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How to open a new activity from a dialog fragment

My program opens a DialogFragment class while running in MainActivity.java
I want to be able to click on the "neutral button" of that dialog and open a new activity, SensorDataDisplay.java
I am having trouble finding the right way to reference the Context in my button's onClick.
package com.august.customtisensortagclient;
import android.app.AlertDialog;
import android.app.Dialog;
import android.content.Context;
import android.content.DialogInterface;
import android.content.Intent;
import android.os.Bundle;
import android.support.v4.app.DialogFragment;
import java.util.ArrayList;
public class GetInfoDialog extends DialogFragment {
#Override
public Dialog onCreateDialog(Bundle savedInstanceState) {
final String thisWhichGetInfoDialog = ((MainActivity)getActivity()).getWhichGetInfoDialog();
final ArrayList<String> thisScannedDevicesArrayList =
((MainActivity)getActivity()).getScannedDevicesArrayList();
final int thisIsInLeftConnectedDeviceDisplay = ((MainActivity)getActivity()).getIsInLeftConnectedDeviceDisplay();
final int thisIsInRightConnectedDeviceDisplay = ((MainActivity)getActivity()).getIsInRightConnectedDeviceDisplay();
int thisIsInThisConnectedDeviceDisplay = 0;
if (thisWhichGetInfoDialog == "Left") {
thisIsInThisConnectedDeviceDisplay = thisIsInLeftConnectedDeviceDisplay;
} else if (thisWhichGetInfoDialog == "Right")
thisIsInThisConnectedDeviceDisplay = thisIsInRightConnectedDeviceDisplay;
AlertDialog.Builder builder = new AlertDialog.Builder(getActivity());
builder.setTitle(thisWhichGetInfoDialog + " Sensor Info");
builder.setMessage("MAC Address: " + thisScannedDevicesArrayList.get(thisIsInThisConnectedDeviceDisplay));
builder.setNeutralButton("View Data", new DialogInterface.OnClickListener() {
#Override
public void onClick(DialogInterface dialog, int which) {
Intent myIntent = new Intent(?????, SensorDataDisplay.class);
myIntent.putExtra("key", "TEST VALUE"); //Optional parameters
?????.startActivity(myIntent);
}
});
builder.setNegativeButton("Done", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int id) {
// User cancelled the dialog
}
});
return builder.create();
}
}

DialogFragment has getActivity() and getContext() methods (which it inherits from Fragment), both will work in your case. If you're having trouble accessing these methods from the anonymous class (which shouldn't be the case), you can use the GetInfoDialog.this.getActivity() syntax.

getActivity() returns the Activity the fragment is attached to
builder.setNeutralButton("View Data", new DialogInterface.OnClickListener() {
#Override
public void onClick(DialogInterface dialog, int which) {
Intent myIntent = new Intent(getActivity(), SensorDataDisplay.class);
myIntent.putExtra("key", "TEST VALUE"); //Optional parameters
getActivity().startActivity(myIntent);
}
});

Alert Dialog not displaying due to IllegalStateException

When I click on any listview row, instead of showing the alert dialog box, it gives an IllegalStateException.
It says to use a Theme.AppCompat theme. I dont know much about this and I am new could anyone plese help me understand all these appcompat activity and the reason for this trouble.
java.lang.IllegalStateException: You need to use a Theme.AppCompat theme (or descendant) with this activity.
at android.support.v7.app.AppCompatDelegateImplV9.createSubDecor(AppCompatDelegateImplV9.java:355)
at android.support.v7.app.AppCompatDelegateImplV9.ensureSubDecor(AppCompatDelegateImplV9.java:324)
at android.support.v7.app.AppCompatDelegateImplV9.setContentView(AppCompatDelegateImplV9.java:285)
at android.support.v7.app.AppCompatDialog.setContentView(AppCompatDialog.java:83)
at android.support.v7.app.AlertController.installContent(AlertController.java:225)
at android.support.v7.app.AlertDialog.onCreate(AlertDialog.java:257)
at android.app.Dialog.dispatchOnCreate(Dialog.java:397)
at android.app.Dialog.show(Dialog.java:298)
at com.example.stark.messenger.showDatabase$1.onItemClick(showDatabase.java:93)
at android.widget.AdapterView.performItemClick(AdapterView.java:310)
at android.widget.AbsListView.performItemClick(AbsListView.java:1145)
at android.widget.AbsListView$PerformClick.run(AbsListView.java:3081)
at android.widget.AbsListView$3.run(AbsListView.java:3947)
at android.os.Handler.handleCallback(Handler.java:739)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:148)
at android.app.ActivityThread.main(ActivityThread.java:5441)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:738)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:628)
The code for my main activity is:
import android.content.DialogInterface;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteOpenHelper;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ListView;
import java.util.ArrayList;
public class showDatabase extends AppCompatActivity {
SQLiteOpenHelper expensedatabase;
SQLiteDatabase db;
Cursor cursor;
ListView lv;
ArrayList<DataModel> dataModels;
private static CustomAdapter adapter;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_show_database);
lv=(ListView) findViewById(R.id.lv_custom_list);
expensedatabase = new ExpenseDatabase(this);
db = expensedatabase.getReadableDatabase();
}
protected void onStart()
{
super.onStart();
dataModels = new ArrayList<DataModel>();
dataModels.clear();
cursor = db.rawQuery("select * from ExpenseRecord where strftime('%Y-%m', DATE) = '2017-04';",null);
if (cursor != null && cursor.getCount() != 0) {
if (cursor.moveToFirst()) {
do {
DataModel datamodelItems = new DataModel();
datamodelItems.setPayee(cursor.getString(cursor
.getColumnIndex("PAYEE")));
datamodelItems.setAmount(cursor.getString(cursor
.getColumnIndex("AMOUNT")));
datamodelItems.setCategory(cursor.getString(cursor
.getColumnIndex("CATEGORY")));
datamodelItems.setNotes(cursor.getString(cursor
.getColumnIndex("NOTES")));
datamodelItems.setDate(cursor.getString(cursor
.getColumnIndex("DATE")));
datamodelItems.setTime(cursor.getString(cursor
.getColumnIndex("TIME")));
dataModels.add(datamodelItems);
} while (cursor.moveToNext());
}
}
cursor.close();
CustomAdapter customadapter = new CustomAdapter(dataModels,getApplicationContext());
lv.setAdapter(customadapter);
lv.setOnItemClickListener(itemlistener);
}
AdapterView.OnItemClickListener itemlistener = new AdapterView.OnItemClickListener() {
#Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
final android.support.v7.app.AlertDialog.Builder builder = new android.support.v7.app.AlertDialog.Builder(getApplicationContext());
builder.setView(R.layout.dialog_box)
.setPositiveButton("Update", new DialogInterface.OnClickListener() {
public void onClick(final DialogInterface dialog, final int id) {
//update click
}
})
.setNeutralButton("Disable", new DialogInterface.OnClickListener() {
public void onClick(final DialogInterface dialog, final int id) {
//disable click
}
})
.setNegativeButton("Cancel", new DialogInterface.OnClickListener() {
public void onClick(final DialogInterface dialog, final int id) {
//cancel click
}
});
if(position>-1) {
android.support.v7.app.AlertDialog alert = builder.create();
alert.show();
}
}
};
public void onDestroy(){
super.onDestroy();
cursor.close();
db.close();
}
}

Try adding
android:theme="#style/Theme.AppCompat.Light"
to the application tag in the AndroidManifest.xml file.
As suggested in this post.
You need to use a Theme.AppCompat theme (or descendant) with this activity

Cant display the item of my List View

I have a project for my school making a FAB and floating label.
The question is, the item on the list view is not diplayed and i having a hard time fixing on that.
I have two java class. MainActivity.java and MyCustomAdapter.java
Here is code for MainActivity.java
package com.example.sugara.floatingaction_mario;
import android.app.AlertDialog;
import android.content.DialogInterface;
import android.os.Bundle;
import android.preference.DialogPreference;
import android.support.design.widget.FloatingActionButton;
import android.support.v7.app.AppCompatActivity;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ListView;
import android.widget.Toast;
import java.util.ArrayList;
public class MainActivity extends AppCompatActivity {
private ListView myList;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
myList = (ListView) findViewById(R.id.list);
myList.setOnItemClickListener(new AdapterView.OnItemClickListener() {
#Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
Toast.makeText(MainActivity.this, "Row " + position + " clicked", Toast.LENGTH_SHORT).show();
}
});
FloatingActionButton FAB = (FloatingActionButton) findViewById(R.id.fab);
FAB.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
showInputDialog();
}
});
final ArrayList list = new ArrayList<>();
list.add("Richard Felmon age 23");
list.add("Nestor Mersy age 44");
list.add("Bruto Char age 12");
list.add("Filemon Mandela age 33");
list.add("Sukyuu Nirasu age 39");
// final MainActivity adapter = new MyCustomAdapter(MainActivity.this, list);
// myList.setAdapter(adapter);
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
getMenuInflater().inflate(R.menu.menu_main, menu);
return true;
}
#Override
public boolean onOptionsItemSelected(MenuItem item) {
int id = item.getItemId();
//noinspection SimplifiableIfStatement
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
protected void showInputDialog() {
LayoutInflater layoutInflater = LayoutInflater.from(MainActivity.this);
View promptView = layoutInflater.inflate(R.layout.activity_second, null);
AlertDialog.Builder alertDialogBuilder = new AlertDialog.Builder(MainActivity.this);
alertDialogBuilder.setView(promptView);
alertDialogBuilder.setCancelable(false).setPositiveButton("Save", new DialogInterface.OnClickListener() {
#Override
public void onClick(DialogInterface dialog, int id) {
Toast.makeText(getApplicationContext(), "Data saved ", Toast.LENGTH_LONG).show();
}
}).setNegativeButton("Cancel", new DialogInterface.OnClickListener() {
#Override
public void onClick(DialogInterface dialog, int id) {
dialog.cancel();
}
});
AlertDialog alert = alertDialogBuilder.create();
alert.show();
}
}
And here is my MyCustomAdapter.java
package com.example.sugara.floatingaction_mario;
import android.content.Context;
import android.os.Bundle;
import android.support.design.widget.TextInputLayout;
import android.support.v7.app.AppCompatActivity;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.EditText;
import android.widget.TextView;
import java.util.ArrayList;
public class MyCustomAdapter extends AppCompatActivity {
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_second);
//Displaying TextInputLayout Error
TextInputLayout lNameLayout = (TextInputLayout) findViewById(R.id.lNameLayout);
lNameLayout.setErrorEnabled(true);
lNameLayout.setError("Min 2 chars required");
//Displaying EditText Error
EditText age = (EditText) findViewById(R.id.age);
age.setError("Required");
}
}
I have tried making adapter for listview but when i do so
It is clashing with
public class MyCustomAdapter extends AppCompatActivity {
Can you help me fixing this and make the input displayed on the listview too?
I am sorry if it's confusing, it's my first time posting a question like this

If you want only text in the ListView than you may not customize the Adapter Class.
Please use this. This will help you.
Create layout with TextView(layout_list.xml)
<?xml version="1.0" encoding="utf-8"?>
<TextView xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:padding="10dp"
android:textSize="20sp" >
</TextView>
Modify MainActivity.java like this.
...
final ArrayList list = new ArrayList<>();
list.add("Richard Felmon age 23");
list.add("Nestor Mersy age 44");
list.add("Bruto Char age 12");
list.add("Filemon Mandela age 33");
list.add("Sukyuu Nirasu age 39");
myList.setAdapter(new ArrayAdapter<String>(this, R.layout.layout_list, list));

Your Adapter must extend an Adapter class of Android. Try
public class MyCustomAdapter extends BaseAdapter {
and then implementing the necessary methods.

How do I change my Activity's fragment container's background with a custom dialog with code?

Fairly new to Android and I am trying to do some background color changes. Basically I have a main activity that only has a FrameLayout in it's xml. When the activity is created it opens up a fragment for my program. I have a menu item that when clicked pops a dialog box with 3 seekbars(red, green, blue). I want to change the background color to whatever the seekbars position is. I have all the code finished for the seekbars and I know it works on a simple app I created. For reasons to me unknown my app fails when i try to open the dialog box. What is the proper way to set this up in the Main Activity? I want the user to be able to change the background color whenever they want. All my fragment layouts are transparent. This is the tutorial I have been working off of. http://android-er.blogspot.com/2009/08/change-background-color-by-seekbar.html Any advice would be great. I think my problem is I do not fully understand how to access my main_activity's FrameLayout from with-in my MainActivity java class.
activity_main.xml
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".MainActivity"
android:orientation="vertical"
android:background="#e3a153">
<FrameLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:id="#+id/fragmentView"></FrameLayout>
</LinearLayout>
Color_seekbar_selecter.xml
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:id="#+id/myScreen"
>
<TextView
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="Change color"
/>
<SeekBar
android:id="#+id/mySeekingBar_R"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:max="255"
android:progress="0"/>
<SeekBar
android:id="#+id/mySeekingBar_G"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:max="255"
android:progress="0"/>
<SeekBar
android:id="#+id/mySeekingBar_B"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:max="255"
android:progress="0"/>
</LinearLayout>
menu_main.xml
<menu 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"
tools:context=".MainActivity">
<item android:id="#+id/menu_settings"
android:title="Green" />
<item android:id="#+id/menu_red"
android:title="Red" />
<item android:id="#+id/menu_blue"
android:title="Blue" />
<item android:id="#+id/menu_tan"
android:title="Tan" />
</menu>
MainActivity.java
import android.annotation.TargetApi;
import android.app.AlertDialog;
import android.app.Dialog;
import android.content.Context;
import android.content.res.Configuration;
import android.graphics.Color;
import android.os.Build;
import android.support.v7.app.ActionBarActivity;
import android.os.Bundle;
import android.text.Layout;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.MenuInflater;
import android.view.MenuItem;
import android.view.View;
import android.widget.FrameLayout;
import android.widget.LinearLayout;
import android.widget.SeekBar;
import android.widget.Toast;
import java.util.zip.Inflater;
public class MainActivity extends ActionBarActivity {
//public CategoryFragment categoryFragment;
//public RecipeFragment recipeFragment;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
if(savedInstanceState == null)
{
CategoryFragment categoryFragment = new CategoryFragment();
getSupportFragmentManager().beginTransaction()
.add(R.id.fragmentView, categoryFragment, "categoryFrag")
.commit();
}
}
#Override
public void onConfigurationChanged(Configuration newConfig) {
super.onConfigurationChanged(newConfig);
if (newConfig.orientation == Configuration.ORIENTATION_LANDSCAPE) {
Toast.makeText(this, "landscape", Toast.LENGTH_SHORT).show();
} else if (newConfig.orientation == Configuration.ORIENTATION_PORTRAIT){
Toast.makeText(this, "portrait", Toast.LENGTH_SHORT).show();
}
}
#Override
protected void onDestroy() {
super.onDestroy();
}
#Override
protected void onPostResume() {
super.onPostResume();
}
#Override
protected void onPause() {
super.onPause();
}
#Override
protected void onResume() {
super.onResume();
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
MenuInflater inflater = getMenuInflater();
inflater.inflate( R.menu.menu_main, menu);
return true;
}
#Override
public boolean onOptionsItemSelected(MenuItem item) {
switch(item.getItemId())
{
case R.id.menu_green:
}
return super.onOptionsItemSelected(item);
}
}
I have tried for hours to figure this out, but I just don't know where to put what.
This is the code from the example that I found in the link posted above.
import android.app.Activity;
import android.os.Bundle;
import android.widget.LinearLayout;
import android.widget.SeekBar;
public class SeekColorActivity extends Activity {
private int seekR, seekG, seekB;
SeekBar redSeekBar, greenSeekBar, blueSeekBar;
LinearLayout mScreen;
/** Called when the activity is first created. */
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
mScreen = (LinearLayout) findViewById(R.id.myScreen);
redSeekBar = (SeekBar) findViewById(R.id.mySeekingBar_R);
greenSeekBar = (SeekBar) findViewById(R.id.mySeekingBar_G);
blueSeekBar = (SeekBar) findViewById(R.id.mySeekingBar_B);
updateBackground();
redSeekBar.setOnSeekBarChangeListener(seekBarChangeListener);
greenSeekBar.setOnSeekBarChangeListener(seekBarChangeListener);
blueSeekBar.setOnSeekBarChangeListener(seekBarChangeListener);
}
private SeekBar.OnSeekBarChangeListener seekBarChangeListener
= new SeekBar.OnSeekBarChangeListener()
{
#Override
public void onProgressChanged(SeekBar seekBar, int progress,
boolean fromUser) {
// TODO Auto-generated method stub
updateBackground();
}
#Override
public void onStartTrackingTouch(SeekBar seekBar) {
// TODO Auto-generated method stub
}
#Override
public void onStopTrackingTouch(SeekBar seekBar) {
// TODO Auto-generated method stub
}
};
private void updateBackground()
{
seekR = redSeekBar.getProgress();
seekG = greenSeekBar.getProgress();
seekB = blueSeekBar.getProgress();
mScreen.setBackgroundColor(
0xff000000
+ seekR * 0x10000
+ seekG * 0x100
+ seekB
);
}
}
categoryFragment.java
package com.example.mikesgamerig.finalproject;
import android.app.AlertDialog;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.EditText;
import android.widget.ListView;
import java.util.ArrayList;
import java.util.List;
public class CategoryFragment extends Fragment {
private ArrayList<String> categoryNameArrayList;
private ArrayAdapter<String> adapter;
private AlertDialog alertDialog;
private AlertDialog alertDialogDelete;
private EditText categoryEditText;
private String getCategoryName;
private List<Category> cats;
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
//create view
View rootView = inflater.inflate(R.layout.fragment_category, container, false);
//initialize all variables and widgets
inflater = getLayoutInflater(savedInstanceState);
alertDialog = new AlertDialog.Builder(getActivity()).create();
alertDialog.setView(inflater.inflate(R.layout.dialog_add_category, null));
alertDialogDelete = new AlertDialog.Builder(getActivity()).create();
alertDialogDelete.setView(inflater.inflate(R.layout.dialog_delete_category, null));
Button buttonAddCategory = (Button) rootView.findViewById(R.id.addCategoryButton);
ListView categoryListView = (ListView) rootView.findViewById(R.id.list);
//Array list to store names of categories
categoryNameArrayList = new ArrayList<String>();
//List of Category Objects
cats = Category.listAll(Category.class);
getCategoryNames();
//iterate through the CategoryList and attach to the ArrayList
//create adapter and fill the listView with all the name of categories
adapter = new ArrayAdapter<String>(getActivity(), R.layout.rowlayout, R.id.label, categoryNameArrayList);
categoryListView.setAdapter(adapter);
//set OnClick listener for the add category Button.
// This calls another method that will open a custom dialog box
buttonAddCategory.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
DisplayAddCategoryDialogBox();
}
});
//set an onItemLongClick listener for the ListView.
//First have to setLongClickable to true.
//the OnItemLongClick listener will call a method to open a custom Dialog to delete a category.
categoryListView.setLongClickable(true);
categoryListView.setOnItemLongClickListener(new AdapterView.OnItemLongClickListener() {
#Override
public boolean onItemLongClick(AdapterView<?> adapterView, View view, int i, long l) {
DeleteCategory(i);
return true;
}
});
//opens up a new fragment with a list of recipes for the specific category.
categoryListView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
#Override
public void onItemClick(AdapterView<?> adapterView, View view, int i, long l) {
String name = categoryNameArrayList.get(i);
RecipeFragment fragment = new RecipeFragment();
fragment.SetTitleName(name);
getFragmentManager().beginTransaction()
.setCustomAnimations(R.anim.slide_in_right, R.anim.slide_out_left, R.anim.slide_in_left, R.anim.slide_out_right)
.replace(R.id.fragmentView, fragment)
.addToBackStack(null).commit();
}
});
return rootView;
}
//This method will Display a custom add category Dialog Box.
public void DisplayAddCategoryDialogBox(){
//Show the Dialog box to enter a new category name.
alertDialog.show();
categoryEditText = (EditText) alertDialog.findViewById(R.id.categoryEditText);
Button saveCategoryDialogBtn = (Button) alertDialog.findViewById(R.id.saveBtn);
Button cancelDialogButton = (Button) alertDialog.findViewById(R.id.cancelBtn);
saveCategoryDialogBtn.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
getCategoryName = categoryEditText.getText().toString();
//Log.d("STRING VALUE:", getCategoryName);
Category test = new Category(getCategoryName);
test.save();
categoryNameArrayList.add(test.getName());
//Log.d("added Value: ", test.getName());
adapter.notifyDataSetChanged();
alertDialog.hide();
}
});
cancelDialogButton.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
alertDialog.hide();
}
});
}
//this method will display a custom Delete Category Alert Dialog box.
public void DeleteCategory(final int i)
{
alertDialogDelete.show();
Button noBtn = (Button) alertDialogDelete.findViewById(R.id.noBtn);
noBtn.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
alertDialogDelete.hide();
}
});
Button yesBtn = (Button) alertDialogDelete.findViewById(R.id.yesBtn);
yesBtn.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
String tempString = categoryNameArrayList.get(i);
//Log.d("VALUE OF STRING= ", tempString);
categoryNameArrayList.remove(i);
for (Category category : cats) {
String name = category.getName();
if (name.equals(tempString)) {
category.delete();
}
}
adapter.notifyDataSetChanged();
alertDialogDelete.hide();
}
});
}
//Filles the Array
public void getCategoryNames()
{
for(Category category : cats)
{
String name = category.getName();
categoryNameArrayList.add(name);
}
}
}

How to take text input with DialogFragment in Android?

I am trying to get a value that user enters into a Dialog, using the recommended DialogFragment class for it, the Dialog constructs and runs fine, but I cannot return the value of the EditText parameter to the parent class, without get a NullPointerException.
My DialogHost class, this constructs, returns and links the parent to its buttons.
package jo.app.co;
import android.app.Activity;
import android.app.AlertDialog;
import android.app.Dialog;
import android.app.DialogFragment;
import android.content.DialogInterface;
import android.os.Bundle;
import android.view.LayoutInflater;
public class DialogHost extends DialogFragment {
public interface NoticeDialogListener {
public void onDialogPositiveClick(DialogFragment dialog);
public void onDialogNegativeClick(DialogFragment dialog);
}
NoticeDialogListener mListener;
#override
public void onAttach(Activity activity) {
super.onAttach(activity);
try {
mListener = (NoticeDialogListener) activity;
} catch (ClassCastException e) {
throw new ClassCastException(activity.toString());
}
}
#override
public Dialog onCreateDialog(Bundle savedInstanceState) {
AlertDialog.Builder builder = new AlertDialog.Builder(getActivity());
LayoutInflater inflater = getActivity().getLayoutInflater();
builder.setView(inflater.inflate(R.layout.dialog_add, null))
.setPositiveButton("Save", new DialogInterface.OnClickListener() {
#override
public void onClick(DialogInterface dialog, int id) {
mListener.onDialogPositiveClick(DialogHost.this);
}
})
.setNegativeButton("Cancel", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int id) {
DialogHost.this.getDialog().cancel();
}
});
return builder.create();
}
}
This is my MainActivity class showing the dialog
package jo.app.co;
import android.app.DialogFragment;
import android.os.Bundle;
import android.support.v4.app.FragmentActivity;
import android.util.Log;
import android.widget.EditText;
public class MainActivity extends FragmentActivity implements DialogHost.NoticeDialogListener {
#override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
showNoticeDialog();
}
public void showNoticeDialog() {
DialogFragment dialog = new DialogHost();
dialog.show(getFragmentManager(), "DialogHost");
}
#override
public void onDialogPositiveClick(DialogFragment dialog) {
EditText myText = (EditText) findViewById(R.id.item_added);
try {
Log.d ("IN TRY", myText.getText().toString());
}
catch (Exception e) {
Log.e ("IN CATCH", e.toString());
}
}
#override
public void onDialogNegativeClick(DialogFragment dialog) {
Log.d ("INMAIN", "REACHED NEG");
}
}
Thisthe layout of my Dialog for reference.
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="wrap_content"
android:layout_height="wrap_content">
<EditText
android:id="#+id/item_added"
android:inputType="text"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginTop="16dp"
android:layout_marginLeft="4dp"
android:layout_marginRight="4dp"
android:layout_marginBottom="4dp"
android:hint="#string/hint_add_item" />
</LinearLayout>

There seems to be problem with the way you are referring to the edit text. You need to get it from the view you inflated Please try the below code which adds all functionality in your main activity itself. If you want you can adapt to your case with a separate class:
public void showNoticeDialog() {
public String inputvalue;
LayoutInflater inflater = LayoutInflater.from(this);
final View textenter = inflater.inflate(R.layout.dialog_add, null)
final EditText userinput = (EditText) textenter.findViewById(R.id.item_added);
final AlertDialog.Builder builder = new AlertDialog.Builder(this);
builder.setView(textenter)
.setTitle("Your title");
builder.setPositiveButton("Save", new DialogInterface.OnClickListener() {
#override
public void onClick(DialogInterface dialog, int id) {
inputvalue = userinput.getText().toString();
// Do something with value in inputvalue
}
})
.setNegativeButton("Cancel", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int id) {
dialog.cancel();
}
});
AlertDialog dialog = builder.create();
builder.show();
}
For alert dialog , you need to inflate an xml, only if you are planning to have multiple views like more than 1 edittext in that dialog. If you plan to have only 1 edittext as in your example, you dont need an xml and you can directly define an edittext and set it as the view of the alert dialog.
final EditText userinput = new EditText(context);
builder.setView(userinput);