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：
<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：
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。
