不播放声音和应用程序强制关闭

Question

在下面的代码应该工作，而不是播放声音时单击项目列表视图，应用程序崩溃，并强制关闭。 在你看来，我应该添加或从代码中删除什么？ 我有什么添加到list_item.xml？

这是我的代码：

public class soundTest extends Activity implements OnItemClickListener { 
    private ListView lv1; 
    private String lv_arr[]={"test 1","test 2","test 3","test 4","test 5"}; 

    @Override 
    public void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.main); 
    lv1=(ListView)findViewById(R.id.ListView01); 
    lv1.setAdapter(new ArrayAdapter<String>(this,R.layout.list_item, lv_arr)); 

    lv1.setOnItemClickListener(this); 
    } 
    @Override 
     public void onItemClick(AdapterView<?> parent, View view,int position, long id) { 

     if (lv1.getItemAtPosition(position)=="test 1") { 
      MediaPlayer mp = MediaPlayer.create(getApplicationContext(),R.raw.nadealikabir); 
      mp.start(); 
      mp.setOnCompletionListener(new OnCompletionListener() { 
      public void onCompletion(MediaPlayer mp) { 
       mp.release(); 
      } 
      }); 
     } 

     if (lv1.getItemAtPosition(position)=="test 2") { 
      MediaPlayer mp = MediaPlayer.create(getApplicationContext(),R.raw.karimi); 
      mp.start(); 
      mp.setOnCompletionListener(new OnCompletionListener() { 
      public void onCompletion(MediaPlayer mp) { 
       mp.release(); 
      } 
      }); 
     } 

} 
} 

和main.xml中：

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" 
xmlns:tools="http://schemas.android.com/tools" 
android:layout_width="match_parent" 
android:layout_height="match_parent" 
tools:context=".Main" > 
<ListView 
    android:id="@+id/ListView01" 
    android:layout_width="match_parent" 
    android:layout_height="wrap_content" 
    android:layout_centerHorizontal="true" 
    android:layout_centerVertical="true" > 
</ListView> 
</RelativeLayout> 

list_item.xml：

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" 
android:layout_width="match_parent" 
android:layout_height="match_parent" > 


</RelativeLayout> 

和我的logcat：

04-02 14:32:02.795: E/AndroidRuntime(1204): FATAL EXCEPTION: main 
04-02 14:32:02.795: E/AndroidRuntime(1204): java.lang.RuntimeException: Unable to instantiate activity ComponentInfo{com.example.soundlistview/com.example.soundlistview.Main}: java.lang.ClassNotFoundException: com.example.soundlistview.Main in loader dalvik.system.PathClassLoader[/data/app/com.example.soundlistview-2.apk] 
04-02 14:32:02.795: E/AndroidRuntime(1204):  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1569) 
04-02 14:32:02.795: E/AndroidRuntime(1204):  at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1663) 
04-02 14:32:02.795: E/AndroidRuntime(1204):  at android.app.ActivityThread.access$1500(ActivityThread.java:117) 
04-02 14:32:02.795: E/AndroidRuntime(1204):  at android.app.ActivityThread$H.handleMessage(ActivityThread.java:931) 
04-02 14:32:02.795: E/AndroidRuntime(1204):  at android.os.Handler.dispatchMessage(Handler.java:99) 
04-02 14:32:02.795: E/AndroidRuntime(1204):  at android.os.Looper.loop(Looper.java:130) 
04-02 14:32:02.795: E/AndroidRuntime(1204):  at android.app.ActivityThread.main(ActivityThread.java:3683) 
04-02 14:32:02.795: E/AndroidRuntime(1204):  at java.lang.reflect.Method.invokeNative(Native Method) 
04-02 14:32:02.795: E/AndroidRuntime(1204):  at java.lang.reflect.Method.invoke(Method.java:507) 
04-02 14:32:02.795: E/AndroidRuntime(1204):  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:839) 
04-02 14:32:02.795: E/AndroidRuntime(1204):  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:597) 
04-02 14:32:02.795: E/AndroidRuntime(1204):  at dalvik.system.NativeStart.main(Native Method) 
04-02 14:32:02.795: E/AndroidRuntime(1204): Caused by: java.lang.ClassNotFoundException: com.example.soundlistview.Main in loader dalvik.system.PathClassLoader[/data/app/com.example.soundlistview-2.apk] 
04-02 14:32:02.795: E/AndroidRuntime(1204):  at dalvik.system.PathClassLoader.findClass(PathClassLoader.java:240) 
04-02 14:32:02.795: E/AndroidRuntime(1204):  at java.lang.ClassLoader.loadClass(ClassLoader.java:551) 
04-02 14:32:02.795: E/AndroidRuntime(1204):  at java.lang.ClassLoader.loadClass(ClassLoader.java:511) 
04-02 14:32:02.795: E/AndroidRuntime(1204):  at android.app.Instrumentation.newActivity(Instrumentation.java:1021) 
04-02 14:32:02.795: E/AndroidRuntime(1204):  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1561) 
04-02 14:32:02.795: E/AndroidRuntime(1204):  ... 11 more 

Answer 1

试试这个..

变化，而不是==到.equels

if (lv1.getItemAtPosition(position).equels("test 1")) { 
     MediaPlayer mp = MediaPlayer.create(getApplicationContext(),R.raw.nadealikabir); 
     mp.start(); 
     mp.setOnCompletionListener(new OnCompletionListener() { 
     public void onCompletion(MediaPlayer mp) { 
      mp.release(); 
     } 
     }); 
    }