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/**
 * Created by Jay on 2015/10/15 0015.
 */
public class MyView extends View {

    private Paint mPaint;  // The Path for drawing lines
    private Path mPath;      // Record the user's Path
    private Canvas mCanvas;  // The Canvas created in memory
    private Bitmap mBitmap;  // Cache the content of the drawing

    private int mLastX;
    private int mLastY;

    public MyView(Context context) {
        super(context);
        init();
    }

    public MyView(Context context, AttributeSet attrs) {
        super(context, attrs);
        init();
    }

    public MyView(Context context, AttributeSet attrs, int defStyleAttr) {
        super(context, attrs, defStyleAttr);
        init();
    }

    private void init() {
        mPath = new Path();
        mPaint = new Paint();   // Initialize the brush
        mPaint.setColor(Color.GREEN);
        mPaint.setAntiAlias(true);
        mPaint.setDither(true);
        mPaint.setStyle(Paint.Style.STROKE);
        mPaint.setStrokeJoin(Paint.Join.ROUND); // The joint is rounded
        mPaint.setStrokeCap(Paint.Cap.ROUND); // Set the turning point to be rounded
        mPaint.setStrokeWidth(20);   // Set the brush width
    }

    @Override
    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
        super.onMeasure(widthMeasureSpec, heightMeasureSpec);
        int width = getMeasuredWidth();
        int height = getMeasuredHeight();
        // Initialize bitmap, Canvas
        mBitmap = Bitmap.createBitmap(width, height, Bitmap.Config.ARGB_8888);
        mCanvas = new Canvas(mBitmap);
    }

    // Override this method to draw here
    @Override
    protected void onDraw(Canvas canvas) {
        drawPath();
        canvas.drawBitmap(mBitmap, 0, 0, null);
    }

    // Draw the line
    private void drawPath() {
        mCanvas.drawPath(mPath, mPaint);
    }

    @Override
    public boolean onTouchEvent(MotionEvent event) {

        int action = event.getAction();
        int x = (int) event.getX();
        int y = (int) event.getY();

        switch (action) {
            case MotionEvent.ACTION_DOWN:
                mLastX = x;
                mLastY = y;
                mPath.moveTo(mLastX
ImageView imgMezi = new ImageView(mContext);
imgMezi.setImageResource(mData[position]); //Create an ImageView
imgMezi.setScaleType(ImageView.ScaleType.FIT_XY); //Set the scaling type of the ImageView
imgMezi.setLayoutParams(new Gallery.LayoutParams(250, 250)); //Set layout parameters for the ImageView
TypedArray typedArray = mContext.obtainStyledAttributes(R.styleable.Gallery);
imgMezi.setBackgroundResource(typedArray.getResourceId(R.styleable.Gallery_android_galleryItemBackground, 0));
return imgMezi;
}
}

Finally, in our Activity, it's quite simple, just setting the onSelected event for the gallery, and after clicking the button, passing the current selected Position to the next page!

**MainActivity.java** :

```java
public class MainActivity extends AppCompatActivity implements AdapterView.OnItemSelectedListener,
        View.OnClickListener {

    private Context mContext;
    private ImageView img_choose;
    private Button btn_choose;
    private Gallery gay_choose;
    private int index = 0;
    private MeiziAdapter mAdapter = null;
    private int[] imageIds = new int[]
            {
                    R.mipmap.pre1, R.mipmap.pre2, R.mipmap.pre3, R.mipmap.pre4,
                    R.mipmap.pre5, R.mipmap.pre6, R.mipmap.pre7, R.mipmap.pre8,
                    R.mipmap.pre9, R.mipmap.pre10, R.mipmap.pre11, R.mipmap.pre12,
                    R.mipmap.pre13, R.mipmap.pre14, R.mipmap.pre15, R.mipmap.pre16,
                    R.mipmap.pre17, R.mipmap.pre18, R.mipmap.pre19, R.mipmap.pre20,
                    R.mipmap.pre21
            };

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

    private void bindViews() {
        img_choose = (ImageView) findViewById(R.id.img_choose);
        btn_choose = (Button) findViewById(R.id.btn_choose);
        gay_choose = (Gallery) findViewById(R.id.gay_choose);

        mAdapter = new MeiziAdapter(mContext, imageIds);
        gay_choose.setAdapter(mAdapter);
        gay_choose.setOnItemSelectedListener(this);
        btn_choose.setOnClickListener(this);

    }

    @Override
    public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {
        img_choose.setImageResource(imageIds[position]);
        index = position;
    }

    @Override
    public void onNothingSelected(AdapterView<?> parent) {
    }

    @Override
    public void onClick(View v) {
        Intent it = new Intent(mContext, CaClothes.class);
        Bundle bundle = new Bundle();
        bundle.putCharSequence("num", Integer.toString(index));
        it.putExtras(bundle);
        startActivity(it);
    }
}

<?xml version="1.0" encoding="utf-8"?>
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <ImageView
        android:id="@+id/img_after"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content" />

    <ImageView
        android:id="@+id/img_before"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content" />

</FrameLayout>

private ImageView img_after;
private ImageView img_before;
private Bitmap alterBitmap;
private Canvas canvas;
private Paint paint;
private Bitmap after;
private Bitmap before;
private int position;

int[] imageIds1 = new int[]
        {
                R.mipmap.pre1, R.mipmap.pre2, R.mipmap.pre3, R.mipmap.pre4,
                R.mipmap.pre5, R.mipmap.pre6, R.mipmap.pre7, R.mipmap.pre8,
                R.mipmap.pre9, R.mipmap.pre10, R.mipmap.pre11, R.mipmap.pre12,
                R.mipmap.pre13, R.mipmap.pre14, R.mipmap.pre15, R.mipmap.pre16,
                R.mipmap.pre17, R.mipmap.pre18, R.mipmap.pre19, R.mipmap.pre20,
                R.mipmap.pre21
        };

int[] imageIds2 = new int[]
        {
                R.mipmap.after1, R.mipmap.after2, R.mipmap.after3, R.mipmap.after4,
                R.mipmap.after5, R.mipmap.after6, R.mipmap.after7, R.mipmap.after8,
                R.mipmap.after9, R.mipmap.after10, R.mipmap.after11, R