標籤:android style blog http color io os ar java
背景知識:
當Android啟動時,會發出一個系統廣播,內容為ACTION_BOOT_COMPLETED,它的字串常量表示為android.intent.action.BOOT_COMPLETED。
只要在程式中“捕捉”到這個訊息,再啟動之即可。記住,Android架構說:Don‘t call me, I‘ll call you back。我們要做的是做好接收這個訊息的準備,而實現的手段就是實現一個BroadcastReceiver。
代碼解析:
1、介面Activity:SayHello.java
package com.ghstudio.BootStartDemo; import android.app.Activity; import android.os.Bundle; import android.widget.TextView; public class SayHello extends Activity { @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); TextView tv = new TextView(this); tv.setText("Hello. I started!"); setContentView(tv); } } 這段代碼很簡單,當Activity啟動時,建立一個TextView,用它顯示"Hello. I started!"字樣。
2、接收廣播訊息:BootBroadcastReceiver.java
package com.ghstudio.BootStartDemo; import android.content.BroadcastReceiver; import android.content.Context; import android.content.Intent; public class BootBroadcastReceiver extends BroadcastReceiver { static final String ACTION = "android.intent.action.BOOT_COMPLETED"; @Override public void onReceive(Context context, Intent intent) { if (intent.getAction().equals(ACTION)){ Intent sayHelloIntent=new Intent(context,SayHello.class); sayHelloIntent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK); context.startActivity(sayHelloIntent); } } } 該類派生自BroadcastReceiver,覆載方法onReceive中,檢測接收到的Intent是否符合BOOT_COMPLETED,如果符合,則啟動SayHello那個Activity。
3、設定檔:AndroidManifest.xml
<?xml version="1.0" encoding="utf-8"?> <manifest xmlns:android="http://schemas.android.com/apk/res/android" package="com.ghstudio.BootStartDemo" android:versionCode="1" android:versionName="1.0"> <application android:icon="@drawable/icon" android:label="@string/app_name"> <activity android:name=".SayHello" 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=".BootBroadcastReceiver"> <intent-filter> <action android:name="android.intent.action.BOOT_COMPLETED" /> </intent-filter> </receiver> </application> <uses-sdk android:minSdkVersion="3" /> <uses-permission android:name="android.permission.RECEIVE_BOOT_COMPLETED"></uses-permission> </manifest>
注意其中粗體字那一部分,該節點向系統註冊了一個receiver,子節點intent-filter表示接收 android.intent.action.BOOT_COMPLETED訊息。不要忘記配置 android.permission.RECEIVE_BOOT_COMPLETED許可權。
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1.要做的就是監聽系統發出的broadcast
public class FlorenceText extends BroadcastReceiver{ public void onReceive(Context context, Intent intent) { if(Intent.ACTION_BOOT_COMPLETED.equals(intent.getAction())){ start(context); } }}
2.在AndroidMenifest.xml裡還要將receiver加上, 並寫明程式的入口就是FlorenceTest
<application android:icon="@drawable/ic_launcher" android:label="@string/app_name" > <receiver android:name=".main.FlorenceTest" android:exported="true" android:process=":remote"> <intent-filter > <action android:name="android.intent.action.BOOT_COMPLETED" /> <category android:name="android.intent.category.HOME"/> </intent-filter> </receiver> </application>
這樣,程式就可以在開機時自動運行了
轉自:http://blog.csdn.net/wh_19910525/article/details/7921685
轉:android中APK開機自動運行