I have a button in listview row that when I click on it I want a dialogFragment to be open and set the text of an edit text (that located inside the dialogFragment) to some String.
The problem is: the app shut down when it comes to the line of the settext method.
This is the code I use to open the dialogFragment and set text to it.
public void onClick(View v) {
FragmentManager manager = getFragmentManager();
View parentRow = (View) v.getParent();
ListView listView = (ListView) parentRow.getParent();
final int position = listView.getPositionForView(parentRow);
TrempData data = adapter.getItem(position); //from here im getting the data that i want to set to the edit text.
Addtremp trempDialog = new Addtremp();
trempDialog.show(manager, "Addtremp");
trempDialog.from.setText(data.get_from());
trempDialog.to.setText(data.get_to());
trempDialog.date.setText(data.get_date());
trempDialog.time.setText(data.get_time());
trempDialog.extra.setText(data.get_extras());
}
Hope someone could help me.
Thanks.
Your App will surely crash due to NullPointerException. Because you are trying to set data on UI which is not rendered yet.
What steps should follow?
Pass data to DialogFragment which is going to display on UI in a form of arguments.
Create callback which will inform you when UI is rendered on Dialog. Check this Callback to a Fragment from a DialogFragment
. On getting listener you could set data on your UI components.
Personally I prefer solution1 and for that you should read passing argument to DialogFragment
Related
I know there are lots of other answers on stackoverflow on the same thing but I can't seem to get it to work.
What I'm trying to do is find the ID of a view from an inflated layout. I want WV1 to load google.com when the button is clicked, you can see I'm using onClick from XML to do this.
public void ButtonClicked(View view)
{
View inflatedView = getLayoutInflater().inflate(R.layout.tab_content, null);
WV1 = (WebView) inflatedView.findViewById(R.id.tab1WV);
WV1.setWebViewClient(new InsideWebViewClient());
if (WV1.isShown()) {
WV1.requestFocus();
}
else{
}
if (WV1.isFocused()) {
WV1.loadUrl("http://www.google.com");
}
}
This is in the MainActivity, the webview (WV1) is in the other, inflated class.
Problem is, nothing happens at all...
I've been stuck on this for quite some time now, I appreciate all help given to me.. If there's any other information you require then just ask, thanks in advance!
--Edit--
In the MainActivity, theres tabhost and a button that creates new tabs. When new tabs are created the MainActivity inflates the second class file containing the webview, I can't get the mainactivity to find the webview from the inflated class. I dont know if this helps any more or not...
Check out this link:
Android - Add textview to layout when button is pressed
Where one of the answers does this:
mLayout.addView(createNewTextView(mEditText.getText().toString()));
where mLayout is a linear layout in the activity.
You'd have to add a view to one of your current layouts or start up an activity that opens up with a web view in it.
Alternative way to create webview :
Webview WV1 = new WebView(view.getContext);
WV1.setWebViewClient(new InsideWebViewClient());
if (WV1.isShown()) {
WV1.requestFocus();
}
else{
}
if (WV1.isFocused()) {
WV1.loadUrl("http://www.google.com");
}
}
Now add this to a view group
viewgroup.addchild(WV1);
You're not attaching it to anything. You need to either supply the parent when you inflate it, or call addView on the ViewGroup that should contain it.
public void ButtonClicked(View view){
View inflatedView = getLayoutInflater().inflate(R.layout.tab_content, (ViewGroup) findViewById(android.R.id.content));
WV1 = (WebView) inflatedView.findViewById(R.id.tab1WV);
WV1.setWebViewClient(new InsideWebViewClient());
if (WV1.isShown()) {
WV1.requestFocus();
}
if (WV1.isFocused()) {
WV1.loadUrl("http://www.google.com");
}
}
Or:
((ViewGroup)findViewById(android.R.id.content)).addChild(WV1);
Both of these will add your view at the end. You may need to add some layout attributes to get it to look like you want.
So i have a TextView Array, Let's just say:
TextView[] allTV = new TextView[sizeOfTheAray];
and i already fill in the array using this :
for(int i = 0;i<allTV.length;i++){
allTV[i]= new TextView(getApplicationContext());
allTV[i].setText("Hello there");
}
So what i want to do is, when I click a particular textview, it will open a new activity(each textview has different activity that is reffered to).
p.s. my class is already implements View.OnClickListener
Thank you in advance!
set the id of each text view and take a activity array relatively to text view id
and in on click listener cast the view as text view then get view id and open relative activity
I'm creating an EditText in onOptionsItemSelected() and trying to get it's information in onClick(). Here's the offending code:
onOptionItemSelected(MenuItem item){
...
EditText mealCalories = new EditText(context);
mealCalories.setId(MealCalId) //in this example it's just an integer 1.
...
}
onclick(View v){
EditText mealCaloriesInBox = (EditText)findViewById(mealCalId);
}
When I haven't selected an item from the menu (and thus haven't called onOptionItemSelected();) it doesn't crash when I click the button. However, when I actually have created the EditText and I click the button it crashes as it's trying to create the instance, giving me the aforementioned error. Any ideas on why it could be doing that?
EDIT
Here's more of my code:
#Override
public boolean onOptionsItemSelected(MenuItem item) {
Context context = getApplicationContext();
switch(item.getItemId()) {
case R.id.addMeal:
trackMealItems++;
mealCalId++;
mealFatId++;
mealCarbId++;
mealProteinId++;
//the base layout
LinearLayout root = (LinearLayout)findViewById(R.id.linearLayout1);
//make the layout that holds the meal item and add it to the base layout
LinearLayout mealItem = new LinearLayout(context);
mealItem.setId(trackMealItems);
mealItem.setOrientation(LinearLayout.VERTICAL);
mealItem.setLayoutParams(mealItemParams);
root.addView(mealItem);
//make the TextView that holds the name of the meal and add it to the mealItem layout
EditText mealName = new EditText(context);
mealName.setLayoutParams(mealNameParams);
mealItem.addView(mealName);
//make the TextViews that hold the information about the meal and stick them in a
//horizontal LinearLayout
LinearLayout mealStats = new LinearLayout(context);
mealStats.setOrientation(LinearLayout.HORIZONTAL);
mealStats.setLayoutParams(mealStatParams);
mealItem.addView(mealStats);
EditText mealCalories = new EditText(context);
mealCalories.setId(mealCalId);
mealCalories.setLayoutParams(mealStatParams);
mealStats.addView(mealCalories);
EditText mealFat = new EditText(context);
mealFat.setId(mealFatId);
mealFat.setLayoutParams(mealStatParams);
mealStats.addView(mealFat);
EditText mealCarbs = new EditText(context);
mealCarbs.setId(mealCarbId);
mealCarbs.setLayoutParams(mealStatParams);
mealStats.addView(mealCarbs);
EditText mealProtein = new EditText(context);
mealProtein.setId(mealProteinId);
mealProtein.setLayoutParams(mealStatParams);
mealStats.addView(mealProtein);
return true;
case R.id.removeMeal:
LinearLayout removeMe = (LinearLayout)findViewById(trackMealItems);
removeMe.setVisibility(View.GONE);
trackMealItems--;
return true;
}
return super.onOptionsItemSelected(item);
}
#Override
public void onClick(View v){
EditText mealCaloriesInTextBox = (EditText)findViewById(mealCalId);
}
You seem to be using two different values: MealCalId when you create your EditText and mealCalId when you call findViewById. That's one possible problem. The other is that if you have more than one view with the same id, findViewById will not necessarily return the one you want.
EDIT
At first glance, your code looks like it should work. I don't know what's going wrong, but I have a suggestion for a work-around. When you create the view, instead of assigning it an ID, assign it a tag:
mealCalories.setTag(mealCalId);
(The int value will be autoboxed to an Integer.) Then in your onClick handler, retrieve it by tag:
EditText mealCaloriesInTextBox =
(EditText) getContentView().findViewWithTag(mealCalId);
If there's any kind of funny interaction with view IDs, this technique will avoid them.
If that doesn't work (or if you prefer anyway) you can also try diagnosing the ID-based retrieval using the Hierarchy Viewer.
For those who are having this error for the same reason I did....
Just try cleaning your project and re-building.
Solved it for me.
i tried to run your code and what i found is that
when menu item is not clicked and button is clicked, the edit text is null.
So if you will call any method on this object, it will crash with NULLPointerException
When menu item is clicked and then button is clicked, the edit text is not null so you call any method on this object.
I have a little problem. In my program I defined
protected Dialog onCreateDialog(int id) {
if (id == CONTEXT_MENU_ID) {
return createMyDialog();
}
return super.onCreateDialog(id);
}
and then show the dialog calling
showDialog(CONTEXT_MENU_ID)
My problem is that sometimes I want to change the texts of the Dialog dynamically between executions. But with that method the Dialog is never recreated. How can I make the createMyDialog() to be called before showing the Dialog?
Thanks
If you want to change dialog settings (text, etc.) you need to do it in onPrepareDialogMethod it will be called each time you call showDialog method
This might be worth a try. I haven't tested it out. To the dialog if you set the textview as its content, then you can set an id to it.
TextView text = new TextView(this);
ViewGroup.LayoutParams vp = new ViewGroup.LayoutParams(LayoutParams.WRAP_CONTENT,
LayoutParams.WRAP_CONTENT);
text.setLayoutParams(vp);
text.setText("HI");
text.setId(1005);
dialog.setContentView(text);
So the next time when you try to update the textview, you might be able to access it using the id.
((TextView)dialog.getWindow().getDecorView().findViewById(1005))
.setText("New Text");
I have an activity that has a TabHost containing a set of TabSpecs each with a listview containing the items to be displayed by the tab. When each TabSpec is created, I set an icon to be displayed in the tab header.
The TabSpecs are created in this way within a setupTabs() method which loops to create the appropriate number of tabs:
TabSpec ts = mTabs.newTabSpec("tab");
ts.setIndicator("TabTitle", iconResource);
ts.setContent(new TabHost.TabContentFactory(
{
public View createTabContent(String tag)
{
...
}
});
mTabs.addTab(ts);
There are a couple of instances where I want to be able to change the icon which is displayed in each tab during the execution of my program. Currently, I am deleting all the tabs, and calling the above code again to re-create them.
mTabs.getTabWidget().removeAllViews();
mTabs.clearAllTabs(true);
setupTabs();
Is there a way to replace the icon that is being displayed without deleting and re-creating all of the tabs?
The short answer is, you're not missing anything. The Android SDK doesn't provide a direct method to change the indicator of a TabHost after it's been created. The TabSpec is only used to build the tab, so changing the TabSpec after the fact will have no effect.
I think there's a workaround, though. Call mTabs.getTabWidget() to get a TabWidget object. This is just a subclass of ViewGroup, so you can call getChildCount() and getChildAt() to access individual tabs within the TabWidget. Each of these tabs is also a View, and in the case of a tab with a graphical indicator and a text label, it's almost certainly some other ViewGroup (maybe a LinearLayout, but it doesn't matter) that contains an ImageView and a TextView. So with a little fiddling with the debugger or Log.i, you should be able to figure out a recipe to get the ImageView and change it directly.
The downside is that if you're not careful, the exact layout of the controls within a tab could change and your app could break. Your initial solution is perhaps more robust, but then again it might lead to other unwanted side effects like flicker or focus problems.
Just to confirm dominics answer, here's his solution in code (that actually works):
tabHost.setOnTabChangedListener(new OnTabChangeListener() {
public void onTabChanged(String tabId) {
if (TAB_MAP.equals(tabId)) {
ImageView iv = (ImageView) tabHost.getTabWidget().getChildAt(0).findViewById(android.R.id.icon);
iv.setImageDrawable(getResources().getDrawable(R.drawable.tab_map_black));
iv = (ImageView) tabHost.getTabWidget().getChildAt(1).findViewById(android.R.id.icon);
iv.setImageDrawable(getResources().getDrawable(R.drawable.tab_list_white));
} else if (TAB_LIST.equals(tabId)) {
ImageView iv = (ImageView) tabHost.getTabWidget().getChildAt(0).findViewById(android.R.id.icon);
iv.setImageDrawable(getResources().getDrawable(R.drawable.tab_map_white));
iv = (ImageView) tabHost.getTabWidget().getChildAt(1).findViewById(android.R.id.icon);
iv.setImageDrawable(getResources().getDrawable(R.drawable.tab_list_black));
}
}
});
Of course it's not polished at all and using those direct indices in getChildAt() is not nice at all...
See my post with code example regarding Customized Android Tabs.
Thanks
Spct
This is what I did and it works for me. I created this function in the activity that extends from TabBarActivity
public void updateTab(int stringID) {
ViewGroup identifyView = (ViewGroup)getTabWidget().getChildAt(0);
TextView v = (TextView)identifyView.getChildAt(identifyView.getChildCount() - 1);
v.setText(stringID);
}
You can modify this function to change the image instead of text or you can change both, also you can modify this to get any tab child. I was particularly interested in modifying the text of the first tab at runtime.
I called this function from the relevant activity using this call
getParent().updateTab(R.string.tab_bar_analyze);
Try This:
tabHost.setOnTabChangedListener(new OnTabChangeListener() {
public void onTabChanged(String tabId) {
if (TAB_MAP.equals(tabId)) {
ImageView iv = (ImageView) tabHost.getTabWidget().getChildAt(0).findViewById(android.R.id.icon);
iv.setImageDrawable(getResources().getDrawable(R.drawable.tab_map_black));
iv = (ImageView) tabHost.getTabWidget().getChildAt(1).findViewById(android.R.id.icon);
iv.setImageDrawable(getResources().getDrawable(R.drawable.tab_list_white));
} else if (TAB_LIST.equals(tabId)) {
ImageView iv = (ImageView) tabHost.getTabWidget().getChildAt(0).findViewById(android.R.id.icon);
iv.setImageDrawable(getResources().getDrawable(R.drawable.tab_map_white));
iv = (ImageView) tabHost.getTabWidget().getChildAt(1).findViewById(android.R.id.icon);
iv.setImageDrawable(getResources().getDrawable(R.drawable.tab_list_black));
}
}
});