我通过此代码获取我的数据库文件
File dbFile=getDatabasePath("EdsysEyfsDB.db");
Log.v("database name checking",dbFile.toString());
我想把这个数据库文件复制到sdcard中,所以我可以为此做一些操作.但是我不能做任何操作.以下代码用于复制到SD卡
if (dbFile.exists()) {
InputStream inStream = new FileInputStream(dbFile);
String file = Environment.getExternalStorageDirectory().getPath()
+"/" + "database.db";
Log.d("file name checking in dbFilecondition",file);
FileOutputStream fs = new FileOutputStream(file);
byte[] buffer = new byte[1444];
while ((byteread = inStream.read(buffer)) != -1) {
bytesum += byteread;
fs.write(buffer,byteread);
}
inStream.close();
fs.close();
}
解决方法
尝试这个希望,这有助于你
public void exportDatabse(String databaseName) {
try {
File sd = Environment.getExternalStorageDirectory();
File data = Environment.getDataDirectory();
if (sd.canWrite()) {
String currentDBPath = "//data//"+getPackageName()+"//databases//"+databaseName+"";
String backupDBPath = "backupname.db";
File currentDB = new File(data,currentDBPath);
File backupDB = new File(sd,backupDBPath);
if (currentDB.exists()) {
FileChannel src = new FileInputStream(currentDB).getChannel();
FileChannel dst = new FileOutputStream(backupDB).getChannel();
dst.transferFrom(src,src.size());
src.close();
dst.close();
}
}
} catch (Exception e) {
}
}
如何调用
exportDatabse("YourDBName");
注意 ：
记住要添加写入外部存储的权限< uses-permission android：name =“android.permission.WRITE_EXTERNAL_STORAGE”/>否则sd.canWrite()将为false.
