Android:从assets资源目录下安装apk

原文链接：http://blog.csdn.net/annkie/article/details/8150807

为了实现将第三方apk内置在assets资源目录下，再进行安装的目的。

首先将需要安装的apk复制到assets目录下，后缀名改为.mp3或其他免压缩的格式。

测试代码如下：

[java] view plaincopy

1. public class MainActivity extends Activity  
2. {  
3.     private static final String TAG = "ExtractIconFromApk";  
4.   
5.     public void onCreate(Bundle savedInstanceState)  
6.     {  
7.         super.onCreate(savedInstanceState);  
8.         setContentView(R.layout.activity_main);  
9.   
10.         AssetManager assets = getAssets();  
11.         try  
12.         {  
13.             //获取assets资源目录下的himarket.mp3,实际上是himarket.apk,为了避免被编译压缩，修改后缀名。  
14.             InputStream stream = assets.open("himarket.mp3");  
15.             if(stream==null)  
16.             {  
17.                 Log.v(TAG,"no file");  
18.                 return;  
19.             }  
20.               
21.             String folder = "/mnt/sdcard/sm/";  
22.             File f=new File(folder);  
23.             if(!f.exists())  
24.             {  
25.                 f.mkdir();  
26.             }  
27.             String apkPath = "/mnt/sdcard/sm/test.apk";  
28.             File file = new File(apkPath);  
29.             //创建apk文件  
30.             file.createNewFile();  
31.             //将资源中的文件重写到sdcard中  
32.             //<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />  
33.             writeStreamToFile(stream, file);  
34.             //安装apk  
35.             //<uses-permission android:name="android.permission.INSTALL_PACKAGES" />            
36.             installApk(apkPath);  
37.         }  
38.         catch (IOException e)  
39.         {  
40.             // TODO Auto-generated catch block  
41.             e.printStackTrace();  
42.         }         
43.     }  
44.   
45.     private void writeStreamToFile(InputStream stream, File file)  
46.     {  
47.         try  
48.         {  
49.             //  
50.             OutputStream output = null;  
51.             try  
52.             {  
53.                 output = new FileOutputStream(file);  
54.             }  
55.             catch (FileNotFoundException e1)  
56.             {  
57.                 // TODO Auto-generated catch block  
58.                 e1.printStackTrace();  
59.             }  
60.             try  
61.             {  
62.                 try  
63.                 {  
64.                     final byte[] buffer = new byte[1024];  
65.                     int read;  
66.   
67.                     while ((read = stream.read(buffer)) != -1)  
68.                         output.write(buffer, 0, read);  
69.   
70.                     output.flush();  
71.                 }  
72.                 finally  
73.                 {  
74.                     output.close();  
75.                 }  
76.             }  
77.             catch (Exception e)  
78.             {  
79.                 e.printStackTrace();  
80.             }  
81.         }  
82.         finally  
83.         {  
84.             try  
85.             {  
86.                 stream.close();  
87.             }  
88.             catch (IOException e)  
89.             {  
90.                 // TODO Auto-generated catch block  
91.                 e.printStackTrace();  
92.             }  
93.         }  
94.     }  
95.   
96.     private void installApk(String apkPath)  
97.     {  
98.         Log.v(TAG,apkPath);  
99.           
100.         Intent intent = new Intent(Intent.ACTION_VIEW);  
101.         intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);  
102.         intent.setDataAndType(Uri.fromFile(new File(apkPath)),  
103.                 "application/vnd.android.package-archive");  
104.         startActivity(intent);  
105.     }