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Why is second floating action button not working?

I'm a beginner in android app making and I'm trying to do an app for a project. I found this tutorial and I'm currently trying to put to apps together in android studio. Both are reminders apps, however the second one (the food one), the FAB is not working it register the touch but when it does it says APP keeps stopping. If anybody can help me I'll appreciated.
First Reminder .java
public class MedicineActivity extends AppCompatActivity {
#BindView(R.id.compactcalendar_view)
CompactCalendarView mCompactCalendarView;
#BindView(R.id.date_picker_text_view)
TextView datePickerTextView;
#BindView(R.id.date_picker_button)
RelativeLayout datePickerButton;
#BindView(R.id.toolbar)
Toolbar toolbar;
#BindView(R.id.collapsingToolbarLayout)
CollapsingToolbarLayout collapsingToolbarLayout;
#BindView(R.id.app_bar_layout)
AppBarLayout appBarLayout;
#BindView(R.id.contentFrame)
FrameLayout contentFrame;
#BindView(R.id.fab_add_task)
FloatingActionButton fabAddTask;
#BindView(R.id.coordinatorLayout)
CoordinatorLayout coordinatorLayout;
#BindView(R.id.date_picker_arrow)
ImageView arrow;
private MedicinePresenter presenter;
private SimpleDateFormat dateFormat = new SimpleDateFormat("MMM dd", /*Locale.getDefault()*/Locale.ENGLISH);
private boolean isExpanded = false;
public ImageButton imageButton;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_medicine);
ButterKnife.bind(this);
setSupportActionBar(toolbar);
imageButton = (ImageButton) findViewById(R.id.image2button);
imageButton.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
Intent intent= new Intent(MedicineActivity.this,dashboard_screen.class);
startActivity(intent);
}
});
mCompactCalendarView.setLocale(TimeZone.getDefault(), /*Locale.getDefault()*/Locale.ENGLISH);
mCompactCalendarView.setShouldDrawDaysHeader(true);
mCompactCalendarView.setListener(new CompactCalendarView.CompactCalendarViewListener() {
#Override
public void onDayClick(Date dateClicked) {
setSubtitle(dateFormat.format(dateClicked));
Calendar calendar = Calendar.getInstance();
calendar.setTime(dateClicked);
int day = calendar.get(Calendar.DAY_OF_WEEK);
if (isExpanded) {
ViewCompat.animate(arrow).rotation(0).start();
} else {
ViewCompat.animate(arrow).rotation(180).start();
}
isExpanded = !isExpanded;
appBarLayout.setExpanded(isExpanded, true);
presenter.reload(day);
}
#Override
public void onMonthScroll(Date firstDayOfNewMonth) {
setSubtitle(dateFormat.format(firstDayOfNewMonth));
}
});
setCurrentDate(new Date());
MedicineFragment medicineFragment = (MedicineFragment) getSupportFragmentManager().findFragmentById(R.id.contentFrame);
if (medicineFragment == null) {
medicineFragment = MedicineFragment.newInstance();
ActivityUtils.addFragmentToActivity(getSupportFragmentManager(), medicineFragment, R.id.contentFrame);
}
//Create MedicinePresenter
presenter = new MedicinePresenter(Injection.provideMedicineRepository(MedicineActivity.this), medicineFragment);
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
getMenuInflater().inflate(R.menu.medicine_menu, menu);
return true;
}
#Override
public boolean onOptionsItemSelected(MenuItem item) {
if (item.getItemId() == R.id.menu_stats) {
Intent intent = new Intent(this, MonthlyReportActivity.class);
startActivity(intent);
}
return super.onOptionsItemSelected(item);
}
public void setCurrentDate(Date date) {
setSubtitle(dateFormat.format(date));
mCompactCalendarView.setCurrentDate(date);
}
public void setSubtitle(String subtitle) {
datePickerTextView.setText(subtitle);
}
#OnClick(R.id.date_picker_button)
void onDatePickerButtonClicked() {
if (isExpanded) {
ViewCompat.animate(arrow).rotation(0).start();
} else {
ViewCompat.animate(arrow).rotation(180).start();
}
isExpanded = !isExpanded;
appBarLayout.setExpanded(isExpanded, true);
}
}
First Reminder XML File
<?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:id="#+id/coordinatorLayout"
android:layout_width="match_parent"
android:layout_height="match_parent">
<com.google.android.material.appbar.AppBarLayout
android:id="#+id/app_bar_layout"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:fitsSystemWindows="true"
android:theme="#style/AppTheme.AppBarOverlay"
app:expanded="false"
app:layout_behavior="com.gautam.medicinetime.utils.ScrollingCalendarBehavior">
<com.google.android.material.appbar.CollapsingToolbarLayout
android:id="#+id/collapsingToolbarLayout"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:fitsSystemWindows="true"
android:minHeight="?attr/actionBarSize"
app:contentScrim="?attr/colorPrimary"
app:titleEnabled="false"
app:layout_scrollFlags="scroll|exitUntilCollapsed"
app:statusBarScrim="?attr/colorPrimaryDark">
<LinearLayout
android:id="#+id/compactcalendar_view_container"
android:layout_width="match_parent"
android:layout_height="250dp"
android:paddingTop="?attr/actionBarSize"
app:layout_collapseMode="parallax"
app:layout_collapseParallaxMultiplier="1.0">
<com.github.sundeepk.compactcalendarview.CompactCalendarView
android:id="#+id/compactcalendar_view"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:paddingLeft="10dp"
android:paddingRight="10dp"
app:compactCalendarBackgroundColor="?attr/colorPrimary"
app:compactCalendarCurrentDayBackgroundColor="#FFC107"
app:compactCalendarCurrentSelectedDayBackgroundColor="#BBDEFB"
app:compactCalendarTextColor="#fff"
app:compactCalendarTextSize="12sp" />
</LinearLayout>
<androidx.appcompat.widget.Toolbar
android:id="#+id/toolbar"
style="#style/ToolbarStyle"
android:layout_width="match_parent"
android:layout_height="?attr/actionBarSize"
app:layout_collapseMode="pin"
app:popupTheme="#style/AppTheme.PopupOverlay">
<RelativeLayout
android:id="#+id/date_picker_button"
android:layout_width="match_parent"
android:layout_height="?attr/actionBarSize"
android:background="?android:selectableItemBackground"
android:gravity="center_vertical"
android:clickable="true"
android:focusable="true"
android:orientation="vertical">
<TextView
android:id="#+id/date_picker_text_view"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:ellipsize="end"
android:maxLines="1"
android:textStyle="bold"
android:textSize="18sp"
android:textColor="#android:color/white" />
<ImageView
android:id="#+id/date_picker_arrow"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignBottom="#id/date_picker_text_view"
android:layout_toRightOf="#id/date_picker_text_view"
app:srcCompat="#drawable/ic_arrow_drop_down"
tools:ignore="ContentDescription,RtlHardcoded" />
</RelativeLayout>
</androidx.appcompat.widget.Toolbar>
</com.google.android.material.appbar.CollapsingToolbarLayout>
</com.google.android.material.appbar.AppBarLayout>
<RelativeLayout
android:id="#+id/relativeLayout2"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:backgroundTint="#color/design_default_color_background">
<androidx.constraintlayout.widget.ConstraintLayout
android:layout_width="match_parent"
android:layout_height="match_parent">
<ImageButton
android:id="#+id/image2button"
android:layout_width="48dp"
android:layout_height="50dp"
android:background="#drawable/roundbutton"
android:src="#drawable/menu_icon"
android:text="Button"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="0.046"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintVertical_bias="0.976" />
</androidx.constraintlayout.widget.ConstraintLayout>
</RelativeLayout>
<com.google.android.material.floatingactionbutton.FloatingActionButton
android:id="#+id/fab_add_task"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_margin="#dimen/sixteen_dp"
app:fabSize="normal"
app:layout_anchor="#+id/relativeLayout2"
app:layout_anchorGravity="end|bottom"
app:srcCompat="#drawable/ic_add" />
<FrameLayout
android:id="#+id/contentFrame"
android:layout_width="match_parent"
android:layout_height="674dp"
app:layout_behavior="#string/appbar_scrolling_view_behavior" />
</androidx.coordinatorlayout.widget.CoordinatorLayout>
Second Remider .java
public class FoodActivity extends AppCompatActivity {
FloatingActionButton mCreateRem;
RecyclerView mRecyclerview;
ArrayList<Model> dataholder = new ArrayList<Model>();
//Array list to add reminders and display in recyclerview
myAdapter adapter;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_food);
mRecyclerview = (RecyclerView) findViewById(R.id.recyclerView_food);
mRecyclerview.setLayoutManager(new LinearLayoutManager(getApplicationContext()));
mCreateRem = (FloatingActionButton) findViewById(R.id.create_reminder);
//Floating action button to change activity
mCreateRem.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
Intent intent = new Intent(getApplicationContext(), FoodAddReminder.class);
startActivity(intent);
//Starts the new activity to add Reminders
}
});
Cursor cursor = new dbManager(getApplicationContext()).readallreminders();
//Cursor To Load data From the database
while (cursor.moveToNext()) {
Model model = new Model (cursor.getString(1), cursor.getString(2), cursor.getString(3));
dataholder.add(model);
}
adapter = new myAdapter(dataholder);
mRecyclerview.setAdapter(adapter);
//Binds the adapter with recyclerview
}
#Override
public void onBackPressed() {
finish();
//Makes the user to exit from the app
super.onBackPressed();
}
}
Second Reminder XML file
<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout 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=".FoodActivity"
android:id="#+id/Food_Container">
<androidx.appcompat.widget.Toolbar
android:id="#+id/FoodToolbar"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="#color/yellow_light"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="0.0"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:title="What's on you firdge?" />
<androidx.recyclerview.widget.RecyclerView
android:id="#+id/recyclerView_food"
android:layout_width="match_parent"
android:layout_height="0dp"
android:layout_marginTop="8dp"
android:visibility="invisible"
app:layout_constraintBaseline_toBottomOf="parent"
app:layout_constraintTop_toBottomOf="#id/FoodToolbar"
tools:layout_editor_absoluteX="-4dp" />
<TextView
android:id="#+id/textView4"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:gravity="center"
android:text="No food reminder added\n + Add now"
android:textAlignment="center"
android:textSize="18dp"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="#+id/recyclerView_food"
app:layout_constraintStart_toStartOf="#+id/recyclerView_food"
app:layout_constraintTop_toBottomOf="#+id/FoodToolbar"
app:layout_constraintVertical_bias="0.523"
android:visibility="gone"
/>
<ImageView
android:layout_width="379dp"
android:layout_height="46dp"
android:src="#drawable/food_icon"
app:layout_constraintBottom_toTopOf="#+id/textView4"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="#+id/FoodToolbar"
app:layout_constraintVertical_bias="0.966"
android:visibility="gone"
/>
<com.google.android.material.floatingactionbutton.FloatingActionButton
android:id="#+id/create_reminder"
android:layout_width="65dp"
android:layout_height="56dp"
android:src="#drawable/ic_baseline_add_24"
app:backgroundTint="#color/yellow_light"
app:layout_anchorGravity="right|bottom"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="0.928"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintVertical_bias="0.961" />
</androidx.constraintlayout.widget.ConstraintLayout>

You can not use applicationcontext in here, but if you want you need to add flags to the intent. So easier method for you to use "this" instead:
mCreateRem.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
Intent intent = new Intent(this, FoodAddReminder.class);
startActivity(intent);
//Starts the new activity to add Reminders
}
});

We can only "guess" why, but "not working" and "app keeps stopping" could mean a lot of things and you didn't provide any Log information or an Exception stacktrace. Its also hard to guess what FoodAddReminder.class is, if its an activity, make sure its declared in your AndroidManifest.xml
mCreateRem.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
Intent intent = new Intent(this, FoodAddReminder.class); // <-- is this an activity?
startActivity(intent);
//Starts the new activity to add Reminders
}
});
Check your AndroidManifest.xml
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.me.my.project">
<application >
<activity
android:name=".FoodAddReminder"/> <!-- here -->
</application>
</manifest>
If that is not the issue, I suspect that using getApplicationContext(), you're having this crash log
AndroidRuntimeException: Calling startActivity() from outside of an Activity context requires the FLAG_ACTIVITY_NEW_TASK flag. Is this
really what you want?
You should then tell the system you want to start a new task,
public void onClick(View v) {
Intent intent = new Intent(getApplicationContext(), FoodAddReminder.class);
intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
startActivity(intent);
}
But I would suggest not doing it, instead use your FoodActivity as your calling activity to FoodReminder in this case, and pay attention to this, it should be prefixed with FoodActivity otherwise it will refer to its enclosing anonymous OnClickListener instance.
#Override
public void onClick(View v) {
Intent intent = new Intent(FoodActivity.this, FoodAddReminder.class);
startActivity(intent);
}
If none of these solved your "not working" issue, please provide a more specific Log information and reduce your code to something that is copy-and-paste-able.

Trigger an event from a button in a widget

I'm trying add a listener to a ImageButton that is on a widget but i can't.
My widget xml is:
<RelativeLayout 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"
android:background="#09C"
android:padding="#dimen/widget_margin"
>
<ImageButton
android:id="#+id/activityCheck"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_margin="8dp"
android:background="#09C"
android:layout_centerHorizontal="true"
android:layout_centerVertical="true"
android:text="Hecho"/>
</RelativeLayout>
The method that i need execute when the imageButton "activityCheck" is pressed is the next:
public void changeColor(View view) {
Log.d("changeColor", "PASE POR AQUÍ");
ImageButton button = view.findViewById(R.id.activityCheck);
button.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
_changeColor(v);
}
});
}
How can I do it?

in layout add
android:clickable="true"
in ImageButton tag.
this will made your image clickable and then it will detect any click events.

why my other view doesn't move up when the snackbar show after using coordinator layout?

so here is my xml file
<?xml version="1.0" encoding="utf-8"?>
<android.support.design.widget.CoordinatorLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:id="#+id/myCoordinatorLayout"
android:layout_width="match_parent"
android:layout_height="match_parent">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent">
<Button
android:id="#+id/button"
android:layout_width="168dp"
android:layout_height="wrap_content"
android:layout_gravity="bottom|end"
android:text="Button"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent" />
</LinearLayout>
</android.support.design.widget.CoordinatorLayout>
and here is my java file:
public class MainActivity extends AppCompatActivity {
Button myButton;
Snackbar mySnackbar;
CoordinatorLayout myCoordinatorLayout;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
myButton = (Button) findViewById(R.id.button);
myCoordinatorLayout = (CoordinatorLayout) findViewById(R.id.myCoordinatorLayout);
myButton.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
mySnackbar = Snackbar.make(myCoordinatorLayout,"Test Snakcbar",BaseTransientBottomBar.LENGTH_INDEFINITE);
mySnackbar.setDuration(8000);
mySnackbar.setAction("OK", new View.OnClickListener() {
#Override
public void onClick(View v) {
mySnackbar.dismiss();
}
});
mySnackbar.show();
}
});
}
}
but my button still stick in the bottom and doesn't move up when the snackbar show. I want my button move up like in this video:
https://developer.android.com/images/training/snackbar/snackbar_button_move.mp4
what should I do ?

You don't need the LinearLayout. Also, you don't need to put constraints, since its coordinator layout and not ConstraintLayout.
Try this instead:
<?xml version="1.0" encoding="utf-8"?>
<android.support.design.widget.CoordinatorLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:id="#+id/myCoordinatorLayout"
android:layout_width="match_parent"
android:layout_height="match_parent">
<Button
android:id="#+id/button"
android:layout_width="168dp"
android:layout_height="wrap_content"
android:layout_gravity="bottom|end"
android:text="Button" />
</android.support.design.widget.CoordinatorLayout>

Setting OnClickListener to an ImageButton

I have tried to set an OnClickListener to my imageButton but it didn't work. I've seen other questions about the topic but none of the ansqers work for me. Am I doing something wrong?
MainActivity.java
public void Button()
{
View.OnClickListener listSet = new View.OnClickListener()
{
#Override
public void onClick(View view)
{
Toast.makeText(getApplicationContext(), "settings", Toast.LENGTH_LONG).show();
}
};
boton= (ImageButton) findViewById(R.id.imageButton7);
boton.setOnClickListener(listSet);
}
Activity_main.xml
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout 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="com.xxxx.xxx.MainActivity"
android:orientation="vertical"
android:weightSum="1"
android:theme="#android:style/Theme.NoTitleBar.Fullscreen"
>
<WebView
android:id="#+id/webV"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true"
android:layout_alignParentTop="true">
</WebView>
<ImageButton
android:id="#+id/imageButton7"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true"
android:layout_alignParentTop="true"
android:background="#android:color/background_light"
android:src="#drawable/ic_gear"
tools:background="#android:color/background_light"
tools:ignore="ContentDescription" />
</RelativeLayout>

Set clickable property of ImageButton to true
<ImageButton
android:id="#+id/imageButton7"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true"
android:layout_alignParentTop="true"
android:clickable="true"
android:background="#android:color/background_light"
android:src="#drawable/ic_gear"
tools:background="#android:color/background_light"
tools:ignore="ContentDescription" />

Try this :
ImageButton ib = (ImageButton) ad.findViewById(R.id.imageButton7);
ib.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
Toast.makeText(getApplicationContext(), "settings", Toast.LENGTH_SHORT).show();
}
});

try:
boton= (ImageButton) findViewById(R.id.imageButton7);
boton.setOnClickListener(new View.OnClickListener()
{
#Override
public void onClick(View view)
{
Toast.makeText(this, "settings", Toast.LENGTH_LONG).show();
}
};);

Android - Click Button Inside alertDialog

I wonder how to click a Button inside of AlertDialog in Android and this is my code
activity_float_info.xml
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="New Button"
android:id="#+id/button" />
MainActivity.java
QR_ = LayoutInflater.from(MainActivity.this).inflate(R.layout.activity_float_info, null);
MAIN_QR_SCAN = (LinearLayout) findViewById(R.id.MAIN_QR_SCAN);
MAIN_QR_SCAN.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
new AlertDialog.Builder(MainActivity.this)
.setCancelable(Boolean.TRUE)
.setNegativeButton(getString(R.string.CANCEL), new DialogInterface.OnClickListener() {
#Override
public void onClick(DialogInterface dialogInterface, int i) {
dialogInterface.dismiss();
}
})
.setView(R.layout.activity_float_info)
.show();
button = (Button)QR_.findViewById(R.id.button);
button.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
button.setText("TEst");
}
});
}
});
I have inflate the layout..
I think the main problem is on
button = (Button)QR_.findViewById(R.id.button);

try this create a layout for dialog box
<TextView android:id="#+id/dialogtitle"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:gravity="center"
android:textColor="#android:color/black"
android:text="Please enter the email address you used for the account"
/>
<EditText
android:id="#+id/emailedittext"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_margin="10dp"
android:ems="10"
android:padding="5dp"
android:cursorVisible="true"
android:singleLine="true"
android:background="#android:color/white"
android:textColor="#android:color/black"
android:hint="Enter Mail id"
android:textSize="20dp" >
<requestFocus />
</EditText>
<LinearLayout android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:weightSum="2"
android:orientation="horizontal">
<Button
android:id="#+id/cancelbtn"
android:layout_width="0dp"
android:layout_weight="1"
android:layout_height="wrap_content"
android:text="CANCEL"/>
<Button
android:id="#+id/okbtn"
android:layout_width="0dp"
android:layout_weight="1"
android:layout_height="wrap_content"
android:text="Ok"/>
</LinearLayout>
Then create a dialog box using this layout and handle button clicks
final Dialog dialog = new Dialog(MainActivity.this);
// Include dialog.xml file
dialog.setContentView(R.layout.forgotpassword);
// Set dialog title
dialog.setTitle("ALERT!!");
// set values for custom dialog components - text, image and button
Button okbtn = (Button) dialog.findViewById(R.id.okbtn);
Button cancelbtn = (Button) dialog.findViewById(R.id.cancelbtn);
final EditText emailedittext = (EditText) dialog.findViewById(R.id.emailedittext);
dialog.show();
dialog.getWindow().setSoftInputMode(
WindowManager.LayoutParams.SOFT_INPUT_STATE_ALWAYS_VISIBLE);
// if decline button is clicked, close the custom dialog
cancelbtn.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
// Close dialog
dialog.dismiss();
}
});
okbtn.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
String email=emailedittext.getText().toString();
//do something more here
}
});
Refer: https://coderzpassion.com/android-show-alertdialog/

Here is a hack to use AlertDialog:
public class CustomDialog extends AlertDialog {
protected CustomDialog(Context context) {
super(context);
}
}
And then in your Activity:
CustomDialog dialog = new CustomDialog(this);
View view = getLayoutInflater().inflate(R.layout.custom_dialog_layout,null);
dialog.setView(view);
Button button = (Button)view.findViewById(R.id.custom_button);
button.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
Toast.makeText(YourActivity.this,"Your message", Toast.LENGTH_LONG).show();
}
});
dialog.show();
And the layout of the dialog (which has nothing in it barring the Button):
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent">
<Button
android:id="#+id/custom_button"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerInParent="true"
android:text="New Button" />
</RelativeLayout>
And you should be able to see a Toast when you click on the button. Hope this helps.

Dialog is like a popup window to show some options to users(options like accept/decline).
Using class android.app.Dialog to create dialog.
Using dialog.xml file to create custom dialog layout.
Example:
res/layout/dialog.xml
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent" >
<ImageView
android:id="#+id/imageDialog"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginRight="6dp" />
<TextView
android:id="#+id/textDialog"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:textColor="#FFF"
android:layout_toRightOf="#+id/imageDialog"/>
<Button
android:id="#+id/declineButton"
android:layout_width="100px"
android:layout_height="wrap_content"
android:text=" Submit "
android:layout_marginTop="5dp"
android:layout_marginRight="5dp"
android:layout_below="#+id/textDialog"
android:layout_toRightOf="#+id/imageDialog"
/>
</RelativeLayout>
Java Code
// Create custom dialog object
final Dialog dialog = new Dialog(CustomDialog.this);
// Include dialog.xml file
dialog.setContentView(R.layout.dialog);
// Set dialog title
dialog.setTitle("Custom Dialog");
// set values for custom dialog components - text, image and button
TextView text = (TextView) dialog.findViewById(R.id.textDialog);
text.setText("Custom dialog Android example.");
ImageView image = (ImageView) dialog.findViewById(R.id.imageDialog);
image.setImageResource(R.drawable.image0);
dialog.show();
Button declineButton = (Button) dialog.findViewById(R.id.declineButton);
// if decline button is clicked, close the custom dialog
declineButton.setOnClickListener(new OnClickListener() {
#Override
public void onClick(View v) {
// Close dialog
dialog.dismiss();
}
});