| /* |
| * 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; |
| } |
| } |
| } |