android的广播机制和广播的简单使用

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity" >

    <EditText
        android:id="@+id/Eview"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="@string/hello_world" />
    
    <Button 
        android:id="@+id/broadcast"
        android:layout_height="wrap_content"
        android:layout_width="match_parent"
        android:layout_below="@id/Eview"
        android:layout_alignLeft="@id/Eview"
        android:onClick="clickbroadcast"
        android:text="发送"
        />

</RelativeLayout>

package com.example.broadcast;

import android.os.Bundle;
import android.app.Activity;
import android.content.Intent;
import android.view.Menu;
import android.view.View;
import android.widget.EditText;

/**
 * 
 * @author Administrator
 *广播的发送
 */
public class MainActivity extends Activity {

	private EditText eView;

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		//获得布局
		setContentView(R.layout.activity_main);
		//获取布局中的组件的id
		eView=(EditText)this.findViewById(R.id.Eview);
	}

	//按钮的监听器
	//发送广播,使用Intent意图进行发送
	public void clickbroadcast(View v){
		
		//获取输入框的值
		String str=eView.getText().toString().trim();
		//创建意图对象,发送数据
		Intent intent = new Intent();
		//设置广播的频率
		intent.setAction("com.cn");
		System.out.println("+++++");
		//intent传递数据
		intent.putExtra("msg", str);
		
		//发送普通广播
		//this.sendBroadcast(intent);
		
		//发送有序广播
		this.sendOrderedBroadcast(intent, null);
	}
}

package com.example.broadcast;

import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.widget.Toast;
/**
 * 
 * @author Administrator
 *1,使用广播接收数据  继承BroadcastReceiver   
 *2,重写BroadcastReceiver类中的onReceive方法
 *3,注册广播
 *   a,在清单文件中注册(本程序使用)
 *   b,在代码中动态注册
 */

public class MyBroadService extends BroadcastReceiver {
//广播的程序是自己执行的,不需要我们手动操作,只需要订阅号相关的配置就可以了(使用意图过滤器配置一个Action);
	@Override
	public void onReceive(Context context, Intent intent) {
	
		//接收intent传送的参数
		String str=intent.getStringExtra("msg");
		
		Toast.makeText(context, str, Toast.LENGTH_SHORT).show();
	}

}

<receiver 
            android:name=".MyBroadService">
            
            <intent-filter android:priority="100">
                <action android:name="com.cn"  
                   
                    />
             </intent-filter>
                
        </receiver>

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context=".MainActivity" >

  <EditText
        android:id="@+id/Eview"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="@string/hello_world" />

</RelativeLayout>

package com.example.receiver;

import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.app.Activity;
import android.content.Intent;
import android.content.IntentFilter;
import android.view.Menu;
import android.widget.EditText;
/*
 * 数据的显示处理类
 */
public class MainActivity extends Activity {

	private EditText eView;
	private Handler handler;

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);
		eView = (EditText) this.findViewById(R.id.Eview);

		// 使用handler将广播接收到的数据显示出来
		handler = new Handler() {
			//重写handler的方法
			@Override
			public void handleMessage(Message msg) {
				//判断what的值
				switch (msg.what) {
				case 100:
					String msgs = (String) msg.obj;
					eView.setText(msgs);
					break;

				}
			}
		};

		// 动态创建意图过滤器
		IntentFilter filter = new IntentFilter();
		// 设置发送方的广播频率
		filter.addAction("com.cn");
		//设置有序广播的优先级别
		filter.setPriority(1000);
		// 创建 广播类
		MyBroadCastRecever receiver = new MyBroadCastRecever(handler);
		// 注册广播
		this.registerReceiver(receiver, filter);
		
	}

}

package com.example.receiver;

import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.os.Handler;
import android.os.Message;

//广播的动态定义
public class MyBroadCastRecever extends BroadcastReceiver{

	private Handler handler;
	public MyBroadCastRecever(Handler handler){
		this.handler=handler;
	}
	
	@Override
	public void onReceive(Context context, Intent intent) {
		String str =intent.getStringExtra("msg");
		//创建消息对象保存数据 Message对象需要一个what 表示
		Message msg =handler.obtainMessage();
		msg.what=100;
		msg.obj=str;
		//使用handler发送数据,需要一个Message对象,创建一个Message对象
		handler.sendMessage(msg);
	}
}

 <receiver android:name=".MyBroadCastRecever">
            </receiver>