撕开美女的衣服

1、视图

 1 <FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
 2     xmlns:tools="http://schemas.android.com/tools"
 3     android:layout_width="match_parent"
 4     android:layout_height="match_parent"
 5
 6     tools:context=".MainActivity" >
 7
 8     <ImageView
 9         android:layout_width="wrap_content"
10         android:layout_height="wrap_content"
11         android:id="@+id/iv_back" />
12
13     <ImageView
14         android:layout_width="wrap_content"
15         android:layout_height="wrap_content"
16         android:id="@+id/iv_up" />
17
18 </FrameLayout>

2、实现代码

 1 package com.example.girl;
 2
 3 import android.os.Bundle;
 4 import android.app.Activity;
 5 import android.graphics.Bitmap;
 6 import android.graphics.BitmapFactory;
 7 import android.graphics.BitmapFactory.Options;
 8 import android.graphics.Canvas;
 9 import android.graphics.Color;
10 import android.graphics.Matrix;
11 import android.graphics.Paint;
12 import android.view.Menu;
13 import android.view.MotionEvent;
14 import android.view.View;
15 import android.view.View.OnTouchListener;
16 import android.widget.ImageView;
17
18 public class MainActivity extends Activity {
19     private ImageView iv_back;
20     private ImageView iv_up;
21     private Bitmap alterBitmap;
22     private Canvas canvas;
23     private Paint paint;
24     @Override
25     protected void onCreate(Bundle savedInstanceState) {
26         super.onCreate(savedInstanceState);
27         setContentView(R.layout.activity_main);
28
29         iv_back = (ImageView) findViewById(R.id.iv_back);
30         iv_up = (ImageView) findViewById(R.id.iv_up);
31
32         BitmapFactory.Options opts = new Options();
33         opts.inSampleSize = 1;
34
35         Bitmap back = BitmapFactory.decodeResource(getResources(), R.drawable.back, opts);
36         Bitmap up = BitmapFactory.decodeResource(getResources(), R.drawable.up, opts);
37
38         //可以修改的空白的bitmap
39         alterBitmap = Bitmap.createBitmap(up.getWidth(), up.getHeight(), up.getConfig());
40
41         canvas = new Canvas(alterBitmap);//画布
42         paint = new Paint();//画笔
43         paint.setStrokeWidth(5);
44         paint.setColor(Color.BLACK);
45         canvas.drawBitmap(up, new Matrix(), paint);//把up的图片放进来,这样上面才可以看到覆盖图
46         iv_back.setImageBitmap(back);
47         iv_up.setImageBitmap(alterBitmap);
48
49         iv_up.setOnTouchListener(new OnTouchListener(){
50             int startX;
51             int startY;
52             @Override
53             public boolean onTouch(View arg0, MotionEvent event) {
54                 // TODO Auto-generated method stub
55                 switch(event.getAction()){
56                 case MotionEvent.ACTION_DOWN:
57                     startX = (int)event.getX();
58                     startY = (int)event.getY();
59                     break;
60                 case MotionEvent.ACTION_MOVE:
61                     int newX = (int)event.getX();
62                     int newY = (int)event.getY();
63                     for(int i=-5; i < 5; i++){
64                         for(int j=-5; j < 5; j++){
65                             if(((i+newX) > 0 && (i+newX) < iv_up.getWidth()) &&
66                                     ((j+newY) > 0 && (j+newY) < iv_up.getHeight())//关于做大于0并且小于图片宽高的判断，防止越界
67                                     ){
68                             alterBitmap.setPixel(i+newX, j+newY, Color.TRANSPARENT);//把颜色设为透明的
69                             }
70                         }
71                     }
72                     System.out.println(newX + "----" + newY);
73                     iv_up.setImageBitmap(alterBitmap);
74                     break;
75                 case MotionEvent.ACTION_UP:
76                     break;
77                 }
78                 return true;
79             }
80
81         });
82     }
83
84
85 }