Question

Android Studio (Java)

Develop an android app that contains two fragments displayed on one activity.

The bottom fragment contains / displays several rows of individual buttons and each of these buttons resemble a letter of the alphabet such as the first button "A" second button "B" etc.. all the way to Z as well as buttons for the numbers 0 - 9.

Once a user clicks a button, the corresponding letter or number button they pressed should display in the top fragment.

For example: If a user presses Button "H" then presses button "E" then "L" then "L" and then "O" in the bottom fragment, then the text "HELLO" should be displayed in the top fragment. In other words the app works like a notepad

Please provide screenshots of the output OF THE WORKING APP and please include the FULL CODE OF EVERY FILE / MODIFIED FILES used in the creation of this application for example.

MainActivity.java

// code here

activity_main.xml

// code here

If you have any questions please be specific.

Thanks

Answer 1

Here is the answer..

CODE:

activity_main.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" tools:context=".MainActivity"> <TextView android:layout_width="match_parent" android:layout_height="100dp" android:textSize="20dp" android:hint="enter" android:id="@+id/text_view" /> <LinearLayout android:layout_width="match_parent" android:layout_height="wrap_content" android:orientation="horizontal"> <Button android:layout_width="0dp" android:layout_height="wrap_content" android:onClick="submit" android:layout_weight="0.1" android:id="@+id/one" android:text="1"/> <Button android:layout_width="0dp" android:layout_height="wrap_content" android:layout_weight="0.1" android:onClick="submit" android:id="@+id/two" android:text="2" /> <Button android:layout_width="0dp" android:layout_height="wrap_content" android:layout_weight="0.1" android:onClick="submit" android:id="@+id/three" android:text="3" /> <Button android:layout_width="0dp" android:layout_height="wrap_content" android:layout_weight="0.1" android:onClick="submit" android:id="@+id/four" android:text="4" /> <Button android:layout_width="0dp" android:layout_height="wrap_content" android:layout_weight="0.1" android:onClick="submit" android:text="5" android:id="@+id/five"/> <Button android:layout_width="0dp" android:layout_height="wrap_content" android:layout_weight="0.1" android:onClick="submit" android:id="@+id/six" android:text="6" /> <Button android:layout_width="0dp" android:layout_height="wrap_content" android:layout_weight="0.1" android:onClick="submit" android:id="@+id/seven" android:text="7" /> <Button android:layout_width="0dp" android:layout_height="wrap_content" android:layout_weight="0.1" android:onClick="submit" android:id="@+id/eight" android:text="8" /> <Button android:layout_width="0dp" android:layout_height="wrap_content" android:layout_weight="0.1" android:onClick="submit" android:id="@+id/nine" android:text="9" /> <Button android:layout_width="0dp" android:layout_height="wrap_content" android:layout_weight="0.1" android:onClick="submit" android:id="@+id/zero" android:text="0" /> </LinearLayout> <LinearLayout android:layout_width="match_parent" android:layout_height="wrap_content" android:orientation="horizontal"> <Button android:layout_width="0dp" android:layout_height="wrap_content" android:layout_weight="0.1" android:onClick="submit" android:id="@+id/q" android:text="q" /> <Button android:layout_width="0dp" android:layout_height="wrap_content" android:layout_weight="0.1" android:onClick="submit" android:text="w" android:id="@+id/w"/> <Button android:layout_width="0dp" android:layout_height="wrap_content" android:layout_weight="0.1" android:onClick="submit" android:text="e" android:id="@+id/e"/> <Button android:layout_width="0dp" android:layout_height="wrap_content" android:layout_weight="0.1" android:onClick="submit" android:text="r" android:id="@+id/r"/> <Button android:layout_width="0dp" android:layout_height="wrap_content" android:layout_weight="0.1" android:onClick="submit" android:text="t" android:id="@+id/t"/> <Button android:layout_width="0dp" android:layout_height="wrap_content" android:layout_weight="0.1" android:onClick="submit" android:text="y" android:id="@+id/y"/> <Button android:id="@+id/u" android:layout_width="0dp" android:layout_height="wrap_content" android:layout_weight="0.1" android:onClick="submit" android:text="u" /> <Button android:id="@+id/i" android:layout_width="0dp" android:layout_height="wrap_content" android:layout_weight="0.1" android:onClick="submit" android:text="i" /> <Button android:id="@+id/o" android:layout_width="0dp" android:layout_height="wrap_content" android:layout_weight="0.1" android:onClick="submit" android:text="o" /> <Button android:id="@+id/p" android:layout_width="0dp" android:layout_height="wrap_content" android:layout_weight="0.1" android:onClick="submit" android:text="p" /> </LinearLayout> <LinearLayout android:layout_width="match_parent" android:layout_height="wrap_content" android:orientation="horizontal"> <Button android:id="@+id/a" android:layout_width="0dp" android:layout_height="wrap_content" android:layout_weight="0.1" android:onClick="submit" android:text="a" /> <Button android:id="@+id/s" android:layout_width="0dp" android:layout_height="wrap_content" android:layout_weight="0.1" android:onClick="submit" android:text="s" /> <Button android:id="@+id/d" android:layout_width="0dp" android:layout_height="wrap_content" android:layout_weight="0.1" android:onClick="submit" android:text="d" /> <Button android:id="@+id/f" android:layout_width="0dp" android:layout_height="wrap_content" android:layout_weight="0.1" android:onClick="submit" android:text="f" /> <Button android:id="@+id/g" android:layout_width="0dp" android:layout_height="wrap_content" android:layout_weight="0.1" android:onClick="submit" android:text="g" /> <Button android:id="@+id/h" android:layout_width="0dp" android:layout_height="wrap_content" android:layout_weight="0.1" android:onClick="submit" android:text="h" /> <Button android:id="@+id/j" android:layout_width="0dp" android:layout_height="wrap_content" android:layout_weight="0.1" android:onClick="submit" android:text="j" /> <Button android:id="@+id/k" android:layout_width="0dp" android:layout_height="wrap_content" android:layout_weight="0.1" android:onClick="submit" android:text="k" /> <Button android:id="@+id/l" android:layout_width="0dp" android:layout_height="wrap_content" android:layout_weight="0.1" android:onClick="submit" android:text="l" /> </LinearLayout> <LinearLayout android:layout_width="match_parent" android:layout_height="wrap_content" android:orientation="horizontal"> <Button android:id="@+id/z" android:layout_width="0dp" android:layout_height="wrap_content" android:layout_weight="0.1" android:onClick="submit" android:text="z" /> <Button android:id="@+id/x" android:layout_width="0dp" android:layout_height="wrap_content" android:layout_weight="0.1" android:onClick="submit" android:text="x" /> <Button android:id="@+id/c" android:layout_width="0dp" android:layout_height="wrap_content" android:layout_weight="0.1" android:onClick="submit" android:text="c" /> <Button android:id="@+id/v" android:layout_width="0dp" android:layout_height="wrap_content" android:layout_weight="0.1" android:onClick="submit" android:text="v" /> <Button android:id="@+id/b" android:layout_width="0dp" android:layout_height="wrap_content" android:layout_weight="0.1" android:onClick="submit" android:text="b" /> <Button android:id="@+id/n" android:layout_width="0dp" android:layout_height="wrap_content" android:layout_weight="0.1" android:onClick="submit" android:text="n" /> <Button android:id="@+id/m" android:layout_width="0dp" android:layout_height="wrap_content" android:layout_weight="0.1" android:onClick="submit" android:text="m" /> <Button android:id="@+id/clr" android:layout_width="0dp" android:layout_height="wrap_content" android:layout_weight="0.1" android:onClick="submit" android:text="cl" /> </LinearLayout> </LinearLayout>

MainActivity.java

package com.example.buttons; import androidx.appcompat.app.AppCompatActivity; import android.os.Bundle; import android.view.View; import android.widget.Button; import android.widget.TextView; import android.widget.Toast; public class MainActivity extends AppCompatActivity { TextView textView; String str=""; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); textView=findViewById(R.id.text_view); } public void submit(View view) { //here getting the id of corresponding Button id's Button btn=findViewById(view.getId()); //checking whether it is clr id or not if(R.id.clr == view.getId()) { //clears the string when it is not empty in the textview if(!str.equals("")) { str = str.substring(0, str.length() - 1); textView.setText(str); } } else { //here adding the clicked buttons to the string String st=btn.getText().toString(); // concatinating the clicked button text to the string str = str+st; //setting the text in the textview textView.setText(str); } } }

OUTPUT:

I have added clear button extra

If you have any doubts please COMMENT...

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