【安卓笔记】作为内部类的广播接收者

package com.example.brocastdemo;

import android.app.Activity;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;

public class MainActivity extends Activity
{
    private Button but = null;

    @Override
    protected void onCreate(Bundle savedInstanceState)
    {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        but = (Button) findViewById(R.id.but);
        but.setOnClickListener(new OnClickListener()
        {
            
            @Override
            public void onClick(View v)
            {
                Intent intent = new Intent("com.aaa");
                MainActivity.this.sendBroadcast(intent);
            }
        });
    }

    public static class MyReceiver extends BroadcastReceiver//作为内部类的广播接收者
    {
        @Override
        public void onReceive(Context context, Intent intent)
        {
            if (intent.getAction().equals("com.aaa"))
            {
                Log.i("MainActivity","成功收到广播");
            }
        }
    }
}

<receiver 
            android:name="com.example.brocastdemo.MainActivity$MyReceiver"
            >
            <intent-filter >
                <action android:name="com.aaa"/>
            </intent-filter>
            
  </receiver>

 android:name="com.example.brocastdemo.MainActivity$MyReceiver"

02-19 09:11:14.650: E/AndroidRuntime(1771): java.lang.RuntimeException: Unable to instantiate receiver com.example.brocastdemo.MainActivity$MyReceiver: java.lang.InstantiationException: can‘t instantiate class com.example.brocastdemo.MainActivity$MyReceiver; no empty constructor

package com.example.brocastdemo;

import android.app.Activity;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
//采用动态方式注册一个作为内部类的广播接收者
public class MainActivity extends Activity
{
    private Button but = null;
    private MyReceiver receiver = null;

    @Override
    protected void onCreate(Bundle savedInstanceState)
    {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        but = (Button) findViewById(R.id.but);
        
        /*动态方式注册广播接收者*/
        receiver = new MyReceiver();
        IntentFilter filter = new IntentFilter();
        filter.addAction("com.aaa");
        this.registerReceiver(receiver, filter);
        
        but.setOnClickListener(new OnClickListener()
        {
            
            @Override
            public void onClick(View v)
            {
                Intent intent = new Intent("com.aaa");
                MainActivity.this.sendBroadcast(intent);
            }
        });
    }

    public class MyReceiver extends BroadcastReceiver
    {
        @Override
        public void onReceive(Context context, Intent intent)
        {
            if (intent.getAction().equals("com.aaa"))
            {
                Log.i("MainActivity","成功收到广播");
            }
        }
    }
    @Override
    protected void onDestroy()
    {
        if(receiver!=null)
            this.unregisterReceiver(receiver);
    }
}