the xml layout file is simple.u just need a imageview:

activity_main.xml:

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context=".MainActivity" >

    <ImageView
        android:id="@+id/iv"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:src="@drawable/face"
         />

</RelativeLayout>

package com.example.pictogether;

import android.R.color;
import android.os.Bundle;
import android.app.Activity;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Canvas;
import android.graphics.Matrix;
import android.graphics.Paint;
import android.graphics.PorterDuffXfermode;
import android.view.Menu;
import android.widget.ImageView;

public class MainActivity extends Activity {

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);
		ImageView iv = (ImageView)findViewById(R.id.iv);
		
//		//photo mix ，Canvas draw the pic1 first and draw the pic2 later.
		Bitmap bitmap = BitmapFactory.decodeResource(getResources(), R.drawable.face);
		
		Bitmap alertBitmap = Bitmap.createBitmap(bitmap.getWidth(),bitmap.getHeight(),bitmap.getConfig());
		
		Canvas canvas = new Canvas(alertBitmap);
		Paint paint = new Paint();
		
		canvas.drawBitmap(bitmap,0,0, paint);
		Bitmap ic_luncher = BitmapFactory.decodeResource(getResources(), R.drawable.ic_launcher);
   		canvas.drawBitmap(ic_luncher, 0,0, paint);
		
		iv.setImageBitmap(alertBitmap);
		
	}

	@Override
	public boolean onCreateOptionsMenu(Menu menu) {
		// Inflate the menu; this adds items to the action bar if it is present.
		getMenuInflater().inflate(R.menu.main, menu);
		return true;
	}

}

Android FotoMix,布布扣,bubuko.com

Android FotoMix