Develop Reference

Two activities using the same fragment - problem

Two activities using the same fragment. The fragment has a text view.
Main activity writes “message 1” into the text view and it shows up.
A button in the main activity launches the second activity “for result”.
The Second activity writes “message 2” into the text view and it shows up.
A button in the second activity does set Result Activity.RESULT_OK and then finish().
The main activity gets the “onActivityResult” Result OK and writes “message 3” into the text view.
However “Message 3” does not show up in the text view. Instead “message 1” shows up.
public class MainActivity extends AppCompatActivity {
private static Context context;
private static Button btn_main;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
context = this;
btn_main = findViewById(R.id.btn_main);
FragmentDisplay.setMessage1("Message 1");
btn_main.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
Intent intent = new Intent(MainActivity.this, SecondActivity.class);
secondactivityLauncher.launch(intent);
}
});
}
ActivityResultLauncher<Intent> secondactivityLauncher = registerForActivityResult(
new ActivityResultContracts.StartActivityForResult(),
new ActivityResultCallback<ActivityResult>() {
#Override
public void onActivityResult(ActivityResult result) {
if (result.getResultCode() == Activity.RESULT_OK) {
FragmentDisplay.setMessage1("Message 3");
}
}
});
public static Context getContext(){
return context;
}
}
public class SecondActivity extends AppCompatActivity {
private static Button btn_second;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_second);
btn_second = findViewById(R.id.btn_second);
FragmentDisplay.setMessage1("Message 2");
btn_second.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
Intent intent = getIntent();
setResult(Activity.RESULT_OK, intent);
finish();
}
});
}
}
public class FragmentDisplay extends androidx.fragment.app.Fragment {
private static TextView textView1;
public FragmentDisplay() {
// Required empty public constructor
}
RecyclerView mRecyclerView;
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
// Inflate the layout for this fragment
View view = inflater.inflate(R.layout.display_fragment, null);
textView1 = (TextView)view.findViewById(R.id.tv1);
return view;
}
public static void setMessage1(String str){
textView1.setText(str);
}
} // end of class
//activity_main.xml
<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=".main.MainActivity">
<fragment
android:id="#+id/display_fragment"
android:name="ddi.pos.display.FragmentDisplay"
android:layout_width="700dp"
android:layout_height="180dp"
android:background="#00CC00"
android:layout_alignParentLeft="true"
android:layout_alignParentTop="true"
android:layout_marginTop="80dp" />
<Button
android:id="#+id/btn_main"
android:layout_below="#+id/display_fragment"
android:layout_marginTop="100dp"
android:layout_marginLeft="50dp"
android:layout_width="200dp"
android:layout_height="200dp"
android:background="#FFFFFF00"
android:textSize="25sp"
android:text="Start Second Activity"
/>
//second_activity.xml
<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=".main.MainActivity">
<fragment
android:id="#+id/display_fragment"
android:name="ddi.pos.display.FragmentDisplay"
android:layout_width="700dp"
android:layout_height="180dp"
android:background="#00CC00"
android:layout_alignParentLeft="true"
android:layout_alignParentTop="true"
android:layout_marginTop="80dp" />
<Button
android:id="#+id/btn_second"
android:layout_below="#+id/display_fragment"
android:layout_marginTop="100dp"
android:layout_marginLeft="300dp"
android:layout_width="200dp"
android:layout_height="200dp"
android:background="#000000"
android:textSize="25sp"
android:text="Finish Second Activity"
/>
//display_fragment.xml
<RelativeLayout 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:background="#CC5500"
>
<TextView android:id="#+id/tv1"
android:background="#0055FF"
android:layout_height="60dp"
android:layout_width="600dp"
android:text=""
android:layout_marginLeft="30dp"
android:layout_marginTop="30dp"
android:textSize="20dp"
android:textColor="#ff000000"
/>

Caveat: I suspect that what you posted is not what you actually want to do, but a workaround of some kind so this answer may or may not actually address your use-case. It does, however, produce the behavior you asked for in the question. You said you are not trying to send data between activities, but you want the message in the first activity to change in response to actions in the second activity which implies information may be shared.
Main Answer:
The example below, using a shared ViewModel between Activity and Fragment and using data transfer across activities using intents has the behavior you describe in your question.
The ViewModel allows sharing of data between the Activity and Fragment, since the Fragment can observe the LiveData and respond when the activity changes it. Since the question calls startActivityForResult and handles the result, I used those to handle passing data back to change the message.
MainActivity.java
public class MainActivity extends AppCompatActivity {
ActivityResultLauncher<Intent> secondActivityLauncher = registerForActivityResult(
new ActivityResultContracts.StartActivityForResult(),
new ActivityResultCallback<ActivityResult>() {
#Override
public void onActivityResult(ActivityResult result) {
if (result.getResultCode() == Activity.RESULT_OK) {
// as you indicated:
//viewModel.setMessage("Message 3");
// or like this if you sent data
Intent data = result.getData();
if( data != null ) {
Bundle extras = data.getExtras();
if( extras != null ) {
String msg = extras.getString("response");
viewModel.setMessage(msg);
}
}
}
}
});
private MainViewModel viewModel;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
viewModel = new ViewModelProvider(this).get(MainViewModel.class);
// Always initialize the message to "Message 1"
viewModel.setMessage("Message 1");
Button btn = findViewById(R.id.btn_main);
btn.setOnClickListener(view -> {
Intent intent = new Intent(MainActivity.this, SecondActivity.class);
intent.putExtra("message", "Message 2");
secondActivityLauncher.launch(intent);
});
}
}
SecondActivity.java
public class SecondActivity extends AppCompatActivity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_second);
// This ViewModel instance is "not" the same instance as the one from MainActivity, it is
// just to facilitate communication between the Activity and Fragment
MainViewModel viewModel = new ViewModelProvider(this).get(MainViewModel.class);
// as you had it with hard-coded message 2
// viewModel.setMessage("Message 2");
// or like this if you sent the message
Intent i = getIntent();
Bundle b = i.getExtras();
if( b != null ) {
String msg = b.getString("message");
viewModel.setMessage(msg);
}
Button btn = findViewById(R.id.btn_second);
btn.setOnClickListener(view -> {
Intent intent = new Intent();
intent.putExtra("response", "Message 3");
setResult(Activity.RESULT_OK, intent);
finish();
});
}
}
MainViewModel.java
public class MainViewModel extends ViewModel {
private final MutableLiveData<String> message_to_display = new MutableLiveData<>();
LiveData<String> message() { return message_to_display; }
void setMessage(String msg) {
message_to_display.postValue(msg);
}
}
DisplayFragment.java
public class DisplayFragment extends Fragment {
public DisplayFragment() {
// Required empty public constructor
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
return inflater.inflate(R.layout.fragment_display, container, false);
}
#Override
public void onViewCreated(#NonNull View view, Bundle savedInstanceState) {
super.onViewCreated(view, savedInstanceState);
TextView txt = view.findViewById(R.id.tv1);
// Get the ViewModel from the hosting activity, could be
// Main or Second, and observe its message. Update the
// TextView if the message is changed.
MainViewModel viewModel = new ViewModelProvider(requireActivity()).get(MainViewModel.class);
viewModel.message().observe(getViewLifecycleOwner(), s -> {
txt.setText(s);
});
}
}

How to load TextureView as a part of view

I would like to load TextureView as a part of my layout. I saw before some examples that it uses TextureView inside setContentView function.
...
TextureView textureView = new TextureView(this);
textureView.setSurfaceTextureListener(this);
setContentView(textureView);
but I want to load this textureView as a part of a xml layout. how can I do?

Try this your can directly add TextureView in your layout like this
<LinearLayout
android:id="#+id/rootView"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="#color/colorPrimaryDark"
android:orientation="vertical">
<TextureView
android:id="#+id/textureView1"
android:layout_width="350dp"
android:layout_height="350dp"
android:layout_below="#+id/textView1" />
</LinearLayout>
or your can dynamically add TextureView in your layout like this
public class MainActivity extends AppCompatActivity implements TextureView.SurfaceTextureListener {
LinearLayout rootLinearLayout;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
rootLinearLayout = findViewById(R.id.rootView);
TextureView textureView = new TextureView(this);
textureView.setSurfaceTextureListener(this);
rootLinearLayout.addView(textureView);
}
#Override
public void onSurfaceTextureAvailable(SurfaceTexture surfaceTexture, int i, int i1) {
}
#Override
public void onSurfaceTextureSizeChanged(SurfaceTexture surfaceTexture, int i, int i1) {
}
#Override
public boolean onSurfaceTextureDestroyed(SurfaceTexture surfaceTexture) {
return false;
}
#Override
public void onSurfaceTextureUpdated(SurfaceTexture surfaceTexture) {
}
}

You can use it in layout directly with TextureView and get it with findViewById().
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<TextureView
android:id="#+id/texture_view"
android:layout_width="match_parent"
android:layout_height="match_parent" />
</LinearLayout>

SwipeRefreshLayout is filling parent in Android

I'm trying to use a SwipeToRefreshLayout to update some information inside a marker. Although I use android:layout_width="wrap_content" to keep the content size, for some reason it always fills the parent, leaving a huge space below the information content. What am I doing wrong?
By the way, if I don't have the SwipeRefreshLayout , and use only the ScrollView, that empty space doesn't appear.
Here is my XML code:
<android.support.v4.widget.SwipeRefreshLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="#+id/svMarker"
android:layout_width="wrap_content"
android:layout_height="wrap_content" >
<ScrollView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="#+id/svMarkerInfo">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical"
android:id="#+id/llMarkerInfo">
</LinearLayout>
</ScrollView>
</android.support.v4.widget.SwipeRefreshLayout>
Thank you for your answers!
I leave also the image of how is being showed using the SwipeRefreshLayout. Behind the marker information there is a map:
If I dont use SwipeRefreshLayout, the marker information is shown the next way, which visually is what I am looking for. but I'm missing the SwipeToRefresh update:

The SwipeRefreshLayout will disabled while dragging a map by using a listener and the refresh will only take place if you swipe down on the second half ( i.e. the layout below map). To get map drag events, we need to do some workaround because there is no direct support from Google and this library MapStateListener has done that. Just paste these three classes MapStateListener.java, TouchableMapFragment.java, TouchableWrapper.java into your project.
Here is a working example.
MainActivity.java
public class MainActivity extends AppCompatActivity implements OnMapReadyCallback
{
private SwipeRefreshLayout swipeRefreshLayout;
private View secondHalf;
private TouchableMapFragment mMap;
#Override
protected void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
swipeRefreshLayout = (SwipeRefreshLayout) findViewById(R.id.svMarker);
secondHalf = findViewById(R.id.secondHalf);
setUpMap();
swipeRefreshLayout.setOnRefreshListener(new SwipeRefreshLayout.OnRefreshListener()
{
#Override
public void onRefresh()
{
// A thread to keep RefreshLayout busy for 5 seconds
if(!swipeRefreshLayout.isRefreshing())
new LoadImagesTask().execute();
}
});
}
public void setUpMap()
{
try
{
if (mMap == null)
{
mMap = ((TouchableMapFragment) getSupportFragmentManager()
.findFragmentById(R.id.firstHalf));
mMap.getMapAsync(this);
}
}
catch (Exception ex)
{
ex.printStackTrace();
}
}
#Override
public void onMapReady(GoogleMap googleMap)
{
new MapStateListener(googleMap, mMap, this)
{
#Override
public void onMapTouched()
{
// Map touched
swipeRefreshLayout.setEnabled(false);
}
#Override
public void onMapReleased() {
// Map released
swipeRefreshLayout.setEnabled(true);
}
#Override
public void onMapUnsettled() {
// Map unsettled
}
#Override
public void onMapSettled() {
// Map settled
}
};
}
private class LoadImagesTask extends AsyncTask<Void, Void, Void>
{
#Override
protected void onPreExecute()
{
super.onPreExecute();
}
#Override
protected Void doInBackground(Void... voids)
{
try
{
for (int i = 1; i <= 5; i++)
{
Thread.sleep(1000);
}
}
catch (Exception ex)
{
ex.printStackTrace();
}
return null;
}
#Override
protected void onPostExecute(Void aVoid)
{
super.onPostExecute(aVoid);
swipeRefreshLayout.setRefreshing(false);
}
}
}
main.xml
<?xml version="1.0" encoding="utf-8"?>
<android.support.v4.widget.SwipeRefreshLayout android:id="#+id/svMarker"
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
android:weightSum="2">
<fragment
android:id="#+id/firstHalf"
android:name="com.esealed.watermeterclient.TouchableMapFragment"
android:layout_width="match_parent"
android:layout_height="0dp"
android:layout_weight="1"
/>
<ScrollView
android:id="#+id/secondHalf"
android:layout_width="match_parent"
android:layout_height="0dp"
android:layout_weight="1"
android:background="#color/colorAccent">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical">
<!-- Other views comes here -->
</LinearLayout>
</ScrollView>
</LinearLayout>
</android.support.v4.widget.SwipeRefreshLayout>

The only solution I could figure out was defining the SwipeRefreshLayout size dinamically. No need to change my XML file.
On my MapActivity.class, where I manage the marker's info, every time I show a new marker information, I call the next method:
LinearLayout llMarkerInfo = (LinearLayout) findViewById(R.id.llMarkerInfo);
SwipeRefreshLayout svMarker = (SwipeRefreshLayout) findViewById(R.id.svMarker);
//First i register to the listener so I can get the measured size of the marker information's layout
ViewTreeObserver vto = llMarkerInfo.getViewTreeObserver();
vto.addOnGlobalLayoutListener(new ViewTreeObserver.OnGlobalLayoutListener() {
#Override
public void onGlobalLayout() {
//I get the measured width and height of the marker information's layout
int width = llMarkerInfo.getMeasuredWidth();
int height = llMarkerInfo.getMeasuredHeight();
//Set that size to the SwipeToRefresh layout
LinearLayout.LayoutParams svParams = new LinearLayout.LayoutParams(width, height);
svMarker.setLayoutParams(svParams);
//Unregister the listener so is not called many times
if (Build.VERSION.SDK_INT < 16)
llMarkerInfo.getViewTreeObserver().removeGlobalOnLayoutListener(this);
else
llMarkerInfo.getViewTreeObserver().removeOnGlobalLayoutListener(this);
}
});
This way, I define exactly the size my marker information's layout has, to my SwipeRefreshLayout, dinamically.
Image with the final result (expected = reality):

Android Studio Progress Bar Move

I put a progress bar in my android studio project , and want it to move , but i don't know how to do that . I tried to look for tutorials on YouTube and follow along , but that didn't work out for me. Then i looked on google for tutorials but that didn't work for me . When i search them up i only see tutorials with the circle loading bars and I want mine to be horizontal . I only know where to start the loading bar but i really want to know how to make it move and then go into the game . I don't have any code because when i seen that it wasn't working i just deleted it . If anybody has a good tutorial or code that could help me i would appreciate very much . Thanks.

have very easy way to use progress bar within whole code
custom_progressbar.xml
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:gravity="center"
android:orientation="vertical">
<ProgressBar
android:id="#+id/progressbar_view"
android:layout_width="#dimen/_70sdp"
android:layout_height="#dimen/_70sdp"
android:indeterminate="true"
android:padding="#dimen/_10sdp" />
</RelativeLayout>
CustomProgressBar.java
public class CustomProgressBar extends Dialog {
Activity activity;
public CustomProgressBar(Activity act) {
super(act);
this.activity = act;
}
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
requestWindowFeature(Window.FEATURE_NO_TITLE);
setContentView(R.layout.custom_progressbar);
setCancelable(false);
// set backgroung transparent
getWindow().setBackgroundDrawable(new ColorDrawable(android.graphics.Color.TRANSPARENT));
}
}
and apply whenever you want activity or fragment
public CustomProgressBar customProgressBar;
customProgressBar = new CustomProgressBar(context);
customProgressBar.show();

public class MainActivity extends AppCompatActivity {
private ProgressBar progressBar;
private TextView loading;
private int progressStatus = 0;
private Handler pHandler = new Handler();
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
progressBar = (ProgressBar) findViewById(R.id.progressBar);
loading = (TextView) findViewById(R.id.loading);
new Thread(new Runnable() {
#Override
public void run() {
while (progressStatus < 100) {
progressStatus ++;
android.os.SystemClock.sleep(50);
pHandler.post(new Runnable() {
#Override
public void run() {
progressBar.setProgress(progressStatus);
}
});
}
pHandler.post(new Runnable() {
#Override
public void run() {
loading.setText("COMPLETE");
}
});
}
}).start();
}
This code works. You should be able to use the default XML code for the ProgressBar. You will need to add the elements, for example, the actual progress bar in the visual design. You will need to add an extra '}' at the end I think.

Check this: Infact you have to code for the horizontal progress bar movement and set its progress, it's specially used in downloading to show percentage of operation completion.
XML code:
<ProgressBar
android:id="#+id/progressBar1"
style="?android:attr/progressBarStyleHorizontal"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_alignParentTop="true"
android:layout_marginLeft="23dp"
android:layout_marginTop="20dp"
android:indeterminate="false"
android:max="100"
android:minHeight="50dp"
android:minWidth="200dp"
android:progress="1" />
java code:
public class MainActivity extends Activity {
private ProgressBar progressBar;
private int progressStatus = 0;
private TextView textView;
private Handler handler = new Handler();
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
progressBar = (ProgressBar) findViewById(R.id.progressBar1);
textView = (TextView) findViewById(R.id.textView1);
//Long operation by thread
new Thread(new Runnable() {
public void run() {
while (progressStatus < 100) {
progressStatus += 1;
//Update progress bar with completion of operation
handler.post(new Runnable() {
public void run() {
progressBar.setProgress(progressStatus);
textView.setText(progressStatus+"/"+progressBar.getMax());
}
});
try {
// Sleep for 200 milliseconds.
//Just to display the progress slowly
Thread.sleep(200);
} catch (InterruptedException e) {
e.printStackTrace();
}
}
}
}).start();
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items
//to the action bar if it is present.
getMenuInflater().inflate(R.menu.activity_main, menu);
return true;
}
}

.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
android:weightSum="50">
<ProgressBar
style="?android:attr/progressBarStyleHorizontal"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:indeterminate="false"
android:id="#+id/Bar1"
android:max="10"
android:padding="15dp"
android:paddingTop="5dp"
android:paddingRight="20dp"
android:paddingLeft="20dp">
</ProgressBar>
<Button
android:id="#+id/button1"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:onClick="startProgress"
android:text="Start" />
<ProgressBar
style="?android:attr/progressBarStyleHorizontal"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="#+id/progressBar2"
android:layout_gravity="center_horizontal" />
</LinearLayout>
MainActivity.java
package com.example.dell.vlakna;
import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.widget.ProgressBar;
import static com.example.dell.vlakna.R.layout.activity_main;
public class MainActivity extends Activity {
private ProgressBar bar;
/** Called when the activity is first created. */
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(activity_main);
bar = (ProgressBar) findViewById(R.id.Bar1);
}
public void startProgress(View view) {
bar.setProgress(0);
new Thread(new Task()).start();
}
class Task implements Runnable {
#Override
public void run() {
for (int i = 0; i <= 10; i++) {
final int value = i;
try {
Thread.sleep(1000);
} catch (InterruptedException e) {
e.printStackTrace();
}
bar.setProgress(value);
}
}
}
}
this code run good.

ListView doesn't show progressbar when the data loaded

When I start activity with ListView it start to load some information from the Internet and after apply adapter, but during loading ListVIew doesn't show me a ProgressBar ring. When I trying to use SherlockListActivity instead ListView I have same problem.
<?xml version="1.0" encoding="utf-
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical" >
<ListView
android:id="#+id/comments"
android:layout_width="fill_parent"
android:layout_height="wrap_content" />
public class CommentsActivity extends SherlockActivity{
#InjectView(R.id.comments) ListView mCommentsListView;
private String mPostId;
private CommentsAdapter mAdapter;
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.comment_activivty);
ButterKnife.inject(this);
Intent intent = getIntent();
mPostId = intent.getStringExtra("POST_ID");
LC lc = new LC();
lc.execute(mPostId);
}
public void setupAdapter(){
mAdapter = new CommentsAdapter(this);
mCommentsListView.setAdapter(mAdapter);
}
private class LC extends LoadComments{
#Override
protected void onPostExecute(Void result) {
//setup adapter after loading comments
setupAdapter();
}
}
}

Add ProgressBar to your layout file:
<ProgressBar
android:id="#+id/progress_bar"
android:layout_gravity="center"
android:layout_width="wrap_content"
android:layout_height="wrap_content" />
Inject the ProgressBar in your activity:
#InjectView(R.id.progress_bar) ProgressBar mProgressBar;
Now you have to hide it when the adapter is set:
public void setupAdapter(){
mAdapter = new CommentsAdapter(this);
mCommentsListView.setAdapter(mAdapter);
mProgressBar.setVisibility(View.GONE);
}

Do it like this,
#Override
protected Void OnPreExecute(){
ProgressDialog prgDialog = new ProgressDialog(getContext());
prgDialog.setTitle("Loading");
prgDialog.setMessage("please wait")
prgDialog.setCancelable(false);
prgDialog.show();
}
on post Execute
private class LC extends LoadComments{
#Override
protected void onPostExecute(Void result) {
//setup adapter after loading comments
prgDialog.dismiss();
setupAdapter();
}
}