Android Activity通过Service更新时间

来源：互联网发布：百科门窗软件下载编辑：程序博客网时间：2024/06/01 14:46

Android中Service功能强大，使用它来更新时间简直是大材小用，然而作为我们学习练习，这样使用也是情有可原的，通过这样简单的使用，来熟悉Service的基本用法，通俗易懂，还是比较容易理解的

启动Service有两种方式，分别是调用startService()和bindService()来启动，我们就分别使用这两种方式来更新界面时间

基本知识：
一、startService()和bindService()启动Service的区别，从Service启动的生命周期来看，区别还是比较大的
这里写图片描述

二、Service与Activity的通信方式，在这里我们使用接口和广播，实现如下：

接口：

public interface InTimeListener {    public void callBackFun(Bundle bundle);}

TimeService：

public class TimeService extends Service {    private boolean serviceRunning = false;    private InTimeListener inTimerListener;    public class TimeBinder extends Binder {        TimeService getService() {            return TimeService.this;        }    }    public void onCreate() {        super.onCreate();        System.out.println("--TimeService onCreate()--");        serviceRunning = true;    }    public void beginTimeListener() {        new Thread() {            public void run() {                while (serviceRunning) {                    Bundle timeBundle = getTime();                    /** 使用广播传递信息 */                    Intent intent = new Intent();                    intent.setAction("com.example.administrator.javastudy.service.TimeReceiver");                    intent.putExtras(timeBundle);                    sendBroadcast(intent);                    try {                        sleep(1000);                    } catch (InterruptedException e) {                        e.printStackTrace();                    }                }            }        }.start();    }    public void startTimeListener() {        if (inTimerListener != null) {            new Thread() {                public void run() {                    while (serviceRunning) {                        Bundle timeBundle = getTime();                        /** 使用回调函数传递信息 */                        inTimerListener.callBackFun(timeBundle);                        try {                            sleep(1000);                        } catch (InterruptedException e) {                            e.printStackTrace();                        }                    }                }            }.start();        }    }    public Bundle getTime() {        Calendar calendar = Calendar.getInstance();        Bundle timeBundle = new Bundle();        timeBundle.putString("year", String.valueOf(calendar.get(Calendar.YEAR)));        timeBundle.putString("month", String.valueOf(calendar.get(Calendar.MONTH) + 1));        timeBundle.putString("day", String.valueOf(calendar.get(Calendar.DAY_OF_MONTH)));        timeBundle.putString("hour", String.valueOf(calendar.get(Calendar.HOUR_OF_DAY)));        timeBundle.putString("minute", String.valueOf(calendar.get(Calendar.MINUTE)));        timeBundle.putString("second", String.valueOf(calendar.get(Calendar.SECOND)));        SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");        String strFormattTme = format.format(new Date(System.currentTimeMillis()));        timeBundle.putString("formatTime", strFormattTme);        return timeBundle;    }    /** 设置回调接口 **/    public void setTimerLintener(InTimeListener inTimerListener) {        this.inTimerListener = inTimerListener;    }    public IBinder onBind(Intent intent) {        // bindService()方式启动时调用        System.out.println("--TimeService onBind()--");        return new TimeBinder();    }    public int onStartCommand(Intent intent, int flags, int startId) {        // 使用startService()方式启动时调用        beginTimeListener();        System.out.println("--TimeService onStartCommand()--");        return super.onStartCommand(intent, flags, startId);    }    public boolean onUnbind(Intent intent) {        System.out.println("--TimeService onUnbind()--");        return super.onUnbind(intent);    }    public void onDestroy() {        serviceRunning = false;        System.out.println("--TimeService onDestroy()--");        super.onDestroy();    }}

广播接收者：

public class TimeReceiver extends BroadcastReceiver {    private InTimeListener inTimeListener;    public void onReceive(Context context, Intent intent) {        if(inTimeListener!= null){            Bundle dataBundle = intent.getExtras();            inTimeListener.callBackFun(dataBundle);        }    }    public void setmTimeListener(InTimeListener inTimeListener){        this.inTimeListener = inTimeListener;    }}

TimeActivity：

public class TimeActivity extends AppCompatActivity {    private TextView mTxtTime;    private Intent mIntent;    private TimeService mTimeService;    private TimeServiceConn mTimeServiceConn;    private TimeService.TimeBinder mTimeBinder = null;    private TimeReceiver mTimeReceiver;    /**     * Handler处理信息     */    private Handler mHandler = new Handler() {        public void handleMessage(Message msg) {            //在handler中更新UI            Bundle timeBundle = msg.getData();            String strYear = timeBundle.getString("year") +                    "年 " + timeBundle.getString("month") +                    "月 " + timeBundle.getString("day") +                    "日 " + timeBundle.getString("hour") +                    "时 " + timeBundle.getString("minute") +                    "分 " + timeBundle.getString("second") +                    "秒";            mTxtTime.setText(strYear);        }    };    /**     * 广播接收器接收信息(静态注册方式)     * TimeActivity$TimeReceiver; no empty constructor     * http://blog.csdn.net/xzongyuan/article/details/39991509     *///    public class TimeReceiver extends BroadcastReceiver {//        public void onReceive(Context context, Intent intent) {//            Bundle timeBundle = intent.getExtras();//            String strYear = timeBundle.getString("year") +//                    "年 " + timeBundle.getString("month") +//                    "月 " + timeBundle.getString("day") +//                    "日 " + timeBundle.getString("hour") +//                    "时 " + timeBundle.getString("minute") +//                    "分 " + timeBundle.getString("second") +//                    "秒";//            mTxtTime.setText(strYear);//        }//    }    class TimeServiceConn implements ServiceConnection {        public void onServiceConnected(ComponentName name, IBinder service) {            System.out.println("---ServiceConnection onServiceConnected()---");            mTimeBinder = (TimeService.TimeBinder) service;            mTimeService = mTimeBinder.getService();            mTimeBinder.getService().setTimerLintener(                    new InTimeListener() {                        @Override                        public void callBackFun(Bundle bundle) {                            Message msg = new Message();                            msg.setData(bundle);                            mHandler.sendMessage(msg);                        }                    });        }        public void onServiceDisconnected(ComponentName name) {            System.out.println("---ServiceConnection onServiceDisconnected()---");            mTimeBinder = null;        }    }    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        System.out.println("---MainActivity onCreate()---");        setContentView(R.layout.activity_time);        onInit();    }    public void onInit() {        mTxtTime = (TextView) findViewById(R.id.txt_time);        mIntent = new Intent(this, TimeService.class);        mTimeServiceConn = new TimeServiceConn();        /**         * 启动Service方式一：startService         * */        startService(mIntent);        /**         * 启动Service方式二：bindService         * *///        bindService(mIntent, mTimeServiceConn, Context.BIND_AUTO_CREATE);        /**         * 动态广播注册         * */        mTimeReceiver = new TimeReceiver();        mTimeReceiver.setmTimeListener(new InTimeListener() {            // 回调函数            public void callBackFun(Bundle timeBundle) {                if (timeBundle != null) {                    String strYear = timeBundle.getString("year") +                            "年 " + timeBundle.getString("month") +                            "月 " + timeBundle.getString("day") +                            "日 " + timeBundle.getString("hour") +                            "时 " + timeBundle.getString("minute") +                            "分 " + timeBundle.getString("second") +                            "秒";                    String strFormatTime = timeBundle.getString("formatTime");                    mTxtTime.setText(strFormatTime);                }            }        });        IntentFilter filter = new IntentFilter();        filter.addAction("com.example.administrator.javastudy.service.TimeReceiver");        registerReceiver(mTimeReceiver,filter);    }    public void onStart() {        super.onStart();        System.out.println("---MainActivity onStart()---");    }    public void onResume() {        super.onResume();        System.out.println("---MainActivity onResume()---");        if (mTimeService != null) {            mTimeService.startTimeListener();        }    }    public void onPause() {        super.onPause();        System.out.println("---MainActivity onPause()---");    }    public void onStop() {        super.onStop();        System.out.println("---MainActivity onStop()---");    }    public void onDestroy() {        /**         * 停止service方式一：stopService         * */        stopService(mIntent);        /**         * 停止service方式二：unbindService         * *///        if (mTimeBinder != null) {//            unbindService(mTimeServiceConn);//        }        unregisterReceiver(mTimeReceiver);        System.out.println("---MainActivity onDestroy()---");        super.onDestroy();    }

Service注册：

  <!-- 注册service -->        <service android:name="com.example.administrator.javastudy.service.TimeService" /> </application>

结果截图：
这里写图片描述

0 0