Android -- 简单广播接收与发送（1）

1. 效果图

2. 实现代码

　layout.xml

 <Button
        android:id="@+id/testBtn"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="@string/hello_world" />

MainActivity.java

public static final String MY_ACTION = "iflab.test.MY_ACTION"; // 自定义ACTION

	private Button testBtn;

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);

		testBtn = (Button) findViewById(R.id.testBtn);
		testBtn.setOnClickListener(new OnClickListener() {

			@Override
			public void onClick(View v) {
				// TODO Auto-generated method stub
				Intent intent = new Intent();
				intent.setAction(MY_ACTION);
				intent.putExtra("message", "来自于广播的消息！"); // 设置广播的消息
				sendBroadcast(intent);

			}
		});

	}

testBroadcastReceiver.java

public class testBroadcastReceiver extends BroadcastReceiver {

	// context 上下文对象 intent 接收的意图对象
	@Override
	public void onReceive(Context context, Intent intent) {
		// TODO Auto-generated method stub

		String str;
		str = "接收到的广播消息为：" + intent.getStringExtra("message"); // 接收消息
		Toast.makeText(context, str, Toast.LENGTH_SHORT).show();

	}

}

配置文件中需要填写的信息

 <receiver android:name="testBroadcastReceiver" >
            <intent-filter>
                <action android:name="iflab.test.MY_ACTION" />
            </intent-filter>
        </receiver>

3. 说明

 <action android:name="iflab.test.MY_ACTION" />  为你在 MainActivity 中定义的常量

<receiver android:name="testBroadcastReceiver" >   name 的值为 你要接收广播的时候所启动的类  testBroadcastReceiver