Develop Reference

Empty Exposed Dropdown menu when placed inside a custom dialog layout

I'm trying to implement an Exposed Dropdown menu on an AlertDialog with a custom layout defined in dialog_main_createremote.xml:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
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="wrap_content"
android:layout_height="wrap_content"
android:orientation="vertical"
android:padding="10dp">
<com.google.android.material.textfield.TextInputLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:hint="Name"
style="#style/Widget.MaterialComponents.TextInputLayout.OutlinedBox"
android:layout_marginTop="10dp">
<com.google.android.material.textfield.TextInputEditText
android:id="#+id/dialog_main_textinput"
android:layout_width="match_parent"
android:layout_height="wrap_content" />
</com.google.android.material.textfield.TextInputLayout>
<com.google.android.material.textfield.TextInputLayout
style="#style/Widget.MaterialComponents.TextInputLayout.OutlinedBox.ExposedDropdownMenu"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginTop="20dp"
android:hint="Category">
<AutoCompleteTextView
android:id="#+id/dialog_main_dropdown"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_weight="1"
android:inputType="none"/>
</com.google.android.material.textfield.TextInputLayout>
</LinearLayout>
As per Material Design Guidelines, items need a layout for the dropdown menu to appear, so I created the following in the dropdown_item.xml file:
<?xml version="1.0" encoding="utf-8"?>
<TextView
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:padding="16dp"
android:ellipsize="end"
android:maxLines="1"
android:textAppearance="?attr/textAppearanceSubtitle1" />
Finally, I started to generate the AlertDialog with a MaterialAlertDialogBuilder, then defined and instantiated a LayoutInflater which I used to get dialog's custom view and get access to the setAdapter method, but after setting the adapter and showing the dialog all I can get is an Outlined TextInputLayout without any dropdown menu.
So that's it, thanks in advance for any suggestions/solutions, also, as you may have noticed, I'm new to android development, so, if possible and of course, if you have time in your hands, elaborate your answer or point to a specific resource where I could get more info.
MainActivity.java:
public class MainActivity extends AppCompatActivity {
private RemoteListViewModel remoteListViewModel;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
RecyclerView recyclerView = findViewById(R.id.main_recyclerview);
recyclerView.setLayoutManager(new LinearLayoutManager(this));
recyclerView.setHasFixedSize(true);
final RemoteAdapter adapter = new RemoteAdapter();
recyclerView.setAdapter(adapter);
remoteListViewModel = new ViewModelProvider(this).get(RemoteListViewModel.class);
remoteListViewModel.getAllRemotes().observe(this, new Observer<List<Remote>>() {
#Override
public void onChanged(#Nullable List<Remote> remotes) {
adapter.setRemotes(remotes);
}
});
ExtendedFloatingActionButton createButton = findViewById(R.id.create_efab);
createButton.setOnClickListener(new View.OnClickListener() {
public void onClick(View view) {
MaterialAlertDialogBuilder builder = new MaterialAlertDialogBuilder(MainActivity.this);
LayoutInflater inflater = LayoutInflater.from(MainActivity.this);
final View inflatedView = inflater.inflate(R.layout.dialog_main_createremote, null);
AutoCompleteTextView actv = inflatedView.findViewById(R.id.dialog_main_dropdown);
String categories[] = getResources().getStringArray(R.array.categories);
actv.setAdapter(new ArrayAdapter(MainActivity.this, R.layout.dropdown_item, categories));
builder.setView(R.layout.dialog_main_createremote);
builder.setTitle("Set control params");
builder.setNegativeButton("Nope", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int which) {
dialog.dismiss();
}
});
builder.setPositiveButton("Okey", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int which) {
dialog.dismiss();
}
});
builder.show();
}
});
}
}

Opening a dialog box inside adapter returning null values

I have been trying to get this to work without success for about 10 hours now, I have looked all over stack overflow. I am trying to get a simple dialog box to appear and handle some simple input.
It has a TextView as a title, EditText as a input field, and two button continue with the operation or cancel.
For some reason, no matter what I do, I cannot seem to be able to reference ANY view inside my shopping_dialogue xml layout. It gives me this error:
java.lang.NullPointerException: Attempt to invoke virtual method
'void android.widget.TextView.setText(java.lang.CharSequence)' on a
null object reference
I have tried to add an onClick event to the button to see if that works, when I try to reference the button inside the onClick method it gives me the same error. I am using a fragment to do this.
shopping_dialog.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="wrap_content"
android:layout_height="wrap_content">
<TextView
android:id="#+id/shoppingDialogTextView"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:gravity="center"
android:text="Edit Shopping List Name" />
<EditText
android:id="#+id/shoppingDialogEditText"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:ems="30"
android:inputType="textPersonName"
/>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="horizontal">
<Button
android:id="#+id/shoppingDialogOk"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_weight="1"
android:text="Button" />
<Button
android:id="#+id/shoppingDialogCancel"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_weight="1"
android:onClick="k"
android:text="Button" />
</LinearLayout>
shopping_list_row.xml
<?xml version="1.0" encoding="utf-8"?>
<androidx.cardview.widget.CardView xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:card_view="http://schemas.android.com/apk/res-auto"
android:layout_width="match_parent"
card_view:cardCornerRadius="4dp"
android:id="#+id/shoppingList_card_view"
android:layout_margin="10dp"
android:layout_height="200dp">
<LinearLayout
android:id="#+id/shoppingListParent"
android:layout_gravity="center"
android:layout_width="match_parent"
android:orientation="vertical"
android:gravity="center"
android:layout_height="match_parent">
<TextView
android:id="#+id/shoppingName"
android:layout_width="wrap_content"
android:gravity="center"
android:textSize="25sp"
android:textColor="#FFF"
android:layout_height="wrap_content" />
<TextView
android:id="#+id/shoppingDate"
android:layout_width="wrap_content"
android:gravity="center"
android:textSize="25sp"
android:textColor="#FFF"
android:layout_height="wrap_content" />
</LinearLayout>
</androidx.cardview.widget.CardView>
fragment_shopping_list.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical" android:layout_width="match_parent"
android:layout_height="match_parent">
<androidx.recyclerview.widget.RecyclerView
android:id="#+id/shoppingList_recycler_view"
android:layout_width="match_parent"
android:layout_height="match_parent" />
</LinearLayout>
ShopingAdapter.java
public class ShoppingAdapter extends RecyclerView.Adapter<ShoppingAdapter.ShoppingViewHolder> {
private List<ShoppingData> shoppingList;
private Context context;
public ShoppingAdapter(List<ShoppingData> shoppingList, Context context){
this.shoppingList = shoppingList;
this.context = context;
}
#NonNull
#Override
public ShoppingViewHolder onCreateViewHolder(#NonNull ViewGroup viewGroup, int i){
View itemView = LayoutInflater.from(viewGroup.getContext())
.inflate(R.layout.shopping_list_row, viewGroup, false);
return new ShoppingViewHolder(itemView);
}
#Override
public void onBindViewHolder(ShoppingViewHolder viewHolder, int i){
ShoppingData data = shoppingList.get(i);
Random k = new Random();
int color = Color.argb(255,k.nextInt(255),k.nextInt(255),k.nextInt(255));
viewHolder.parent.setBackgroundColor(color);
viewHolder.shoppingName.setText(data.getName());
viewHolder.shoppingDate.setText(data.getDate());
viewHolder.shoppingName.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
AlertDialog.Builder builder1 = new AlertDialog.Builder(v.getContext());
builder1.setCancelable(true);
builder1.setView(R.layout.shopping_dialog);
AlertDialog alert = builder1.create();
/*
EditText text = v.findViewById(R.id.shoppingDialogEditText);
text.setText("Some Text");
This causes a null object reference
*/
alert.show();
}
});
}
#Override
public int getItemCount(){return shoppingList.size();}
public class ShoppingViewHolder extends RecyclerView.ViewHolder{
private TextView shoppingName, shoppingDate;
private LinearLayout parent;
public ShoppingViewHolder(View itemView){
super(itemView);
parent = itemView.findViewById(R.id.shoppingListParent);
shoppingName = itemView.findViewById(R.id.shoppingName);
shoppingDate = itemView.findViewById(R.id.shoppingDate);
}
}
}
ShoppingFragment.java
public class ShoppingFragment extends Fragment {
private RecyclerView recyclerView;
private ShoppingAdapter shoppingAdapter;
private List<ShoppingData> shoppingList = new ArrayList<>();
#NonNull
#Override
public View onCreateView(#NonNull LayoutInflater inflater, #Nullable ViewGroup container,
#Nullable Bundle savedInstanceState){
shoppingList.add(new ShoppingData("k","12/12/12"));
shoppingList.add(new ShoppingData("k","12/12/12"));
shoppingList.add(new ShoppingData("k","12/12/12"));
shoppingList.add(new ShoppingData("k","12/12/12"));
shoppingList.add(new ShoppingData("k","12/12/12"));
shoppingList.add(new ShoppingData("k","12/12/12"));
View rootView = inflater.inflate(R.layout.fragment_shopping_list, container, false);
recyclerView = rootView.findViewById(R.id.shoppingList_recycler_view);
shoppingAdapter = new ShoppingAdapter(shoppingList, getActivity());
RecyclerView.LayoutManager manager = new GridLayoutManager(getActivity(), 2);
recyclerView.setLayoutManager(manager);
recyclerView.setAdapter(shoppingAdapter);
return rootView;
}
public void k(View view){ //the click listern that causes a null object reference when referencing the button
Button button = view.findViewById(R.id.shoppingDialogOk);
button.setText("k");
}
}
ShoppingData.java
package com.uhcl.recipe5nd.helperClasses;
public class ShoppingData {
private String name;
private String date;
public ShoppingData(String name, String date){
this.name = name;
this.date = date;
}
public String getDate(){
return this.date;
}
public String getName(){
return this.name;
}
}
Everything works fine until I try to reference anything inside shopping_dialog.xml.
If you look at my shopping adapter class, what I am trying to do is to add an onClick listener to the "shoppigName" text view inside my onBindViewHolder method. This works, but when I try to reference the shoppingDialogEditText, it causes the app the crash and give me that error.
Like I mentioned I also tried adding a click event method k to a button inside shopping_dialog.xml, and implemented it inside my fragment class to see if that would work, but it still causes the same error.

viewHolder.shoppingName.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
View dailogView = LayoutInflater.from(mContext).inflate(R.layout.shopping_dialog, null);
AlertDialog.Builder builder1 = new AlertDialog.Builder(v.getContext());
builder1.setCancelable(true);
builder1.setView(dailogView);
AlertDialog alert = builder1.create();
EditText text = dailogView.findViewById(R.id.shoppingDialogEditText);
text.setText("Some Text");
alert.show();
}
});
The view your using to the find the edittext is not the view of that dialog box, therefore it's throwing null pointer.

You are using a wrong view to find the editText. It is not the view of dialog box. It is the view of the item which is being clicked rather than dialog box.
Use this
viewHolder.shoppingName.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
View dailogView =
LayoutInflater.from(mContext).inflate(R.layout.shopping_dialog, null);
AlertDialog.Builder builder = new AlertDialog.Builder(v.getContext());
builder.setCancelable(true);
builder.setView(dailogView);
AlertDialog alert = builder.create();
EditText text = dailogView.findViewById(R.id.shoppingDialogEditText);
text.setText("Shopping Dialog Text");
alert.show();
}
});
}

How to fix TextView being rendered blank on new Activity

I'm trying to start another activity after clicking on a CardView inside a RecyclerView. The new activity renders after the click on any of the items inside the RecyclerView (It does the transition and changes the title TextView), but it does not show any of the TextView's inside the CardView on the layout.
The OnClick method is being set as an interface and being implemented in the first Activity.
Here is my first activity. I'm loading the data here from a SQLite database, but it's not relevant for the question to show the code from it.
public class MainActivity extends AppCompatActivity implements RecipeAdapterMain.OnCardListener {
private TextView tv;
ArrayList<RecipeObject> recipes = new ArrayList<>();
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
RecyclerView rv = findViewById(R.id.recipeListMain);
LinearLayoutManager llm = new LinearLayoutManager(this);
rv.setLayoutManager(llm);
RecipeAdapterMain adapter = new RecipeAdapterMain(recipes, this);
rv.setAdapter(adapter);
tv = findViewById(R.id.title);
}
#Override
public void onCardClick(int position) {
Intent intent = new Intent(this, RecipeActivity.class);
startActivity(intent);
}
}
This is my Adapter.
public class RecipeAdapterMain extends RecyclerView.Adapter<RecipeAdapterMain.RecipeListViewHolder> {
RecyclerView mRecyclerView;
ArrayList<RecipeObject> recipeList;
private OnCardListener mOnCardListener;
public RecipeAdapterMain(Context context, ArrayList<RecipeObject> recipeList, OnCardListener onCardListener) {
this.mOnCardListener = onCardListener;
this.recipeList = recipeList;
}
#Override
public void onAttachedToRecyclerView(RecyclerView recyclerView) {
mRecyclerView = recyclerView;
super.onAttachedToRecyclerView(recyclerView);
}
#Override
public RecipeListViewHolder onCreateViewHolder(ViewGroup parent, int i) {
View layoutView = LayoutInflater.from(parent.getContext()).inflate(R.layout.layout_recipe_main, parent, false);
RecipeListViewHolder rcv = new RecipeListViewHolder(layoutView, mOnCardListener);
return rcv;
}
#Override
public void onBindViewHolder(#NonNull RecipeListViewHolder holder, int position) {
holder.mName.setText(recipeList.get(position).getName());
}
#Override
public int getItemCount(){
return recipeList.size();
}
public class RecipeListViewHolder extends RecyclerView.ViewHolder implements View.OnClickListener{
public TextView mName;
OnCardListener onCardListener;
public RecipeListViewHolder(final View view, OnCardListener onCardListener) {
super(view);
mName = view.findViewById(R.id.textViewTitle);
this.onCardListener = onCardListener;
view.setOnClickListener(this);
}
#Override
public void onClick(View v) {
onCardListener.onCardClick(getAdapterPosition());
}
}
public interface OnCardListener {
void onCardClick(int position);
}
}
My second activity:
public class RecipeActivity extends AppCompatActivity {
#Override
public void onCreate(#Nullable Bundle savedInstanceState, #Nullable PersistableBundle persistentState) {
super.onCreate(savedInstanceState, persistentState);
setContentView(R.layout.layout_recipe);
}
}
This is the layout from the second activity. (layout_recipe):
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical" android:layout_width="match_parent"
android:layout_height="wrap_content">
<androidx.cardview.widget.CardView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_gravity="center">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<TextView
android:id="#+id/textViewName"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="This is a test"
android:textColor="#1A1A1A"
android:textSize="18sp" />
<TextView
android:id="#+id/textViewIngr"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="This is a test"
android:textColor="#1A1A1A"
android:textSize="18sp" />
<TextView
android:id="#+id/textViewDire"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="This is a test"
android:textColor="#1A1A1A"
android:textSize="18sp" />
</LinearLayout>
</androidx.cardview.widget.CardView>
</LinearLayout>
And this is the layout from the first activity (activity_main):
<?xml version="1.0" encoding="utf-8"?>
<androidx.coordinatorlayout.widget.CoordinatorLayout 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=".MainActivity">
<com.google.android.material.appbar.AppBarLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:theme="#style/AppTheme.AppBarOverlay">
</com.google.android.material.appbar.AppBarLayout>
<androidx.recyclerview.widget.RecyclerView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="#+id/recipeListMain"
android:scrollbars="vertical">
</androidx.recyclerview.widget.RecyclerView>
<com.google.android.material.floatingactionbutton.FloatingActionButton
android:id="#+id/fab"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
app:backgroundTint="#color/colorAccent"
android:layout_gravity="end|bottom"
android:layout_margin="16dp"
android:layout_marginBottom="16dp"
android:contentDescription="#string/submit"
android:src="#drawable/ic_add_black_24dp"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
android:onClick="openActivityCreate"/>
</androidx.coordinatorlayout.widget.CoordinatorLayout>
From clicking in a Card on the MainActivity, I expected to render the second activity with it's TextViews (This is a test), but it's rendering a blank page instead.

try removing #Nullable PersistableBundle persistentState from onCreate on your second activity

Getting a Null Object Reference when trying to set imageview resource with checkbox

So I have an app with a listview. When you click a listview item it opens a new activity. I placed a checkbox in this new activity where when its checked, it should put a checkmark next to the listview item on the previous screen. I'm running into this error I'm guessing because I'm trying to set the checkbox from the second activity that has a different content view than the listview. I hope I explained that well.
Heres my RouteDetails.java with the checkbox code
public class RouteDetails extends AppCompatActivity {
ImageView routeImage;
String routeName;
CheckBox routeCheckBox;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_route_details);
//back button for route details view
getSupportActionBar().setDisplayHomeAsUpEnabled(true);
///////checkbox///////////////////////////////////////////
routeCheckBox = (CheckBox) findViewById(R.id.routeCheckBox);
final ImageView checkImageView = (ImageView) findViewById(R.id.checkImageView);
routeCheckBox.setOnClickListener(new View.OnClickListener() {
public void onClick(View view)
{
if (routeCheckBox.isChecked())
{
checkImageView.setImageResource(R.drawable.birdsboroicon);
}
}
});
/////////////////////////////////////////////
//sets actionbar title
routeName = getIntent().getExtras().getString("routeName");
getSupportActionBar().setTitle(routeName);
//TextView for route details
final TextView routeDetailsView = (TextView) findViewById(R.id.routeDetailsView);
routeDetailsView.setText(getIntent().getExtras().getCharSequence("route"));
//ImageView for route details
routeImage = (ImageView) findViewById(R.id.routeImage);
final int mImageResource = getIntent().getIntExtra("imageResourceId", 0);
routeImage.setImageResource(mImageResource);
and heres the custom_row.xml that contains the imageview im trying to set based on the checkbox state.
<TextView
android:text="TextView"
android:layout_width="wrap_content"
android:layout_height="51dp"
android:id="#+id/routeText"
android:layout_weight="1"
android:textSize="18sp"
android:gravity="center_vertical"
android:textColor="#android:color/black"
android:typeface="normal"
/>
<ImageView
android:layout_width="35dp"
android:layout_height="35dp"
android:id="#+id/checkImageView" />
So I want the checkmark to be next to the listview item after the back button is pressed.
Ill include this other code if it is relavent
heres my RouteDetails.xml that contains the checkbox
<ScrollView xmlns:android="http://schemas.android.com/apk/res/android"
android:id="#+id/scrollView1"
android:layout_width="match_parent"
android:layout_height="match_parent">
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:id="#+id/activity_route_details"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:paddingBottom="#dimen/activity_vertical_margin"
android:paddingLeft="#dimen/activity_horizontal_margin"
android:paddingRight="#dimen/activity_horizontal_margin"
android:paddingTop="#dimen/activity_vertical_margin"
tools:context="com.example.zach.listview.RouteDetails">
<CheckBox
android:text="Route Climbed"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="#+id/routeCheckBox"
android:gravity="center" />
<TextView
android:text="TextView"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="#+id/routeDetailsView"
android:textSize="18sp"
android:textAlignment="center"
android:textColor="#android:color/black"
android:layout_below="#id/routeCheckBox"/>
<ImageView
android:layout_below="#id/routeDetailsView"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="#+id/routeImage"
android:scaleType="fitCenter"
android:layout_alignParentBottom="true"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true"
android:adjustViewBounds="true" />
</RelativeLayout>
</ScrollView>
My Custom adapter.java which creates each listview row
class CustomAdapter extends ArrayAdapter<CharSequence>{
public CustomAdapter(Context context, CharSequence[] routes) {
super(context, R.layout.custom_row ,routes);
}
#NonNull
#Override
public View getView(int position, View convertView, ViewGroup parent) {
LayoutInflater routeInflater = LayoutInflater.from(getContext());
View customView = convertView;
if(customView == null){customView = routeInflater.inflate(R.layout.custom_row, parent, false);}
CharSequence singleRoute = getItem(position);
TextView routeText = (TextView) customView.findViewById(R.id.routeText);
routeText.setText(singleRoute);
return customView;
}
my mainavtivity.java which is where the listview is populated
public class MainActivity extends AppCompatActivity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
//Action Bar customization
final android.support.v7.app.ActionBar actionBar = getSupportActionBar();
actionBar.setDisplayOptions(android.support.v7.app.ActionBar.DISPLAY_SHOW_CUSTOM);
actionBar.setCustomView(R.layout.actionbar);
setContentView(R.layout.activity_main);
///// fill listview numbers I want to add
final String[] routeListviewNumbers = getResources().getStringArray(R.array.routeNumbers);
//fill list view with xml array of routes
final CharSequence[] routeListViewItems = getResources().getTextArray(R.array.routeList);
//fills route detail text view with xml array info
final CharSequence[] routeDetail= getResources().getTextArray(R.array.routeDetail);
//fills route detail image view with xml array of images
final TypedArray image = getResources().obtainTypedArray(R.array.routeImages);
//image.recycle();
//custom adapter for list view
ListAdapter routeAdapter = new CustomAdapter(this, routeListViewItems);
final ListView routeListView = (ListView) findViewById(R.id.routeListView);
routeListView.setAdapter(routeAdapter);
routeListView.setOnItemClickListener(
new AdapterView.OnItemClickListener() {
#Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
CharSequence route = routeListViewItems[position];
int imageId = (int) image.getResourceId(position, -1);
if (route.equals(routeListViewItems[position]))
{
Intent intent = new Intent(view.getContext(), RouteDetails.class);
intent.putExtra("route", routeDetail[position]);
intent.putExtra("imageResourceId", imageId);
intent.putExtra("routeName", routeListViewItems[position]);
startActivity(intent);
}
}
}
);
}
}
and my activitymain.xml which is the listview
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:id="#+id/activity_main"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingBottom="0dp"
android:paddingLeft="5dp"
android:paddingRight="5dp"
android:paddingTop="0dp"
tools:context="com.example.zach.listview.MainActivity">
<ListView
android:layout_width="match_parent"
android:layout_height="match_parent"
android:id="#+id/routeListView"
android:layout_alignParentRight="true"
android:layout_alignParentEnd="true" />
</RelativeLayout>
Edit: So I added this to my RouteDetails.java
routeCheckBox.setOnClickListener(new View.OnClickListener() {
public void onClick(View view)
{
if (routeCheckBox.isChecked())
{
//checkImageView.setImageResource(R.drawable.checkmark);
Intent check = new Intent(RouteDetails.this,CustomAdapter.class);
check.putExtra("checkImageResource", R.drawable.checkmark);
startActivity(check);
}
}
});
and this to my customAdapter.java
////////trying to set checkmark/////
ImageView checkImageView = (ImageView) customView.findViewById(R.id.checkImageView);
checkImageView.setImageResource(((Activity) getContext()).getIntent().getIntExtra("checkImageResource",0));
////////////////////////////////////////
but this is not working either. It says fatal exception unable to find explicit activity class. It's doing this I guess since CustomAdapter is not an activity, but customadapter is linked to my custom_row which contains the imageview I want to add the checkbox to. How would I do this? I'm not sure what else to try
Edit: I still haven't found a solution if anyone has any suggestions!

How to change ImageView source from different XML?

I want to change images in my popupwindow. I am trying to change ImageView image source which is in test.xml while my contentView is activity_main. When I try to just call imageView.setImageResource(android.R.drawable.ic_menu_help); it gives me nullpointerexception I realized i have to use inflate method, but when I use it it doesn't do what I want.I know there is a lot of questions regarding this, but none of them really helped me.
This is activity_main.xml:
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:id="#+id/relative"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context="com.example.android.popupwindow.MainActivity">
<Button
android:text="Test"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="#+id/button"
android:layout_centerVertical="true"
android:layout_alignParentRight="true"
android:layout_alignParentEnd="true"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true" />
</RelativeLayout>
test.xml:
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="horizontal"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#android:color/holo_blue_dark"
android:id="#+id/test1"
>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="#+id/linear1">
<ImageView
android:layout_width="75dp"
android:layout_height="75dp"
android:src="#android:drawable/btn_star_big_on"
android:id="#+id/imageView1"
android:layout_weight="1"
/>
</LinearLayout>
</RelativeLayout>
my main.java:
public class MainActivity extends AppCompatActivity {
private PopupWindow popupWindow;
private RelativeLayout relativeLayout;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Button test = (Button) findViewById(R.id.button);
relativeLayout = (RelativeLayout) findViewById(R.id.relative);
final View view1 = getLayoutInflater().inflate(R.layout.test, null);
ImageView imageView = (ImageView) view1.findViewById(R.id.imageView1);
imageView.setImageResource(android.R.drawable.ic_menu_help); //Image source is not changed in my popupWindow,
// but it is changed when I call relativeLayout.addView(view1);
test.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
//relativeLayout.addView(view1); // <-- this does the trick, but its not what i want
View container = getLayoutInflater().inflate(R.layout.test, null);
popupWindow = new PopupWindow(container, android.app.ActionBar.LayoutParams.MATCH_PARENT, android.app.ActionBar.LayoutParams.WRAP_CONTENT, true);
popupWindow.showAtLocation(relativeLayout, Gravity.BOTTOM, 0, 0);
container.setOnTouchListener(new View.OnTouchListener() {
#Override
public boolean onTouch(View view, MotionEvent motionEvent) {
popupWindow.dismiss();
return true;
}
});
}
});
}
}

You're inflating two separate views. Obviously what you do in one will have no impact on the other. You should set the popup view to your originally inflated view:
popupWindow = new PopupWindow(view1,
RelativeLayout.LayoutParams.MATCH_PARENT,
RelativeLayout.LayoutParams.WRAP_CONTENT,
true);