MediaViewer的問題在列表視圖

我想播放聲音，當按鈕單擊時，我有不同的聲音，我列出的聲音與列表視圖，singlelistitem打開佈局時，我在列表視圖上選擇項目，我單擊單一列表佈局的按鈕，但當我點擊應用程序被關閉，它不工作，問題出在哪裏，謝謝MediaViewer的問題在列表視圖

AndroidListViewActivity.class（用於列表，選擇項）

SingleListItem.class（顯示所選項目）

按鈕點擊（在SingleListItem佈局上播放選定的聲音）

logcat的消息：

11-11 16:18:09.285: E/dalvikvm(17161): VM aborting 
11-11 16:18:09.285: A/libc(17161): Fatal signal 11 (SIGSEGV) at 0xdeadd00d (code=1)

AndroidListViewActivity類;

public class AndroidListViewActivity extends ListActivity { 
    int [] sounds; 
MediaPlayer mediaPlayer; 

@Override 
public void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
sounds= new int[] {R.raw.sound1,R.raw.sound2,R.raw.sound3,R.raw.sound4,R.raw.sound5};   

    // storing string resources into Array 
    String[] sounds= getResources().getStringArray(R.array.sounds);   
    // Binding Array to ListAdapter 
    this.setListAdapter(new ArrayAdapter<String>(this, R.layout.list_item, R.id.label, sounds)); 

    ListView lv = getListView(); 

    // listening to single list item on click 
    lv.setOnItemClickListener(new OnItemClickListener() { 
     public void onItemClick(AdapterView<?> parent, View view, 
      int position, long id) {  

      // selected item 
      String selectedsound= ((TextView) view).getText().toString(); 
      String selectedFromList = getItemAtPosition(position); 

      @SuppressWarnings("unused") 
      int resId = getResources().getIdentifier(selectedFromList, "raw", getPackageName()); 

    // Launching new Activity on selecting single List Item 
      Intent i = new Intent(getApplicationContext(), SingleListItem.class); 
      Intent intent = new Intent(getApplicationContext(), SingleListItem.class); 
      // sending data to new activity 
      i.putExtra("selectedsound", selectedsound); 
      intent.putExtra("position", position); 
      startActivity(i); 
      startActivity(intent);    
     } 

    private String getItemAtPosition(int position) { 
     // TODO Auto-generated method stub 
     return null; 
    } 
    }); 
} 
}

SingleListItem class;

public class SingleListItem extends Activity{ 

int [] sounds; 
MediaPlayer mediaPlayer; 

public void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 

    sounds= new int[] {R.raw.sound1,R.raw.sound2,R.raw.sound3,R.raw.sound4,R.raw.sound5}; 

      this.setContentView(R.layout.single_list_item_view); 

    TextView txtProduct = (TextView) findViewById(R.id.product_label); 

    Intent i = getIntent(); 

    Intent intent = getIntent(); 

    // getting attached intent data 
    String product = i.getStringExtra("selectedsound"); 

    int position = intent.getExtras().getInt("position"); 
    // displaying selected sound 
    txtProduct.setText(selectedsound); 
    mediaPlayer = MediaPlayer.create(this, sounds[position]); 
    Button b = (Button) findViewById(R.id.button1); 
    b.setOnClickListener(new View.OnClickListener(){ 

    public void onClick(View arg0) {        
    mediaPlayer.start(); 
    //start the progress dialog 
    } 
    }); 
}  
}

來源

2012-11-13 user201780

取出resId（您已經不使用它），因爲你正在傳遞一個Null它：

String selectedFromList = getItemAtPosition(position); 

int resId = getResources().getIdentifier(selectedFromList, "raw", getPackageName()); 

private String getItemAtPosition(int position) { 
    // TODO Auto-generated method stub 
    return null; 
}

來源

2012-11-13 09:34:29

MediaViewer的問題在列表視圖

回答

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