I am trying to set Timer and tried this logic, but it does not run?

while running this code, It directly set a text to 0 not decreasing it from 30 to 0 with an interval of 1 second.

JAVA CODE

public void LoadCounter() {

for (int i = 30; i > -1; i--) {
final int counter = i;

new Handler().postDelayed(new Runnable() {
@Override
public void run() {
txtview.setText("" + counter);
Log.d("test1", "" + counter);
}
}, 1000);


}
}


Text view that set value while runtime.

XML CODE

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".MainActivity">

<TextView
android:id="@+id/txtview"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textSize="30sp"
android:textColor="#000"
android:layout_centerInParent="true"
android:textStyle="bold"/>
<Button
android:id="@+id/btn"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="@+id/txtview"
android:layout_centerInParent="true"
android:text="START COUNT"
android:textStyle="bold"
android:textSize="20sp"/>


I know CountdownTimer method is an option but I am trying to solve in this way So
any Changes in above code or explanation is much appreciated.

This is my first time asking a question on StackOverflow and I hope this is a right way to ask and thank you for any help in advance.

Handler

Runnable

3 Answers
3

and we invent wheel again :)

public void LoadCounter() {
Thread timer = new Thread(){
public void run(){
try{
for (int i = 30; i>= 0; i--){
sleep(1000);
final int timer = i;
runOnUiThread(new Runnable() {
public void run() {
txt.setText(String.valueOf(timer));
}
});
};
}
catch (InterruptedException e) {
e.printStackTrace();
}
}
};
timer.start();
}


new CountDownTimer(30000, 1000) {

public void onTick(long millisUntilFinished) {
txtview.setText((millisUntilFinished / 1000) + "");
}

public void onFinish() {
// todo
}

}.start();


https://developer.android.com/reference/android/os/CountDownTimer

And I figured it out on my own and it's working perfectly.

public void LoadCounter() {

for (int i = 0; i <= 30; i++) {
final int counter = (30 - i);
int TIME = 1000 * i;


new Handler().postDelayed(new Runnable() {
@Override
public void run() {
txtview.setText(String.valueOf(counter));
}
}, TIME);


}
}


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