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[英]Backup and restore SQLite database to sdcard in Xamarin Android C#
[英]Backup/Restore to sdcard in Android
我正在尝试将我的应用程序数据库从“首选项”活动备份/恢复到外部sdCard。 我能够将数据库保存到外部sdCard,但是现在我不明白如何将这个文件传输回他的默认路径(data \\ package.app \\ databases)。 任何想法?
我这样做是这样的:
出口:
InputStream myInput;
String dbpath = "/data/"+pckgname+"/databases/refuel_db";
String sdpath = Environment.getExternalStorageDirectory().getPath();
try {
myInput = new FileInputStream(Environment.getDataDirectory()
+ dbpath);
// Set the output folder on the Scard
File directory = new File(sdpath + "/Refuel");
// Create the folder if it doesn't exist:
if (!directory.exists()) {
directory.mkdirs();
}
// Set the output file stream up:
OutputStream myOutput = new FileOutputStream(directory.getPath()
+ "/refuel_db");
// Transfer bytes from the input file to the output file
byte[] buffer = new byte[1024];
int length;
while ((length = myInput.read(buffer)) > 0) {
myOutput.write(buffer, 0, length);
}
// Close and clear the streams
myOutput.flush();
myOutput.close();
myInput.close();
Toast.makeText(getActivity(), "Backup Done Succesfully!", Toast.LENGTH_LONG)
.show();
} catch (FileNotFoundException e) {
Toast.makeText(getActivity(), "ERROR " + e, Toast.LENGTH_LONG).show();
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
Toast.makeText(getActivity(), "ERROR " + e, Toast.LENGTH_LONG).show();
// TODO Auto-generated catch block
e.printStackTrace();
}
进口:
OutputStream myOutput;
String dbpath = "/data/"+pckgname+"/databases/refuel_db";
String sdpath = Environment.getExternalStorageDirectory().getPath();
try {
myOutput = new FileOutputStream(Environment.getDataDirectory()
+ dbpath);
// Set the folder on the SDcard
File directory = new File(sdpath + "/Refuel");
// Set the input file stream up:
InputStream myInputs = new FileInputStream(directory.getPath()
+ "/refuel_db");
// Transfer bytes from the input file to the output file
byte[] buffer = new byte[1024];
int length;
while ((length = myInputs.read(buffer)) > 0) {
myOutput.write(buffer, 0, length);
}
// Close and clear the streams
myOutput.flush();
myOutput.close();
myInputs.close();
Toast.makeText(getActivity(), "Import Done Succesfully!", Toast.LENGTH_LONG)
.show();
} catch (FileNotFoundException e) {
Toast.makeText(getActivity(), "ERROR " + e, Toast.LENGTH_LONG).show();
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
Toast.makeText(getActivity(), "ERROR " + e, Toast.LENGTH_LONG).show();
// TODO Auto-generated catch block
e.printStackTrace();
}
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