图片的合成 

 1 package cn.itcast.bitmapcopy;
 2 
 3 import java.io.FileNotFoundException;
 4 
 5 import android.app.Activity;
 6 import android.content.Intent;
 7 import android.graphics.Bitmap;
 8 import android.graphics.BitmapFactory;
 9 import android.graphics.Canvas;
10 import android.graphics.ColorMatrix;
11 import android.graphics.ColorMatrixColorFilter;
12 import android.graphics.Matrix;
13 import android.graphics.Paint;
14 import android.graphics.PorterDuffXfermode;
15 import android.net.Uri;
16 import android.os.Bundle;
17 import android.view.View;
18 import android.widget.ImageView;
19 
20 public class DemoActivity extends Activity {
21     private ImageView iv;
22 
23     @Override
24     public void onCreate(Bundle savedInstanceState) {
25         super.onCreate(savedInstanceState);
26         setContentView(R.layout.main);
27         iv = (ImageView) findViewById(R.id.iv);
28         
29     }
30     
31     
32     public void selectImage(View view){
33         Intent intent = new Intent();
34         intent.setAction("android.intent.action.PICK");
35         intent.addCategory("android.intent.category.DEFAULT");
36         intent.setType("image/*");
37         startActivityForResult(intent, 0);
38     }
39     
40     @Override
41     protected void onActivityResult(int requestCode, int resultCode, Intent data) {
42         try {
43             if (data != null) {
44                 // 得到点击图片的uri
45                 Uri uri = data.getData();
46                 //原图
47                 Bitmap bitmap = BitmapFactory.decodeStream(getContentResolver().openInputStream(uri));
48             
49                 //原图的拷贝
50                 Bitmap alterBitmap  = Bitmap.createBitmap(bitmap.getWidth(), bitmap.getHeight(), bitmap.getConfig());
51                 //以拷贝图片的为模板创建一个画布
52                 Canvas canvas = new Canvas(alterBitmap);
53                 Matrix matrix = new Matrix();
54                 
55                 Paint paint = new Paint();
56 
57                 Bitmap logo =    BitmapFactory.decodeResource(getResources(), R.raw.ic_launcher);
58                 
59                 
60                 canvas.drawBitmap(bitmap, matrix, paint);
61                 //指定了两个图片合成的方式
62                 paint.setXfermode(new PorterDuffXfermode(android.graphics.PorterDuff.Mode.SRC_OVER));
63 
64                 canvas.drawBitmap(logo, matrix, paint);
65                 
66                 
67                 iv.setImageBitmap(alterBitmap);
68             }
69         } catch (FileNotFoundException e) {
70             e.printStackTrace();
71         }
72         super.onActivityResult(requestCode, resultCode, data);
73     }
74 }

效果就是两张图片合成一张图片

posted @ 2013-01-27 15:24  王世桢  阅读(288)  评论(0)  编辑  收藏  举报