Java 是否可以在android中备份和恢复数据库文件？非根设备
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is it possible backup and RESTORE a database file in android? non root devices
提问by angel
in my app I need get a backup of my database, but after I'll need restore it again,
在我的应用程序中，我需要备份我的数据库，但是在我需要再次恢复它之后，
i have read somethings, but i do not sure if this is necessary to have a rooted device, i need backup/restore the all data in non root devices, is it possible?
我读过一些东西，但我不确定这是否有必要拥有 root 设备，我需要备份/恢复非 root 设备中的所有数据，这可能吗？
my first idea was creating a txt file for write the select, and later insert it again.
我的第一个想法是创建一个用于写入选择的 txt 文件，然后再次插入。
but i believe this is much "problem" then i don't know if this is possible copy the database and paste in sd card for backup, and copy from sd card and paste in path of database for restore for non root devices.
但我相信这是一个很大的“问题”，然后我不知道这是否可能复制数据库并粘贴到 SD 卡中进行备份，然后从 SD 卡复制并粘贴到数据库路径中以用于非 root 设备的恢复。
采纳答案by adefran83
Here is some code to make it work
这是一些使其工作的代码
private void importDB() {
try {
File sd = Environment.getExternalStorageDirectory();
File data = Environment.getDataDirectory();
if (sd.canWrite()) {
String currentDBPath = "//data//" + "<package name>"
+ "//databases//" + "<database name>";
String backupDBPath = "<backup db filename>"; // From SD directory.
File backupDB = new File(data, currentDBPath);
File currentDB = new File(sd, backupDBPath);
FileChannel src = new FileInputStream(backupDB).getChannel();
FileChannel dst = new FileOutputStream(currentDB).getChannel();
dst.transferFrom(src, 0, src.size());
src.close();
dst.close();
Toast.makeText(getApplicationContext(), "Import Successful!",
Toast.LENGTH_SHORT).show();
}
} catch (Exception e) {
Toast.makeText(getApplicationContext(), "Import Failed!", Toast.LENGTH_SHORT)
.show();
}
}
private void exportDB() {
try {
File sd = Environment.getExternalStorageDirectory();
File data = Environment.getDataDirectory();
if (sd.canWrite()) {
String currentDBPath = "//data//" + "<package name>"
+ "//databases//" + "<db name>";
String backupDBPath = "<destination>";
File currentDB = new File(data, currentDBPath);
File backupDB = new File(sd, backupDBPath);
FileChannel src = new FileInputStream(currentDB).getChannel();
FileChannel dst = new FileOutputStream(backupDB).getChannel();
dst.transferFrom(src, 0, src.size());
src.close();
dst.close();
Toast.makeText(getApplicationContext(), "Backup Successful!",
Toast.LENGTH_SHORT).show();
}
} catch (Exception e) {
Toast.makeText(getApplicationContext(), "Backup Failed!", Toast.LENGTH_SHORT)
.show();
}
}
