Focus on technology, enjoy life!—— QQ:804212028
瀏覽鏈接:http://blog.csdn.net/y18334702058/article/details/44624305
- 主題:BroadCastReceiver學習
BroadCastReceiver作用:
Broadcast Receiver用於接收並處理廣播通知(broadcast announcements)。多數的廣播是系統發起的,如地域變換、電量不足、來電來信等。程序也可以播放一個廣播。程序可以有任意數量的 broadcast receivers來響應它覺得重要的通知。broadcast receiver可以通過多種方式通知用戶:啓動activity、使用NotificationManager、開啓背景燈、振動設備、播放聲音等,最典型的是在狀態欄顯示一個圖標,這樣用戶就可以點它打開看通知內容。
註冊廣播的兩種方式,它們有何不同?
答:首先寫一個類要繼承BroadcastReceiver,然後註冊聲明:
第一種:在清單文件中聲明添加
<receiver android:name=".MyBroadcastReceiver">
<intent-filter>
<action android:name="com.example.mybroadcastreceiver.hello"/>
</intent-filter>
</receiver>
第二種在Activity中使用代碼進行註冊如:
IntentFilter filter = new IntentFilter("android.provider.Telephony.SMS_RECEIVED");
//MyBroadcastReceiver是自定義的類,需要繼承BroadcastReceiver類
MyBroadcastReceiver receiver = new MyBroadcastReceiver();
registerReceiver(receiver.filter);
兩種註冊類型的區別是:
1)第一種是常駐型,也就是說當應用程序關閉後,如果有信息廣播來,程序也會被系統調用自動運行。
2)第二種不是常駐型廣播,也就是說廣播跟隨程序的生命週期。
實例一(第一種註冊方式)
AndroidMainfest.xml源代碼:
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.mybroadcastreceiver"
android:versionCode="1"
android:versionName="1.0" >
<uses-sdk
android:minSdkVersion="14"
android:targetSdkVersion="14" />
<application
android:allowBackup="true"
android:icon="@drawable/ic_launcher"
android:label="@string/app_name"
android:theme="@style/AppTheme" >
<activity
android:name="com.example.mybroadcastreceiver.MainActivity"
android:label="@string/app_name" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<receiver android:name=".MyBroadcastReceiver">
<intent-filter>
<action android:name="com.example.mybroadcastreceiver.hello"/>
</intent-filter>
</receiver>
</application>
</manifest>
MainActivity.java源代碼:
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;
public class MainActivity extends Activity {
Button btn;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
btn = (Button) findViewById(R.id.button01);
btn.setOnClickListener(new OnClickListener(){
@Override
public void onClick(View arg0) {
// TODO Auto-generated method stub
Intent intent = new Intent().setAction("com.example.mybroadcastreceiver.hello")
.putExtra("flag", "hello,小嘟嘟");
sendBroadcast(intent);
}
});
}
}
MyBroadcastReceiver.java源代碼:
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.media.MediaPlayer;
import android.util.Log;
public class MyBroadcastReceiver extends BroadcastReceiver{
@Override
public void onReceive(Context context, Intent intent) {
// 手機開機的廣播
if (intent.getAction().equals("android.intent.action.BOOT_COMPLETED")) {
Log.i("----------","BOOT_COMPLETED !!!!!!!!!!");
}
//之前定義好的廣播
if(intent.getAction().equals("com.example.mybroadcastreceiver.hello")){
Log.v("----------", intent.getStringExtra("flag"));
}
//順便來首歌曲《浩瀚》,帶點氣氛。
MediaPlayer.create(context, R.raw.haohan).start();
}
}
實例二(第二種註冊方式)
AndroidMainfest.xml源代碼:
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.mybroadcastreceiver"
android:versionCode="1"
android:versionName="1.0" >
<uses-sdk
android:minSdkVersion="14"
android:targetSdkVersion="14" />
<application
android:allowBackup="true"
android:icon="@drawable/ic_launcher"
android:label="@string/app_name"
android:theme="@style/AppTheme" >
<activity
android:name="com.example.mybroadcastreceiver.MainActivity"
android:label="@string/app_name" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>
</manifest>
MainActivity.java源代碼:
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;
public class MainActivity extends Activity {
MyBroadcastReceiver mbr;
Button btn;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Button b1 = (Button) findViewById(R.id.button01);
b1.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(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源代碼:
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.media.MediaPlayer;
import android.util.Log;
public class MyBroadcastReceiver extends BroadcastReceiver{
@Override
public void onReceive(Context context, Intent intent) {
if (intent.getAction().equals("android.provider.Telephony.SMS_RECEIVED")) {
Log.v("------------",
"接收到了廣播!!!!!!!!!!!!!!!");
}
}
}
Focus on technology, enjoy life!—— QQ:804212028
瀏覽鏈接:http://blog.csdn.net/y18334702058/article/details/44624305