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); } } |
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); } } |
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 > |
希望本文所述对大家Android程序设计有所帮助。