無法使用自動對焦拍攝照片

我已經搜索了一些解決方案，並確定存在許多與此相關的問題，但沒有解決我的問題。無法使用自動對焦拍攝照片

我收到運行時異常：takepicture failed:native_autofocus ..等等。

我試圖從相機使用自動對焦拍照，我似乎無法理解可能導致錯誤的原因。

這是我的代碼。

public class CameraPreview extends SurfaceView implements SurfaceHolder.Callback { 
    private SurfaceHolder mholder; 
    private Camera mcamera; 
    private Handler handler = new Handler(); 
    public CameraPreview(Context context, Camera camera) { 
     super(context); 
     this.mcamera = camera; 
     mholder = getHolder(); 
     mholder.addCallback(this); 
     mholder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS); 
    } 

    @Override 
    public void surfaceChanged(SurfaceHolder holder, int format, int width, 
      int height) { 
     if (mholder.getSurface() == null) { 
      return; 
     } 
     try { 
      mcamera.stopPreview(); 
     } catch (Exception e) { 
      Log.d("surfaceChanged", e.toString()); 
     } 
     try { 
      mcamera.setPreviewDisplay(holder); 
      mcamera.startPreview();   
     } catch (IOException e) { 
      Log.d("surfaceChanged--->surfaceCreated", e.toString()); 
     } 
    }

我覺得有些事情是缺乏在我運行的代碼，我想省略可運行和執行一次自動對焦，它去掉了運行時錯誤。我錯過了重新初始化這個部分的東西嗎？

private void autoFocus(Camera mcamera){ 
     final Camera cam=mcamera; 
     handler.postDelayed(new Runnable() {    
      @Override 
      public void run() {   
       cam.autoFocus(autoFocusCallback); 
       handler.postDelayed(this, 1500L);    
      } 
     }, 1500L); 
    } 
    AutoFocusCallback autoFocusCallback=new AutoFocusCallback() { 

     @Override 
     public void onAutoFocus(boolean success, Camera camera) { 
      camera.takePicture(null, null, mPicture); 
      } 
    }; 
    private PictureCallback mPicture=new PictureCallback() { 

     @Override 
     public void onPictureTaken(byte[] data, Camera camera) { 
      //do something 
     } 
    }; 

    @Override 
    public void surfaceCreated(SurfaceHolder holder) { 
     try { 
      mcamera.setPreviewDisplay(holder); 
      mcamera.startPreview(); 
      mcamera.autoFocus(autoFocusCallback); 
     } catch (IOException e) { 
      Log.d("surfaceCreated", e.toString()); 
     } 
    } 

    @Override 
    public void surfaceDestroyed(SurfaceHolder holder) { 

    } 
}

來源

2013-02-26 She Smile GM

請在您看到的錯誤上發佈更多詳細信息。從您的應用程序開始到失敗的日誌片段將是最好的。 – 2013-02-26 22:50:30