Android Studio开发基础之动态注册与注销BroadcastReceiver

1、New→Other→BroadcastReceiver

package com.example.lhb.startservice;import android.content.BroadcastReceiver;import android.content.Context;import android.content.Intent;import android.widget.Toast;public class MyReceiver extends BroadcastReceiver {    public MyReceiver() {    }    public static final String ACTION="com.example.lhb.startservice.intent.action.MyReceiver";//约定俗成，包名+intent.action+MyReceiver    @Override    public void onReceive(Context context, Intent intent) {        System.out.println("接收到了消息："+intent.getStringExtra("data"));        throw new UnsupportedOperationException("Not yet implemented");    }}

2、主程序

package com.example.lhb.startservice;import android.app.Activity;import android.content.Intent;import android.content.IntentFilter;import android.support.v7.app.ActionBarActivity;import android.os.Bundle;import android.view.Menu;import android.view.MenuItem;import android.view.View;import android.widget.EditText;import android.widget.Toast;public class MainActivity extends Activity implements View.OnClickListener {    private EditText inputText;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);    }    private MyReceiver receiver=null;    @Override    public void onClick(View v) {        switch (v.getId()){            case R.id.btnSendMsg:                Intent intent=new Intent(MyReceiver.ACTION);//隐式传递                intent.putExtra("data","GeoStorm");                break;            case R.id.btnReg:                if(receiver==null){                    receiver=new MyReceiver();                    registerReceiver(receiver,new IntentFilter(MyReceiver.ACTION));                }                break;            case R.id.btnUnReg:                if(receiver!=null) {                    unregisterReceiver(receiver);                    receiver = null;                }                break;        }    }}

注：只有注册了接收器后才能发送与接收到消息。