This post continues from https://varanasisoftwarejunction.blogspot.com/2021/01/colors-in-android-studio.html.
Open the fragment_first.xml in Android Studio.
<?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=".FirstFragment"
android:background="@drawable/layoutbackground"
>
<TextView
android:background="@color/textbgcolor"
android:id="@+id/textview_first"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/hello_first_fragment"
app:layout_constraintBottom_toTopOf="@id/button_first"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent" />
<Button
android:id="@+id/button_first"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/next"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="@id/textview_first" />
</androidx.constraintlayout.widget.ConstraintLayout>
Click the design button
And change its parameters in the properties view.
<TextView
android:id="@+id/textview_first"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:background="@color/textbgcolor"
android:text="@string/hello_first_fragment"
app:layout_constraintBottom_toTopOf="@id/button_first"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent" />
Next, place two buttons in the layout and adjust.
This video shows how.
Here is the layout after placement of the buttons
<?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"
android:background="@drawable/layoutbackground"
tools:context=".FirstFragment">
<TextView
android:id="@+id/textview_first"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:background="@color/textbgcolor"
android:text="@string/hello_first_fragment"
app:layout_constraintBottom_toTopOf="@id/button_first"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent" />
<Button
android:id="@+id/button_first"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/next"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="@id/textview_first" />
<Button
android:id="@+id/button"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginStart="72dp"
android:text="Left"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintVertical_bias="0.184" />
<Button
android:id="@+id/button2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Right"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="0.49"
app:layout_constraintStart_toEndOf="@+id/button"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintVertical_bias="0.184" />
</androidx.constraintlayout.widget.ConstraintLayout>
The layout as it appears in Android Studio
Here is the code of first_fragment.xml
<?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"
android:background="@drawable/layoutbackground"
tools:context=".FirstFragment">
<TextView
android:id="@+id/textview_first"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:background="@color/textbgcolor"
android:text="@string/hello_first_fragment"
app:layout_constraintBottom_toTopOf="@id/button_first"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent" />
<Button
android:id="@+id/button_first"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/next"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="@id/textview_first" />
<Button
android:id="@+id/button"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginStart="72dp"
android:text="Left"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintVertical_bias="0.184" />
<Button
android:id="@+id/button2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Right"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="0.49"
app:layout_constraintStart_toEndOf="@+id/button"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintVertical_bias="0.184" />
</androidx.constraintlayout.widget.ConstraintLayout>
Now add a click listener in FirstFragment.kt
package com.varanasisoftwarejunction.mykotlinproject
import android.os.Bundle
import androidx.fragment.app.Fragment
import android.view.LayoutInflater
import android.view.View
import android.widget.TextView
import android.view.ViewGroup
import android.widget.Button
import androidx.navigation.fragment.findNavController
/**
* A simple [Fragment] subclass as the default destination in the navigation.
*/
class FirstFragment : Fragment() {
override fun onCreateView(
inflater: LayoutInflater, container: ViewGroup?,
savedInstanceState: Bundle?
): View? {
// Inflate the layout for this fragment
return inflater.inflate(R.layout.fragment_first, container, false)
}
public fun f1(view:View)
{
val tv:TextView = view.findViewById<TextView>(R.id.textview_first)
tv.text="I was clicked"
}
override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
super.onViewCreated(view, savedInstanceState)
view.findViewById<Button>(R.id.button).setOnClickListener {
f1(view)
}
view.findViewById<Button>(R.id.button_first).setOnClickListener {
findNavController().navigate(R.id.action_FirstFragment_to_SecondFragment)
}
}
}
Here is the output in n Android Phone.
Repository for this commit
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