how can I use same XML layout for different activities?

Question

I am new to android development.I want to use same layout file for two different activities.here is my code

public class MainActivity extends AppCompatActivity {
ToggleButton toggleButton;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    toggleButton=findViewById(R.id.toggle_button);
  
    toggleButton.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
        public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
            if (isChecked) {

               on();
            } 
        }
    });
}
public void on()
{

    Toast.makeText(this, "button on", Toast.LENGTH_SHORT).show();
} 
}

second activity

public class MainActivity2 extends AppCompatActivity {
ToggleButton toggleButton;
TextView textView;
@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    textView=findViewById(R.id.text_view);
toggleButton=findViewById(R.id.toggle_button);
    toggleButton.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
        public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
            if (isChecked) {

                textView.setText("hello MainActivity2");
            } 
        }
    });
}
}

My layout 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=".MainActivity">
<TextView
    android:id="@+id/text_view"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginTop="100dp"
    app:layout_constraintEnd_toEndOf="parent"
    app:layout_constraintStart_toStartOf="parent"
    app:layout_constraintTop_toTopOf="parent"
    tools:ignore="MissingConstraints" />
<ToggleButton
    android:id="@+id/toggle_button"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    app:layout_constraintBottom_toBottomOf="parent"
    app:layout_constraintEnd_toEndOf="parent"
    app:layout_constraintStart_toStartOf="parent"
    app:layout_constraintTop_toTopOf="parent"
    tools:ignore="MissingConstraints" />
</androidx.constraintlayout.widget.ConstraintLayout>

here no text is coming on if i checked the button only toast is coming. I am searching for an answer to this. I dont know how to use this. any type of help will be useful.

Probably a nullpointer exception . in `MainActivity2` your `toggleButton` is null because u never initialized it . — ADM, Apr 12 '22 at 05:03
set some background to your `TextView` and inspect is it even visible at all (placed on screen) or only text is invisible — snachmsm, Apr 12 '22 at 06:57
@snachmsm yes I put text from xml there with some background..it is visible — Akshay, Apr 12 '22 at 07:00
try to call `textView.invalidate()` or `textView.requestLayout()` after setting text — snachmsm, Apr 12 '22 at 07:18

Sambhav Khandelwal · Answer 1 · 2022-04-12T09:41:08.067

0

The issue

You are providing the constraints for the views which overlap each other. This way, they do not get visible. You must change your layout or constraint the views in different way. I will give solution for changing the layout.

The solution

Try this code in your 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="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<TextView
    android:id="@+id/text_view"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginTop="100dp" />
<ToggleButton
    android:id="@+id/toggle_button"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"/>
</LinearLayout >

edited Apr 12 '22 at 09:41

answered Apr 12 '22 at 05:59

Sambhav Khandelwal

3,585
2
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38

Tried this code in XML...nothing changes same result – Akshay Apr 12 '22 at 06:12
It happens in both the activities or only one? – Sambhav Khandelwal Apr 12 '22 at 09:38
see I am printing text in one activity and toast in other activity. here I am getting only Toast and text is not printing. If I use only one activity for this ...it will done but I want to do it using two activities for one xml layout – Akshay Apr 12 '22 at 09:50
is the `onCheckedChanged` being called? Try to add a log there and see if the app reaches there. Or best, just debug it – Sambhav Khandelwal Apr 12 '22 at 09:52

score 0 · Answer 2 · answered Apr 12 '22 at 09:44

0

Another issue might be occurring. Let me explain it here.

You are only setting the text when the button is checked. Not when it is not checked. Try to. display different text every time it's checked or not. Try this code in second activity:

public class MainActivity2 extends AppCompatActivity {
ToggleButton toggleButton;
TextView textView;
@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    textView=findViewById(R.id.text_view);
toggleButton=findViewById(R.id.toggle_button);
    toggleButton.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
        public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
            if (isChecked) {

                textView.setText("hello MainActivity2");
            } else {
                textView.setText("bye MainActivity2");
            }
        }
    });
}
}

answered Apr 12 '22 at 09:44

Sambhav Khandelwal

3,585
2
7
38

tried..no change – Akshay Apr 12 '22 at 09:54
Refer to [this](https://stackoverflow.com/a/16595147/17133283) link – Sambhav Khandelwal Apr 12 '22 at 10:00
at starting i tried using that link only..did not got what i want...well thanks for your time – Akshay Apr 12 '22 at 10:06
`did not got what i want..` what does not work as expected – Sambhav Khandelwal Apr 12 '22 at 10:07
I am doing the same way as it in the link given by you – Akshay Apr 12 '22 at 10:10
so what is not working? Same issue? – Sambhav Khandelwal Apr 12 '22 at 10:11
Let us [continue this discussion in chat](https://chat.stackoverflow.com/rooms/243817/discussion-between-akshay-and-sambhav-k). – Akshay Apr 12 '22 at 10:12

how can I use same XML layout for different activities?

2 Answers2

The issue

The solution