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anddev.org • View topic - Refresh the preview in autofocus or continuous autofocus

Refresh the preview in autofocus or continuous autofocus

All your problems with Audio, Video and Images.

Refresh the preview in autofocus or continuous autofocus

Postby el Salmón » Thu Jul 08, 2010 3:37 pm

Hi at all,

I would like to implement an image preview Activity that launch the autofocus when the user press some button and refresh the image on the screen. I don't need take a picture, just show the image preview in almost real-time because I just want to use the camera zoom to read text on the screen. Then I would like to implement a continuous autofocus (every 1 sec. or similar).

I'm basing on the code of this blog. Here it's my interesting code from my Image Preview Activity:
Code: Select all
@Override
   public void surfaceChanged(SurfaceHolder holder, int format, int w, int h) {

      if (mPreviewRunning) {
         mCamera.stopPreview();
      }

      Camera.Parameters p = mCamera.getParameters();

      // //////////////////////////////////////////////////////////
      // Check orientation and set size as w, h or h, w.
      Display display = ((WindowManager) getSystemService(WINDOW_SERVICE))
            .getDefaultDisplay();

      if (display.getOrientation() == ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE) {
         p.setPreviewSize(h, w);
      } else {
         p.setPreviewSize(w, h);
      }
       p.setAntibanding(Camera.Parameters.ANTIBANDING_AUTO);
      p.setFocusMode(Camera.Parameters.FOCUS_MODE_AUTO);
      setZoom(p);
      mCamera.setParameters(p);

      try {
         mCamera.setPreviewDisplay(holder);
      } catch (IOException e) {
         e.printStackTrace();
      }

      //start autofocus if it was-not started
      AutoFocusCallBackImpl autoFocusCallBack = new AutoFocusCallBackImpl();
      mCamera.autoFocus(autoFocusCallBack);
      //set the bIsAutoFocusStarted trigger to false to avoid extra autofocus attempts
      bIsAutoFocusStarted = true;

      mCamera.startPreview();
      mPreviewRunning = true;
   }


private class AutoFocusCallBackImpl implements Camera.AutoFocusCallback {
      @Override
      public void onAutoFocus(boolean success, Camera camera) {
         bIsAutoFocused = success; // update the flag used in onKeyDown()
         Log.i(TAG, "Inside autofocus callback. autofocused=" + success);
         // play the autofocus sound
         //MediaPlayer.create(Lupe.this, R.raw.auto_focos).start();
      }
   }

   @Override
   public boolean onKeyDown(int keyCode, KeyEvent event)
   {
      switch(keyCode){
      case KeyEvent.KEYCODE_DPAD_CENTER:
      case KeyEvent.KEYCODE_CAMERA:
      case KeyEvent.KEYCODE_DPAD_LEFT:
      case KeyEvent.KEYCODE_DPAD_RIGHT:
      case KeyEvent.KEYCODE_DPAD_DOWN:
      case KeyEvent.KEYCODE_DPAD_UP:
      case KeyEvent.KEYCODE_MENU:
         Log.i(TAG, "Autofocus assigned button pressed by the user");
         if (!bIsAutoFocusStarted) {
            Log.i(TAG, "Autofocus started");
            // start autofocus if it was-not started
            AutoFocusCallBackImpl autoFocusCallBack = new AutoFocusCallBackImpl();
            mCamera.autoFocus(autoFocusCallBack);
            // set the bIsAutoFocusStarted trigger to false to avoid extra
            // autofocus attempts
            bIsAutoFocusStarted = true;
            return true;
         }

      case KeyEvent.KEYCODE_BACK:
       //support for the BACK button to exit from activity
          return super.onKeyDown(keyCode, event);
      }
      
        return true;
   }


How to refresh the preview image when onAutoFocus is called?
el Salmón
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