0102-APP-ALarm-Service

介绍了Alarm调用的一个seveice：

AlarmService.java

/* * Copyright (C) 2007 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.apis.app;// Need the following import to get access to the app resources, since this// class is in a sub-package.import com.example.android.apis.R;import android.app.Activity;import android.app.AlarmManager;import android.app.PendingIntent;import android.content.Intent;import android.os.SystemClock;import android.os.Bundle;import android.view.View;import android.view.View.OnClickListener;import android.widget.Button;import android.widget.Toast;/** * This demonstrates how you can schedule an alarm that causes a service to * be started.  This is useful when you want to schedule alarms that initiate * long-running operations, such as retrieving recent e-mails. */public class AlarmService extends Activity {    private PendingIntent mAlarmSender;        @Overrideprotected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        // Create an IntentSender that will launch our service, to be scheduled        // with the alarm manager.        mAlarmSender = PendingIntent.getService(AlarmService.this,                0, new Intent(AlarmService.this, AlarmService_Service.class), 0);                setContentView(R.layout.alarm_service);        // Watch for button clicks.        Button button = (Button)findViewById(R.id.start_alarm);        button.setOnClickListener(mStartAlarmListener);        button = (Button)findViewById(R.id.stop_alarm);        button.setOnClickListener(mStopAlarmListener);    }    private OnClickListener mStartAlarmListener = new OnClickListener() {        public void onClick(View v) {            // We want the alarm to go off 30 seconds from now.            long firstTime = SystemClock.elapsedRealtime();            // Schedule the alarm!            AlarmManager am = (AlarmManager)getSystemService(ALARM_SERVICE);            am.setRepeating(AlarmManager.ELAPSED_REALTIME_WAKEUP,                            firstTime, 30*1000, mAlarmSender);            // Tell the user about what we did.            Toast.makeText(AlarmService.this, R.string.repeating_scheduled,                    Toast.LENGTH_LONG).show();        }    };    private OnClickListener mStopAlarmListener = new OnClickListener() {        public void onClick(View v) {            // And cancel the alarm.            AlarmManager am = (AlarmManager)getSystemService(ALARM_SERVICE);            am.cancel(mAlarmSender);            // Tell the user about what we did.            Toast.makeText(AlarmService.this, R.string.repeating_unscheduled,                    Toast.LENGTH_LONG).show();        }    };}

AlarmService_Service.java

/* * Copyright (C) 2007 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.apis.app;// Need the following import to get access to the app resources, since this// class is in a sub-package.import com.example.android.apis.R;import android.app.Notification;import android.app.NotificationManager;import android.app.PendingIntent;import android.app.Service;import android.content.Intent;import android.os.Binder;import android.os.IBinder;import android.os.Parcel;import android.os.RemoteException;import android.widget.Toast;/** * This is an example of implementing an application service that will run in * response to an alarm, allowing us to move long duration work out of an * intent receiver. *  * @see AlarmService * @see AlarmService_Alarm */public class AlarmService_Service extends Service {    NotificationManager mNM;    @Override    public void onCreate() {        mNM = (NotificationManager)getSystemService(NOTIFICATION_SERVICE);        // show the icon in the status bar        showNotification();        // Start up the thread running the service.  Note that we create a        // separate thread because the service normally runs in the process's        // main thread, which we don't want to block.        Thread thr = new Thread(null, mTask, "AlarmService_Service");        thr.start();    }    @Override    public void onDestroy() {        // Cancel the notification -- we use the same ID that we had used to start it        mNM.cancel(R.string.alarm_service_started);        // Tell the user we stopped.        Toast.makeText(this, R.string.alarm_service_finished, Toast.LENGTH_SHORT).show();    }    /**     * The function that runs in our worker thread     */    Runnable mTask = new Runnable() {        public void run() {            // Normally we would do some work here...  for our sample, we will            // just sleep for 30 seconds.            long endTime = System.currentTimeMillis() + 15*1000;            while (System.currentTimeMillis() < endTime) {                synchronized (mBinder) {                    try {                        mBinder.wait(endTime - System.currentTimeMillis());                    } catch (Exception e) {                    }                }            }            // Done with our work...  stop the service!            AlarmService_Service.this.stopSelf();        }    };    @Override    public IBinder onBind(Intent intent) {        return mBinder;    }    /**     * Show a notification while this service is running.     */    private void showNotification() {        // In this sample, we'll use the same text for the ticker and the expanded notification        CharSequence text = getText(R.string.alarm_service_started);        // Set the icon, scrolling text and timestamp        Notification notification = new Notification(R.drawable.stat_sample, text,                System.currentTimeMillis());        // The PendingIntent to launch our activity if the user selects this notification        PendingIntent contentIntent = PendingIntent.getActivity(this, 0,                new Intent(this, AlarmService.class), 0);        // Set the info for the views that show in the notification panel.        notification.setLatestEventInfo(this, getText(R.string.alarm_service_label),                       text, contentIntent);        // Send the notification.        // We use a layout id because it is a unique number.  We use it later to cancel.        mNM.notify(R.string.alarm_service_started, notification);    }    /**     * This is the object that receives interactions from clients.  See RemoteService     * for a more complete example.     */    private final IBinder mBinder = new Binder() {        @Overrideprotected boolean onTransact(int code, Parcel data, Parcel reply,        int flags) throws RemoteException {            return super.onTransact(code, data, reply, flags);        }    };}