[Android]Broadcast,Intent,PendingIntent,Handler例子

代码

先提供代码实例，代码运行ok，需要自己再添加一个button。

package com.example.setalarmtest;import android.app.Activity;import android.app.AlarmManager;import android.app.PendingIntent;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.HandlerThread;import android.os.Looper;import android.os.Message;import android.os.PowerManager;import android.util.Log;import android.view.View;import android.widget.Button;public class MainActivity extends Activity {    String TAG = "setAlarm";    private static final String PENDING_INTENT_ALARM = "Pending_Intent_Alarm";    public long alarmTime = 5*1000;    Boolean bTigger = true;    Button mBtSendMsg;    Bundle extras  = new Bundle();    static final int MESSAGE_TIGGER_STEP_1 = 1;    static final int MESSAGE_TIGGER_STEP_2 = 2;    Context mContext = this;    private AlarmManager mAlarm;    private PowerManager mPowerManager;    final HandlerThread mHandlerThread = new HandlerThread(TAG);    private PendingIntent mPendingIntent;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        Init();        final TriggerHandler mTriggerHandler = new TriggerHandler(mHandlerThread.getLooper());// handler 需要在thread启动之后才能进行getlooper        mBtSendMsg = (Button)findViewById(R.id.msgbutton);        mBtSendMsg.setOnClickListener(new View.OnClickListener() {            public void onClick(View v) {                if (bTigger) {                    bTigger = false;                    Log.d(TAG, "Press button to Send MSG in IF");                    //mTriggerHandler.sendEmptyMessage(MESSAGE_TIGGER_STEP_1);                    //Message mMessage = mTriggerHandler.obtainMessage(MESSAGE_TIGGER_STEP_1);//需要即时定义Message，如果只定义一个反复发送会报错                    final Message mMessage = mTriggerHandler.obtainMessage(MESSAGE_TIGGER_STEP_1);                    mMessage.setData(extras);                    mTriggerHandler.sendMessage(mMessage);//如果不final 类型的msg会有错误，如果反复点击需要修改成obtainMessage                }                else {                    bTigger = true;                    Log.d(TAG, "Press button to Send MSG in ELSE");                    mTriggerHandler.sendEmptyMessage(MESSAGE_TIGGER_STEP_2);                }            }        });    }    private void Init(){        extras.putInt("firstMsgNum", 1);        extras.putString("fristMsgName", "FirstMsg");        registerReceiver();        mHandlerThread.start();        mHandlerThread.getLooper();        if (mAlarm == null) {            mAlarm = (AlarmManager) mContext.getSystemService(Context.ALARM_SERVICE);        }        if (mPowerManager == null) {            mPowerManager = (PowerManager) mContext.getSystemService(Context.POWER_SERVICE);        }    }    private final class TriggerHandler extends Handler{        public TriggerHandler(Looper looper){            super(looper);        }        @Override        public void handleMessage(Message msg){            Bundle extras = msg.getData();            switch (msg.what) {            case MESSAGE_TIGGER_STEP_1:                Log.d(TAG, "Get the MESSAGE_TIGGER_STEP_1");                Log.d(TAG, "get the data,num = "+extras.getInt("firstMsgNum")+" name = "+extras.getString("fristMsgName"));                break;            case MESSAGE_TIGGER_STEP_2:                Log.d(TAG, "Get the MESSAGE_TIGGER_STEP_2");                break;            default:                Log.d(TAG, "Do nothing in default");                break;            }        }    }    public void registerReceiver(){//add some action to listern        IntentFilter filter = new IntentFilter();        filter.addAction(Intent.ACTION_SCREEN_ON);        filter.addAction(Intent.ACTION_SCREEN_OFF);        filter.addAction(Intent.ACTION_BOOT_COMPLETED);        filter.addAction(PENDING_INTENT_ALARM);        mContext.registerReceiver(mIntenReceiver, filter);    }    private BroadcastReceiver mIntenReceiver = new BroadcastReceiver() {        @Override        public void onReceive(Context context,Intent intent){            String action = intent.getAction();            if (action.equals(Intent.ACTION_BOOT_COMPLETED)) {                Log.d(TAG, "Will Send alarm");            }            else if (action.equals(intent.ACTION_SCREEN_ON)) {                Log.d(TAG, "Will Send Screen On alarm");                if(mPendingIntent== null){                    Intent pendingIntent  = new Intent(PENDING_INTENT_ALARM).setPackage(null).setFlags(Intent.FLAG_RECEIVER_REGISTERED_ONLY);                    mPendingIntent = PendingIntent.getBroadcast(mContext, 0, pendingIntent, 0);                    mAlarm.setExact(AlarmManager.RTC,System.currentTimeMillis()+alarmTime, mPendingIntent);                }            }            else if (action.equals(intent.ACTION_SCREEN_OFF)) {                Log.d(TAG, "Will Send Screen Off alarm");            }            else if (action.equals(PENDING_INTENT_ALARM)){                final TriggerHandler mTriggerHandler = new TriggerHandler(mHandlerThread.getLooper());                mTriggerHandler.sendEmptyMessage(MESSAGE_TIGGER_STEP_2);            }        }    };}

程序流程：
初始化->创建thread->创建handler->注册广播接收-> 监听bootcomplete/ScreenOn/ScreenOff->收到亮屏广播->设置Alarm->5秒后发送Intent->handler接收并做相应的处理

知识点

Handler

Intent&PendingIntent

BroadcastReceiver

Alarm