Android:静态注册BroadcastReceiver

Android:静态注册BroadcastReceiver

由于动态注册BroadcastReceiver只能在Activity的onCreate()方法调用时才能注册再接收广播，所以当程序没有运行就不能接受到广播；但是静态注册的则不依赖于程序是否处于运行状态。

当然动态注册的好处是，自由灵活。

下面来看一下静态注册的代码吧：

MainActivity.java:

package com.example.staticbroadcastreceiverdemo;

import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.os.SystemClock;

public class MainActivity extends Activity {

    private Handler myHandler;

    //定义一个Intent，用于发送广播；
    private Intent myIntent;

    //子线程标志位；
    private boolean tag = false;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.fragment_main);

        //实例化Intent
        myIntent = new Intent();
        //设置过滤条件；
        myIntent.setAction(com.vrinux.static);

        //此处我使用一个Handler，接收子线程每隔3秒发来一次消息，
        //就发送一个广播，并将值发出去；
        myHandler = new Handler() {

            @Override
            public void handleMessage(Message msg) {
                // TODO Auto-generated method stub
                super.handleMessage(msg);
                int count = msg.arg1;
                myIntent.putExtra(text, 来自activity的广播~ + count);

                //发送广播；
                sendBroadcast(myIntent);
            }
        };

        new Thread(new Runnable() {

            int count = 0;

            @Override
            public void run() {
                // TODO Auto-generated method stub
                //将标志位值设为true;
                tag = true;
                while (tag) {
                    Message msg = Message.obtain();
                    msg.arg1 = count;
                    myHandler.sendMessage(msg);

                    SystemClock.sleep(3000);

                    count += 1;
                }
            }
        }).start();
    }

    @Override
    protected void onDestroy() {
        // TODO Auto-generated method stub
        super.onDestroy();

        //当Activity销毁时，将标志位设置为false;
        //如果不设置为false,则会看到程序退出后手机屏幕上仍然有Toast显示信息；
        //从这点可以看出：1.线程启动后不会随着Activity销毁而销毁；
        //                      2.静态注册的广播比依赖于程序是否处于运行状态；
        if(tag){
            tag = false;
        }       
    }
}

PlaneBroadcastReceiver.java:

package com.example.staticbroadcastreceiverdemo;

import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.util.Log;
import android.widget.Toast;

//继承BroadcastReceiver类；
public class PlaneBroadcastReceiver extends BroadcastReceiver {

    @Override
    public void onReceive(Context context, Intent intent) {
        // TODO Auto-generated method stub
        Log.i(MainActivity,PlaneBroadcastReceiver);

        //获取intent传来的值；
        String text = intent.getStringExtra(text);

        //通过Toast显示在屏幕上；
        Toast.makeText(context, text, Toast.LENGTH_LONG).show();;
    }

}