的Android MapController撞毀我的應用程序

我創建一個MapView的活動，由於某種原因，這個代碼不工作：的Android MapController撞毀我的應用程序

@Override 
public void onCreate(Bundle savedInstanceState){ 
    super.onCreate(savedInstanceState); 
    this.setContentView(R.layout.map_view); 
    MapView mapView = (MapView)this.findViewById(R.layout.map_view); 
    MapController mapController = mapView.getController();

此行特別是會導致應用崩潰：

MapController mapController = mapView.getController();

當我將該線路取出時，該應用的工作方式應該如此，但是當我將其放入時，它在啓動活動時崩潰，並顯示錯誤消息：

07-05 21:27:24.857: E/AndroidRuntime(23801): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.uie.top25.seattle/com.uie.top25.seattle.MapDetailActivity}: java.lang.NullPointerException

這是我的呼籲的MapView：

@Override 
protected void onCreate(Bundle savedInstanceState) 
{ 

    super.onCreate(savedInstanceState); 

    this.setContentView(R.layout.detail); 
    Bundle bundle = this.getIntent().getExtras(); 
    ListData listdata = bundle.getParcelable("uie.top25.seattle.listdata"); 

    // int itemId = this.getIntent().getIntExtra(DiningActivity.ITEM_ID, -1); 
    String itemTitle = listdata.getTitle(); 
    int itemNum = listdata.getItem(); 
    String sHead = listdata.getSubhead(); 
    String dText = listdata.getDetailText(); 
    final float latitude = listdata.getLatitude(); 
    final float longitude = listdata.getLongitude(); 
    Log.i(TAG, "Title that is set : " + itemTitle); 
    Log.i(TAG, "Item Number that is set : " + itemNum); 
    Log.i(TAG, "Latitude that is set : " + latitude); 
    Log.i(TAG, "Longitude that is set : " + longitude); 
    if (itemNum >= 0) 
    { 

     TextView tView = (TextView) this.findViewById(R.id.textTitle); 
     tView.setText(itemTitle); 
     TextView nView = (TextView) this.findViewById(R.id.itemNumber); 
     nView.setText("" + itemNum); 
     TextView subHead = (TextView) this.findViewById(R.id.textSubheader); 
     subHead.setText(sHead); 
     TextView details = (TextView) this.findViewById(R.id.itemDescription); 
     details.setText(dText); 
     ImageButton mapButton = (ImageButton) this.findViewById(R.id.mapButton); 
      mapButton.setOnClickListener(new View.OnClickListener() { 
          //this is where I call my mapView from 
       @Override 
       public void onClick(View v) 
       { 
        Intent mapIntent = new Intent(DetailActivity.this, MapDetailActivity.class); 
        //mapIntent.putExtra("uie.top25.seattle.listlat", latitude); 
        //mapIntent.putExtra("uie.top25.seattle.longitude", longitude); 

        startActivity(mapIntent); 

       } 
      }); 
    } 
}

}

誰能給我一些指導，以什麼我做錯了嗎？

來源

2012-07-06 BlackHatSamurai

你可以嘗試更換這行：

MapView mapView = (MapView)this.findViewById(R.layout.map_view);

與這一個：

MapView mapView = (MapView)this.findViewById(R.id.<your mapView Id>);

來源

2012-07-06 04:42:07

謝謝！我不敢相信我錯過了！ – BlackHatSamurai 2012-07-06 04:52:04

的問題是在這條線

MapView mapView = (MapView)this.findViewById(R.layout.map_view);

您林鼎佈局mapView不會得到初始化嘗試用ID來改變即

MapView mapView = (MapView)this.findViewById(R.id.map_view);

來源

2012-07-06 04:41:17

謝謝你的幫助！ – BlackHatSamurai 2012-07-06 04:52:16

的Android MapController撞毀我的應用程序

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