السبت، 7 يونيو 2014

Restart CountDownTimer

Refer to my old exercise of "Count Down Timer", it is a one-shot CountDownTimer. In some case you want to reset/restart the CountDownTimer, you have to cancel the old one if exist, otherwise both old and new CountDownTimer will run together.

Example:


MainActivity.java
package com.example.androidcountdowntimer;

import android.app.Activity;
import android.os.Bundle;
import android.os.CountDownTimer;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.TextView;

public class MainActivity extends Activity {

TextView myCounter;
Button btnStart;
CountDownTimer countDownTimer;

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);

myCounter = (TextView) findViewById(R.id.mycounter);
btnStart = (Button) findViewById(R.id.start);
btnStart.setOnClickListener(new OnClickListener() {

@Override
public void onClick(View v) {

//cancel the old countDownTimer
if(countDownTimer!=null){
countDownTimer.cancel();
}

countDownTimer = new CountDownTimer(10000, 1000) {

@Override
public void onFinish() {
myCounter.setText("Finished!");
}

@Override
public void onTick(long millisUntilFinished) {
myCounter.setText("Millisecond Until Finished: "
+ String.valueOf(millisUntilFinished));
}

};

countDownTimer.start();
}
});

}

}

<LinearLayout 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"
android:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
android:orientation="vertical"
tools:context="com.example.androidcountdowntimer.MainActivity" >

<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center_horizontal"
android:autoLink="web"
android:text="http://android-er.blogspot.com/"
android:textStyle="bold" />

<Button
android:id="@+id/start"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="Start CountDownTimer" />
<TextView
android:id="@+id/mycounter"
android:layout_width="fill_parent"
android:layout_height="wrap_content" />

</LinearLayout>

Next:
- Use CountDownTimer to do something repeatly, updating custom view; handle CountDownTimer in custom view.
- Another approach to use CountDownTimer to do something repeatly; handle CountDownTimer in MainActivity, custom view handle display only.

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