Mega Code Archive
A wrapper class for the Android 2 2+ BackupHelper class
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package com.sputnik.wispr.util;
import java.io.IOException;
import android.app.backup.BackupAgentHelper;
import android.app.backup.BackupDataInput;
import android.app.backup.BackupDataOutput;
import android.app.backup.SharedPreferencesBackupHelper;
import android.content.Context;
import android.os.ParcelFileDescriptor;
import android.util.Log;
/**
* A wrapper class for the Android 2.2+ BackupHelper class. It marshalls all calls to the helper to
* the original class, but only if it exists. Inspired on the official doc at
* http://developer.android.com/resources/articles/backward-compatibility.html
*
* @author erickok
*/
public class BackupAgentHelperWrapper extends BackupAgentHelper {
private static String TAG = BackupAgentHelperWrapper.class.getName();
private BackupAgentHelper instance = null;
private static boolean checkAvailability = true;
private static boolean isAvailable = false;
/**
* Class initialization which will fail when the helper class doesn't exist
*/
static {
if (checkAvailability) {
try {
Class.forName("android.app.backup.BackupAgentHelper");
isAvailable = true;
} catch (Exception e) {
isAvailable = false;
} finally {
checkAvailability = false;
}
Log.d(TAG, "isAvailable:" + isAvailable);
}
}
public BackupAgentHelperWrapper() {
if (isAvailable) {
instance = new BackupAgentHelper();
Log.d(TAG, "instance:" + instance);
}
}
protected Context getBackupAgentInstance() {
Context ctx = null;
if (isAvailable) {
ctx = instance;
}
return ctx;
}
@Override
public void onCreate() {
if (isAvailable) {
instance.onCreate();
}
}
@Override
public void onDestroy() {
if (isAvailable) {
instance.onDestroy();
}
}
@Override
public void onBackup(ParcelFileDescriptor oldState, BackupDataOutput data, ParcelFileDescriptor newState)
throws IOException {
if (isAvailable) {
instance.onBackup(oldState, data, newState);
}
}
@Override
public void onRestore(BackupDataInput data, int appVersionCode, ParcelFileDescriptor newState) throws IOException {
if (isAvailable) {
instance.onRestore(data, appVersionCode, newState);
}
}
public void addHelper(String keyPrefix, SharedPreferencesBackupHelper helper) {
if (isAvailable) {
instance.addHelper(keyPrefix, helper);
}
}
@Override
public String getPackageName() {
String pkgName = null;
if (isAvailable) {
Log.d(TAG, "getPackageName@instance:" + instance);
pkgName = instance.getPackageName();
}
return pkgName;
}
}
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