How to fill progress bar in a specific amount of time?

Question

I have the following splash screen for my app:

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="#000000"
    >

    <ImageView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:id="@+id/imageView"
        android:src = "@drawable/timer_ic"
        android:layout_centerInParent="true" />

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:textAppearance="?android:attr/textAppearanceLarge"
        android:text="Timer"
        android:textColor="#FFFFFF"
        android:id="@+id/textView"
        android:layout_above="@+id/imageView"
        android:layout_centerHorizontal="true"
        android:layout_marginBottom="51dp" />

    <ProgressBar
        android:id="@+id/progress_bar"
        style="@android:style/Widget.ProgressBar.Horizontal"
        android:layout_width="250sp"
        android:layout_height="5sp"
        android:progress="1"
        android:layout_marginTop="82dp"
        android:max="3"
        android:indeterminate="false"
        android:layout_below="@+id/imageView"
        android:layout_centerHorizontal="true"
        android:progressDrawable="@drawable/custom_progress_bar"
        android:background="#808080"/>
</RelativeLayout>

The splash screen runs for 3 seconds before moving onto the next activity, which is controlled by this piece of code:

package com.awesomeapps.misael.timer;

import android.app.Activity;
import android.content.Intent;
import android.graphics.Color;
import android.os.Bundle;
import android.widget.ProgressBar;


public class SplashScreen extends Activity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        // TODO Auto-generated method stub
        super.onCreate(savedInstanceState);
        setContentView(R.layout.splash);

        Thread timer = new Thread(){
            public void run(){
                try{
                    sleep(3000);
                }catch(InterruptedException e){
                    e.printStackTrace();
                }finally{
                    Intent openMainActivity= new Intent("com.awesomeapps.timer.MAINACTIVITY");
                    startActivity(openMainActivity);
                }
            }
        };
        timer.start();
    }

    @Override
    protected void onPause() {
        // TODO Auto-generated method stub
        super.onPause();
        finish();
    }

}

Like I said and as you can see the splash screeb runs for 3 seconds (3000 milliseconds). You may also notice that the splash screen has a progress bar.

My question is:

How can I fill/load the progress bad in those 3 seconds that my splash screen is running?

I guess to give my app that sort of loading effect when it first starts by filling the progress bar.

Is it possible to do this?

Answer 1

I would get rid of yout timer Thread and instead use ValueAnimator to animate progress bar with duration of 3 seconds

ValueAnimator animator = ValueAnimator.ofInt(0, progressBar.getMax());
animator.setDuration(3000);
animator.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {
    @Override
    public void onAnimationUpdate(ValueAnimator animation){
        progressBar.setProgress((Integer)animation.getAnimatedValue());
    }
});
animator.addListener(new AnimatorListenerAdapter() {
    @Override
    public void onAnimationEnd(Animator animation) {
        super.onAnimationEnd(animation);
        // start your activity here
    }
});
animator.start();

Answer 2

you can use a countdown timer for that instead of Thread or Handler

 private CountDownTimer countDownTimer =
        new CountDownTimer(10000, 100) {
            public void onTick(long millisUntilFinished) {
                progressBar.setProgress(Math.abs((int) millisUntilFinished / 100 - 100));

                }
            }

            public void onFinish() {
               // you can do your action
            }

        };

to start count down timer

  countDownTimer.start();

Answer 3

    new Thread(new Runnable() {
        public void run() {
            doWork();
            startApp();
            finish();
        }
    }).start();
}

private void doWork() {
    for (int progress=1; progress<=100; progress+=1) {
        try {
            Thread.sleep(50);  // 5 seconds
            load.setProgress(progress);
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}

private void startApp() {
    Intent intent = new Intent(Splash.this, MainActivity.class);
    startActivity(intent);
}