实训7 BroadcastReceiver广播接收器类

一、【实训目的】

(1) BroadcastReceiver广播接收器类的实现步骤

(2) 有序广播的实际应用

(3）无序广播的应用

• 【实训内容和步骤】

1、创建一个无序广播，广播发送器发送一个信息：“我是FM广播台”，广播接收器接收到信息，并用弹出对话框显示接收到的信息。

实训步骤：

    





    haha
    Settings
    Hello world!
	发送广播
	

MainActivity.java

import android.os.Bundle;
import android.app.Activity;
import android.content.Intent;
import android.view.Menu;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
public class MainActivity extends Activity {
	private Button sendBroadcast;

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);
		final Intent intent=new Intent();
		intent.setAction("com.example.haha.MyBroadcastReceiver");
		sendBroadcast=(Button)findViewById(R.id.sendBroadcast);
		sendBroadcast.setOnClickListener(new OnClickListener() {
			public void onClick(View arg0) {
			sendBroadcast(intent);
			}
		});
	}

	@Override
	public boolean onCreateOptionsMenu(Menu menu) {
		// Inflate the menu; this adds items to the action bar if it is present.
		getMenuInflater().inflate(R.menu.main, menu);
		return true;
	}

}

MyBroadcastReceiver.java

import android.app.AlertDialog;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Toast;
public class MyBroadcastReceiver extends BroadcastReceiver{

	@Override
	public void onReceive(Context context, Intent intent) {
		// TODO Auto-generated method stub
		Toast.makeText(context, "我是FM广播台",
				Toast.LENGTH_LONG).show();
	}
}

AndroidMainfest.xml

运行结果截图：

2、创建一个有序广播，有1，2，3，4，5广播接收器，广播发送器发送一个信息：“我是有序广播”，按照顺序每个广播接收器接收到信息，并用弹出对话框显示接收到的信息。

实训步骤：

MainActivity.java

import android.os.Bundle;
import android.app.Activity;
import android.content.Intent;
import android.content.IntentFilter;
import android.view.Menu;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
public class MainActivity extends Activity {
	private Button sendBroadcast,sortedBroadcast;
	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);
		final Intent intent=new Intent();
		intent.setAction("com.example.ww.MyBroadcastReceiver");
		MyBroadcastReceiver myBroadcastReceiver=new MyBroadcastReceiver();
		IntentFilter intentFilter=new IntentFilter("com.example.ww.MyBroadcastReceiver");
		registerReceiver(myBroadcastReceiver, intentFilter);
		sendBroadcast=(Button)findViewById(R.id.sendBroadcast);
		sortedBroadcast=(Button)findViewById(R.id.sortedBroadcast);
		sendBroadcast.setOnClickListener(new OnClickListener() {
			public void onClick(View arg0) {
			sendBroadcast(intent);
			}
		});
		sortedBroadcast.setOnClickListener(new OnClickListener() {
			public void onClick(View v) {
			sendOrderedBroadcast(intent, null);
			}
		});

	}
	@Override
	public boolean onCreateOptionsMenu(Menu menu) {
		// Inflate the menu; this adds items to the action bar if it is present.
		getMenuInflater().inflate(R.menu.main, menu);
		return true;
	}
}

AndroidMainfest.xml

运行结果截图：

 

 附注：该专栏是博主上学时的实训项目，可供访客练习与参考。代码质量不是很好，但能实现，仅供参考！