How to EditText Tutorial in Android App Working With TextView | Android Studio Tutorials

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EditText Tutorial android studio

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"
    android:padding="10dp"
    tools:context=".MainActivity">

    <EditText
        android:id="@+id/f_name_et"
        android:hint="Enter First Name"
        android:inputType="text"
        android:layout_width="match_parent"
        android:layout_height="wrap_content" />
    <EditText
        android:id="@+id/l_name_et"
        android:hint="Enter Last Name"
        android:inputType="text"
        android:layout_width="match_parent"
        android:layout_height="wrap_content" />
    <Button
        android:id="@+id/save_btn"
        android:text="Save"
        android:layout_gravity="center"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content" />
    <TextView
        android:id="@+id/f_name_tv"
        android:text="First Name:"
        android:textSize="30sp"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content" />
    <TextView
        android:id="@+id/l_name_tv"
        android:text="Last Name:"
        android:textSize="30sp"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content" />

</LinearLayout>

MainActivity.java

package com.usmtip.myapplication;

import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
import android.widget.Toast;

import androidx.appcompat.app.AppCompatActivity;




public class MainActivity extends AppCompatActivity {


    EditText mFirstNameEt, mLastNameEt;
    Button mSaveBtn;
    TextView mFirstNameTv, mLastNameTv;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);





        mFirstNameEt = findViewById(R.id.f_name_et);
        mLastNameEt  = findViewById(R.id.l_name_et);
        mFirstNameTv = findViewById(R.id.f_name_tv);
        mLastNameTv  = findViewById(R.id.l_name_tv);
        mSaveBtn     = findViewById(R.id.save_btn);

        mSaveBtn.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                //get text from edit text
                String mFName = mFirstNameEt.getText().toString().trim();
                String mLName = mLastNameEt.getText().toString().trim();

                //validate Edit Text
                if (mFName.isEmpty()){
                    Toast.makeText(MainActivity.this, "Enter first name", Toast.LENGTH_SHORT).show();
                }
                else if (mLName.isEmpty()){
                    Toast.makeText(MainActivity.this, "Enter last name", Toast.LENGTH_SHORT).show();
                }
                else {
                    mFirstNameTv.setText("First Name: "+mFName);
                    mLastNameTv.setText("Last Name: "+mLName);
                }
            }
        });

    }
}