安卓：显示一个上下文菜单栏时，点击一个TextView

Question

我已经试过http://wptrafficanalyzer.in/blog/creating-a-contextual-menu-bar-contextual-action-mode-for-a-single-view-in-android/

与AndroidManifest.xml中：

<?xml version="1.0" encoding="utf-8"?> 
<manifest xmlns:android="http://schemas.android.com/apk/res/android" 
package="tvt.webviewdemo" 
android:versionCode="1" 
android:versionName="1.0" > 

<uses-sdk 
    android:minSdkVersion="8" 
    android:targetSdkVersion="19" /> 

<application 
    android:allowBackup="true" 
    android:icon="@drawable/ic_launcher" 
    android:label="@string/app_name" 
    android:theme="@style/AppTheme" > 
    <activity 
     android:name="tvt.webviewdemo.MainActivity" 
     android:label="@string/app_name" > 
     <intent-filter> 
      <action android:name="android.intent.action.MAIN" /> 

      <category android:name="android.intent.category.LAUNCHER" /> 
     </intent-filter> 
    </activity> 
</application> 
<uses-permission android:name="android.permission.INTERNET"/> 
</manifest> 

但我有一个错误：java.lang.NoClassDefFoundError：

public void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.main); 

    TextView tvHello = (TextView) findViewById(R.id.tv_hello); 

    mCallback = new ActionMode.Callback() { // error line <<<<< 

     /** 
     * Invoked whenever the action mode is shown. This is invoked 
     * immediately after onCreateActionMode 
     */ 
     @Override 
     public boolean onPrepareActionMode(ActionMode mode, Menu menu) { 
      return false; 
     } 

     /** Called when user exits action mode */ 
     @Override 
     public void onDestroyActionMode(ActionMode mode) { 
      mMode = null; 
     } 

     /** 
     * This is called when the action mode is created. This is called by 
     * startActionMode() 
     */ 
     @Override 
     public boolean onCreateActionMode(ActionMode mode, Menu menu) { 
      mode.setTitle("Demo"); 
      getMenuInflater().inflate(R.menu.context_menu, menu); 
      return true; 
     } 

     /** This is called when an item in the context menu is selected */ 
     @Override 
     public boolean onActionItemClicked(ActionMode mode, MenuItem item) { 
      switch (item.getItemId()) { 
      case R.id.action1: 
       Toast.makeText(getBaseContext(), "Selected Action1 ", 
         Toast.LENGTH_LONG).show(); 
       mode.finish(); // Automatically exists the action mode, when 
           // the user selects this action 
       break; 
      case R.id.action2: 
       Toast.makeText(getBaseContext(), "Selected Action2 ", 
         Toast.LENGTH_LONG).show(); 
       break; 
      case R.id.action3: 
       Toast.makeText(getBaseContext(), "Selected Action3 ", 
         Toast.LENGTH_LONG).show(); 
       break; 
      } 
      return false; 
     } 
    }; 

    OnLongClickListener listener = new OnLongClickListener() { 

     @Override 
     public boolean onLongClick(View v) { 
      if (mMode != null) 
       return false; 
      else 
       mMode = startActionMode(mCallback); 
      return true; 
     } 
    }; 

    tvHello.setOnLongClickListener(listener); 

} 

编辑 - 错误日志：

04-11 20:45:24.600: E/AndroidRuntime(348): FATAL EXCEPTION: main 
04-11 20:45:24.600: E/AndroidRuntime(348): java.lang.NoClassDefFoundError: tvt.webviewdemo.MainActivity$1 
04-11 20:45:24.600: E/AndroidRuntime(348): at tvt.webviewdemo.MainActivity.onCreate(MainActivity.java:28) 
04-11 20:45:24.600: E/AndroidRuntime(348): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047) 
04-11 20:45:24.600: E/AndroidRuntime(348): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1611) 
04-11 20:45:24.600: E/AndroidRuntime(348): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1663) 
04-11 20:45:24.600: E/AndroidRuntime(348): at android.app.ActivityThread.access$1500(ActivityThread.java:117) 
04-11 20:45:24.600: E/AndroidRuntime(348): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:931) 
04-11 20:45:24.600: E/AndroidRuntime(348): at android.os.Handler.dispatchMessage(Handler.java:99) 
04-11 20:45:24.600: E/AndroidRuntime(348): at android.os.Looper.loop(Looper.java:123) 
04-11 20:45:24.600: E/AndroidRuntime(348): at android.app.ActivityThread.main(ActivityThread.java:3683) 
04-11 20:45:24.600: E/AndroidRuntime(348): at java.lang.reflect.Method.invokeNative(Native Method) 
04-11 20:45:24.600: E/AndroidRuntime(348): at java.lang.reflect.Method.invoke(Method.java:507) 
04-11 20:45:24.600: E/AndroidRuntime(348): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:839) 
04-11 20:45:24.600: E/AndroidRuntime(348): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:597) 
04-11 20:45:24.600: E/AndroidRuntime(348): at dalvik.system.NativeStart.main(Native Method) 

如何解决问题？

谢谢！

Answer 1

我认为这是在里面onCreateActionMode()膨胀情境布局的错误：

getMenuInflater().inflate(R.menu.context_menu, menu); 

应该使用ActionMode对象被夸大：

mode.getMenuInflater().inflate(R.menu.contextual_menu, menu);