ImageMatrixView.java

package com.imooc.myapplication;

import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Canvas;
import android.graphics.Matrix;
import android.util.AttributeSet;
import android.view.View;

public class ImageMatrixView extends View {

    private Matrix mMatrix;
    private Bitmap mBitmap;

    public ImageMatrixView(Context context) {
        super(context);
        initMyView();
    }

    public ImageMatrixView(Context context, AttributeSet attrs) {
        super(context, attrs);
        initMyView();
    }

    public ImageMatrixView(Context context, AttributeSet attrs, int defStyleAttr) {
        super(context, attrs, defStyleAttr);
        initMyView();
    }

    public void setImageAndMatrix(Bitmap bm, Matrix matrix) {
        mMatrix = matrix;
        mBitmap = bm;
    }

    public void initMyView() {
        Bitmap bitmap = BitmapFactory.decodeResource(getResources(), R.drawable.ic_launcher);
        setImageAndMatrix(bitmap, new Matrix());
    }

    @Override
    protected void onDraw(Canvas canvas) {
        super.onDraw(canvas);
        canvas.drawBitmap(mBitmap, 0, 0, null);
        canvas.drawBitmap(mBitmap, mMatrix, null);
    }
}