本文实例讲述了android编程实现sd卡读取数据库的方法。分享给大家供大家参考，具体如下：
先在 Manifest 里添加权限：
|
1
2
|
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" /><uses-permission android:name="android.permission.MOUNT_UNMOUNT_FILESYSTEMS" /> |
然后在 mainActivity 添加方法：
|
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
|
SQLiteDatabase db;private final String DATABASE_PATH = android.os.Environment .getExternalStorageDirectory().getAbsolutePath() + "/vote";private String DATABASE_FILENAME = "db_vote.db";// 初始化数据库private SQLiteDatabase openDatabase() { try { String databaseFilename = DATABASE_PATH + "/" + DATABASE_FILENAME; File dir = new File(DATABASE_PATH); if (!dir.exists()) dir.mkdir(); if (!(new File(databaseFilename)).exists()) { InputStream is = getResources().openRawResource(R.raw.db_vote); FileOutputStream fos = new FileOutputStream(databaseFilename); byte[] buffer = new byte[8192]; int count = 0; while ((count = is.read(buffer)) > 0) { fos.write(buffer, 0, count); } fos.close(); is.close(); } db = SQLiteDatabase.openOrCreateDatabase(databaseFilename, null); return db; } catch (Exception e) { e.printStackTrace(); } return null;} |
希望本文所述对大家Android程序设计有所帮助。
