Broadcast-----------自定义Action , 两种方式 实现广播Broadcast

  掌握Broadcast,要掌握一下三点

1:注册广播:(有两种方式)

     一是动态方式使用Context.registerReceiver()方法来注册;
     二是静态方式,即在AndroidManifest.xml中通过<receiver> 。

2:发送广播:

      在需要广播的地方sendBroadcast(intent); 之前要给Intent的对象intent 设置Action (Action可以被系统的或自定义的)和 data。

3:接收广播:

           就是在extends Broadcast的那个类中, onReceive(Context context, Intent intent)方法要做的事情。

 

 ***静态方式:

下面代码是用静态方式和自定义action实现的广播:

运行结果如下:

 

具体代码:

main.xml

<?xml version="1.0" encoding="utf-8"?>  
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"  
    android:layout_width="fill_parent"  
    android:layout_height="fill_parent"  
    android:orientation="vertical" >  
  
    <Button  
        android:id="@+id/b"  
        android:layout_width="fill_parent"  
        android:layout_height="wrap_content"  
        android:text="发送" />  
    <Button  
        android:id="@+id/cancle"  
        android:layout_width="fill_parent"  
        android:layout_height="wrap_content"  
        android:text="exit" />  
  
</LinearLayout>  

  TestActivity.java

package m.m.m;

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

public class TestActivity extends Activity {
	
	private Button b;
	private Button cancle;
	public static final String MY_ACTION = "mxp";
	@Override
	protected void onCreate(Bundle savedInstanceState) {
		// TODO Auto-generated method stub
		super.onCreate(savedInstanceState);
		setContentView(R.layout.main);
		b = (Button) findViewById(R.id.b);
		cancle = (Button) findViewById(R.id.cancle);
		
		b.setOnClickListener(new OnClickListener() {
			
			@Override
			public void onClick(View v) {
				// TODO Auto-generated method stub
				Intent intent  = new Intent();
				intent.setAction(MY_ACTION);
				intent.putExtra("msg", "asdsdas");
				sendBroadcast(intent);
			}
		});
		cancle.setOnClickListener(new OnClickListener() {
			
			@Override
			public void onClick(View v) {
				finish();
			}
		});
	}
}

  AndroidManifest.xml

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="m.m.m"
    android:versionCode="1"
    android:versionName="1.0" >

    <uses-sdk android:minSdkVersion="8" />

    <application
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name" >
        <activity
            android:name=".TestActivity"
            android:label="@string/app_name" >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
        
        <receiver android:name=".BroadCastActivity">
            <intent-filter >
                <action android:name="mxp"/>
            </intent-filter>
        </receiver>
        
    </application>

</manifest>

  

 总结 :自定义Action,就是定义一个静态常量如:public static final String MY_ACTION = "mxp";但是不要和系统的重复哦!

                对我而言,关键是注册,即

                 <receiver android:name=".BroadCastActivity">  注册广播

                       <intent-filter >

                            <action android:name="mxp"/> 定义action

                       </intent-filter>

               </receiver>

 

 

 ***动态方式:

 

    还针对上面的例子进行说明:这回程序运行结果如下:

 1)不要androidManifest.xml文件中注册 ,即删除刚才注册的部分

  2) 在启动服务的地方,即发送按钮的监听器里注册,再启动服务

  TestActivity.java 多了注册的代码:myReceiver = new MyReceiver();
                             IntentFilter filter = new IntentFilter();
                           filter.addAction(MY_ACTION);

 

 TestActivity.java:

package m.m.m;

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

public class TestActivity extends Activity {
	
	private Button bind;
	private Button unbind;
	private Button cancle;
	protected MyReceiver myReceiver;
	public static final String MY_ACTION = "mxp";
	@Override
	protected void onCreate(Bundle savedInstanceState) {
		// TODO Auto-generated method stub
		super.onCreate(savedInstanceState);
		setContentView(R.layout.main);
		bind = (Button) findViewById(R.id.bind);
		unbind = (Button) findViewById(R.id.unbind);
		cancle = (Button) findViewById(R.id.cancle);
		
		bind.setOnClickListener(new OnClickListener() {
			
			@Override
			public void onClick(View v) {
				// TODO Auto-generated method stub
				
				myReceiver = new BroadCastActivity();
				IntentFilter filter = new IntentFilter();
				filter.addAction(MY_ACTION);
				
				TestActivity.this.registerReceiver(myReceiver, filter);
				System.out.println("bind");
				
				Intent intent  = new Intent();
				intent.setAction(MY_ACTION);
				intent.putExtra("msg", "asdsdas");
				sendBroadcast(intent);
			}
		});
		unbind.setOnClickListener(new OnClickListener() {
			
			@Override
			public void onClick(View v) {
				TestActivity.this.unregisterReceiver(myReceiver);
				System.out.println("unbind");
			}
		});
		cancle.setOnClickListener(new OnClickListener() {
			
			@Override
			public void onClick(View v) {
				finish();
			}
		});
	}
	
	@Override
	protected void onResume() {
		// TODO Auto-generated method stub
		super.onResume();
	}
}

  main.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:orientation="vertical" >

    <Button
        android:id="@+id/bind"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:text="绑定" />
    <Button
        android:id="@+id/unbind"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:text="取消绑定" />
    <Button
        android:id="@+id/cancle"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:text="exit" />

</LinearLayout>

  总结:我在测试时点击绑定怎么都不显示Toast的内容,原因是我只注册了广播,没有发送广播。要想广播响应,一定要注册还要发送!

posted @ 2013-04-14 18:43  盗草人  阅读(915)  评论(0编辑  收藏  举报