Android BroadcastReceiver 动态与静态注册

最新推荐文章于 2024-10-31 14:15:44 发布

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#android #broadcastreceiver

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本文详细介绍了Android中广播机制的应用，包括静态与动态广播注册的方法，以及如何实现自定义广播的发送与接收。从AndroidManifest.xml配置到Java代码实现，全方位解析广播机制。

一、静态注册

1.在AndroidManifest.xml的标签里加入

<receiver android:name=".Receiver">
      <intent-filter>
          <action android:name="android.hardware.usb.action.USB_DEVICE_ATTACHED" />
          <action android:name="android.hardware.usb.action.USB_DEVICE_DETACHED" />
      </intent-filter>
</receiver>

（我只注册了两个系统usb挂载和卸载的广播，后面会写自定义广播)

2.创建Recevier类

public class Receiver extends BroadcastReceiver {

@Override
public void onReceive(Context context, Intent intent) {
        String action = intent.getAction();
        System.out.println("广播接受者："+action); 
    }    
}

3.拔插USB设备的打印

二、动态注册

1.在要接收广播的类里创建一个IntentFilter，里面加入要接收的广播内容

private static IntentFilter Filter() {
        final IntentFilter intentFilter = new IntentFilter();
        intentFilter.addAction("android.hardware.usb.action.USB_DEVICE_ATTACHED");
        intentFilter.addAction("android.hardware.usb.action.USB_DEVICE_DETACHED");
        return intentFilter;
    }

2.new一个BroadcastReceiver 用于接收广播

    private BroadcastReceiver receiver = new BroadcastReceiver() {
        @Override
        public void onReceive(Context context, Intent intent) {
            String action = intent.getAction();
            System.out.println("广播接受者："+action);
        }
    };

3.在Activity的生命周期里动态注册和动态取消广播接受者

    protected void onResume() {
        // TODO Auto-generated method stub
        super.onResume();
            //注册
            registerReceiver(receiver , Filter());
    }


    @Override
    protected void onPause() {
        // TODO Auto-generated method stub
        super.onPause();
          //取消
             unregisterReceiver(receiver);
    }

三、自定义广播发送

1.在AndroidManifest.xml的标签里加入

 <receiver android:name=".Receiver">  
       <intent-filter>  
               <action android:name="cn.text"/>  
     </intent-filter>  
 </receiver>

2.手动发送广播。

     package cn.text.broadcastsender;  

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;  
import android.widget.Toast;  

public class MainActivity extends Activity {  
private Button button;  
private OnClickListener listener = new OnClickListener(){  
@Override  
    public void onClick(View v) {  
        Intent intent = new Intent();  
        intent.setAction("cn.text");  
        intent.putExtra("name", "text");  
        MainActivity.this.sendBroadcast(intent);  
        Toast.makeText(getApplicationContext(), "发送广播成功", Toast.LENGTH_SHORT).show();  
        }  
    };  
    @Override  
    public void onCreate(Bundle savedInstanceState) {  
        super.onCreate(savedInstanceState);  
        setContentView(R.layout.main);  
        button = (Button)this.findViewById(R.id.button);  
        button.setOnClickListener(listener);  
    }  
}

3.接收广播

    package cn.text.broadcastreceiver;  

import android.content.BroadcastReceiver;  
import android.content.Context;  
import android.content.Intent;  


public class Receiver extends BroadcastReceiver {  

@Override  
public void onReceive(Context context, Intent intent) {  
    String name = intent.getExtras().getString("name");  
    System.out.println("接收的内容"+name)
    }  

}