ANDROID APP

60 บทที่ 3 เธรด เซอร์วิส รีซีฟเวอร์ และการแจ้งเตือน
ชุดคำสั่งที่ 3.6 src/com/cookbook/background_timer/BackgroundTimer.java
package com.cookbook.background_timer;
import android.app.Activity;
import android.os.Bundle;
import android.os.Handler;
import android.os.SystemClock;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;
public class BackgroundTimer extends Activity {
//keep track of button presses, a main thread task
private int buttonPress=0;
TextView mButtonLabel;
//counter of time since app started, a background task
private long mStartTime = 0L;
private TextView mTimeLabel;
//Handler to handle the message to the timer task
private Handler mHandler = new Handler();
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
if (mStartTime == 0L) {
mStartTime = SystemClock.uptimeMillis();
mHandler.removeCallbacks(mUpdateTimeTask);
mHandler.postDelayed(mUpdateTimeTask, 100);
}
mTimeLabel = (TextView) findViewById(R.id.text);
mButtonLabel = (TextView) findViewById(R.id.trigger);
}
Button startButton = (Button) findViewById(R.id.trigger);
startButton.setOnClickListener(new View.OnClickListener() {
public void onClick(View view){
mButtonLabel.setText("Pressed " + ++buttonPress
+ " times");
}
});