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How to Recognise which menuItem is disabled?

Heyy,
I have implemented menu, where there are two menu items and when I click on first item, the other menu item goes disabled and vise-versa.
And when I click on back button navigation icon, I have to check if first item is disabled or not and if disabled, then turn the second item enabled, and if not then onBackPressed();
So, I don't know how to recognize which item is disabled.
Please help me fast.
There are some code references
This is my current try and it also have some errors. Please help me find another way or fix this code.
toolbar.setNavigationOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
if (menu.getItem(0).getActionView().getVisibility() == View.VISIBLE) {
onBackPressed();
} else {
menu.getItem(1).setEnabled(false);
menu.getItem(1).setVisible(false);
menu.getItem(0).setEnabled(true);
menu.getItem(0).setVisible(true);
}
}
});

in onCreateOptionsMenu() store the menu into a local class field, and then to check if a certain menu item is enabled/disabled use isEnabled()
MenuItem item = menu.findItem(R.id.item_id);
if (item.isEnabled()) {
// enabled
} else {
// not enabled
}
Or you can use the order of the item among the menu items to get a particular item
MenuItem item = menu.getItem(0);

Can't re-enable a view after disabling it with CheckBox

I'm trying to enable/disable a seekbar when a checkbox is checked(or not).
I'm using this to create and refer:
CheckBox checkBoxProva = (CheckBox) findViewById(R.id.checkbox_prova);
boolean varCheckBoxProva = checkBoxProva.isChecked();
And this simple if to disable/enable the view:
if (!varCheckBoxProva) {
seekBarProva.setEnabled(false);
}
All this is inside the onCreate.
When the app starts the seekbar is disabled (so the if works), but if I check the CheckBox it doesn't change to enabled.
EDIT: I've succed thank to the reply of #rohan bhatia.

You are doing all of this in your onCreate method that only gets called when the activity is first created. You need to setup a listener that will be fired when the checkbox is clicked. See: https://developer.android.com/guide/topics/ui/controls/checkbox.html

You need a Listener that notifies when a checkbox is selected or deselected..
checkBoxProva.setOnCheckedChangeListener(new new CompoundButton.OnCheckedChangeListener() {
#Override
public void onCheckedChanged(CompoundButton buttonView,boolean isChecked) {
seekBarProva.setEnabled(isChecked);
}
}
);
Accordingly, whenever you click the checkbox the method onCheckedChanged() will be executed.. You will still need to specify this in onCreate -
seekBarProva.setEnabled(checkBoxProva.isChecked());
As onCheckedChanged() only listens for changes in checked state, so to specify initial stage you will need that above line too.

Simply insert an else block
if (!varCheckBoxProva) {
seekBarProva.setEnabled(false);
}else{
seekBarProva.setEnabled(true);
}
Alternative solution:
Personally, I'd recommend adding a listener to the checkbox inside your onCreate method.
checkBoxProva.setOnClickListener(new OnClickListener() {
#Override
public void onClick(View v) {
if(varCheckBoxProva){
seekBarProva.setEnabled(true);
}else{
seekBarProva.setEnabled(false);
}
}
});

How to change individual action item text color in ActionBar PROGRAMMATICALLY?

In my ActionBar, I have a MenuItem that has attribute showAsAction="always" as seen in the image below. Based on the connection a user has to our servers, I will be changing the text as well as color of the item.
Currently, I am able to change the text of the item very easily in onPrepareOptionsMenu(...):
#Override
public boolean onPrepareOptionsMenu(Menu menu) {
MenuItem item = menu.findItem(R.id.action_connection);
if(mIsConnected) {
item.setTitle(R.string.action_connected);
} else {
item.setTitle(R.string.action_not_connected);
}
return super.onPrepareOptionsMenu(menu);
}
This works great and if possible, I would like to change the color of the text here as well. I've seen many posts about how to change the text of ALL the overflow items or the title to the ActionBar itself but nothing about changing an individual action item PROGRAMMATICALLY. The current color is set in xml, I want to change it dynamically.

Well, each MenuItem View is actually a subclass of TextView, so this will make changing the text color easier.
A simple method you can use to locate a MenuItem View is View.findViewsWithText.
A basic implementation, considering you just have that one MenuItem you're interested in changing, might look something like this:
private final ArrayList<View> mMenuItems = Lists.newArrayList();
private boolean mIsConnected;
#Override
public boolean onCreateOptionsMenu(Menu menu) {
// Add a your MenuItem
menu.add("Connected").setShowAsAction(MenuItem.SHOW_AS_ACTION_IF_ROOM);
// Adjust the text color based on the connection
final TextView connected = !mMenuItems.isEmpty() ? (TextView) mMenuItems.get(0) : null;
if (connected != null) {
connected.setTextColor(mIsConnected ? Color.GREEN : Color.RED);
} else {
// Find the "Connected" MenuItem View
final View decor = getWindow().getDecorView();
decor.getViewTreeObserver().addOnGlobalLayoutListener(new OnGlobalLayoutListener() {
#Override
public void onGlobalLayout() {
mIsConnected = true;
// Remove the previously installed OnGlobalLayoutListener
decor.getViewTreeObserver().removeOnGlobalLayoutListener(this);
// Traverse the decor hierarchy to locate the MenuItem
decor.findViewsWithText(mMenuItems, "Connected",
View.FIND_VIEWS_WITH_CONTENT_DESCRIPTION);
// Invalidate the options menu to display the new text color
invalidateOptionsMenu();
}
});
}
return true;
}
Results

DialogFragment not visible but selectable

I have a very strange problem on Android using DialogFragments.
I have a FrameLayout with no content and the OnClickListener set to open a FragmentDialog where the user can choose what type of content he wants to add.
If I choose an image from the gallery, this image will be loaded and an image view inside the Frame-Layout is created and the image is shown. If the user clicks again on the layout the selection dialog should open again and the user can select a new image and the old one would be replaced.
This works quite well on my device with Android 4.1. But if I test it on Android 2.3 something strange happens:
The first dialog appears and the user can choose an image from the gallery. But if the user clicks again the dialog is not shown again. But the display becomes darker as if the dialog would be there but is not shown. If I click on the position where the selection dialog should be the gallery is started again. So the dialog is definitely there, but it is simply not shown.
I have tried almost everything that came to my mind(and what I found in the internet) to fix this issue, but it does not help anything. Of course I am using the support library to import the Fragment and DialogFragment.
I start this dialog from a Fragment which is embedded in a ViewPager. So it is basically a tabbed view. What's interesting: I I run into this bug and the display is just getting darker but no dialog is visible, I can cancel the invisible dialog and just drag the ViewPager a bit to left or right(to the next fragment) and if I get back and click on the content again the dialog is shown again.
But if I am dragging the ViewPager around there are no log messages so I have no idea why the dialog is suddenly visible again if I firstly move the page(only a bit is enough).
Here is some of my code:
in the onCreateView method I do the following:
rootView = inflater.inflate(args.getInt(ARG_OBJECT_TYPE), container, false);
editorActivity = ((NoteEditorActivity) EditorSectionFragment.this.getActivity());
// ...
if( fragmentId == R.layout.fragment_note_preferences_editor ){
// the other page
else if( fragmentId == R.layout.fragment_note_editor ) {
final View addLeftElement = rootView.findViewById( R.id.addLeftElement );
final View addRightElement = rootView.findViewById( R.id.addRightElement );
final View addTopElement = rootView.findViewById( R.id.addTopElement );
final View addBottomElement = rootView.findViewById( R.id.addBottomElement );
final FrameLayout contentLayout = (FrameLayout) rootView.findViewById( R.id.contentLayout );
showNavigation(editorActivity, contentLayout, editorActivity.currentPosition.x, editorActivity.currentPosition.y);
contentLayout.setOnClickListener( new OnClickListener() {
#Override
public void onClick(View v) {
Log.i("CONTENT CREATOR", "create new element at " + editorActivity.currentPosition);
//((NoteEditorActivity) EditorSectionFragment.this.getActivity()).showContentSelectionDialog();
((NoteEditorActivity) EditorSectionFragment.this.getActivity()).showCameraChooseDialog();
}
});
}
showCameraChoose(I also did it without the FragmentTransaction, but this didn't work either)
protected void showCameraChooseDialog() {
getSupportFragmentManager().executePendingTransactions();
FragmentTransaction ft = getSupportFragmentManager().beginTransaction();
Fragment prev = getSupportFragmentManager().findFragmentByTag("cameraChoose");
if( prev != null ){
Log.i("PREVIOUS", "Remove previous dialog");
ft.remove(prev);
}
(new CameraSelectionDialog()).show( ft, "cameraChoose");
}
CameraSelectionDialog:
public static class CameraSelectionDialog extends DialogFragment {
#Override
public Dialog onCreateDialog(Bundle savedInstanceState) {
final CharSequence[] items = {"Camera", "Gallery"};
AlertDialog.Builder builder = new AlertDialog.Builder( this.getActivity() );
builder.setTitle("Choose how to get the image!");
builder.setItems(items, new DialogInterface.OnClickListener() {
#Override
public void onClick(DialogInterface dialog, int which) {
if( which == 0){
((NoteEditorActivity)(getActivity())).startCamera();
CameraSelectionDialog.this.dismiss();
}
else{
((NoteEditorActivity)(getActivity())).startGallery();
CameraSelectionDialog.this.dismiss();
}
}
});
return builder.create();
}
}
The startGallery method simply starts an gallery intent:
protected void startGallery() {
Intent pickPhoto = new Intent(Intent.ACTION_PICK,
android.provider.MediaStore.Images.Media.EXTERNAL_CONTENT_URI);
startActivityForResult(pickPhoto , ActionCodes.GALLERY_ACTION_CODE);
}
This image is handled in the onActivityResult method. But it does not matter what I choose to do in the onActivityResult method. Even if I don't create the image, the problem occurs.
I have no idea what I can do to solve this problem and I hope that maybe you can think of a reason for this strange bug. I am grateful for any advice or hint what could be wrong.
Thank you in advance!

Adding a Button on a View

I am going nuts over this.
I did not find any working solution (tried a few from stackoverflow)
Scenario (this is an actual screenshot what is already done):
I have a Activity that has a View as his Attribute.
This view adds another view via View.addView(myView).
I now want to add a Button to myView (to be specific: after MotionEvent.ACTION_UP the button should appear in the right lower corner (this will start the robot to drive the track))
Here is a shortcut of my code:
public class ModeRouting extends View {
public ModeRouting(Context context) {
super(context);
Button asuroStartButton = new Button(context) //does not work
}
#Override
public boolean onTouchEvent(MotionEvent event) {
int actionevent = event.getAction();
if (actionevent == MotionEvent.ACTION_UP
|| actionevent == MotionEvent.ACTION_CANCEL) {
asuroStartButton.visible=true;
view.add(asuroStartButton);
}
return true;
}
}
and my Activity:
//in constructor
contentView = (FrameLayout) findViewById(R.id.content);
onClickListenerFacade(routingMode, route);
//this removes all views from stack and places the new one on the view
private void onClickListenerFacade(View v, final View target) {
v.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View arg0) {
contentView.removeAllViews();
contentView.setBackgroundColor(0xff000000);
contentView.addView(target);
modeSelectorAnimation();
}
});
}
I tried to create a button in my mainactivity.xml and instantiate in my mainactivity.
I am missing some point in here but i am not sure which.
Since my view is purely dynamic (no layout.xml) i dont think i should use a layout.xml (maybe thats my mind-blockage) but instead set the button attributes dynamically too.
Any hint is appreciated!

You want to extend ViewGroup rather than just a View (LinearLayout, RelativeLayout, FrameLayout, etc) - they handle child views for you.

I think maybe you need to refresh the whole view/activity. Try to do this in the onResume methode, maybe this helps. But as you don't use a layout.xml, I'm not sure if this helps you much..
#Override
protected void onResume(){
super.onResume();
setContentView(R.layout.activity_main);
}