Mon. Sep 26th, 2022

Activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:orientation="vertical" >

    <Button
        android:id="@+id/btnStartProgress"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Download File" />

</LinearLayout>

MainActivity.java

package androiindians.customlist;

import android.app.Activity;
import android.app.ProgressDialog;
import android.os.Bundle;
import android.os.Handler;
import android.widget.Button;
import android.view.View;
import android.view.View.OnClickListener;

public class MyAndroidAppActivity extends Activity {

    Button btnStartProgress;
    ProgressDialog progressBar;
    private int progressBarStatus = 0;
    private Handler progressBarHandler = new Handler();

    private long fileSize = 0;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);

        addListenerOnButton();

    }

    public void addListenerOnButton() {

        btnStartProgress = (Button) findViewById(R.id.btnStartProgress);
        btnStartProgress.setOnClickListener(
                new OnClickListener() {

                    @Override
                    public void onClick(View v) {

                        // prepare for a progress bar dialog
                        progressBar = new ProgressDialog(v.getContext());
                        progressBar.setCancelable(true);
                        progressBar.setMessage("File downloading ...");
                        progressBar.setProgressStyle(ProgressDialog.STYLE_HORIZONTAL);

// if we change style it will be spinner (circular)
progressBar.setProgressStyle(ProgressDialog.STYLE_SPINNER);

                        progressBar.setProgress(0);
                        progressBar.setMax(100);
                        progressBar.show();

                        //reset progress bar status
                        progressBarStatus = 0;

                        //reset filesize
                        fileSize = 0;

                        new Thread(new Runnable() {
                            public void run() {
                                while (progressBarStatus < 100) {

                                    // process some tasks
                                    progressBarStatus = doSomeTasks();

                                    // your computer is too fast, sleep 1 second
                                    try {
                                        Thread.sleep(1000);
                                    } catch (InterruptedException e) {
                                        e.printStackTrace();
                                    }

                                    // Update the progress bar
                                    progressBarHandler.post(new Runnable() {
                                        public void run() {
                                            progressBar.setProgress(progressBarStatus);
                                        }
                                    });
                                }

                                // ok, file is downloaded,
                                if (progressBarStatus >= 100) {

                                    // sleep 2 seconds, so that you can see the 100%
                                    try {
                                        Thread.sleep(2000);
                                    } catch (InterruptedException e) {
                                        e.printStackTrace();
                                    }

                                    // close the progress bar dialog
                                    progressBar.dismiss();
                                }
                            }
                        }).start();

                    }

                });

    }

    // file download simulator... a really simple
    public int doSomeTasks() {

        while (fileSize <= 1000000) {

            fileSize++;

            if (fileSize == 100000) {
                return 10;
            } else if (fileSize == 200000) {
                return 20;
            } else if (fileSize == 300000) {
                return 30;
            }
            // ...add your own

        }

        return 100;

    }

}

By Rajashekar

I’m (Rajashekar) a core Android developer with complimenting skills as a web developer from India. I cherish taking up complex problems and turning them into beautiful interfaces. My love for decrypting the logic and structure of coding keeps me pushing towards writing elegant and proficient code, whether it is Android, PHP, Flutter or any other platforms. You would find me involved in cuisines, reading, travelling during my leisure hours.

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