Implement takePicture function of Android Camera

In order to implement takePicture function of Android Camera, we have to implement ShutterCallback, PictureCallback for RAW and PictureCallback for JPG. To take picture, simple call camera.takePicture() method passing with the Callbacks.



Modify from the last exercise "Add a overlay on Camera Preview SurfaceView". Modify AndroidCamera.java

package com.exercise.AndroidCamera;

import java.io.IOException;

import android.app.Activity;
import android.content.pm.ActivityInfo;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.PixelFormat;
import android.hardware.Camera;
import android.hardware.Camera.PictureCallback;
import android.hardware.Camera.ShutterCallback;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.SurfaceHolder;
import android.view.SurfaceView;
import android.view.View;
import android.view.ViewGroup.LayoutParams;
import android.widget.Button;

public class AndroidCamera extends Activity implements SurfaceHolder.Callback{

Camera camera;
SurfaceView surfaceView;
SurfaceHolder surfaceHolder;
boolean previewing = false;
LayoutInflater controlInflater = null;

  /** Called when the activity is first created. */
  @Override
  public void onCreate(Bundle savedInstanceState) {
      super.onCreate(savedInstanceState);
      setContentView(R.layout.main);
      setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE);
    
      getWindow().setFormat(PixelFormat.UNKNOWN);
      surfaceView = (SurfaceView)findViewById(R.id.camerapreview);
      surfaceHolder = surfaceView.getHolder();
      surfaceHolder.addCallback(this);
      surfaceHolder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);
    
      controlInflater = LayoutInflater.from(getBaseContext());
      View viewControl = controlInflater.inflate(R.layout.control, null);
      LayoutParams layoutParamsControl
       = new LayoutParams(LayoutParams.FILL_PARENT,
       LayoutParams.FILL_PARENT);
      this.addContentView(viewControl, layoutParamsControl);
    
      Button buttonTakePicture = (Button)findViewById(R.id.takepicture);
      buttonTakePicture.setOnClickListener(new Button.OnClickListener(){

  @Override
  public void onClick(View arg0) {
   // TODO Auto-generated method stub
   camera.takePicture(myShutterCallback,
     myPictureCallback_RAW, myPictureCallback_JPG);
  }});
  }

  ShutterCallback myShutterCallback = new ShutterCallback(){

 @Override
 public void onShutter() {
  // TODO Auto-generated method stub
 
 }};

PictureCallback myPictureCallback_RAW = new PictureCallback(){

 @Override
 public void onPictureTaken(byte[] arg0, Camera arg1) {
  // TODO Auto-generated method stub
 
 }};

PictureCallback myPictureCallback_JPG = new PictureCallback(){

 @Override
 public void onPictureTaken(byte[] arg0, Camera arg1) {
  // TODO Auto-generated method stub
  Bitmap bitmapPicture
   = BitmapFactory.decodeByteArray(arg0, 0, arg0.length);
 }};

@Override
public void surfaceChanged(SurfaceHolder holder, int format, int width,
  int height) {
 // TODO Auto-generated method stub
 if(previewing){
  camera.stopPreview();
  previewing = false;
 }

 if (camera != null){
  try {
   camera.setPreviewDisplay(surfaceHolder);
   camera.startPreview();
   previewing = true;
  } catch (IOException e) {
   // TODO Auto-generated catch block
   e.printStackTrace();
  }
 }
}

@Override
public void surfaceCreated(SurfaceHolder holder) {
 // TODO Auto-generated method stub
 camera = Camera.open();
}

@Override
public void surfaceDestroyed(SurfaceHolder holder) {
 // TODO Auto-generated method stub
 camera.stopPreview();
 camera.release();
 camera = null;
 previewing = false;
}
}

Download the files.

next:
- Save the camera image using MediaStore