[Android]在Avtivity中注册监听器

package com.example.xmlbroadcast;

import android.app.Activity;import android.content.Intent;import android.content.IntentFilter;import android.os.Bundle;import android.view.Menu;import android.view.View;import android.view.View.OnClickListener;import android.widget.Button;import android.widget.TextView;public class MainActivity extends Activity {private TextView tx1=null;private Button bt1=null;private Button bt2=null;private Button bt3=null;    @Override    public void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        bt1=(Button)findViewById(R.id.btn);        bt1.setText("发出广播");        bt1.setOnClickListener(new bt1listener());        bt2=(Button)findViewById(R.id.btn2);        bt2.setText("注册监听器");        bt2.setOnClickListener(new bt2listener());        bt3=(Button)findViewById(R.id.btn3);        bt3.setText("注销监听器");        bt3.setOnClickListener(new bt3listener());        tx1=(TextView)findViewById(R.id.txv);    }    class bt1listener implements OnClickListener{public void onClick(View v) {// TODO Auto-generated method stubtx1.setText("fuck");Intent it1=new Intent();it1.setAction(Intent.ACTION_EDIT);MainActivity.this.sendBroadcast(it1);}        }publicTestReceiver mr1 = new TestReceiver(); //创建监听器对象    class bt2listener implements OnClickListener{public void onClick(View v) {IntentFilter if1=new IntentFilter();if1.addAction(Intent.ACTION_EDIT);MainActivity.this.registerReceiver(mr1,if1);}        }    class bt3listener implements OnClickListener{public void onClick(View v) {MainActivity.this.unregisterReceiver(mr1);}        }    @Override    public boolean onCreateOptionsMenu(Menu menu) {        getMenuInflater().inflate(R.menu.activity_main, menu);        return true;    }}

这里要注意一点，在注销监听器的时候，一定要保证监听器存在，否则程序会报错！

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