Android Open Source - sensor-supervisor Camera Preview

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License

The source code is released under:

GNU General Public License

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Java Source Code

package com.thirdi.sensorsupervisor;
/*from  w  ww  . j  a v a  2 s . c  o m*/
import java.io.IOException;

import android.content.Context;
import android.hardware.Camera;
import android.util.Log;
import android.view.Surface;
import android.view.SurfaceHolder;
import android.view.SurfaceView;

public class CameraPreview extends SurfaceView implements SurfaceHolder.Callback{
  private SurfaceHolder mHolder;
    private Camera mCamera;
    private String TAG = "CameraExample";
    protected static boolean SHOW_CAMERA = true;
    private SurfaceView view = new SurfaceView(getContext());
    
    public CameraPreview(Context context, Camera camera) {
        super(context);
        mCamera = camera;

        // Install a SurfaceHolder.Callback so we get notified when the underlying surface is created and destroyed.
        mHolder = getHolder();
        mHolder.addCallback(this);
    }

    public void surfaceCreated(SurfaceHolder holder) {
        // Surface has been created, now tell the camera where to draw the preview.
        try {
          if (SHOW_CAMERA) {
            mCamera.setPreviewDisplay(holder);
          } else {
            mCamera.setPreviewDisplay(view.getHolder());
          }
            mCamera.startPreview();
        } catch (IOException e) {
            Log.d(TAG, "Error setting camera preview: " + e.getMessage());
        }
    }

    public void surfaceDestroyed(SurfaceHolder holder) {
        // empty. Take care of releasing the Camera preview in your activity.
    }

    public void surfaceChanged(SurfaceHolder holder, int format, int w, int h) {
        // If your preview can change or rotate, take care of those events here.
        // Make sure to stop the preview before resizing or reformatting it.

        if (mHolder.getSurface() == null){
            // preview surface does not exist
            return;
        }

        // stop preview before making changes
        try {
            mCamera.stopPreview();
        } catch (Exception e){
            // ignore: tried to stop a non-existent preview
        }

        // set preview size and make any resize, rotate or
        // reformatting changes here

        // start preview with new settings
        try {
          if (SHOW_CAMERA) {
            mCamera.setPreviewDisplay(holder);
          } else {
            mCamera.setPreviewDisplay(view.getHolder());
          }
            mCamera.startPreview();

        } catch (Exception e){
            Log.d(TAG, "Error starting camera preview: " + e.getMessage());
        }
    }
    
    public Surface getSurface() {
      return mHolder.getSurface();
    }
}

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