Develop Reference

Android TextView.setText() is not changing on recent Samsung phones with SurfaceView Overlay

In my app I have a TextView and an ImageView that I update based on sensor information. This works perfectly on emulators and most of the handsets I have tried it on, however on Samsung handsets from the S7 to the S9 for some reason neither of them changes when they should be updated.
They are part of a Fragment overlaying a SurfaceView with a camera preview in it, there is a second SurfaceView overlay above them:
<FrameLayout 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="myApp.CameraViewFragment">
<FrameLayout
android:id="#+id/control"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_alignParentBottom="true"
android:layout_alignParentStart="true">
<myApp.CameraSurfaceView
android:id="#+id/camera_view"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentStart="true"
android:layout_alignParentTop="true" />
<TextView
android:id="#+id/direction"
android:layout_width="80dp"
android:layout_height="wrap_content"
android:background="#color/black_overlay"
android:layout_gravity="center_horizontal"
android:gravity="center"
android:layout_centerInParent="true"
android:layout_centerHorizontal="true"
android:layout_marginTop="10dp"
android:textSize="30dp"
android:text="" />
<ImageButton
android:id="#+id/gpsNotification"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:src="#drawable/gps_unfixed"
android:layout_gravity="right"
android:tint="#color/gps_unfixed"
android:background="#null" />
</FrameLayout>
<com.myapp.OverlaySurfaceView
android:id="#+id/overlay_view"
android:layout_width="200dp"
android:layout_height="200dp"
android:gravity="center"
android:layout_gravity="center_horizontal|center_vertical"
android:layout_centerHorizontal="true"
android:layout_centerVertical="true" />
</FrameLayout>
As far as I know, this is the relevant part of the Fragment code:
public class CameraViewFragment extends Fragment
{
private TextView directionView;
private CameraSurfaceView cameraView;
private OverlaySurfaceView overlay;
#Override
public void onViewCreated(final View view, Bundle savedInstanceState) {
cameraView = (CameraSurfaceView) view.findViewById(R.id.camera);
directionView = (TextView) view.findViewById(R.id.direction);
overlay = (OverlaySurfaceview) view.findViewById(R.id.overlay_view);
}
private void setDirection(AccurateDirection direction) {
final String directionString = direction.getDirection();
overlay.update();
Activity activity = getActivity();
if ( activity != null ) {
activity.runOnUiThread(new Runnable() {
public void run() {
directionView.setText(directionString);
directionView.invalidate();
}
});
}
}
}
When I run this on a regular handset, the directionView text updates as new direction data arrives. On a Samsung S7 the value gets set once, maybe updated once right at the start and then it seems to stick and not change any more. If I pause in the debugger and call directionView.getText() from the immediate window, it gives me the result I am expecting, not what I see on the screen. If I call directionView.setText('ABC') in the immediate window, the value returned by directionView.getText() changes but again the value on the screen does not. The ImageView also seems to get stuck in its initial state regardless of changes that should adjust it.
Previous questions on this topic seem to involve updates not being triggered from the UI thread or failures to call invalidate on the view component, so I have fixed both of those already but the problem persists.
I have only seen this on recent Samsung handsets ( my old Samsung S4 appears to be fine ) which makes it hard to troubleshoot. Why are my view components not changing on the Samsung devices and what do I need to do to get them to update?
Edit: Apologies to anyone previously attempting to answer this as I had ommited the OverlaySurfaceView and I now realise that the other components update correctly if the OverlaySurfaceView is removed, so apparently having that second SurfaceView in the view hierarchy is interfering, but only on Samsung. Switching on and off hardware acceleration doesn't seem to make a difference, but there may be a specific place or way that I need to do it. On a working handset hardware acceleration is marked as disabled for the `OverlaySurfaceView.

I had the same issue with Samsung S7 device,
eventually I realized i was not handling the setZOrderOnTop correctly
check out this answer :
Button on top of SurfaceView with setZOrderOnTop set to true in Android

EditText keeps writing in single line Android

I know this question has been asked before and I tried several answers but none of them worked. I have an EditText where the user gives caption of a picture. The editText keeps writing the text in a single line. It doesn't go to the next line. I want the text to go to next line automatically when it reaches the screen's border/end. Here's my code. Please let me know if I have made any mistakes in my code.
<EditText
android:layout_marginTop="8dp"
android:layout_width="match_parent"
android:layout_height="80dp"
android:gravity="start"
android:inputType="textMultiLine|textPersonName"
android:hint="Write some thing about the photo"
android:maxLength="160"
android:paddingLeft="8dp"
android:textSize="14sp"
android:layout_below="#+id/privacyHolder"
android:lines="3"
android:layout_alignParentEnd="true"
android:ems="20"
android:paddingEnd="4dp"
android:maxLines="3"
android:layout_marginEnd="4dp"
android:layout_marginStart="4dp"
android:paddingTop="4dp"
android:background="#drawable/roundedbutton"
android:id="#+id/description"
/>

In the Resource, design your edit text as follow:
<EditText
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:inputType="text|textMultiLine|textCapSentences"
android:gravity="left"
/>
In the activity you can use TextWatcher to listen when text exceeds few character and automatically move down.
Here is the snippet :
private boolean isReach = false;
// put this in onCreate method
edittext.addTextChangedListener(new TextWatcher(){
#Override
public void afterTextChanged(Editable s) {
// if edittext has 20 character reached add a new line, you can use either 20 or more here
if(yourtextEd.getText().length() == 20 && !isReach) {
yourtextEd.append("\n");
isReach = true;
}
// if edittext has less than 20 characters and isReach has set , change
if(yourtextEd.getText().length() < 20 && isReach) isReach = false;
}
});
Hope this will help you.

Getting all checkboxes, radio buttons, ratings from an expandable list view: android

I have an expandable list view that houses a short survey (3-4 fields for a user to insert data about) per record that we have. Then we have a button that they can hit to submit the data to our server. When they hit the button I need it to grab all the data in the surveys and send it to our site. I have the sending portion of it figured out; what I'm struggling with is grabbing all the data from the survey.
I've looked through many of the related posts/google results and attempted to implement and adapt their solution for listviews to expandedlistviews but I have not been able to get any of them working. I've spent quite a few hours trying to get some workable solution but alas, I cannot figure it out.
I think part of my problem is I'm not exactly certain how children views come into play for expandable list views. In any event below is my code in hopes that someone smarter than me can help me solve this problem.
So I have my ExpandableListView fragment_survey.xml:
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
tools:context="edu.ucr.aum.fragments.SurveyFragment$PlaceholderFragment">
<ExpandableListView
android:id="#+id/list_view_survey_list"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_marginLeft="#dimen/rowPaddingMedium"
android:layout_marginRight="#dimen/rowPaddingMedium"
android:divider="#null"
android:dividerHeight="0dp"
android:clipToPadding="false"
android:scrollbarStyle="outsideOverlay" />
<TextView
android:id="#+id/tvResponseCode"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_below="#+id/list_view_survey_list"
android:text="Response Code: "/>
<Button
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="Submit Survey"
android:layout_below="#+id/tvResponseCode"
android:id="#+id/btnSubmitSurvey" />
</RelativeLayout>
And here is my row xml list_view_survey_row.xml:
<TextView
android:id="#+id/tvSurveyTitle"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="#string/surveyTitle" />
<TextView
android:id="#+id/tvSurveyShared"
android:layout_width="wrap_content"
android:layout_height="fill_parent"
android:text="#string/surveyShared"
android:layout_below="#+id/tvSurveyTitle"
/>
<RadioGroup
android:id="#+id/radioShared"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_below="#+id/tvSurveyShared">
<RadioButton
android:id="#+id/radioButtonYes"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="#string/yes"
android:focusable="true"/>
<RadioButton
android:id="#+id/radioButtonNo"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="#string/no"
android:focusable="true"/>
</RadioGroup>
<TextView
android:id="#+id/tvSurveyReason"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="#string/surveyReason"
android:layout_below="#+id/radioShared" />
<TextView
android:id="#+id/tvSurveyRating"
android:layout_width="wrap_content"
android:layout_height="fill_parent"
android:text="#string/surveyRating"
android:layout_below="#+id/tvSurveyReason" />
<CheckBox
android:id="#+id/checkBoxInterest"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="#string/surveyInterestPositive"
android:layout_below="#+id/tvSurveyRating"
android:focusable="true" />
<CheckBox
android:id="#+id/checkBoxPrivacy"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="#string/surveyShareLevelPositive"
android:layout_below="#+id/checkBoxInterest"
android:focusable="true" />
<RatingBar
android:id="#+id/ratingBar"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="#+id/checkBoxPrivacy"
android:focusable="true" />
<View android:layout_width="fill_parent"
android:layout_height="2dip"
android:background="#FF00FF00"
android:layout_below="#+id/ratingBar" />
Then I have a fragment (fragment_survey.java) which adds an onclicklistener to the button (btnSubmitSurvey) in the fragment_survey.xml file. That onClickListener() function calls two methods (one to get the data and one to send that data).
this.buttonSubmit.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
getData(v);submitSurvey();
}
});
public void getData(View view) {
//get data here
}
public void submitSurvey() {
// Create a new HttpClient and Post Header
String url;
if(Singletons.Debug.debug) {
url = "url for postback";
} else {
url = "url for postback";
}
NetworkAsyncTask nat = new NetworkAsyncTask();
try {
String response = nat.execute(url).get();
//Log.d(TAG, "Response: " + response);
} catch(ExecutionException e) {
} catch(InterruptedException e) {
}
}

You should create a data structure like an array to store the survey data, I would index it by group and/or child position, whatever makes sense for the data. Then you should add listeners for each question input, when a question is answered yes, add into that data structure the answer at the appropriate location. Then when you press the submit button it can iterate over that data structure, prompt for unanswered questions or fill out default values, gather it all together and then submit.
Basically there's no easy/built in way to access the individual rows of your dynamic/reusable rows that I have been able to find. When the context of which row is important I've found the best way is to have my own data structure that uses the group/child position to find which button is being pressed since every row has a button with the same id. I also store the group position/index in the button using setHint on creation so that in the context of the listener i can determine the position.

I had to do this via a horrific hack-job, but it works. I added a button for each row that will allow the user to "save" the row. When they save the row then the data is saved to my data structure. Unfortunately to get this working properly I had to create a custom OnClickListener which takes the view as an argument and from there I can scrape the elements from the view.
It's not an elegant or good solution; but it works.

button press in Android app creates casting error

I am new to android development, and have been trying to use the beginner's tutorial as my starting point for developing a simple app. There is one screen, with an image, a row of four buttons, a textbox for the user to enter a pin, and a textview to display results.
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:id="#+id/linear_layout_1"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical" >
<ImageView
android:id="#+id/imageView1"
android:contentDescription="#string/image"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:src="#drawable/skytrek"
/>
<LinearLayout
android:id="#+id/linear_layout_2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:orientation="horizontal" >
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textSize="14sp"
android:text="#string/button_today"
android:onClick="today_click" />
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textSize="14sp"
android:text="#string/button_tomorrow"
android:onClick="tomorrow_click" />
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textSize="14sp"
android:text="#string/button_this_week"
android:onClick="this_week_click" />
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textSize="14sp"
android:text="#string/button_next_week"
android:onClick="next_week_click" />
</LinearLayout>
<EditText android:id="#+id/editText1"
android:layout_height="wrap_content"
android:layout_width="wrap_content"
android:hint="#string/edit_message" />
<TextView
android:id="#+id/textView1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="#string/init_message"/>
</LinearLayout>
I have code to deliver the results I want based on the button pressed - all fine. But then I wanted the user to enter a PIN as well as pressing a button, so I added the EditText control. This threw the following error:
E/AndroidRuntime(28578): Caused by: java.lang.ClassCastException: android.widget.TextView cannot be cast to android.widget.EditText
My Java class:
private String content = null;
private TextView textView1;
private EditText editText1;
public void today_click(View view) {
getPage("today");
}
public void tomorrow_click(View view) {
getPage("tomorrow");
}
public void this_week_click(View view) {
getPage("thisweek");
}
public void next_week_click(View view) {
getPage("nextweek");
}
public void getPage(String strParam) {
editText1 = (EditText) findViewById(R.id.editText1);
String message = editText1.getText().toString();
if (message.equals("4567")) {
content = "PIN recognised";
} else {
content = "PIN not recognised";
}
textView1 = (TextView) findViewById(R.id.textView1);
textView1.setText(content);
}
I thought I had done something silly, using the name of a TextView instead of an EditText control, but I can't find it if I have.
The error is being thrown at the line
getPage("thisweek");
I didn't understand how this line involved views of any sort, but of course the function heading
this_week_click(View view)
does, and when I changed the order of the TextView and the EditText in the XML file (so that the TextView comes first), the error disappeared. It is as if the "view" being passed is not the button, but the nearest widget to the button. I have read
existence of parameter (View view)
but it only seems to confirm my (mis)understanding that a button should be passed as the view parameter. I have also tried cleaning the project, and building a completely new project. What on earth is causing the casting error?

If you're using Eclipse, go to the menu voice "Project" and select "Clean"
Sometimes Eclipse has some problem with ids, by cleaning the project you regenerate them..

Everytime if you make any changes in xml or any interchange of position of views in xml or change of id's,you need to clean build your project.If not you will get this exception.

Hello I have tested your code, your code is fine. Please clean your project from
select your project then click on Project and then Clean and also check the Build Automatically . Your auto generated class R is not generated properly.

Try cleaning your project and run it again..
Eclipse -> Project menu ->Clean
It is because eclipse gets confused when we play around in the xml file ;)

Easiest way to have button open browser to specific URL

It's a simple app I've got and I'd like the button I've made to launch a specific URL via the browser. Could you guys give me a little info to get this going, like I've said I've got the button already to go in my app. Here's the code -- lemme' know if you need anything else
.java File
package reseeveBeta.mpi.dcasey;
import android.app.Activity;
import android.os.Bundle;
public class ReseeveBetaActivity extends Activity {
/** Called when the activity is first created. */
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
}
}
.XML
<?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" >
<TextView
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="Welcome to Reseeve, tap register to begin account creation" />
<Button
android:id="#+id/button1"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="Register" />
<EditText
android:id="#+id/editText1"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:ems="10"
android:inputType="textMultiLine"
android:text="If you already have and account, please login below" >
<requestFocus />
</EditText>
</LinearLayout>

This line should open your built-in browser, with the specified url:
startActivity(new Intent(Intent.ACTION_VIEW).setData(Uri.parse("http://www.google.com")));
Your Activity should have parts like this:
//define class variables here
Button btn;
protected void onCreate(Bundle savedInstanceState)
{
//some code of yours
btn=(Button)findViewById(R.id.button1);
btn.setOnClickListener(this);
//more code of yours
}
//whatever else you have in your source code
public void onClick(View v)
{
//handle the click events here, in this case open www.google.com with the default browser
startActivity(new Intent(Intent.ACTION_VIEW).setData(Uri.parse("http://www.google.com")));
}
It might not be 100% accurate syntax, since I did just write this on my own, but you get the idea.

You can do that with Rebol 3, this easily:
REBOL []
load-gui
view [button "Go" on-action [browse http://msn.com]]
That's a fully functioning GUI program, which runs on Android AND on desktop, using the exact same code across all platforms. Take a look at:
http://rebolforum.com/index.cgi?f=printtopic&permalink=Nick25-Aug-2013/10:08:38-7:00&archiveflag=new

Simple create one WebView in xml
<WebView
android:id="#+id/web_view"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_weight="1.0" />
Here is the Simple java code for that
String URL="www.gtumca.co.cc";
WebView wv=(WebView)findViewById(R.layout.web_view);
onClick()
{
wv.loadUrl(URL);
}