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主题:BroadCastReceiver学习
BroadCastReceiver作用:
Broadcast Receiver用于接收并处理广播通知(broadcast announcements)。多数的广播是系统发起的,如地域变换、电量不足、来电来信等。程序也可以播放一个广播。程序可以有任意数量的 broadcast receivers来响应它觉得重要的通知。broadcast receiver可以通过多种方式通知用户:启动activity、使用NotificationManager、开启背景灯、振动设备、播放声音等,最典型的是在状态栏显示一个图标,这样用户就可以点它打开看通知内容。
注册广播的两种方式,它们有何不同?
答:首先写一个类要继承BroadcastReceiver,然后注册声明: 第一种:在清单文件中声明添加
>></receiver>
第二种在Activity中使用代码进行注册如:
IntentFilter filter = new IntentFilter(“android.provider.Telephony.SMS_RECEIVED”);//MyBroadcastReceiver是自定义的类,,需要继承BroadcastReceiver类MyBroadcastReceiver receiver = new MyBroadcastReceiver();registerReceiver(receiver.filter);
两种注册类型的区别是: 1)第一种是常驻型,也就是说当应用程序关闭后,如果有信息广播来,程序也会被系统调用自动运行。 2)第二种不是常驻型广播,也就是说广播跟随程序的生命周期。
实例一(第一种注册方式)
AndroidMainfest.xml源代码:
==”1″android:versionName=”1.0″ ><uses-sdkandroid:minSdkVersion=”14″android:targetSdkVersion=”14″ /><application=”@string/app_name”android:theme=”@style/AppTheme” ><activity>=>>>>
MainActivity.java源代码:
import android.app.Activity;import android.content.Intent;import android.os.Bundle;import android.view.View;import android.view.View.OnClickListener;import android.widget.Button;{Button btn;(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);btn = (Button) findViewById(R.id.button01);btn.setOnClickListener(new OnClickListener(){(View arg0) {// TODO Auto-generated method stubIntent intent = new Intent().setAction(“com.example.mybroadcastreceiver.hello”).putExtra(“flag”, “hello,小嘟嘟”);sendBroadcast(intent);}});}}
MyBroadcastReceiver.java源代码:
import android.content.BroadcastReceiver;import android.content.Context;import android.content.Intent;import android.media.MediaPlayer;import android.util.Log;{(Context context, Intent intent) {// 手机开机的广播if (intent.getAction().equals(“android.intent.action.BOOT_COMPLETED”)) {Log.i(“———-“,”BOOT_COMPLETED !!!!!!!!!!”);}//之前定义好的广播if(intent.getAction().equals(“com.example.mybroadcastreceiver.hello”)){Log.v(“———-“, intent.getStringExtra(“flag”));}//顺便来首歌曲《浩瀚》,带点气氛。MediaPlayer.create(context, R.raw.haohan).start();}}
实例二(第二种注册方式)
AndroidMainfest.xml源代码:
==”1″android:versionName=”1.0″ ><uses-sdkandroid:minSdkVersion=”14″android:targetSdkVersion=”14″ /><application=”@string/app_name”android:theme=”@style/AppTheme” ><activity>=></application> </manifest>
MainActivity.java源代码:
import android.app.Activity;import android.content.Intent;import android.content.IntentFilter;import android.os.Bundle;import android.util.Log;import android.view.View;import android.widget.Button;{MyBroadcastReceiver mbr;Button btn;(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);Button b1 = (Button) findViewById(R.id.button01);b1.setOnClickListener(new View.OnClickListener() {(View v) {Log.i(“click”, “OnClick”);mbr = new MyBroadcastReceiver();IntentFilter filter = new IntentFilter();filter.addAction(“android.provider.Telephony.SMS_RECEIVED”);registerReceiver(mbr, filter);sendBroadcast(new Intent(“android.provider.Telephony.SMS_RECEIVED”));}});}}
MyBroadcastReceiver.java源代码:
import android.content.BroadcastReceiver;import android.content.Context;import android.content.Intent;import android.media.MediaPlayer;import android.util.Log;{(Context context, Intent intent) {if (intent.getAction().equals(“android.provider.Telephony.SMS_RECEIVED”)) {Log.v(“————“,”接收到了广播!!!!!!!!!!!!!!!”);}}}
Focus on technology, enjoy life!—— QQ:804212028 浏览链接:
慢慢学会了长大。流转的时光,