android数据库(随apk一起发布数据库)

 1 public class TestSqlDatabase{
 2     
 3     private static final String DATABASE_PATH = "/data/data/your.package.name/databases";
 4 
 5     private static final int DATABASE_VERSION = 0;
 6 
 7     private static final String DATABASE_NAME = "test.db";
 8     
 9     private static String outFileName = DATABASE_PATH + "/" + DATABASE_NAME;
10     
11     private Context context;
12 
13 　　　　 private SQLiteDatabase database;
14     
15     public TestSqlDatabase(Context context) {
16         this.context = context;
17         
18         File file = new File(outFileName);
19         if (file.exists()) {
20             database = SQLiteDatabase.openOrCreateDatabase(outFileName, null);
21             if (database.getVersion() != DATABASE_VERSION) {
22                 database.close();
23                 file.delete();    
24             }
25         }
26         try {
27             buildDatabase();
28         } catch (Exception e) {
29             e.printStackTrace();
30         }
31         
32     }
33 
34     private void buildDatabase() throws Exception{
35         InputStream myInput = context.getResources().openRawResource(R.raw.test);
36         File file = new File(outFileName);
37         
38         File dir = new File(DATABASE_PATH);
39         if (!dir.exists()) {
40             if (!dir.mkdir()) {
41                 throw new Exception("创建失败");
42             }
43         }
44         
45         if (!file.exists()) {            
46             try {
47                 OutputStream myOutput = new FileOutputStream(outFileName);
48                 
49                 byte[] buffer = new byte[1024];
50                 int length;
51                 while ((length = myInput.read(buffer))>0){
52                     myOutput.write(buffer, 0, length);
53                 }
54                 myOutput.close();
55                 myInput.close();
56             } catch (Exception e) {
57                 e.printStackTrace();
58             }
59         
60         }
61     }
62 }