How to show 'please wait' and avoid GUI hang ? - android

I wrote application that contain 2 activities.
In the first one - i need to give the user the option to choose image from the gallery and i send this image to some server.
The Server return some result - and if the result is OK i need to show the second activity.
The problem that i have ..
when sending the image - i see that the screen is become black ...
I want to avoid this and show some nice GUI of 'please wait' - how can i do it ?
i want to make this sending image to the server to be from other thread - how can i do it from android ? how to define new thread with callback that will be called when the thread is done ?
Thanks for any help.

Use an asynctask. It would go something like this:
public void sendImage() {
SendToServer.execute();
}
protected class SendToServer extends AsyncTask<Void, Boolean, Void>
{
#Override
protected void onPreExecute()
{
//display your dialog
}
#Override
protected Boolean doInBackground(Void... arg0) {
//code to send your image to the serve
}
#Override
protected void onPostExecute (Boolean updateSuccess)
{
//close your dialog
//If image was successfully sent open your other activity
}
}

For question number 1:
You should use a ProgressDialog or a ProgressBar in order to show to the user that an operation is being executed. For more information you can check here: http://developer.android.com/reference/android/app/ProgressDialog.html
For question number 2:
A good solution would be to use AsyncTask for this operation which gives you a set of callback functions to control the operation. For more information you can check here: http://developer.android.com/reference/android/os/AsyncTask.html
Hope this helps for now!

you can define your custom layout and use the Activity.setContentView method to put whatever you want in your GUI. For instance you can put a ProgressBar widget.
As you have noticed, you wrote your android app in Java SE. Thread are fully supported.

This question has an answer which addresses the problem. Use that answer as a start, and let us know if you have any problems with some specific part.
Download image for imageview on Android
Good luck

Related

WebRTC for Android : VideoRendererGUI take a screenshot in the video call

The demand is that saving a video frame in the video call. I have made a demo that take a screenshot through the GLSurfaceView's method "onDrawFrame". But when I use the webrtc, it have its own renderer "VideoRendererGUI" .And then when I want to override it, I find it can't be overrided. the main part code :
vsv = (GLSurfaceView) findViewById(R.id.glviewchild_call);
vsv.setPreserveEGLContextOnPause(true);
vsv.setKeepScreenOn(true);
VideoRendererGui.setView(vsv, new Runnable() {
#Override
public void run() {
init();
}
});
And If you have another way to take a screenshot, you can also share with me.
Thanks a lot!
If you use a SurfaceViewRenderer to display the stream, you can use the solution in this answer to capture a frame on the call.
Basically, using surfaceViewRenderer.AddFrameListener with a class that implements EGLRenderer.FrameListener
I will assume that the SurfaceViewRenderer of the peer you want to take a screenshot of is called remotePeerSurfaceViewRenderer, also I will asume that the button that you will use to take a screenshot is called btnScreenshot
So all what you need to do is as "Webo80" said in the answer above use the FrameListener, the issue is the FrameListener implementation of the webrtc takes only the first frame available once the Listener is attached to the SurfaceViewRenderer, so my approach to do that is by attaching the webrtc implementation of the FrameListsner at the second I need to take a screenshot and remove it once it is taken:
btnScreenshot.setOnClickListener((view)-> {
remotePeerSurfaceViewRenderer.addFrameListsner(new EglRenderer.FrameListener() {
#Override
public void onFrame(Bitmap bitmap) {
runOnUiThread(() -> {
/*
do what ever you want with the bitmap for example
imgView.setImageBitmap(bitmap);
*/
localVideoView.removeFrameListener(this);
});
}
}, 1);
})
Important note:
1. Please don't forget to runOnUiThread as Iam doing
2. Please don't forget to remove the listener inside the button onClick() method
I have tried this solution and it is working more than fine, if you want to make your custom solution you have to completely implement the interface "EglRenderer.FrameListener"
I am sorry to say due to unavailability of canvas and other facilities in Android It's not possible to capture screenshot programatically using WebRTC. One can dodge this situation by animating the app's UI and capturing the screenshot manually , store it at configured location and exchange it with other party.

Android Swipe Images Intro Screen on First Run

I've been looking around a lot lately but haven't really found much on this.
I'm making my third Android app and I'm looking to implement an intro screen on first run of the app where a series of images are shown explaining the apps functionality and the idea behind it; you can swipe the images left or right and at the last image you get to the app by swiping.
I really like the sort of thing they have done with the CamScanner app but despite my searching I have no idea how to implement it other knowing a little bit about some people referring to Fragments. Any help would be appreciated greatly and since we need better UI on Android, a good answer would help a lot of developers take the cue! :)
create a method to show popup window. show images in a scroll view in that popup. at last image set touch listener to dismiss that popup.
and call that method from onResume method of your Activity like this
protected void onResume(){
super.onResume();
SharedPreferences pref = getSharedPreferences(MyPrefs, MODE_PRIVATE);
boolean b = pref.getBoolean("FirstTime",true);
if(b)
{ new Handler().postDelayed(new Runnable() {
public void run() {
showIntroPopup();
}
}, 100);
}
}
in that popup set "FirstTime" boolean to false in SharedPreferences.

Run multiple performClick() with UI update

button.performClick();
For software demonstration purposes, I want to show the user interface updating after each button performClick(). For example, if the Activity was a calculator I can currently simulate the pressing of buttons [1], [2] and [3] using
btn1.performClick();
btn2.performClick();
btn3.performClick();
However, these updates to the EditText too quickly with no visible pause, i.e. it appears "123" are written to the screen simultaneously. What I want is:-
btn1.performClick() updates UI so people can physically see only button press updated to the EditText before the next button does. Similarly with btn2.performClick() and then btn3.performClick().
You may want to use a library like Robotium, and use Solo.waitForText Method to do what you want.
The problem is that we can not determine in advance the time that it will take to display the text, as it depends on the content of your onClick method.
It's why Robotium may be useful for what you want.
You can either use
Thread.sleep(delay);
or use
handler.postDelayed(Runnable,delay);
Use handler for btn2.performClick() and btn3.performClick() like...
final Handler handler = new Handler();
handler.postDelayed(new Runnable() {
#Override
public void run() {
// do something after 100ms
btn2.performClick();
}
}, 100);

How to add a image on an event in android

I am new to Android. In my application I want to add an process bar(an image), this should indicate that something is in process and after completion hide this precess bar.
As if i add user detail, On click on add button this process bar should be displayed.
How can i do it, please suggest.
Thanks.
Code I used:
progressDialog = ProgressDialog.show(AddTicketActivity.this, "", "Loading...");
new Thread() {
public void run() {
try{
sleep(10000);
} catch (Exception e) {
Log.e("tag", e.getMessage());
}
progressDialog.dismiss();
}
}.start();
The problem with it is , it is hardcoded sleep(10000) whereas what i want is it to be dependent on how much time my process takes to add or fetch data.
I am not getting where to put code which is executing on onclick of button.
I hope you got my point
Thanks again.
For that you can use either ProgressDialog or ProgressBar.
Now, To display Progress bar and during that perform task in background, you should implement AsyncTask.
In onPreExecute() method, display the ProgressBar or make it visible again like: progressbar.setVisibility(View.VISIBLE);
In doInBackground() method, perform the background task, i.e. add user detail in your case
In onPostExecute() method, just hide the ProgressBar using the progressbar.setVisibility(View.INVISIBLE);
Well if you just want to show an image, you can place it on a RelativeLayout with visibility=gone
and then just control when to show or hide it.
another way is the typical progressDialog in Android
Or use a progress bar (spinning wheel) it's more user friendly and droid friendly .
Take a look at the Form widgets on Eclipse .

How design a button in Eclipse for Android App, so when you click, it takes you to a website

I already asked this question, but got answers that don't work and it counted as "Answered". Maybe someone knows how to design button in Eclipse for an Android app, so it takes you to a website ?Let's say this website.Thanks a lot.
Say u wanna go to google.com
public class MainActivity extends Activity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
}
public void onOpenWebBrowser(View v)
{
Intent webPageIntent = new Intent(Intent.ACTION_VIEW);
webPageIntent.setData(Uri.parse("https://www.google.co.in/"));
try {
startActivity(webPageIntent);
} catch (ActivityNotFoundException ex) {
}
}
}
Make sure u add uses internet permission to the manifest!
you can refer the following to get an idea ,
see this vogella from there, you can get idea how to create android app which has a Button
http://www.vogella.de/articles/Android/article.html
and then create WebView in xml and map it in java, as
http://developer.android.com/resources/tutorials/views/hello-webview.html
and For mor info refer android people.com
http://www.androidpeople.com/
http://developer.android.com/resources/samples/index.html
and also read my blog to know about android basics
http://sankarganesh-info-exchange.blogspot.com/p/corridor-your-foremost-footstep-in.html
You would need to set up an OnClickListener and tie it to your button. In the Listener's onClick method, you would load the specified URL into the WebView, which, based on your comments, it sounds like you've got that part figured out.

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