Android How to - Take a picture and preview

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The following code shows how to Take a picture and preview.

Example

Register permission for camera.

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.java2s.myapplication3.app" >
    <uses-sdk
        android:minSdkVersion="8"
        android:targetSdkVersion="18" />
    <uses-permission android:name="android.permission.CAMERA"></uses-permission>
    <application
        android:allowBackup="true"
        android:icon="@drawable/ic_launcher"
        android:label="java2s.com"
        android:theme="@style/AppTheme" >
        <activity
            android:name="com.java2s.myapplication3.app.MainActivity"
            android:label="java2s.com"
            >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
    </application>

</manifest>

Main layout xml file

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
  android:orientation="vertical"
  android:layout_width="fill_parent"
  android:layout_height="fill_parent">
  <SurfaceView
    android:id="@+id/preview"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
  />
  <RelativeLayout
    android:layout_width="fill_parent"
    android:layout_height="100dip"
    android:layout_alignParentBottom="true"
    android:gravity="center_vertical"
    android:background="#A000">
    <Button
      android:layout_width="100dip"
      android:layout_height="wrap_content"
      android:text="Cancel"
      android:onClick="onCancelClick"
    />
    <Button
      android:layout_width="100dip"
      android:layout_height="wrap_content"
      android:layout_alignParentRight="true"
      android:text="Snap Photo"
      android:onClick="onSnapClick"
    />
  </RelativeLayout>
</RelativeLayout>

Main activity Java code

package com.java2s.myapplication3.app;
/*from  w w w  . j a va 2s.  c  o  m*/
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.util.List;

import android.app.Activity;
import android.hardware.Camera;
import android.os.Bundle;
import android.util.Log;
import android.view.SurfaceHolder;
import android.view.SurfaceView;
import android.view.View;
import android.widget.Toast;


public class MainActivity extends Activity implements SurfaceHolder.Callback, Camera.ShutterCallback, Camera.PictureCallback {

    Camera mCamera;
    SurfaceView mPreview;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        mPreview = (SurfaceView)findViewById(R.id.preview);
        mPreview.getHolder().addCallback(this);
        mPreview.getHolder().setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);

        mCamera = Camera.open();
    }

    @Override
    public void onPause() {
        super.onPause();
        mCamera.stopPreview();
    }

    @Override
    public void onDestroy() {
        super.onDestroy();
        mCamera.release();
        Log.d("CAMERA","Destroy");
    }

    public void onCancelClick(View v) {
        finish();
    }

    public void onSnapClick(View v) {
        mCamera.takePicture(this, null, null, this);
    }
    @Override
    public void onShutter() {
        Toast.makeText(this, "Click!", Toast.LENGTH_SHORT).show();
    }

    @Override
    public void onPictureTaken(byte[] data, Camera camera) {
        try {
            FileOutputStream out = openFileOutput("picture.jpg", Activity.MODE_PRIVATE);
            out.write(data);
            out.flush();
            out.close();
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }

        //Must restart preview
        camera.startPreview();
    }

    @Override
    public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) {
        Camera.Parameters params = mCamera.getParameters();
        List<Camera.Size> sizes = params.getSupportedPreviewSizes();
        Camera.Size selected = sizes.get(0);
        params.setPreviewSize(selected.width,selected.height);
        mCamera.setParameters(params);

        mCamera.setDisplayOrientation(90);
        mCamera.startPreview();
    }

    @Override
    public void surfaceCreated(SurfaceHolder holder) {
        try {
            mCamera.setPreviewDisplay(mPreview.getHolder());
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    @Override
    public void surfaceDestroyed(SurfaceHolder holder) {
        Log.i("PREVIEW","surfaceDestroyed");
    }
}

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