blocks|key|419400|text|当您在Activity类内部调用时，getAssets()方法将会工作。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|419401|如果在非Activity类中调用此方法，则需要从Activity类传递的上下文中调用此方法。下面是你可以访问该方法的代码行。|419402|ContextInstance.getAssets();|code-block|syntax|javascript|419403|ContextInstance可以作为Activity类的this传递。|419404|entityMap^0|I|B|0|0|0|0|F|0^^$0|@$1|2|3|4|5|6|7|Q|8|@$9|R|A|S|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|T|8|@]|D|@]|E|$]]|$1|H|3|I|5|J|7|U|8|@]|D|@]|E|$K|L]]|$1|M|3|N|5|6|7|V|8|@$9|W|A|X|B|C]]|D|@]|E|$]]|$1|O|3|-4|5|6|7|Y|8|@]|D|@]|E|$]]]|P|$]]

<code>getAssets()</code> method will work when you are calling inside the Activity class.

If you calling this method in non-Activity class then you need to call this method from Context which is passed from Activity class. So below is the line by you can access the method.

<pre><code>ContextInstance.getAssets();
</code></pre>

<code>ContextInstance</code> may be passed as this of Activity class.

blocks|key|419408|text|AssetManager+assetManager+=+getAssets();
InputStream+inputStream+=+null;
try+{
++++inputStream+=+assetManager.open("helloworld.txt");
}
catch+(IOException+e){
++++Log.e("message:+",e.getMessage());
}|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|419409|unstyled|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|G|8|@]|9|@]|A|$B|C]]|$1|D|3|-4|5|E|7|H|8|@]|9|@]|A|$]]]|F|$]]

<pre><code>AssetManager assetManager = getAssets();
InputStream inputStream = null;
try {
 inputStream = assetManager.open("helloworld.txt");
}
catch (IOException e){
 Log.e("message: ",e.getMessage());
}
</code></pre>

blocks|key|634235|text|public+String+ReadFromfile(String+fileName,+Context+context)+{
++++StringBuilder+returnString+=+new+StringBuilder();
++++InputStream+fIn+=+null;
++++InputStreamReader+isr+=+null;
++++BufferedReader+input+=+null;
++++try+{
++++++++fIn+=+context.getResources().getAssets()
++++++++++++++++.open(fileName,+Context.MODE_WORLD_READABLE);
++++++++isr+=+new+InputStreamReader(fIn);
++++++++input+=+new+BufferedReader(isr);
++++++++String+line+=+"";
++++++++while+((line+=+input.readLine())+!=+null)+{
++++++++++++returnString.append(line);
++++++++}
++++}+catch+(Exception+e)+{
++++++++e.getMessage();
++++}+finally+{
++++++++try+{
++++++++++++if+(isr+!=+null)
++++++++++++++++isr.close();
++++++++++++if+(fIn+!=+null)
++++++++++++++++fIn.close();
++++++++++++if+(input+!=+null)
++++++++++++++++input.close();
++++++++}+catch+(Exception+e2)+{
++++++++++++e2.getMessage();
++++++++}
++++}
++++return+returnString.toString();
}|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|634236|unstyled|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|G|8|@]|9|@]|A|$B|C]]|$1|D|3|-4|5|E|7|H|8|@]|9|@]|A|$]]]|F|$]]

<pre><code>public String ReadFromfile(String fileName, Context context) {
 StringBuilder returnString = new StringBuilder();
 InputStream fIn = null;
 InputStreamReader isr = null;
 BufferedReader input = null;
 try {
 fIn = context.getResources().getAssets()
 .open(fileName, Context.MODE_WORLD_READABLE);
 isr = new InputStreamReader(fIn);
 input = new BufferedReader(isr);
 String line = "";
 while ((line = input.readLine()) != null) {
 returnString.append(line);
 }
 } catch (Exception e) {
 e.getMessage();
 } finally {
 try {
 if (isr != null)
 isr.close();
 if (fIn != null)
 fIn.close();
 if (input != null)
 input.close();
 } catch (Exception e2) {
 e2.getMessage();
 }
 }
 return returnString.toString();
}
</code></pre>

blocks|key|419447|text|以下是读取assets中的文件的方法：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|419448|/**
+*+Reads+the+text+of+an+asset.+Should+not+be+run+on+the+UI+thread.
+*+
+*+@param+mgr
+*++++++++++++The+{@link+AssetManager}+obtained+via+{@link+Context#getAssets()}
+*+@param+path
+*++++++++++++The+path+to+the+asset.
+*+@return+The+plain+text+of+the+asset
+*/
public+static+String+readAsset(AssetManager+mgr,+String+path)+{
++++String+contents+=+"";
++++InputStream+is+=+null;
++++BufferedReader+reader+=+null;
++++try+{
++++++++is+=+mgr.open(path);
++++++++reader+=+new+BufferedReader(new+InputStreamReader(is));
++++++++contents+=+reader.readLine();
++++++++String+line+=+null;
++++++++while+((line+=+reader.readLine())+!=+null)+{
++++++++++++contents+%2B=+'\n'+%2B+line;
++++++++}
++++}+catch+(final+Exception+e)+{
++++++++e.printStackTrace();
++++}+finally+{
++++++++if+(is+!=+null)+{
++++++++++++try+{
++++++++++++++++is.close();
++++++++++++}+catch+(IOException+ignored)+{
++++++++++++}
++++++++}
++++++++if+(reader+!=+null)+{
++++++++++++try+{
++++++++++++++++reader.close();
++++++++++++}+catch+(IOException+ignored)+{
++++++++++++}
++++++++}
++++}
++++return+contents;
}|code-block|syntax|javascript|419449|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|$]]

Here is a method to read a file in assets:

<pre><code>/**
 * Reads the text of an asset. Should not be run on the UI thread.
 * 
 * @param mgr
 * The {@link AssetManager} obtained via {@link Context#getAssets()}
 * @param path
 * The path to the asset.
 * @return The plain text of the asset
 */
public static String readAsset(AssetManager mgr, String path) {
 String contents = "";
 InputStream is = null;
 BufferedReader reader = null;
 try {
 is = mgr.open(path);
 reader = new BufferedReader(new InputStreamReader(is));
 contents = reader.readLine();
 String line = null;
 while ((line = reader.readLine()) != null) {
 contents += '\n' + line;
 }
 } catch (final Exception e) {
 e.printStackTrace();
 } finally {
 if (is != null) {
 try {
 is.close();
 } catch (IOException ignored) {
 }
 }
 if (reader != null) {
 try {
 reader.close();
 } catch (IOException ignored) {
 }
 }
 }
 return contents;
}
</code></pre>

blocks|key|419497|text|如果您使用除Activity之外其他任何类，您可能希望这样做，|type|unstyled|depth|inlineStyleRanges|entityRanges|data|419498|BufferedReader+bufferedReader+=+new+BufferedReader(new+InputStreamReader(+YourApplication.getInstance().getAssets().open("text.txt"),+"UTF-8"));|code-block|syntax|javascript|419499|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|$]]

If you use other any class other than Activity, you might want to do like,

<pre><code>BufferedReader bufferedReader = new BufferedReader(new InputStreamReader( YourApplication.getInstance().getAssets().open("text.txt"), "UTF-8"));
</code></pre>

blocks|key|634435|text|在MainActivity.java中|type|unstyled|depth|inlineStyleRanges|entityRanges|data|634436|@Override
++++protected+void+onCreate(Bundle+savedInstanceState)+{
++++++++super.onCreate(savedInstanceState);
++++++++setContentView(R.layout.activity_main);

++++++++TextView+tvView+=+(TextView)+findViewById(R.id.tvView);

++++++++AssetsReader+assetsReader+=+new+AssetsReader(this);
++++++++if(assetsReader.getTxtFile(your_file_title))+!=+null)
++++++++{
++++++++++++tvView.setText(assetsReader.getTxtFile(your_file_title)));
++++++++}
++++}|code-block|syntax|javascript|634437|此外，您还可以创建单独的类来完成所有工作|634438|public+class+AssetsReader+implements+Readable{

++++private+static+final+String+TAG+=+"AssetsReader";


++++private+AssetManager+mAssetManager;
++++private+Activity+mActivity;

++++public+AssetsReader(Activity+activity)+{
++++++++this.mActivity+=+activity;
++++++++mAssetManager+=+mActivity.getAssets();
++++}

++++@Override
++++public+String+getTxtFile(String+fileName)
++++{
++++++++BufferedReader+reader+=+null;
++++++++InputStream+inputStream+=+null;
++++++++StringBuilder+builder+=+new+StringBuilder();

++++++++try{
++++++++++++inputStream+=+mAssetManager.open(fileName);
++++++++++++reader+=+new+BufferedReader(new+InputStreamReader(inputStream));

++++++++++++String+line;

++++++++++++while((line+=+reader.readLine())+!=+null)
++++++++++++{
++++++++++++++++Log.i(TAG,+line);
++++++++++++++++builder.append(line);
++++++++++++++++builder.append("\n");
++++++++++++}
++++++++}+catch+(IOException+ioe){
++++++++++++ioe.printStackTrace();
++++++++}+finally+{

++++++++++++if(inputStream+!=+null)
++++++++++++{
++++++++++++++++try+{
++++++++++++++++++++inputStream.close();
++++++++++++++++}+catch+(IOException+ioe){
++++++++++++++++++++ioe.printStackTrace();
++++++++++++++++}
++++++++++++}

++++++++++++if(reader+!=+null)
++++++++++++{
++++++++++++++++try+{
++++++++++++++++++++reader.close();
++++++++++++++++}+catch+(IOException+ioe)
++++++++++++++++{
++++++++++++++++++++ioe.printStackTrace();
++++++++++++++++}
++++++++++++}
++++++++}
++++++++Log.i(TAG,+"builder.toString():+"+%2B+builder.toString());
++++++++return+builder.toString();
++++}
}|634439|在我看来，最好是创建一个接口，但这不是必须的|634440|public+interface+Readable+{
++++/**
+++++*+Reads+txt+file+from+assets
+++++*+@param+fileName
+++++*+@return+string
+++++*/
++++String+getTxtFile(String+fileName);
}|634441|entityMap^0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|Q|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|R|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|S|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|T|8|@]|9|@]|A|$E|F]]|$1|K|3|L|5|6|7|U|8|@]|9|@]|A|$]]|$1|M|3|N|5|D|7|V|8|@]|9|@]|A|$E|F]]|$1|O|3|-4|5|6|7|W|8|@]|9|@]|A|$]]]|P|$]]

In MainActivity.java

<pre><code>@Override
 protected void onCreate(Bundle savedInstanceState) {
 super.onCreate(savedInstanceState);
 setContentView(R.layout.activity_main);

 TextView tvView = (TextView) findViewById(R.id.tvView);

 AssetsReader assetsReader = new AssetsReader(this);
 if(assetsReader.getTxtFile(your_file_title)) != null)
 {
 tvView.setText(assetsReader.getTxtFile(your_file_title)));
 }
 }
</code></pre>

Also, you can create separate class that does all the work

<pre><code>public class AssetsReader implements Readable{

 private static final String TAG = "AssetsReader";


 private AssetManager mAssetManager;
 private Activity mActivity;

 public AssetsReader(Activity activity) {
 this.mActivity = activity;
 mAssetManager = mActivity.getAssets();
 }

 @Override
 public String getTxtFile(String fileName)
 {
 BufferedReader reader = null;
 InputStream inputStream = null;
 StringBuilder builder = new StringBuilder();

 try{
 inputStream = mAssetManager.open(fileName);
 reader = new BufferedReader(new InputStreamReader(inputStream));

 String line;

 while((line = reader.readLine()) != null)
 {
 Log.i(TAG, line);
 builder.append(line);
 builder.append("\n");
 }
 } catch (IOException ioe){
 ioe.printStackTrace();
 } finally {

 if(inputStream != null)
 {
 try {
 inputStream.close();
 } catch (IOException ioe){
 ioe.printStackTrace();
 }
 }

 if(reader != null)
 {
 try {
 reader.close();
 } catch (IOException ioe)
 {
 ioe.printStackTrace();
 }
 }
 }
 Log.i(TAG, "builder.toString(): " + builder.toString());
 return builder.toString();
 }
}
</code></pre>

In my opinion it's better to create an interface, but it's not neccessary 

<pre><code>public interface Readable {
 /**
 * Reads txt file from assets
 * @param fileName
 * @return string
 */
 String getTxtFile(String fileName);
}
</code></pre>

blocks|key|419893|text|cityfile.txt|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|419894|+++public+void+getCityStateFromLocal()+{
++++++++AssetManager+am+=+getAssets();
++++++++InputStream+inputStream+=+null;
++++++++try+{
++++++++++++inputStream+=+am.open("city_state.txt");
++++++++}+catch+(IOException+e)+{
++++++++++++e.printStackTrace();
++++++++}
++++++++ObjectMapper+mapper+=+new+ObjectMapper();
++++++++Map<String,+String[]>+map+=+new+HashMap<String,+String[]>();
++++++++try+{
++++++++++++map+=+mapper.readValue(getStringFromInputStream(inputStream),+new+TypeReference<Map<String,+String[]>>()+{
++++++++++++});
++++++++}+catch+(IOException+e)+{
++++++++++++e.printStackTrace();
++++++++}
++++++++ConstantValues.arrayListStateName.clear();
++++++++ConstantValues.arrayListCityByState.clear();
++++++++if+(map.size()+>+0)
++++++++{
++++++++++++for+(Map.Entry<String,+String[]>+e+:+map.entrySet())+{
++++++++++++++++CityByState+cityByState+=+new+CityByState();
++++++++++++++++String+key+=+e.getKey();
++++++++++++++++String[]+value+=+e.getValue();
++++++++++++++++ArrayList<String>+s+=+new+ArrayList<String>(Arrays.asList(value));
++++++++++++++++ConstantValues.arrayListStateName.add(key);
++++++++++++++++s.add(0,"Select+City");
++++++++++++++++cityByState.addValue(s);
++++++++++++++++ConstantValues.arrayListCityByState.add(cityByState);
++++++++++++}
++++++++}
++++++++ConstantValues.arrayListStateName.add(0,"Select+States");
++++}
+//+Convert+InputStream+to+String
++++public+String+getStringFromInputStream(InputStream+is)+{
++++++++BufferedReader+br+=+null;
++++++++StringBuilder+sb+=+new+StringBuilder();
++++++++String+line;
++++++++try+{
++++++++++++br+=+new+BufferedReader(new+InputStreamReader(is));
++++++++++++while+((line+=+br.readLine())+!=+null)+{
++++++++++++++++sb.append(line);
++++++++++++}
++++++++}+catch+(IOException+e)+{
++++++++++++e.printStackTrace();
++++++++}+finally+{
++++++++++++if+(br+!=+null)+{
++++++++++++++++try+{
++++++++++++++++++++br.close();
++++++++++++++++}+catch+(IOException+e)+{
++++++++++++++++++++e.printStackTrace();
++++++++++++++++}
++++++++++++}
++++++++}

++++++++return+sb+%2B+"";

++++}|code-block|syntax|javascript|419895|entityMap|0|LINK|mutability|MUTABLE|url|https://ufile.io/qsvox^0|0|C|0|0|0^^$0|@$1|2|3|4|5|6|7|Q|8|@]|9|@$A|R|B|S|1|T]]|C|$]]|$1|D|3|E|5|F|7|U|8|@]|9|@]|C|$G|H]]|$1|I|3|-4|5|6|7|V|8|@]|9|@]|C|$]]]|J|$K|$5|L|M|N|C|$O|P]]]]

<a href="https://ufile.io/qsvox" rel="nofollow noreferrer">cityfile.txt</a>

<pre><code> public void getCityStateFromLocal() {
 AssetManager am = getAssets();
 InputStream inputStream = null;
 try {
 inputStream = am.open("city_state.txt");
 } catch (IOException e) {
 e.printStackTrace();
 }
 ObjectMapper mapper = new ObjectMapper();
 Map&lt;String, String[]&gt; map = new HashMap&lt;String, String[]&gt;();
 try {
 map = mapper.readValue(getStringFromInputStream(inputStream), new TypeReference&lt;Map&lt;String, String[]&gt;&gt;() {
 });
 } catch (IOException e) {
 e.printStackTrace();
 }
 ConstantValues.arrayListStateName.clear();
 ConstantValues.arrayListCityByState.clear();
 if (map.size() &gt; 0)
 {
 for (Map.Entry&lt;String, String[]&gt; e : map.entrySet()) {
 CityByState cityByState = new CityByState();
 String key = e.getKey();
 String[] value = e.getValue();
 ArrayList&lt;String&gt; s = new ArrayList&lt;String&gt;(Arrays.asList(value));
 ConstantValues.arrayListStateName.add(key);
 s.add(0,"Select City");
 cityByState.addValue(s);
 ConstantValues.arrayListCityByState.add(cityByState);
 }
 }
 ConstantValues.arrayListStateName.add(0,"Select States");
 }
 // Convert InputStream to String
 public String getStringFromInputStream(InputStream is) {
 BufferedReader br = null;
 StringBuilder sb = new StringBuilder();
 String line;
 try {
 br = new BufferedReader(new InputStreamReader(is));
 while ((line = br.readLine()) != null) {
 sb.append(line);
 }
 } catch (IOException e) {
 e.printStackTrace();
 } finally {
 if (br != null) {
 try {
 br.close();
 } catch (IOException e) {
 e.printStackTrace();
 }
 }
 }

 return sb + "";

 }
</code></pre>

blocks|key|634515|text|您可以从文件中加载内容。考虑到文件存在于资源文件夹中。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|634516|public+static+InputStream+loadInputStreamFromAssetFile(Context+context,+String+fileName){
++++AssetManager+am+=+context.getAssets();
++++try+{
++++++++InputStream+is+=+am.open(fileName);
++++++++return+is;
++++}+catch+(IOException+e)+{
++++++++e.printStackTrace();
++++}
++++return+null;
}

public+static+String+loadContentFromFile(Context+context,+String+path){
++++String+content+=+null;
++++try+{
++++++++InputStream+is+=+loadInputStreamFromAssetFile(context,+path);
++++++++int+size+=+is.available();
++++++++byte[]+buffer+=+new+byte[size];
++++++++is.read(buffer);
++++++++is.close();
++++++++content+=+new+String(buffer,+"UTF-8");
++++}+catch+(IOException+ex)+{
++++++++ex.printStackTrace();
++++++++return+null;
++++}
++++return+content;
}|code-block|syntax|javascript|634517|现在，您可以通过调用如下函数来获取内容|634518|String+json=+FileUtil.loadContentFromFile(context,+"data.json");|634519|考虑到data.json存储在Application\app\src\main\assets\data.json中|634520|entityMap^0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|O|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|P|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|Q|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|R|8|@]|9|@]|A|$E|F]]|$1|K|3|L|5|6|7|S|8|@]|9|@]|A|$]]|$1|M|3|-4|5|6|7|T|8|@]|9|@]|A|$]]]|N|$]]

You can load the content from the file. Consider the file is present in asset folder.

<pre><code>public static InputStream loadInputStreamFromAssetFile(Context context, String fileName){
 AssetManager am = context.getAssets();
 try {
 InputStream is = am.open(fileName);
 return is;
 } catch (IOException e) {
 e.printStackTrace();
 }
 return null;
}

public static String loadContentFromFile(Context context, String path){
 String content = null;
 try {
 InputStream is = loadInputStreamFromAssetFile(context, path);
 int size = is.available();
 byte[] buffer = new byte[size];
 is.read(buffer);
 is.close();
 content = new String(buffer, "UTF-8");
 } catch (IOException ex) {
 ex.printStackTrace();
 return null;
 }
 return content;
}
</code></pre>

Now you can get the content by calling the function as follow

<pre><code>String json= FileUtil.loadContentFromFile(context, "data.json");
</code></pre>

Considering the data.json is stored at Application\app\src\main\assets\data.json

blocks|key|419995|text|使用Kotlin，您可以执行以下操作从Android中的资源读取文件：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|419996|try+{
++++val+inputStream:InputStream+=+assets.open("helloworld.txt")
++++val+inputString+=+inputStream.bufferedReader().use{it.readText()}
++++Log.d(TAG,inputString)
}+catch+(e:Exception){
++++Log.d(TAG,+e.toString())
}|code-block|syntax|javascript|419997|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|$]]

Using Kotlin, you can do the following to read a file from assets in Android:

<pre><code>try {
 val inputStream:InputStream = assets.open("helloworld.txt")
 val inputString = inputStream.bufferedReader().use{it.readText()}
 Log.d(TAG,inputString)
} catch (e:Exception){
 Log.d(TAG, e.toString())
}
</code></pre>

blocks|key|634625|text|读取和写入文件总是冗长且容易出错。避免这些答案，只需使用Okio：|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|634626|public+void+readLines(File+file)+throws+IOException+{
++try+(BufferedSource+source+=+Okio.buffer(Okio.source(file)))+{
++++for+(String+line;+(line+=+source.readUtf8Line())+!=+null;+)+{
++++++if+(line.contains("square"))+{
++++++++System.out.println(line);
++++++}
++++}
++}
}|code-block|syntax|javascript|634627|entityMap|0|LINK|mutability|MUTABLE|url|http://github.com/square/okio^0|S|4|0|0|0^^$0|@$1|2|3|4|5|6|7|Q|8|@]|9|@$A|R|B|S|1|T]]|C|$]]|$1|D|3|E|5|F|7|U|8|@]|9|@]|C|$G|H]]|$1|I|3|-4|5|6|7|V|8|@]|9|@]|C|$]]]|J|$K|$5|L|M|N|C|$O|P]]]]

Reading and writing files have always been verbose and error-prone. Avoid these answers and just use <a href="http://github.com/square/okio" rel="nofollow noreferrer">Okio</a> instead:

<pre class="lang-java prettyprint-override"><code>public void readLines(File file) throws IOException {
 try (BufferedSource source = Okio.buffer(Okio.source(file))) {
 for (String line; (line = source.readUtf8Line()) != null; ) {
 if (line.contains("square")) {
 System.out.println(line);
 }
 }
 }
}
</code></pre>

blocks|key|420096|text|kotlin的一行解决方案：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|420097|fun+readFileText(fileName:+String):+String+{
++++return+assets.open(fileName).bufferedReader().use+{+it.readText()+}
}|code-block|syntax|javascript|420098|您还可以将其用作扩展函数everyWhere|420099|fun+Context.readTextFromAsset(fileName+:+String)+:+String{
+++++return+assets.open(fileName).bufferedReader().use+{+
+++++it.readText()}
}|420100|只需在任何上下文类中调用|420101|context.readTextFromAsset("my+file+name")|420102|entityMap^0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|Q|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|R|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|S|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|T|8|@]|9|@]|A|$E|F]]|$1|K|3|L|5|6|7|U|8|@]|9|@]|A|$]]|$1|M|3|N|5|D|7|V|8|@]|9|@]|A|$E|F]]|$1|O|3|-4|5|6|7|W|8|@]|9|@]|A|$]]]|P|$]]

one line solution for kotlin:
<pre><code>fun readFileText(fileName: String): String {
 return assets.open(fileName).bufferedReader().use { it.readText() }
}
</code></pre>
Also you can use it as extension function everyWhere
<pre><code>fun Context.readTextFromAsset(fileName : String) : String{
 return assets.open(fileName).bufferedReader().use { 
 it.readText()}
}
</code></pre>
Simply call in any context Class
<pre><code>context.readTextFromAsset(&quot;my file name&quot;)
</code></pre>

blocks|key|420139|text|@HpTerm+answer+Kotlin版本：|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|420140|private+fun+Activity(getDataFromAssets:+Activity)：String+{|420141|++++var+bufferedReader:+BufferedReader?+=+null
++++var+data+=+""

++++try+{
++++++++bufferedReader+=+BufferedReader(
++++++++++++InputStreamReader(
++++++++++++++++activity?.assets?.open("Your_FILE.html"),
++++++++++++++++"UTF-8"
++++++++++++)
++++++++)++++++++++++++++++//use+assets?+directly+if+in+activity

++++++++var+mLine:String?+=+bufferedReader.readLine()
++++++++while+(mLine+!=+null)+{
++++++++++++data%2B=+mLine
++++++++++++mLine=bufferedReader.readLine()
++++++++}

++++}+catch+(e:+Exception)+{
++++++++e.printStackTrace()
++++}+finally+{
++++++++try+{
++++++++++++bufferedReader?.close()
++++++++}+catch+(e:+Exception)+{
++++++++++++e.printStackTrace()
++++++++}
++++}
++++return+data
}|code-block|syntax|javascript|420142|entityMap|0|LINK|mutability|MUTABLE|url|https://stackoverflow.com/a/9544781/6478047^0|0|7|0|0|0|0^^$0|@$1|2|3|4|5|6|7|S|8|@]|9|@$A|T|B|U|1|V]]|C|$]]|$1|D|3|E|5|6|7|W|8|@]|9|@]|C|$]]|$1|F|3|G|5|H|7|X|8|@]|9|@]|C|$I|J]]|$1|K|3|-4|5|6|7|Y|8|@]|9|@]|C|$]]]|L|$M|$5|N|O|P|C|$Q|R]]]]

<a href="https://stackoverflow.com/a/9544781/6478047">@HpTerm</a> answer Kotlin version:
private fun getDataFromAssets(activity: Activity): String {
<pre><code> var bufferedReader: BufferedReader? = null
 var data = &quot;&quot;

 try {
 bufferedReader = BufferedReader(
 InputStreamReader(
 activity?.assets?.open(&quot;Your_FILE.html&quot;),
 &quot;UTF-8&quot;
 )
 ) //use assets? directly if in activity

 var mLine:String? = bufferedReader.readLine()
 while (mLine != null) {
 data+= mLine
 mLine=bufferedReader.readLine()
 }

 } catch (e: Exception) {
 e.printStackTrace()
 } finally {
 try {
 bufferedReader?.close()
 } catch (e: Exception) {
 e.printStackTrace()
 }
 }
 return data
}
</code></pre>

blocks|key|634754|text|Scanner类可以简化这一过程。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|634755|++++++++StringBuilder+sb=new+StringBuilder();
++++++++Scanner+scanner=null;
++++++++try+{
++++++++++++scanner=new+Scanner(getAssets().open("text.txt"));
++++++++++++while(scanner.hasNextLine()){
++++++++++++++++sb.append(scanner.nextLine());
++++++++++++++++sb.append('\n');
++++++++++++}
++++++++}+catch+(IOException+e)+{
++++++++++++e.printStackTrace();
++++++++}finally+{
++++++++++++if(scanner!=null){try{scanner.close();}catch+(Exception+e){}}
++++++++}
++++++++mTextView.setText(sb.toString());|code-block|syntax|javascript|634756|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|$]]

The Scanner class may simplify this.

<pre><code> StringBuilder sb=new StringBuilder();
 Scanner scanner=null;
 try {
 scanner=new Scanner(getAssets().open("text.txt"));
 while(scanner.hasNextLine()){
 sb.append(scanner.nextLine());
 sb.append('\n');
 }
 } catch (IOException e) {
 e.printStackTrace();
 }finally {
 if(scanner!=null){try{scanner.close();}catch (Exception e){}}
 }
 mTextView.setText(sb.toString());
</code></pre>

blocks|key|634801|text|也许为时已晚，但为了其他寻找桃子答案的人：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|634802|public+static+String+loadAssetFile(Context+context,+String+fileName)+{
++++try+{
++++++++BufferedReader+bufferedReader+=+new+BufferedReader(new+InputStreamReader(context.getAssets().open(fileName)));
++++++++StringBuilder+out=+new+StringBuilder();
++++++++String+eachline+=+bufferedReader.readLine();
++++++++while+(eachline+!=+null)+{
++++++++++++out.append(eachline);
++++++++++++eachline+=+bufferedReader.readLine();
++++++++}
++++++++return+out.toString();
++++}+catch+(IOException+e)+{
++++++++Log.e("Load+Asset+File",e.toString());
++++}
++++return+null;
}|code-block|syntax|javascript|634803|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|$]]

It maybe too late but for the sake of others who look for the peachy answers :

<pre><code>public static String loadAssetFile(Context context, String fileName) {
 try {
 BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(context.getAssets().open(fileName)));
 StringBuilder out= new StringBuilder();
 String eachline = bufferedReader.readLine();
 while (eachline != null) {
 out.append(eachline);
 eachline = bufferedReader.readLine();
 }
 return out.toString();
 } catch (IOException e) {
 Log.e("Load Asset File",e.toString());
 }
 return null;
}
</code></pre>

<pre><code>public class Utils {
 public static List&lt;Message&gt; getMessages() {
 //File file = new File("file:///android_asset/helloworld.txt");
 AssetManager assetManager = getAssets();
 InputStream ims = assetManager.open("helloworld.txt"); 
 }
}
</code></pre>

I am using this code trying to read a file from assets. I tried two ways to do this. First, when use <code>File</code> I received <code>FileNotFoundException</code>, when using <code>AssetManager getAssets()</code> method isn't recognized. 
Is there any solution here?

read file from assets

Android

Kotlin

public class Utils { public static List<Message> getMessages() { //File file = new File("file:///android_asset/helloworld.txt"); AssetManager a...

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