Android sd卡读取数据库实例代码
前言：
本文主要给大家讲解如何利用Android SD卡读取数据库，提供一些代码如下。先在 Manifest 里添加权限：
<span style="font-size:16px;"><uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" /> <uses-permission android:name="android.permission.MOUNT_UNMOUNT_FILESYSTEMS" /></span>
然后在 mainActivity 添加方法
<span style="font-size:16px;">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;
}</span>
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