广播简单学习Demo

package com.amaker.broadcast;

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;
/**
 * 1，点击按钮发送一个广播
 * 2，注册广播时有两种注册：一，在配置文件中静态注册 二、在代码中动态注册
 * 注意：注册方法写在：onResume里面，注销方法写在：onPause里面
 *
 */
public class MainActivity extends Activity {
    private Button btn_send;
    public static final String MY_ACTION = "com.amaker.broadcast.MY_ACTION";
    MyReceiver r = new MyReceiver();
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);

        btn_send = (Button) findViewById(R.id.button1);

        btn_send.setOnClickListener(new OnClickListener() {

            @Override
            public void onClick(View v) {
                send();
            }
        });
    }
    //发送一个广播
    void send(){
        Intent intent = new Intent(MY_ACTION);
        String msg = "我给你发了一个广播，是否收到？";
        intent.putExtra("msg", msg);
        sendBroadcast(intent);
    }
    //动态注册广播
    @Override
    protected void onResume() {
        super.onResume();
        IntentFilter filter = new IntentFilter();
        filter.addAction(MY_ACTION);
        registerReceiver(r, filter);
    }
    //注销广播
    @Override
    protected void onPause() {
        super.onPause();
        unregisterReceiver(r);
    }
}

package com.amaker.broadcast;

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

public class MyReceiver extends BroadcastReceiver{

    @Override
    public void onReceive(Context context, Intent intent) {
        String msg = intent.getStringExtra("msg");
        //收到广播，简单Toast显示一下
        Toast.makeText(context, msg, Toast.LENGTH_LONG).show();
    }

}

AndroidManifest.xml:

"1.0" encoding="utf-8"?>
""
      package="com.amaker.broadcast"
      android:versionCode="1"
      android:versionName="1.0">
    "8" />

    "@drawable/icon" android:label="@string/app_name">
        ".MainActivity"
                  android:label="@string/app_name">

                "android.intent.action.MAIN" />
                "android.intent.category.LAUNCHER" />