progress bar - How to show a ProgressBar example with percentage in Android

Question

I have a task to add a ProgressBar with percentage values on it to show a value when the user wants to predict something. I'm not using ProgressDialog since it's now deprecated. Here, the percentage value depends on how long it is from start a request until it's completed. I'm using Volley to fetch data from server.

Here goes a sample image of what I'm trying to achieve:

i already did like this

i have implement a horizontal progress bar inside an alert dialog (i'm using this way because progress dialog is deprecated). i want to setProgress the progress bar like this.

public View onCreateView(LayoutInflater inflater, ViewGroup container,
                         Bundle savedInstanceState) {
    // Inflate the layout for this fragment
    view =  inflater.inflate(R.layout.fragment_result_prediction, container, false);
    predictProgress = (ProgressBar) view.findViewById(R.id.progressbarPredict);
    AlertDialog.Builder(view.getContext());
    builder.setCancelable(false); // if you want user to wait for some process to finish,
    View v = inflater.inflate(R.layout.layout_loading_dialog, null);
    builder.setView(v);
    final AlertDialog dialog = builder.create();
    submitPredictPlant.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
                dialog.show();
                predictProgress.setProgress(25);
                predictProgress.setProgress(50);
                predictProgress.setProgress(75);
                predictProgress.setProgress(100);
                dialog.dismiss();

i want to dismiss the dialog when the progress is 100. but this give an error like

java.lang.NullPointerException: Attempt to invoke virtual method 'void android.widget.ProgressBar.setProgress(int)' on a null object reference

i already refer the progress bar from layout_loading_dialog that is used in builder.setview.

here is the layout_loading_dialog.xml

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical"
android:padding="20dp">
<TextView
    android:layout_width="wrap_content"
    android:layout_height="match_parent"
    android:layout_weight="4"
    android:gravity="center"
    android:text="Please wait! This may take a moment." />

<ProgressBar
    android:layout_width="match_parent"
    android:id="@+id/progressbarPredict"
    android:layout_height="wrap_content"
    android:layout_weight="1"
    style="?android:attr/progressBarStyleHorizontal"/>

Answer 1

Following is the code to create a progress dialog with percentage like in the picture.

int status = 0;
Handler handler = new Handler();

public void showDialog(Activity activity, String msg) {
    final Dialog dialog = new Dialog(activity);
    dialog.requestWindowFeature(Window.FEATURE_NO_TITLE);
    dialog.setCancelable(false);
    dialog.setContentView(R.layout.dialog);

    final ProgressBar text = (ProgressBar) dialog.findViewById(R.id.progress_horizontal);
    final TextView text2 = dialog.findViewById(R.id.value123);


    new Thread(new Runnable() {
        @Override
        public void run() {
            while (status < 100) {

                status += 1;

                try {
                    Thread.sleep(200);
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }

                handler.post(new Runnable() {
                    @Override
                    public void run() {

                        text.setProgress(status);
                        text2.setText(String.valueOf(status));

                        if (status == 100) {
                            dialog.dismiss();
                        }
                    }
                });
            }
        }
    }).start();


    dialog.show();

    Window window = dialog.getWindow();
    window.setLayout(WindowManager.LayoutParams.MATCH_PARENT, WindowManager.LayoutParams.WRAP_CONTENT);
}

Layout File : dialog

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:orientation="vertical">

<ProgressBar
    android:id="@+id/progress_horizontal"
    style="?android:attr/progressBarStyleHorizontal"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:padding="16dp" />

<RelativeLayout
    android:layout_width="wrap_content"
    android:paddingLeft="20dp"
    android:layout_margin="16dp"
    android:layout_height="wrap_content">

    <TextView
        android:id="@+id/value123"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
      />

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_toRightOf="@id/value123"
        android:text="%" />
</RelativeLayout>

Result :

With Asyntask :

int status = 0;
Handler handler = new Handler();
Dialog dialog;
ProgressBar text;
TextView text2;

public void showDialog(Activity activity, String msg) {
    dialog = new Dialog(activity);
    dialog.requestWindowFeature(Window.FEATURE_NO_TITLE);
    dialog.setCancelable(false);
    dialog.setContentView(R.layout.dialog);

    text = (ProgressBar) dialog.findViewById(R.id.progress_horizontal);
    text2 = dialog.findViewById(R.id.value123);


    dialog.show();

    Window window = dialog.getWindow();
    window.setLayout(WindowManager.LayoutParams.MATCH_PARENT, WindowManager.LayoutParams.WRAP_CONTENT);

    new Thread(new Runnable() {
        @Override
        public void run() {
            while (status < 100) {

                status += 1;

                try {
                    Thread.sleep(200);
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }

                handler.post(new Runnable() {
                    @Override
                    public void run() {

                        text.setProgress(status);
                        text2.setText(String.valueOf(status));

                        if (status == 100) {
                            status = 0;
                        }
                    }
                });
            }
        }
    }).start();

}


private class AsyncTaskRunner extends AsyncTask<String, String, String> {

    @Override
    protected String doInBackground(String... params) {


        // it will fill the progress bar to 100
        // and will refill again and again



        /*
         *
         * Make your api call here
         * MAke request to API and return data when response comes
         *
         *
         * */

        /*
        * 
        * I have just add sleep to thead for example purposes
        * 
        * */
        try {
            Thread.sleep(30 * 1000);
        } catch (InterruptedException e) {
            e.printStackTrace();
        }

        return resp;
    }


    @Override
    protected void onPostExecute(String result) {


        /*
         *
         *
         * Do your processing there on the api result
         *
         *
         * */
        dialog.dismiss();
    }


    @Override
    protected void onPreExecute() {
        showDialog(MainActivity.this,"");

    }


    @Override
    protected void onProgressUpdate(String... text) {

    }
}

For start the Asyntask :

    new AsyncTaskRunner().execute("fs");

I am not sure if this is the best approach