_content" 
  android:layout_height="wrap_content" 
  android:layout_alignParentRight="true" 
  android:layout_toRightOf="@id/notificationImage" 
  android:paddingLeft="6dp" 
  android:textColor="#FF000000" /  
 
 <TextView 
  android:id="@+id/notificationPercent" 
  android:layout_width="wrap_content" 
  android:layout_height="wrap_content" 
  android:layout_below="@id/notificationImage" 
  android:paddingTop="2dp" 
  android:textColor="#FF000000" /  
 
 <ProgressBar 
  android:id="@+id/notificationProgress" 
  style="@style/ProgressBarHorizontal_color" 
  android:layout_width="wrap_content" 
  android:layout_height="wrap_content" 
  android:layout_alignLeft="@id/notificationTitle" 
  android:layout_alignParentRight="true" 
  android:layout_alignTop="@id/notificationPercent" 
  android:layout_below="@id/notificationTitle" 
  android:paddingLeft="6dp" 
  android:paddingRight="3dp" 
  android:paddingTop="2dp" /  
 
</RelativeLayout

2.创建AppContext类，该类继承自Application。

package com.test.application; 
 
import android.app.Application; 
import android.content.Context; 
 
import com.test.update.config.Config; 
 
public class AppContext extends Application { 
 private static AppContext appInstance; 
 private Context context; 
 
 public static AppContext getInstance() { 
  return appInstance; 
 } 
 
 @Override 
 public void onCreate() { 
  // TODO Auto-generated method stub 
  super.onCreate(); 
  appInstance = this; 
  context = this.getBaseContext(); 
//  // 获取当前版本号 
//  try { 
//   PackageInfo packageInfo = getApplicationContext() 
//     .getPackageManager().getPackageInfo(getPackageName(), 0); 
//   Config.localVersion = packageInfo.versionCode; 
//   Config.serverVersion = 1;// 假定服务器版本为2，本地版本默认是1 
//  } catch (NameNotFoundException e) { 
//   e.printStackTrace(); 
//  } 
  initGlobal(); 
 } 
 
 public void initGlobal() { 
  try { 
   Config.localVersion = getPackageManager().getPackageInfo( 
     getPackageName(), 0).versionCode; // 设置本地版本号 
   Config.serverVersion = 2;// 假定服务器版本为2，本地版本默认是1--实际开发中是从服务器获取最新版本号，android具体与后端的交互见我另///外的博文 
  } catch (Exception ex) { 
   ex.printStackTrace(); 
  } 
 } 
}

3.创建配置文件类Config.java,在这个类里面定义一些与版本相关的常量

package com.test.update.config; 
 
public class Config { 
 //版本信息 
 public static int localVersion = 0; 
 public static int serverVersion = 0; 
 /* 下载包安装路径 */ 
 public static final String savePath = "/sdcard/test/"; 
 
 public static final String saveFileName = savePath + "test.apk"; 
}

4.编写更新服务类UpdateServcie.java

package com.test.update; 
import java.io.File; 
import java.io.FileOutputStream; 
import java.io.InputStream; 
import java.net.HttpURLConnection; 
import java.net.URL; 
import android.annotation.SuppressLint; 
import android.app.Notification; 
import android.app.NotificationManager; 
import android.app.PendingIntent; 
import android.app.Service; 
import android.content.Intent; 
import android.net.Uri; 
import android.os.Environment; 
import android.os.Handler; 
import android.os.IBinder; 
import android.os.Message; 
import android.widget.RemoteViews; 
import com.test.update.config.Config; 
public class UpdateService extends Service { 
// 标题 
private int titleId = 0; 
// 文件存储 
private File updateDir = null; 
private File updateFile = null; 
// 下载状态 
private final static int DOWNLOAD_COMPLETE = 0; 
private final static int DOWNLOAD_FAIL = 1; 
// 通知栏 
private NotificationManager updateNotificationManager = null; 
private Notification updateNotification = null; 
// 通知栏跳转Intent 
private Intent updateIntent = null; 
private PendingIntent updatePendingIntent = null; 
/*** 
* 创建通知栏 
*/ 
RemoteViews contentView; 
// 这样的下载代码很多，我就不做过多的说明 
int downloadCount = 0; 
int currentSize = 0; 
long totalSize = 0; 
int updateTotalSize = 0; 
// 在onStartCommand()方法中准备相关的下载工作： 
@SuppressWarnings("deprecation") 
@Override 
public int onStartCommand(Intent intent, int flags, int startId) { 
// 获取传值 
titleId = intent.getIntExtra("titleId", 0); 
// 创建文件 
if (android.os.Environment.MEDIA_MOUNTED.equals(android.os.Environment 
.getExternalStorageState())) { 
updateDir = new File(Environment.getExternalStorageDirectory(), 
Config.saveFileName); 
updateFile = new File(updateDir.getPath(), getResources() 
.getString(titleId) + ".apk"); 
} 
this.updateNotificationManager = (NotificationManager) getSystemService(NOTIFICATION_SERVICE); 
this.updateNotification = new Notification(); 
// 设置下载过程中，点击通知栏，回到主界面 
updateIntent = new Intent(this, UpdateActivity.class); 
updatePendingIntent = PendingIntent.getActivity(this, 0, updateIntent, 
0); 
// 设置通知栏显示内容 
updateNotification.icon = R.drawable.ic_launcher; 
updateNotification.tickerText = "开始下载"; 
updateNotification.setLatestEventInfo(this, "QQ", "0%", 
updatePendingIntent); 
// 发出通知 
updateNotificationManager.notify(0, updateNotification); 
// 开启一个新的线程下载，如果使用Service同步下载，会导致ANR问题，Service本身也会阻塞 
new Thread(new updateRunnable()).start();// 这个是下载的重点，是下载的过程 
return super.onStartCommand(intent, flags, startId); 
} 
@Override 
public IBinder onBind(Intent arg0) { 
// TODO Auto-generated method stub 
return null; 
} 
@SuppressLint("HandlerLeak") 
private Handler updateHandler = new Handler() { 
@Override 
public void handleMessage(Message msg) { 
switch (msg.what) { 
case DOWNLOAD_COMPLETE: 
// 点击安装PendingIntent 
Uri uri = Uri.fromFile(updateFile); 
Intent installIntent = new Intent(Intent.ACTION_VIEW); 
installIntent.setDataAndType(uri, 
"application/vnd.android.package-archive"); 
updatePendingIntent = PendingIntent.getActivity( 
UpdateService.this, 0, installIntent, 0); 
updateNotification.defaults = Notification.DEFAULT_SOUND;// 铃声提醒 
updateNotification.setLatestEventInfo(UpdateService.this, 
"QQ", "下载完成,点击安装。", updatePendingIntent); 
updateNotificationManager.notify(0, updateNotification); 
// 停止服务 
stopService(updateIntent); 
case DOWNLOAD_FAIL: 
// 下载失败 
updateNotification.setLatestEventInfo(UpdateService.this, 
"QQ", "下载完成,点击安装。", updatePendingIntent); 
updateNotificationManager.notify(0, updateNotification); 
default: 
stopService(updateIntent); 
} 
} 
}; 
public long downloadUpdateFile(String downloadUrl, File saveFile) 
throws Exception { 
HttpURLConnection httpConnection = null; 
InputStream is = null; 
FileOutputStream fos = null; 
try { 
URL url = new URL(downloadUrl); 
httpConnection = (HttpURLConnection) url.openConnection(); 
httpConnection 
.setRequestProperty("User-Agent", "PacificHttpClient"); 
if (currentSize   0) { 
httpConnection.setRequestProperty("RANGE", "bytes=" 
+ currentSize + "-"); 
} 
httpConnection.setConnectTimeout(10000); 
httpConnection.setReadTimeout(20000); 
updateTotalSize = httpConnection.getContentLength(); 
if (httpConnection.getResponseCode() == 404) { 
throw new Exception("fail!"); 
} 
is = httpConnection.getInputStream(); 
fos = new FileOutputStream(saveFile, false); 
byte buffer[] = new byte[4096]; 
int readsize = 0; 
while ((readsize = is.read(buffer))   0) { 
fos.write(buffer, 0, readsize); 
totalSize += readsize; 
// 为了防止频繁的通知导致应用吃紧，百分比增加10才通知一次 
if ((downloadCount == 0) 
|| (int) (totalSize * 100 / updateTotalSize) - 10   downloadCount) { 
downloadCount += 10; 
updateNotification.setLatestEventInfo(UpdateService.this, 
"正在下载", (int) totalSize * 100 / updateTotalSize 
+ "%", updatePendingIntent); 
/*** 
* 在这里我们用自定的view来显示Notification 
*/ 
updateNotification.contentView = new RemoteViews( 
getPackageName(), R.layout.notification_item); 
updateNotification.contentView.setTextViewText( 
R.id.notificationTitle, "正在下载"); 
updateNotification.contentView.setProgressBar( 
R.id.notificationProgress, 100, downloadCount, false); 
updateNotificationManager.notify(0, updateNotification); 
} 
} 
} finally { 
if (httpConnection != null) { 
httpConnection.disconnect(); 
} 
if (is != null) { 
is.close(); 
} 
if (fos != null) { 
fos.close(); 
} 
} 
return totalSize; 
} 
class updateRunnable implements Runnable { 
Message message = updateHandler.obtainMessage(); 
public void run() { 
message.what = DOWNLOAD_COMPLETE; 
try { 
// 增加权限<USES-PERMISSION 
// android:name="android.permission.WRITE_EXTERNAL_STORAGE" ; 
if (!updateDir.exists()) { 
updateDir.mkdirs(); 
} 
if (!updateFile.exists()) { 
updateFile.createNewFile(); 
} 
// 下载函数，以QQ为例子 
// 增加权限<USES-PERMISSION 
// android:name="android.permission.INTERNET" ; 
long downloadSize = downloadUpdateFile( 
"http://softfile.3g.qq.com:8080/msoft/179/1105/10753/MobileQQ1.0(Android)_Build0198.apk", 
updateFile); 
if (downloadSize   0) { 
// 下载成功 
updateHandler.sendMessage(message); 
} 
} catch (Exception ex) { 
ex.printStackTrace(); 
message.what = DOWNLOAD_FAIL; 
// 下载失败 
updateHandler.sendMessage(message); 
} 
} 
} 
}

5.编写活动类UpdateActivity

package com.test.update; 
import com.test.update.config.Config; 
import android.support.v4.app.Fragment; 
import android.app.Activity; 
import android.app.AlertDialog; 
import android.content.DialogInterface; 
import android.content.Intent; 
import android.os.Bundle; 
import android.util.Log; 
import android.view.LayoutInflater; 
public class UpdateActivity extends Activity { 
@Override 
protected void onCreate(Bundle savedInstanceState) { 
super.onCreate(savedInstanceState); 
setContentView(R.layout.activity_main); 
checkVersion(); 
} 
/** 
* 检查更新版本 
*/ 
public void checkVersion() { 
if (Config.localVersion < Config.serverVersion) { 
Log.i("hgncxzy", "=============================="); 
// 发现新版本，提示用户更新 
AlertDialog.Builder alert = new AlertDialog.Builder(this); 
alert.setTitle("软件升级") 
.setMessage("发现新版本,建议立即更新使用.") 
.setPositiveButton("更新", 
new DialogInterface.OnClickListener() { 
public void onClick(DialogInterface dialog, 
int which) { 
// 开启更新服务UpdateService 
// 这里为了把update更好模块化，可以传一些updateService依赖的值 
// 如布局ID，资源ID，动态获取的标题,这里以app_name为例 
Intent updateIntent = new Intent( 
UpdateActivity.this, 
UpdateService.class); 
updateIntent.putExtra("titleId", 
R.string.app_name); 
startService(updateIntent); 
} 
}) 
.setNegativeButton("取消", 
new DialogInterface.OnClickListener() { 
public void onClick(DialogInterface dialog, 
int which) { 
dialog.dismiss(); 
} 
}); 
alert.create().show(); 
} else { 
// 清理工作，略去 
// cheanUpdateFile() 
} 
} 
}

6.添加权限以及将服务静态加载(在配置文件中加载)。

<uses-permission android:name="android.permission.INTERNET" /  
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" /  
<uses-permission android:name="android.permission.MOUNT_UNMOUNT_FILESYSTEMS" /

注册服务

<service android:name="com.test.update.UpdateService"   
</service

完整的AndroidManifest.xml文件如下:

<?xml version="1.0" encoding="utf-8"?  
<manifest xmlns:android="http://schemas.android.com/apk/res/android" 
package="com.test.update" 
android:versionCode="1" 
android:versionName="1.0"   
<uses-sdk 
android:minSdkVersion="8" 
android:targetSdkVersion="8" /  
<application 
android:name="com.test.application.AppContext" 
android:icon="@drawable/ic_launcher" 
android:label="@string/app_name"   
<activity 
android:name="com.test.update.UpdateActivity" 
android:label="@string/app_name"   
<intent-filter  
<action android:name="android.intent.action.MAIN" /  
<category android:name="android.intent.category.LAUNCHER" /  
</intent-filter  
</activity  
<service android:name="com.test.update.UpdateService"   
</service  
</application  
<uses-permission android:name="android.permission.INTERNET" /  
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" /  
<uses-permission android:name="android.permission.MOUNT_UNMOUNT_FILESYSTEMS" /  
</manifest

到此编码结束。

源码下载：Android实现APP自动更新功能

以上就是本文的全部内容，希望对大家的学习有所帮助。

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原始发表：2020-09-11 ，如有侵权请联系 cloudcommunity@tencent.com 删除

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