当使用单击平板电脑中的按钮时,我需要启用 LED 闪烁。在这里,我使用以下代码创建了一个示例应用程序。此代码在移动设备(HTC Sensation)中运行良好。当我对平板电脑使用相同的代码时,它不起作用。为什么会发生这种情况,Log Cat 中没有错误消息。我用的是东芝 Thrive AT100 平板电脑。
LED_Blinking_Activity.java
public class LED_Blinking_Activity extends Activity {
Button on, off;
int LED_NOTIFICATION_ID = 0;
Context context;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_led__blinking_);
on = (Button) findViewById(R.id.button1);
off = (Button) findViewById(R.id.button2);
final Vibrator vibe = (Vibrator) this
.getSystemService(VIBRATOR_SERVICE);
on.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
// TODO Auto-generated method stub
NotificationManager nm = (NotificationManager) getSystemService(NOTIFICATION_SERVICE);
Notification notif = new Notification();
notif.ledARGB = 0xFFff0000; // Green color 0xFF00FF00
notif.flags = Notification.FLAG_SHOW_LIGHTS;
notif.ledOnMS = 100;
notif.ledOffMS = 1000;
nm.notify(LED_NOTIFICATION_ID, notif);
vibe.vibrate(50); // 50 is time in ms
}
});
off.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
// TODO Auto-generated method stub
ClearLED();
}
});
}
private void ClearLED() {
NotificationManager nm = (NotificationManager) getSystemService(NOTIFICATION_SERVICE);
nm.cancel(LED_NOTIFICATION_ID);
}
private Runnable mClearLED_Task = new Runnable() {
public void run() {
synchronized (LED_Blinking_Activity.this) {
ClearLED();
}
}
};
}
activity_led_闪烁的.xml
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent" >
<Button
android:id="@+id/button1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentTop="true"
android:layout_centerHorizontal="true"
android:layout_marginTop="45dp"
android:text="Turn on LED" />
<Button
android:id="@+id/button2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignRight="@+id/button1"
android:layout_centerVertical="true"
android:text="Turn o LED" />
</RelativeLayout>