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Intent it = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
startActivityForResult(it, Activity.DEFAULT_KEYS_DIALER);

// Override the onActivityResult method
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
    if(requestCode == Activity.RESULT_OK){
        Bundle bundle = data.getExtras();
        Bitmap bitmap = (Bitmap) bundle.get("data");
        img_show.setImageBitmap(bitmap);
    }
}

// Define a File variable for saving the image
private File currentImageFile = null;

// Write these things at the button click event, which is to create an image file on the SD card:
@Override
public void onClick(View v) {
    File dir = new File(Environment.getExternalStorageDirectory(),"pictures");
    if(dir.exists()){
        dir.mkdirs();
    }
    currentImageFile = new File(dir,System.currentTimeMillis() + ".jpg");
    if(!currentImageFile.exists()){
        try {
            currentImageFile.createNewFile();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    Intent it = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
    it.putExtra(MediaStore.EXTRA_OUTPUT, Uri.fromFile(currentImageFile));
    startActivityForResult(it, Activity.DEFAULT_KEYS_DIALER);
}

//onActivityResult:
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
    if (requestCode == Activity.DEFAULT_KEYS_DIALER) {
        img_show.setImageURI(Uri.fromFile(currentImageFile));
    }
}

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical">

    <SurfaceView
        android:id="@+id/sfv_preview"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_weight="1" />

    <Button
        android:id="@+id/btn_take"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="Call System Camera" />

</LinearLayout>

public class MainActivity extends AppCompatActivity {

    private SurfaceView sfv_preview;
    private Button btn_take;
    private Camera camera = null;
    private SurfaceHolder.Callback cpHolderCallback = new SurfaceHolder.Callback() {
        @Override
        public void surfaceCreated(SurfaceHolder holder) {
            startPreview();
        }

        @Override
        public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) {

        }

        @Override
        public void surfaceDestroyed(SurfaceHolder holder) {
            stopPreview();
        }
    };

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

    private void bindViews() {
        sfv_preview = (SurfaceView) findViewById(R.id.sfv_preview);
        btn_take = (Button) findViewById(R.id.btn_take);
        sfv_preview.getHolder().addCallback(cpHolderCallback);

        btn_take.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                camera.takePicture(null, null, new Camera.PictureCallback() {
                    @Override
                    public void onPictureTaken(byte[] data, Camera camera) {
                        String path
```java
// Initialize the camera
camera = Camera.open();
try {
    camera.setPreviewDisplay(sfv_preview.getHolder());
    camera.setDisplayOrientation(90);   // Rotate the camera by 90 degrees
    camera.startPreview();
} catch (IOException e) {
    e.printStackTrace();
}

// Stop the preview
private void stopPreview() {
    camera.stopPreview();
    camera.release();
    camera = null;
}

}

/**
 * Created by Jay on 2015/11/22 0022.
 */
public class PreviewActivity extends AppCompatActivity {
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        ImageView img = new ImageView(this);
        String path = getIntent().getStringExtra("path");
        if(path != null){
            img.setImageURI(Uri.fromFile(new File(path)));
        }
        setContentView(img);
    }
}

<uses-permission android:name="android.permission.CAMERA"/>
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>