как взять и сохранить фотографии в фрагменте, не используя намерения?

Question

привет Я пытаюсь сделать снимок и сохранить эту фотографию в фрагменте. мой пользователь должен нажать кнопку, сделать снимок и сохранить его, мой предварительный просмотр камеры в моем фрагменте, поэтому я думал, что все это должно произойти и в фрагменте, поэтому я попытался привнести кнопки в фрагмент, но я получил NullPointerException, поэтому я попытался получить растровое изображение и отправить его в действие с помощью [this]: Passing data between a fragment and its container activity, но он дает мне исключение класса и я не знаю, что делать. помните, что я хочу взять и сохранить изображение, любая помощь будет wonderful.thanks вот мой код в фрагменте камеры:

public class CameraFragment extends Fragment { 
private Preview mPreview; 
Camera mCamera; 
int mNumberOfCameras; 
    // The first rear facing camera 
    int mDefaultCameraId; 
    @Override 
    public void onCreate(Bundle savedInstanceState) { 
     Log.d("aron", "we are in oncreate"); 
     super.onCreate(savedInstanceState); 
     // Create a container that will hold a SurfaceView for camera previews 
     mPreview = new Preview(this.getActivity()); 
     Log.d("aron", "we are in oncreate and we made preview successfuly"); 
    } 
    public interface OnDataPass { 
     public void onDataPass(Bitmap data); 
    } 
    OnDataPass dataPasser; 

    @Override 
    public void onAttach(Activity a) { 
     super.onAttach(a); 
     Log.d("aron", "we are in onattach"); 
     dataPasser = (OnDataPass) a; 
    } 
    public void passData() { 
     Bitmap data=mPreview.getBitmap(); 
     Log.d("aron", "we are in passdata"); 
     dataPasser.onDataPass(data); 
    } 
    @Override 
    public void onActivityCreated(Bundle savedInstanceState) { 
     super.onActivityCreated(savedInstanceState); 
     // Add an up arrow to the "home" button, indicating that the button will go "up" 
     // one activity in the app's Activity heirarchy. 
     // Calls to getActionBar() aren't guaranteed to return the ActionBar when called 
     // from within the Fragment's onCreate method, because the Window's decor hasn't been 
     // initialized yet. Either call for the ActionBar reference in Activity.onCreate() 
     // (after the setContentView(...) call), or in the Fragment's onActivityCreated method. 
     /* Activity activity = this.getActivity(); 
     ActionBar actionBar = activity.getActionBar(); 
     actionBar.setDisplayHomeAsUpEnabled(true);*/ 
     Log.d("aron", "we are in onactivitycreated and we are done with it"); 
    } 
    @Override 
    public View onCreateView(LayoutInflater inflater, ViewGroup container, 
      Bundle savedInstanceState) { 
     Log.d("aron", "we are in oncreateview"); 
     return mPreview; 
    } 
    @Override 
    public void onResume() { 
     super.onResume(); 
     // Use mCurrentCamera to select the camera desired to safely restore 
     // the fragment after the camera has been changed 
     mCamera = Camera.open(); 
     mPreview.setCamera(mCamera); 
     Log.d("aron", "we are in onresume"); 
    } 
    @Override 
    public void onPause() { 
     super.onPause(); 
     // Because the Camera object is a shared resource, it's very 
     // important to release it when the activity is paused. 
     if (mCamera != null) { 
      mPreview.setCamera(null); 
      mCamera.release(); 
      mCamera = null; 
     } 
     Log.d("aron", "we are in onpause"); 
    } 
    /* @Override 
    public void onCreateOptionsMenu(Menu menu, MenuInflater inflater) { 
     if (mNumberOfCameras > 1) { 
      // Inflate our menu which can gather user input for switching camera 
      inflater.inflate(R.menu.main, menu); 
     } else { 
      super.onCreateOptionsMenu(menu, inflater); 
     } 
    } 
    @Override 
    public boolean onOptionsItemSelected(MenuItem item) { 
     // Handle item selection 
     switch (item.getItemId()) { 
     case R.id.menu_switch_cam: 
      // Release this camera -> mCameraCurrentlyLocked 
      if (mCamera != null) { 
       mCamera.stopPreview(); 
       mPreview.setCamera(null); 
       mCamera.release(); 
       mCamera = null; 
      } 
      // Acquire the next camera and request Preview to reconfigure 
      // parameters. 
      mCurrentCamera = (mCameraCurrentlyLocked + 1) % mNumberOfCameras; 
      mCamera = Camera.open(mCurrentCamera); 
      mCameraCurrentlyLocked = mCurrentCamera; 
      mPreview.switchCamera(mCamera); 
      // Start the preview 
      mCamera.startPreview(); 
      return true; 
     case android.R.id.home: 
      Intent intent = new Intent(this.getActivity(), MainActivity.class); 
      intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP|Intent.FLAG_ACTIVITY_SINGLE_TOP); 
      startActivity(intent); 
      return true; 
     default: 
      return super.onOptionsItemSelected(item); 
     } 
    }*/ 
} 
// ---------------------------------------------------------------------- 
/** 
* A simple wrapper around a Camera and a SurfaceView that renders a centered 
* preview of the Camera to the surface. We need to center the SurfaceView 
* because not all devices have cameras that support preview sizes at the same 
* aspect ratio as the device's display. 
*/ 
class Preview extends ViewGroup implements SurfaceHolder.Callback { 
    private final String TAG = "Preview"; 
    SurfaceView mSurfaceView; 
    SurfaceHolder mHolder; 
    Bitmap cameraBitmap; 
    Size mPreviewSize; 
    List<Size> mSupportedPreviewSizes; 
    Camera mCamera; 
    boolean mSurfaceCreated = false; 
    Preview(Context context) { 
     super(context); 
     mSurfaceView = new SurfaceView(context); 
     addView(mSurfaceView); 
     // Install a SurfaceHolder.Callback so we get notified when the 
     // underlying surface is created and destroyed. 
     mHolder = mSurfaceView.getHolder(); 
     mHolder.addCallback(this); 
    } 
    public void setCamera(Camera camera) { 
     mCamera = camera; 
     if (mCamera != null) { 
      mSupportedPreviewSizes = mCamera.getParameters() 
        .getSupportedPreviewSizes(); 
      if (mSurfaceCreated) requestLayout(); 
     } 
    } 
    public void switchCamera(Camera camera) { 
     setCamera(camera); 
     try { 
      camera.setPreviewDisplay(mHolder); 
     } catch (IOException exception) { 
      Log.e(TAG, "IOException caused by setPreviewDisplay()", exception); 
     } 
    } 
    @Override 
    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) { 
     // We purposely disregard child measurements because act as a 
     // wrapper to a SurfaceView that centers the camera preview instead 
     // of stretching it. 
     final int width = resolveSize(getSuggestedMinimumWidth(), 
       widthMeasureSpec); 
     final int height = resolveSize(getSuggestedMinimumHeight(), 
       heightMeasureSpec); 
     setMeasuredDimension(width, height); 
     if (mSupportedPreviewSizes != null) { 
      mPreviewSize = getOptimalPreviewSize(mSupportedPreviewSizes, width, 
        height); 
     } 
     if (mCamera != null) { 
      Camera.Parameters parameters = mCamera.getParameters(); 
      parameters.setPreviewSize(mPreviewSize.width, mPreviewSize.height); 
      mCamera.setParameters(parameters); 
     } 
    } 
    @Override 
    protected void onLayout(boolean changed, int l, int t, int r, int b) { 
     if (getChildCount() > 0) { 
      final View child = getChildAt(0); 
      final int width = r - l; 
      final int height = b - t; 
      int previewWidth = width; 
      int previewHeight = height; 
      if (mPreviewSize != null) { 
       previewWidth = mPreviewSize.width; 
       previewHeight = mPreviewSize.height; 
      } 
      // Center the child SurfaceView within the parent. 
      if (width * previewHeight > height * previewWidth) { 
       final int scaledChildWidth = previewWidth * height 
         /previewHeight; 
       child.layout((width - scaledChildWidth)/2, 0, 
         (width + scaledChildWidth)/2, height); 
      } else { 
       final int scaledChildHeight = previewHeight * width 
         /previewWidth; 
       child.layout(0, (height - scaledChildHeight)/2, width, 
         (height + scaledChildHeight)/2); 
      } 
     } 
    } 
    public void surfaceCreated(SurfaceHolder holder) { 
     // The Surface has been created, acquire the camera and tell it where 
     // to draw. 
     try { 
      if (mCamera != null) { 
       mCamera.setPreviewDisplay(holder); 
      } 
     } catch (IOException exception) { 
      Log.e(TAG, "IOException caused by setPreviewDisplay()", exception); 
     } 
     if (mPreviewSize == null) requestLayout(); 
     mSurfaceCreated = true; 
    } 
    public void surfaceDestroyed(SurfaceHolder holder) { 
     // Surface will be destroyed when we return, so stop the preview. 
     if (mCamera != null) { 
      mCamera.stopPreview(); 
     } 
    } 
    private Size getOptimalPreviewSize(List<Size> sizes, int w, int h) { 
     final double ASPECT_TOLERANCE = 0.1; 
     double targetRatio = (double) w/h; 
     if (sizes == null) 
      return null; 
     Size optimalSize = null; 
     double minDiff = Double.MAX_VALUE; 
     int targetHeight = h; 
     // Try to find an size match aspect ratio and size 
     for (Size size : sizes) { 
      double ratio = (double) size.width/size.height; 
      if (Math.abs(ratio - targetRatio) > ASPECT_TOLERANCE) 
       continue; 
      if (Math.abs(size.height - targetHeight) < minDiff) { 
       optimalSize = size; 
       minDiff = Math.abs(size.height - targetHeight); 
      } 
     } 
     // Cannot find the one match the aspect ratio, ignore the requirement 
     if (optimalSize == null) { 
      minDiff = Double.MAX_VALUE; 
      for (Size size : sizes) { 
       if (Math.abs(size.height - targetHeight) < minDiff) { 
        optimalSize = size; 
        minDiff = Math.abs(size.height - targetHeight); 
       } 
      } 
     } 
     return optimalSize; 
    } 
    public void surfaceChanged(SurfaceHolder holder, int format, int w, int h) { 
     // Now that the size is known, set up the camera parameters and begin 
     // the preview. 
     Camera.Parameters parameters = mCamera.getParameters(); 
     parameters.setPreviewSize(mPreviewSize.width, mPreviewSize.height); 
     requestLayout(); 
     Log.d("aron", "we are in surface changed"); 
     mCamera.setParameters(parameters); 
     mCamera.startPreview(); 
    } 
    public Bitmap getBitmap(){ 
     @SuppressWarnings("unused") 
     PictureCallback pic=new PictureCallback() { 
      @Override 
      public void onPictureTaken(byte[] data, Camera arg1) { 
       Log.d("aron", "onPicturetaken"); 
       cameraBitmap = BitmapFactory.decodeByteArray(data, 0, data.length); 
      } 
     }; 
     return cameraBitmap; 
    } 
} 

он говорит ClassCastException, когда в

dataPasser = (OnDataPass) a;

Обратите внимание, что я не хочу использовать намерение из-за других частей моего проекта. , пожалуйста, помогите мне !!!

и это мой хозяин активность:

public class MainActivity extends Activity { 

@Override 
protected void onCreate(Bundle savedInstanceState) { 
    this.setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_PORTRAIT); 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.activity_main); 
    ImageButton capturebtn=(ImageButton)findViewById(R.id.capturebtn); 
    Log.d("aron", "Image button is created"); 
    capturebtn.setOnClickListener(new OnClickListener() { 
     @Override 
     public void onClick(View view) { 
      @SuppressWarnings("unused") 
      OnDataPass bitmapPasser=new OnDataPass() { 
       @Override 
       public void onDataPass(Bitmap cameraBitmap) { 
        Log.d("aron","we are in act on click and in datapass got bitmap"); 
        int wid = cameraBitmap.getWidth(); 
        int hgt = cameraBitmap.getHeight(); 
        Bitmap newImage = Bitmap.createBitmap(wid, hgt, Bitmap.Config.ARGB_8888); 
        Canvas canvas = new Canvas(newImage); 
        canvas.drawBitmap(cameraBitmap, 0f, 0f, null); 
        Log.d("aron","bitmap and canvas are made"); 
        FrameLayout frm = (FrameLayout)findViewById(R.id.frameLayout1); 
        frm.setDrawingCacheEnabled(true); 
        frm.buildDrawingCache(); 
        Bitmap bitmap = frm.getDrawingCache(); 
        canvas.drawBitmap(bitmap, 0f, 0f, null); 
        Log.d("aron","framelayout dorost shod"); 
       } 
      }; 
     } 
    }); 
} 
} 

, как вы можете видеть, я реализовал OnDataPass.

Answer 1

так через некоторое время я решил это сам смысл в том, что могли бы использовать

Camera.PictureCallback

и я сделать это now.like:

@Override 
public void onActivityCreated(Bundle savedInstanceState) { 
    super.onActivityCreated(savedInstanceState); 
    View myActivityView=(RelativeLayout)getActivity().findViewById(R.id.parentContainer); 
    ImageButton capturebtn=(ImageButton)myActivityView.findViewById(R.id.capturebtn); 
    capturebtn.setOnClickListener(new View.OnClickListener() { 
     @SuppressWarnings("UnusedDeclaration") 
     @Override 
     public void onClick(View v) { 
      Log.d("aron", "this is in fragment and this is a damned button say halelooya"); 
      mPreview.TakePicture(); 
     } 
    }); 
} 

как вы можно увидеть в фрагменте в onActivity, я назвал родительскую активность фрагмента и назвал метод для съемки.