0905-APP-Server-aruments

描述server启动传递以及线程的终止

ServiceStartArguments

/* * 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;import android.app.Activity;import android.app.Notification;import android.app.NotificationManager;import android.app.PendingIntent;import android.app.Service;import android.content.Intent;import android.os.Bundle;import android.os.Handler;import android.os.HandlerThread;import android.os.IBinder;import android.os.Looper;import android.os.Message;import android.os.Process;import android.util.Log;import android.view.View;import android.view.View.OnClickListener;import android.widget.Button;import android.widget.Toast;import com.example.android.apis.R;/** * This is an example of implementing an application service that runs locally * in the same process as the application.  The {@link Controller} * class shows how to interact with the service.  * * <p>Notice the use of the {@link NotificationManager} when interesting things * happen in the service.  This is generally how background services should * interact with the user, rather than doing something more disruptive such as * calling startActivity(). *  * <p>For applications targeting Android 1.5 or beyond, you may want consider * using the {@link android.app.IntentService} class, which takes care of all the * work of creating the extra thread and dispatching commands to it. */public class ServiceStartArguments extends Service {    private NotificationManager mNM;    private Intent mInvokeIntent;    private volatile Looper mServiceLooper;    private volatile ServiceHandler mServiceHandler;        private final class ServiceHandler extends Handler {        public ServiceHandler(Looper looper) {            super(looper);        }                @Override        public void handleMessage(Message msg) {            Bundle arguments = (Bundle)msg.obj;                    String txt = arguments.getString("name");                        Log.i("ServiceStartArguments", "Message: " + msg + ", "                    + arguments.getString("name"));                    if ((msg.arg2&Service.START_FLAG_REDELIVERY) == 0) {                txt = "New cmd #" + msg.arg1 + ": " + txt;            } else {                txt = "Re-delivered #" + msg.arg1 + ": " + txt;            }                        showNotification(txt);                    // Normally we would do some work here...  for our sample, we will            // just sleep for 5 seconds.            long endTime = System.currentTimeMillis() + 5*1000;            while (System.currentTimeMillis() < endTime) {                synchronized (this) {                    try {                        wait(endTime - System.currentTimeMillis());                    } catch (Exception e) {                    }                }            }                    hideNotification();                        Log.i("ServiceStartArguments", "Done with #" + msg.arg1);            stopSelf(msg.arg1);        }    };        @Override    public void onCreate() {        mNM = (NotificationManager)getSystemService(NOTIFICATION_SERVICE);        Toast.makeText(this, R.string.service_created,                Toast.LENGTH_SHORT).show();                // This is who should be launched if the user selects our persistent        // notification.        mInvokeIntent = new Intent(this, Controller.class);        // 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.  We also make it        // background priority so CPU-intensive work will not disrupt our UI.        HandlerThread thread = new HandlerThread("ServiceStartArguments",                Process.THREAD_PRIORITY_BACKGROUND);        thread.start();                mServiceLooper = thread.getLooper();        mServiceHandler = new ServiceHandler(mServiceLooper);    }    @Override    public int onStartCommand(Intent intent, int flags, int startId) {        Log.i("ServiceStartArguments",                "Starting #" + startId + ": " + intent.getExtras());        Message msg = mServiceHandler.obtainMessage();        msg.arg1 = startId;        msg.arg2 = flags;        msg.obj = intent.getExtras();        mServiceHandler.sendMessage(msg);        Log.i("ServiceStartArguments", "Sending: " + msg);                // For the start fail button, we will simulate the process dying        // for some reason in onStartCommand().        if (intent.getBooleanExtra("fail", false)) {            // Don't do this if we are in a retry... the system will            // eventually give up if we keep crashing.            if ((flags&START_FLAG_RETRY) == 0) {                // Since the process hasn't finished handling the command,                // it will be restarted with the command again, regardless of                // whether we return START_REDELIVER_INTENT.                Process.killProcess(Process.myPid());            }        }                // Normally we would consistently return one kind of result...        // however, here we will select between these two, so you can see        // how they impact the behavior.  Try killing the process while it        // is in the middle of executing the different commands.        return intent.getBooleanExtra("redeliver", false)                ? START_REDELIVER_INTENT : START_NOT_STICKY;    }    @Override    public void onDestroy() {        mServiceLooper.quit();        hideNotification();        // Tell the user we stopped.        Toast.makeText(ServiceStartArguments.this, R.string.service_destroyed,                Toast.LENGTH_SHORT).show();    }    @Override    public IBinder onBind(Intent intent) {        return null;    }    /**     * Show a notification while this service is running.     */    private void showNotification(String text) {        // 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, Controller.class), 0);        // Set the info for the views that show in the notification panel.        notification.setLatestEventInfo(this, getText(R.string.service_start_arguments_label),                       text, contentIntent);        // We show this for as long as our service is processing a command.        notification.flags |= Notification.FLAG_ONGOING_EVENT;                // Send the notification.        // We use a string id because it is a unique number.  We use it later to cancel.        mNM.notify(R.string.service_created, notification);    }        private void hideNotification() {        mNM.cancel(R.string.service_created);    }        // ----------------------------------------------------------------------    /**     * Example of explicitly starting the {@link ServiceStartArguments}.     *      * <p>Note that this is implemented as an inner class only keep the sample     * all together; typically this code would appear in some separate class.     */    public static class Controller extends Activity {        @Override        protected void onCreate(Bundle savedInstanceState) {            super.onCreate(savedInstanceState);            setContentView(R.layout.service_start_arguments_controller);            // Watch for button clicks.            Button button = (Button)findViewById(R.id.start1);            button.setOnClickListener(mStart1Listener);            button = (Button)findViewById(R.id.start2);            button.setOnClickListener(mStart2Listener);            button = (Button)findViewById(R.id.start3);            button.setOnClickListener(mStart3Listener);            button = (Button)findViewById(R.id.startfail);            button.setOnClickListener(mStartFailListener);            button = (Button)findViewById(R.id.kill);            button.setOnClickListener(mKillListener);        }        private OnClickListener mStart1Listener = new OnClickListener() {            public void onClick(View v) {                startService(new Intent(Controller.this,                        ServiceStartArguments.class)                                .putExtra("name", "One"));            }        };        private OnClickListener mStart2Listener = new OnClickListener() {            public void onClick(View v) {                startService(new Intent(Controller.this,                        ServiceStartArguments.class)                                .putExtra("name", "Two"));            }        };        private OnClickListener mStart3Listener = new OnClickListener() {            public void onClick(View v) {                startService(new Intent(Controller.this,                        ServiceStartArguments.class)                                .putExtra("name", "Three")                                .putExtra("redeliver", true));            }        };        private OnClickListener mStartFailListener = new OnClickListener() {            public void onClick(View v) {                startService(new Intent(Controller.this,                        ServiceStartArguments.class)                                .putExtra("name", "Failure")                                .putExtra("fail", true));            }        };        private OnClickListener mKillListener = new OnClickListener() {            public void onClick(View v) {                // This is to simulate the service being killed while it is                // running in the background.                Process.killProcess(Process.myPid());            }        };    }}