broadcast>基础

1、注册

2、怎么动作

3、怎么发送

4、由啥接收条件

5、应用例子

注册：1、动态注册随activity的销毁而销毁2、静态注册（在manifest.xml）中注册，注册到系统中，不会随activity的销毁而销毁

动作：1.系统给的2、自定义的 “包名”+“.”+"动作描述"

发送：sendbroadcast(intent)

接收：由满足动作的activity接收

应用例子：电量计等

package com.ct.mytestbroad;

import android.os.Bundle;
import android.app.Activity;
import android.content.Intent;
import android.content.IntentFilter;
import android.view.Menu;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.ProgressBar;

public class MainActivity extends Activity {
     private static Button button=null;  
     private static ProgressBar bar=null; 
     private IntentFilter filter; 
     Broadcasttest t;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        button=(Button)findViewById(R.id.button);  
        bar=(ProgressBar)findViewById(R.id.bar);
        button.setOnClickListener(new ButtonClick());
    }

    public static Button getButton()  
    {  
        return button;  
    }  
      
    public static ProgressBar getBar()  
    {  
        return bar;  
    }
    
    class ButtonClick implements OnClickListener{

        @Override
        public void onClick(View v) {
            // TODO Auto-generated method stub
            t = new Broadcasttest();
            filter = new IntentFilter();
            filter.addAction(Intent.ACTION_EDIT);
            Intent intent = new Intent();
            intent.setAction(Intent.ACTION_EDIT );
            registerReceiver(t, filter);
            sendBroadcast(intent);
        }
        
    }
    
    
    
    @Override
    protected void onDestroy() {
        // TODO Auto-generated method stub
        super.onDestroy();
        unregisterReceiver(t);
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.main, menu);
        return true;
    }

}

package com.ct.mytestbroad;

import android.os.Bundle;
import android.app.Activity;
import android.content.Intent;
import android.content.IntentFilter;
import android.view.Menu;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.ProgressBar;

public class MainActivity extends Activity {
     private static Button button=null;  
     private static ProgressBar bar=null; 
     private IntentFilter filter; 
     Broadcasttest t;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        button=(Button)findViewById(R.id.button);  
        bar=(ProgressBar)findViewById(R.id.bar);
        button.setOnClickListener(new ButtonClick());
    }

    public static Button getButton()  
    {  
        return button;  
    }  
      
    public static ProgressBar getBar()  
    {  
        return bar;  
    }
    
    class ButtonClick implements OnClickListener{

        @Override
        public void onClick(View v) {
            // TODO Auto-generated method stub
            t = new Broadcasttest();
            filter = new IntentFilter();
            filter.addAction(Intent.ACTION_EDIT);
            Intent intent = new Intent();
            intent.setAction(Intent.ACTION_EDIT );
            registerReceiver(t, filter);
            sendBroadcast(intent);
        }
        
    }
    
    
    
    @Override
    protected void onDestroy() {
        // TODO Auto-generated method stub
        super.onDestroy();
        unregisterReceiver(t);
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.main, menu);
        return true;
    }

}

（在F:\java\MyTestBroad）