/*
|
* Copyright (C) 2014 Google Inc.
|
*
|
* Licensed under the Apache License, Version 2.0 (the "License");
|
* you may not use this file except in compliance with the License.
|
* You may obtain a copy of the License at
|
*
|
* http://www.apache.org/licenses/LICENSE-2.0
|
*
|
* Unless required by applicable law or agreed to in writing, software
|
* distributed under the License is distributed on an "AS IS" BASIS,
|
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
* See the License for the specific language governing permissions and
|
* limitations under the License.
|
*/
|
|
package com.taoke.autopay.android.utils.accessibility.internal;
|
|
import android.content.BroadcastReceiver;
|
import android.content.Context;
|
import android.content.Intent;
|
import android.content.IntentFilter;
|
import android.net.Uri;
|
|
/**
|
* Helper class for monitoring packages on the system.
|
*
|
* @author svetoslavganov@google.com (Svetoslav R. Ganov)
|
* @author alanv@google.com (Alan Viverette)
|
*/
|
public abstract class BasePackageMonitor extends BroadcastReceiver {
|
|
/**
|
* The intent filter to match package modifications.
|
*/
|
private final IntentFilter mPackageFilter;
|
|
/**
|
* The context in which this monitor is registered.
|
*/
|
private Context mRegisteredContext;
|
|
/**
|
* Creates a new instance.
|
*/
|
public BasePackageMonitor() {
|
mPackageFilter = new IntentFilter();
|
mPackageFilter.addAction(Intent.ACTION_PACKAGE_ADDED);
|
mPackageFilter.addAction(Intent.ACTION_PACKAGE_REMOVED);
|
mPackageFilter.addAction(Intent.ACTION_PACKAGE_CHANGED);
|
mPackageFilter.addDataScheme("package");
|
}
|
|
/**
|
* Register this monitor via the given <code>context</code>. Throws an
|
* {@link IllegalStateException} if this monitor was already registered.
|
*/
|
public void register(Context context) {
|
if (mRegisteredContext != null) {
|
throw new IllegalStateException("Already registered");
|
}
|
|
mRegisteredContext = context;
|
context.registerReceiver(this, mPackageFilter);
|
}
|
|
/**
|
* Unregister this monitor. Throws an {@link IllegalStateException} if this
|
* monitor wasn't registered.
|
*/
|
public void unregister() {
|
if (mRegisteredContext == null) {
|
throw new IllegalStateException("Not registered");
|
}
|
|
mRegisteredContext.unregisterReceiver(this);
|
mRegisteredContext = null;
|
}
|
|
@Override
|
public void onReceive(Context context, Intent intent) {
|
final String packageName = getPackageName(intent);
|
final String action = intent.getAction();
|
|
if (Intent.ACTION_PACKAGE_ADDED.equals(action)) {
|
onPackageAdded(packageName);
|
} else if (Intent.ACTION_PACKAGE_REMOVED.equals(action)) {
|
onPackageRemoved(packageName);
|
} else if (Intent.ACTION_PACKAGE_CHANGED.equals(action)) {
|
onPackageChanged(packageName);
|
}
|
}
|
|
/**
|
* @return The name of the package from an <code>intent</code>.
|
*/
|
private static String getPackageName(Intent intent) {
|
final Uri uri = intent.getData();
|
|
if (uri == null) {
|
return null;
|
}
|
|
return uri.getSchemeSpecificPart();
|
}
|
|
/**
|
* Called when a new application package has been installed on the device.
|
*
|
* @param packageName The name of the package that was added.
|
*/
|
protected abstract void onPackageAdded(String packageName);
|
|
/**
|
* Called when an existing application package has been removed from the
|
* device.
|
*
|
* @param packageName The name of the package that was removed.
|
*/
|
protected abstract void onPackageRemoved(String packageName);
|
|
/**
|
* Called when an existing application package has been changed (e.g. a
|
* component has been disabled or enabled).
|
*
|
* @param packageName The name of the package that was changed.
|
*/
|
protected abstract void onPackageChanged(String packageName);
|
}
|
