A fairly normal scenario: an Android application has a preferences activity, and selecting an option from a ListPreference triggers code to change that ListPreference's summary text. ie: Selecting "Green" from a color ListPreference would change the ListPreference's summary text to "Green" through a onPreferenceChange callback.
I'd like to be able to use the Android JUnit testing to confirm that these summary changes are all being performed correctly. However, there seems to be very little information out there on how to do this.
I've tried variations of using setValue() on ListPreference, both in the test thread and through runOnUiThread(), with no success - this doesn't trigger the call to onPreferenceChange(). I've also tried getInstrumentation().waitForIdleSync() after calling setValue(), but that's also with no success.
So, my question is: how is this done?
Thanks!
A few more hours of work produced this working solution, but I'm curious if anyone else has a better solution. This code was inspired by this solution to a similar question, but this case is different in two ways:
It's intended for use by Android JUnit, which means it needs to call the ListPreference UI clicks via runOnUiThread().
It expects there to be preference categories in use, which complicate finding the position (relative to the entire preferences list) to click. The above mentioned solution only works in cases without preference categories.
This method will accept the key for a particular ListPreference item, along with the position of the item in the list to be clicked. It will then perform that list item click, and other code would do the checking I'm looking for.
Note that this requires setActivityInitialTouchMode(true); to be set before the getActivity() call in the setUp() method.
private void clickListPreference(String _listPreferenceKey, int _listItemPos){
final String listPreferenceKey = _listPreferenceKey;
final int listItemPos = _listItemPos;
mActivity.runOnUiThread(
new Runnable() {
public void run() {
// get a handle to the particular ListPreference
ListPreference listPreference= (ListPreference) mActivity.findPreference(listPreferenceKey);
// bring up the dialog box
mActivity.getPreferenceScreen().onItemClick( null, null, getPreferencePosition(), 0 );
// click the requested item
AlertDialog listDialog = (AlertDialog) listPreference.getDialog();
ListView listView = listDialog.getListView();
listView.performItemClick(listView, listItemPos, 0);
}
/***
* Finding a ListPreference is difficult when Preference Categories are involved,
* as the category header itself counts as a position in the preferences screen
* list.
*
* This method iterates over the preference items inside preference categories
* to find the ListPreference that is wanted.
*
* #return The position of the ListPreference relative to the entire preferences screen list
*/
private int getPreferencePosition(){
int counter = 0;
PreferenceScreen screen = mActivity.getPreferenceScreen();
// loop over categories
for (int i = 0; i < screen.getPreferenceCount(); i++){
PreferenceCategory cat = (PreferenceCategory) screen.getPreference(i);
counter++;
// loop over category items
for (int j = 0; j < cat.getPreferenceCount(); j++){
if (cat.getPreference(j).getKey().contentEquals(listPreferenceKey)){
return counter;
}
counter++;
}
}
return 0; // did not match
}
}
);
getInstrumentation().waitForIdleSync();
}
Related
This is driving me a little mad since I know this should be very simple but I am not getting the desired affect.
I have the following arraylist
private List<String> tagStringArray = new ArrayList<>();
Then later I have a method that creates dynamic buttons, based on ID values pulled across from my Retrofit instance.
In my method, I have a count to help me set the title of the button but I also add the values of count to an ArrayList for use in another method.
I have taken a snip of relevant information from the method mentioned.
count = 1;
if (!questionNumber.equals("") && !questionNumber.equals(null)) {
for (final Object value : list) {
try {
/*Dynamically create new Button which includes the question number
*/
final AppCompatButton btn_question = new AppCompatButton(getActivity());
/*LayoutParams (int width, int height,float weight)
As LayoutParams is defaulted in px, I have called a method called dpToPX to make sure
the dynamically added EditText is the same size on all devices.
*/
LinearLayout.LayoutParams params = new LinearLayout.LayoutParams(dpToPx(280), dpToPx(45), 1);
btn_question.setBackgroundColor(Color.parseColor("#3B5998"));
btn_question.setTextColor(Color.WHITE);
btn_question.setText("Question "+count);
//set the Tag based on its position in the XML
tagStringArray.add(String.valueOf((count)));
count++;
If a user clicks on say Question 1 Button, I want my fragment to say Question 1, so to try and achieve that, I have tried doing the following:
String tags = String.valueOf(tagStringArray);
tags = tags.substring(1, tags.length() -1);
String[] currentTag = tags.split(",");
if (currentTag[0].contains("1")) {
tv_setQuestions_edit.setText("Question 1");
}else if(currentTag[1].contains("2")) {
tv_setQuestions_edit.setText("Question 2");
}
But this will always set the title to Question 1 and I am not sure what is going wrong.......
If I use the following toast Toast.makeText(getActivity(), Arrays.toString(currentTag), Toast.LENGTH_LONG).show(); it shows [1,2] so I know they are being added ok.
I did look into using tags by doing:
public static int KEY_COUNT=0; public static int KEY_VALUE=1;
btn_question.setTag(KEY_VALUE,value);
btn_question.setTag(KEY_COUNT,count);
But for some reason, when I add more than one tag (as I need a minimum of 2), my dynamic button is missing from the layout. But for some reason when only 1 tag - like this btn_question.setTag(value); is used, it shows up fine (I have a feeling its some issue with my fragment). Therefore I am trying to think of a workaround in the meantime.
Any help or guidance would be really appreciated.
It's because
currentTag[0].contains("1")
is always true. The first item of currentTag always contains "1".
Instead of doing this, why don't you just do String titleForFragment = myButton.getText() in the onClick method for the button? That way, you can set the same onClickListener on all the buttons, and it will reduce the amount of code you need to write.
I want to change dinamically the list entries and entryvalues of a listpreference. Well, finally it works, the list changes, but the problem is that I can see the new values only when I click the second time or more in the listpreference in the preference screen.
The first time, the list is always the original list, from 1 to 10.
numeroIntentosLP.setOnPreferenceClickListener(new OnPreferenceClickListener()
{
#Override
public boolean onPreferenceClick(Preference preference)
{
CharSequence[] NuevosValores = new String[10 - LineaActual];
int Indice = 0;
for(int i = LineaActual + 1; i <= 10; i++)
{
NuevosValores[Indice++] = String.valueOf(i);
}
numeroIntentosLP.setEntries(NuevosValores);
numeroIntentosLP.setEntryValues(NuevosValores);
return true;
}
});
I have tried with numeroIntentosLP.setOnPreferenceChangeListener, but the same result.
LineaActual is an integer value that I passed from MainActivity to PreferenceActivity. This is useful to me to know the new start value for the list.
So, everytime I open the preference screen and I click for the first time in the listpreference, I always get numbers 1 to 10, but when I click again, no matter how many times, I get what I want, I mean the list from LineaActual to 10.
Thanks in advance.
Ok, I found the solution. It was as easy as put the code directly in the onCreate, not in the listeners.
Thank you samgak, I saw your answer a little bit late and you're right, thank you anyway.
Ok im making app and it have 15 button's and 6 textview's.I want when I press first button to change value of first textview(value is "") to something (number one for example).But problem is when i press second button if first textview is already set to some value to set set second textview to second value.
If you need something else ask in comments (sorry for bad English)
here is what I was doing(this is under onclick)when i press second button
if(textview1.equals("1")){
textview2.setText("2");}
else if (textview1.equals("")){
textview1.setText("2");
}
It sounds like you wish to show last 6 buttons pressed.
Store all pressed buttons in a List (i.e. LinkedList) of size 6. Initially, it will be empty.
Then whenever any button is pressed do two things:
1) add it to the List and delete old elements if size exceeds six.
2) set button values from List.
Second step can be achieved like this:
// all TextViews should be in a list
private List<TextView> textViews;
// declare as field
private List<String> memoryQueue = new ArrayList<String>();
public void update() {
//set fields for the pressed buttons
for (int i=0; i<6 && i<memoryQueue.size(); i++) {
String text = memoryQueue.get(i);
textViews.get(i).setText(text);
}
// set empty fields
for (int i = memoryQueue.size(); i<6; i++) {
textViews.get(i).setText("");
}
}
This code snippet assumes that you store your TextViews in a List.
And Easiest way to keep track of last six button:
public void buttonPressed(Button button) {
//get text based on your button
String text = button.getText();
if (memoryQueue.contains(text)) {
return;
}
memoryQueue.add(text);
if (memoryQueue.size() > 6) {
memoryQueue.remove(0);
}
}
Since you're concerned with the text inside of your text view, you should be using the object's getText method:
if( textview1.getText().equals("1") ){ // Edited
textview2.setText("2");
} else if (textview1.getText().equals("")){ //Edited
textview1.setText("2");
}
At first, you have to get the String text from TextView using getText() method then you can compare that String with another String. Now, change your condition as follows...
if(textview1.getText().toString().equals("1")){
textview2.setText("2");}
else if (textview1.getText().toString().equals("")){
textview1.setText("2");
}
I have a spinner with a few values and I fill it from my webservice.
Filling the spinner
int i = 0;
var dropItems = new List<SpinItem2>();
DataRow[] result = myOPTvalues.Tables[0].Select("FieldValue=" + item.FieldValue);
foreach (DataRow row in result)
{
var optItem = new PrevzemSpin();
optItem.FieldValue = row["FieldValue"].ToString();
if (optItem.FieldValue.Equals(""))
optItem.FieldValue = null;
optItem.FieldTextValue = row["FieldTextValue"].ToString();
if (optItem.FieldTextValue.Equals(""))
optItem.FieldTextValue = null;
dropItems.Add(new SpinItem2(i, optItem.FieldValue.ToString(), optItem.FieldTextValue.ToString()));
}
i = 1;
foreach (DataRow row in myOPTvalues.Tables[0].Rows)
{
var optItem = new PrevzemSpin();
optItem.FieldValue = row["FieldValue"].ToString();
if (optItem.FieldValue.Equals(""))
optItem.FieldValue = null;
optItem.FieldTextValue = row["FieldTextValue"].ToString();
if (optItem.FieldTextValue.Equals(""))
optItem.FieldTextValue = null;
if (optItem.FieldValue != item.FieldValue)
{
dropItems.Add(new SpinItem2(i, optItem.FieldValue.ToString(), optItem.FieldTextValue.ToString()));
}
++i;
}
For some reason it acts like the item that was inserted first is "selected" on default and then triggers the ItemSelected event which I use to send the selected but I don't want that.
Since there's quite a number of these spinners on my screen it really slows down the activity plus it also sends the incorrect values to the field and since I use the ItemSelect to detect if everything went OK (let's say the service fell or the values themselves changed on server (someone added a new field on the server application) while the user is completing the form etc.)
Is there someway to tell the app not to trigger that on activity load but on actual user interaction?
I can't speak for Android specifically, but I have encountered this many times with Windows.
The solution I usually use is to simply add a boolean loading variable. Set it to true at the beginning of your initialisation and then clear it at the end.
In your event handlers like ItemSelected you can simply check if this is being triggered as the result of the initial load.
private void onItemSelected(....)
{
if(loading)
{
return; //Ignore as form is still loading
}
//Normal event handling logic goes here
....
}
Before I declared GetView:
int LastSpinnerSelectedPosition;
Inside my spinner definition:
LastSpinnerSelectedPosition = 0;
My spinner ItemSelected event:
var CurrentSelectedIndex = SpinnerValue.SelectedItemPosition;
if (CurrentSelectedIndex != LastSpinnerSelectedPosition)
{
// WHATEVER I WANTED TO DO ON ITEM SELECT ANYWAY
// Fix the LastSpinnerSelectedPosition ;)
LastSpinnerSelectedPosition = CurrentSelectedIndex;
}
Simple ;D
Just for clarification, the event fires when an item is selected. The semantics are obviously flawed, but technically the item IS selected when it initially loads since you can then immediately ask the spinner for which item is selected, so as the other answers say, just ignore the first time it is selected since it's guaranteed to be the loading select, and then proceed as normal after that.
I got a simple script:
int phases = 6;
final int max = 8;
final TextView[] a = new TextView[(max * phases)];
final Button[] b = new Button[phases]; // creates the buttons to display
// the single phases
for (int x = 0; x < phases; x++) {
b[x] = new Button(this);
b[x].setText("yourbutton");
// linL.addView(b[x]);
b[x].setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
if (a[(3)].getVisibility() == 0) {
for (int i = 0; i < max; i++)
a[i].setVisibility(View.GONE);
} else {
for (int i = 0; i < max; i++)
a[i].setVisibility(View.VISIBLE);
}
};
});
}
This checks basically if a textview is visible and if it's not then it makes it visible (plus the other way round).
My problem is now that I don't want to switch the same text views on again and again, I want to change the views depending on the x of the current loop of the button creation.
However, when i try to include this x, it says that it has to be final.
So how do i get parameters into that on click listener script? (I tried to add them, however it said then that I have to program the whole listener again...that's why I'm asking if there's a smarter way to do it)
Cheers, Christoph
You have 2 options:
Before the setOnClickListener line you can declare on another variable as final and you can assign the value of x into it. Then you will have final variable that holds the value of x that it can be used inside the function.
You can implement your own class that implements OnClickListener and you can add a constructor that get the value of x.
Some general notes:
I don't know if this is the way you write code or if you masked it when you wrote it here. (Masked, means that you change the variable names that it will be harder to understand what you are doing)
So, if you masked it, please don't, it make it much harder to answer you.
If this is the way you write code, I really encourage you to read some articles about coding standards and there importance. Your code isn't indent properly and the names of your variables have no meaning. After you finish with that project, try to read your code again a month later, you will see how hard it is for you to understand what you wrote
If I undertstand correctly, you want to pass parameters to your OnClickListener. I would suggest implementing your own OnClickListener interface - similar to rekaszeru's answer here