本文实例讲述了Android使用BroadcastReceiver实现手机开机之后显示画面的功能。分享给大家供大家参考,具体如下:
在此例中介绍了怎样使用BroadcastRececiver。使用BroadcastReceiver需要继承这个类,并且重写public void onReceiver(Context context,Intent intent)这个方法,在这个方法中来添加想要实现的功能。
下面这个例子是实现android手机开机之后,所自动显示的画面,通过ImageView来引入一张图片,通过TextView来显示一句问候语。在每次手机开机之后都会自动显示出来。
具体程序如下所示:
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import android.app.Activity;
import android.os.Bundle;
import android.widget.ImageView;
import android.widget.TextView;
public class A01Activity extends Activity {
private TextView tv;
private ImageView iv;
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super .onCreate(savedInstanceState);
setContentView(R.layout.main);
tv=(TextView)findViewById(R.id.tv);
tv.setText( "欢迎光临168855" );
iv=(ImageView)findViewById(R.id.iv);
iv.setBackgroundResource(R.drawable.a);
}
}
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然后再在同一个package中写一个类来继承BroadcastReceiver,并重写public void onReceiver(Context context, Intent intent)这个方法,程序如下:
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import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
public class A01_01 extends BroadcastReceiver{
@Override
public void onReceive(Context arg0, Intent arg1) {
// TODO Auto-generated method stub
Intent i= new Intent(arg0,A01Activity. class );
i.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
arg0.startActivity(i);
}
}
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为了捕捉系统开机所广播的开机ACTION信息,必须在AndroidManifest.xml里的<application>当中设置<receiver>标记,并将其中的intent-filter名称指定为Android.intent.action.BOOT_COMPLETED。其中AndroidManifest.xml如下所示:
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<? xml version = "1.0" encoding = "utf-8" ?>
< manifest xmlns:android = "http://schemas.android.com/apk/res/android"
package = "com.my.a01"
android:versionCode = "1"
android:versionName = "1.0" >
< uses-sdk android:minSdkVersion = "10" />
< application
android:icon = "@drawable/ic_launcher"
android:label = "@string/app_name" >
< activity
android:name = ".A01Activity"
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 = "A01_01" >
< intent-filter >
< action android:name = "android.intent.action.BOOT_COMPLETED" ></ action >
< category android:name = "android.intent.category.HOME" ></ category >
</ intent-filter >
</ receiver >
</ application >
</ manifest >
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希望本文所述对大家Android程序设计有所帮助。