谷歌地圖片段異步任務完成後的片段更新/刷新

Question

public class TestActivity extends Activity implements OnMarkerClickListener{ 
    static LatLng HAMBURG = new LatLng(53.558, 9.927); 
    static LatLng KIEL = new LatLng(53.551, 9.993); 
    private GoogleMap map; 
    Marker hamburg, kiel; 


    @Override 
    protected void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.activity_test); 
    map = ((MapFragment) getFragmentManager().findFragmentById(R.id.map)) 
     .getMap(); 
    hamburg = map.addMarker(new MarkerOptions().position(HAMBURG).title("Hamburg")); 
    kiel = map.addMarker(new MarkerOptions().position(KIEL).title("Kiel")); 

    Polyline line = map.addPolyline(new PolylineOptions().add(HAMBURG,KIEL).width(5).color(Color.RED)); 

    // Move the camera instantly to hamburg with a zoom of 15. 
    map.moveCamera(CameraUpdateFactory.newLatLngZoom(HAMBURG, 15)); 

    // Zoom in, animating the camera. 
    map.animateCamera(CameraUpdateFactory.zoomTo(10), 2000, null); 


    AsyncTaskRunner runner = new AsyncTaskRunner();  
    runner.execute(); 
    } 



    @Override 
    public boolean onCreateOptionsMenu(Menu menu) { 
    getMenuInflater().inflate(R.menu.main, menu); 
    return true; 
    } 


    private class AsyncTaskRunner extends AsyncTask<String, String, String> { 

     String result;ProgressDialog pdia; 

     @Override 
     protected String doInBackground(String... params) { 
     publishProgress("Loading..."); // Calls onProgressUpdate() 
     TestActivity.HAMBURG = new LatLng(3.190393, 101.651317); 
     TestActivity.KIEL = new LatLng(3.148443,101.577099); 

     return result; 
     } 


     @Override 
     protected void onPostExecute(String result) { 

     pdia.dismiss(); 
     } 


     @Override 
     protected void onPreExecute() { 

      super.onPreExecute(); 
      pdia = ProgressDialog.show(TestActivity.this, "Please wait", "Loading data from database.", true, false);  
     } 


     @Override 
     protected void onProgressUpdate(String... text) { 

     } 
    } 
} 

我需要執行的是將標記（HAMBURG和KIEL）更改爲異步任務中設置的位置。同樣在listview中，我使用notifydatachanged（），在這種情況下應該怎麼做？

請擺脫一些光，並提前謝謝。

Answer 1

有沒有notifyDataChanged方法就像在ListView，你需要手動改變標記的位置。

首先，製作kiel和line級別的字段，如hamburg。然後，在您的AsyncTask的onPostExecute方法中，添加：

hamburg.setPosition(HAMBURG); 
kiel.setPosition(KIEL); 
line.setPoints(Arrays.asList(new LatLng[] { HAMBURG, KIEL }));