学习android的Broadcast，笔记记录于此。

BroadCastRecevier用于接受其他应用发送的广播.

BroadCastReceiver工作，需要2步。

• 创建Broadcast Recevier.

• 注册Braodcast Recevier.

参考链接

https://www.tutorialspoint.com/android/android_broadcast_receivers.htm

http://blog.csdn.net/mr_dsw/article/details/51394350

创建BroadcastReceiver

Android stuido创建project, 名称broadcastTest。

继承BroadcastReceiver，用于接收广播。

MyReceiver.java

package com.example.tony.broadcasttest;import android.content.BroadcastReceiver;import android.content.Context;import android.content.Intent;import android.util.Log;import android.widget.Toast;public class MyReceiver extends BroadcastReceiver {    // 接受到广播调用    @Override    public void onReceive(Context context, Intent intent) {        // TODO: This method is called when the BroadcastReceiver is receiving        // an Intent broadcast.//        throw new UnsupportedOperationException("Not yet implemented");        Log.i("receive", "onReceive");        Toast.makeText(context, "intent Detected", Toast.LENGTH_LONG).show();    }}

注册receiver

使用标签注册broadcastReceiver。

AndroidManifest.xml

布局文件

布局文件中定义一个按键用于发送广播

activity_main.xml

MainActivity

按键按下，通过sendBroadcast()发送自己定义的广播。

MainActivity.java

package com.example.tony.broadcasttest;import android.content.Intent;import android.content.IntentFilter;import android.support.v7.app.AppCompatActivity;import android.os.Bundle;import android.util.Log;import android.view.View;import android.widget.Button;public class MainActivity extends AppCompatActivity {    Button sendBroadcast;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        sendBroadcast = (Button) findViewById(R.id.send_broadcast);        // 按键按下，发送广播        sendBroadcast.setOnClickListener(new View.OnClickListener() {            @Override            public void onClick(View v) {               broadcastIntent(v);            }        });        // 手动注册广播，在AndroidManifest.xml中注册了就不需要手动注册        /*        IntentFilter intentFilter = new IntentFilter();        intentFilter.addAction("com.example.CUSTOM_INTENT");        registerReceiver(new MyReceiver(), intentFilter);        */    }    public void broadcastIntent(View view) {        Intent intent = new Intent();        // 发送自己广播，名称自己定义，只要在AndroidManifest.xmL中注册，让Receive接受即可。        intent.setAction("com.example.CUSTOM_INTENT");        sendBroadcast(intent);        Log.i("sendBraodcast", "braodcastintent");    }}

这个demo只是无序广播的demo。对于有序广播，后面再分析。

Tony Liu

2017-3-3, Shenzhen