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/*
* Copyright (C) 2011 The Android Open Source Project
*
* 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.example.android.supportv4.content;
import com.example.android.supportv4.R;
import android.app.Activity;
import android.app.Service;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.os.Bundle;
import android.os.Handler;
import android.os.IBinder;
import android.os.Message;
import android.support.v4.app.ServiceCompat;
import android.support.v4.content.LocalBroadcastManager;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.TextView;
/**
* Demonstrates the use of a LocalBroadcastManager to easily communicate
* data from a service to any other interested code.
*/
public class LocalServiceBroadcaster extends Activity {
static final String ACTION_STARTED = "com.example.android.supportv4.STARTED";
static final String ACTION_UPDATE = "com.example.android.supportv4.UPDATE";
static final String ACTION_STOPPED = "com.example.android.supportv4.STOPPED";
LocalBroadcastManager mLocalBroadcastManager;
BroadcastReceiver mReceiver;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.local_service_broadcaster);
// This is where we print the data we get back.
final TextView callbackData = (TextView)findViewById(R.id.callback);
// Put in some initial text.
callbackData.setText("No broadcast received yet");
// We use this to send broadcasts within our local process.
mLocalBroadcastManager = LocalBroadcastManager.getInstance(this);
// We are going to watch for interesting local broadcasts.
IntentFilter filter = new IntentFilter();
filter.addAction(ACTION_STARTED);
filter.addAction(ACTION_UPDATE);
filter.addAction(ACTION_STOPPED);
mReceiver = new BroadcastReceiver() {
@Override
public void onReceive(Context context, Intent intent) {
if (intent.getAction().equals(ACTION_STARTED)) {
callbackData.setText("STARTED");
} else if (intent.getAction().equals(ACTION_UPDATE)) {
callbackData.setText("Got update: " + intent.getIntExtra("value", 0));
} else if (intent.getAction().equals(ACTION_STOPPED)) {
callbackData.setText("STOPPED");
}
}
};
mLocalBroadcastManager.registerReceiver(mReceiver, filter);
// Watch for button clicks.
Button button = (Button)findViewById(R.id.start);
button.setOnClickListener(mStartListener);
button = (Button)findViewById(R.id.stop);
button.setOnClickListener(mStopListener);
}
@Override
protected void onDestroy() {
super.onDestroy();
mLocalBroadcastManager.unregisterReceiver(mReceiver);
}
private OnClickListener mStartListener = new OnClickListener() {
public void onClick(View v) {
startService(new Intent(LocalServiceBroadcaster.this, LocalService.class));
}
};
private OnClickListener mStopListener = new OnClickListener() {
public void onClick(View v) {
stopService(new Intent(LocalServiceBroadcaster.this, LocalService.class));
}
};
public static class LocalService extends Service {
LocalBroadcastManager mLocalBroadcastManager;
int mCurUpdate;
static final int MSG_UPDATE = 1;
Handler mHandler = new Handler() {
@Override
public void handleMessage(Message msg) {
switch (msg.what) {
case MSG_UPDATE: {
mCurUpdate++;
Intent intent = new Intent(ACTION_UPDATE);
intent.putExtra("value", mCurUpdate);
mLocalBroadcastManager.sendBroadcast(intent);
Message nmsg = mHandler.obtainMessage(MSG_UPDATE);
mHandler.sendMessageDelayed(nmsg, 1000);
} break;
default:
super.handleMessage(msg);
}
}
};
@Override
public void onCreate() {
super.onCreate();
mLocalBroadcastManager = LocalBroadcastManager.getInstance(this);
}
public int onStartCommand(Intent intent, int flags, int startId) {
// Tell any local interested parties about the start.
mLocalBroadcastManager.sendBroadcast(new Intent(ACTION_STARTED));
// Prepare to do update reports.
mHandler.removeMessages(MSG_UPDATE);
Message msg = mHandler.obtainMessage(MSG_UPDATE);
mHandler.sendMessageDelayed(msg, 1000);
return ServiceCompat.START_STICKY;
}
@Override
public void onDestroy() {
super.onDestroy();
// Tell any local interested parties about the stop.
mLocalBroadcastManager.sendBroadcast(new Intent(ACTION_STOPPED));
// Stop doing updates.
mHandler.removeMessages(MSG_UPDATE);
}
@Override
public IBinder onBind(Intent intent) {
return null;
}
}
}
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