1./res/layout/activity_main.xml
2.MainActivity.java
package tw.android;
import android.app.Activity;
import android.app.Notification;
import android.app.NotificationManager;
import android.os.AsyncTask;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
public class MainActivity extends Activity {
private NotificationManager notificationManager;
private Notification notification;
private boolean indeterminate = true; // true-開啟, false-關閉
private int msInterval = 850; // 閃爍間隔時間(毫秒)
private Button btStart, btStop;
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
notificationManager = (NotificationManager) getSystemService(NOTIFICATION_SERVICE);
notification = new Notification();
/* 啟用通知的led燈 */
notification.flags = Notification.FLAG_SHOW_LIGHTS;
/*notification閃亮間隔時間 */
notification.ledOnMS=100;
notification.ledOffMS=100;
btStart = (Button) findViewById(R.id.btStart);
btStop = (Button) findViewById(R.id.btStop);
/* 開始 */
btStart.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
indeterminate = true;// 設為開啟
new TwoColorBlink().execute(); // 執行LED燈閃爍
btStart.setEnabled(false); // 開始按鈕-不可按
btStop.setEnabled(true); // 關閉按鈕-可按
}
});
/* 停止 */
btStop.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
indeterminate = false;// 設為關閉
notificationManager.cancel(0); // 關閉notificationManager
btStart.setEnabled(true); // 開始按鈕-可按
btStop.setEnabled(false); // 關閉按鈕-不可按
}
});
}
@Override
protected void onPause() {
indeterminate = false; // 設為關閉
notificationManager.cancel(0); // 關閉notificationManager
super.onPause();
}
private class TwoColorBlink extends AsyncTask<Void, Void, Void> {
private int counter = 0; // 初始化次數
@Override
protected void onPreExecute() {
}
@Override
protected Void doInBackground(Void... arg0) {
try {
synchronized (this) { //同一時間只有一個Thread執行
notification.ledARGB = 0xFFFF0000;// 設定LED燈開始顏色
while (indeterminate) { //重複閃爍
notificationManager.notify(0, notification);//開啟notificationManager
this.wait(msInterval); //閃爍間隔時間
notificationManager.cancel(0); //關閉notificationManager
if (counter++ % 2 == 0) {
notification.ledARGB = 0xFF00FF00; //切換綠色
} else {
notification.ledARGB = 0xFF0000FF; //切換藍色
}
}
}
} catch (InterruptedException e) {
e.printStackTrace();
}
return null;
}
@Override
protected void onPostExecute(Void result) {
}
}
}
檔按下載:https://github.com/terryyamg/LedTest
參考來源:http://www.41post.com/4706/programming/android-creating-a-two-color-led-notification
