How to switch between hide and view password in Android

There are so many cases, it required to show password while entering password or after entered password. This example demonstrate about How to switch between hide and view password.
Step 1 − Create a new project in Android Studio, go to File ⇒ New Project and fill all required details to create a new project.
Step 2 − Add the following code to res/layout/activity_main.xml.
<?xml version = "1.0" encoding = "utf-8"?>
<LinearLayout 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"
   tools:context = ".MainActivity"
   android:background = "#dde4dd"
   android:orientation = "vertical">
   <android.support.design.widget.TextInputLayout
      android:layout_width = "match_parent"
      android:layout_height = "wrap_content"
      android:id = "@+id/layoutEmail"
      android:layout_marginTop = "8dp"
      android:layout_marginStart = "8dp"
      android:layout_marginEnd = "8dp"
      style = "@style/Widget.MaterialComponents.TextInputLayout.FilledBox">
      <android.support.design.widget.TextInputEditText
         android:layout_width = "match_parent"
         android:layout_height = "wrap_content"
         android:id = "@+id/email"
         android:hint = "Enter Email id"
         android:inputType = "textEmailAddress"/>
   </android.support.design.widget.TextInputLayout>
   <android.support.design.widget.TextInputLayout
      android:layout_width = "match_parent"
      android:layout_height = "wrap_content"
      android:id = "@+id/layoutPassword"
      android:layout_marginTop = "8dp"
      android:layout_marginStart = "8dp"
      android:layout_marginEnd = "8dp"
      style = "@style/Widget.MaterialComponents.TextInputLayout.FilledBox">
      <android.support.design.widget.TextInputEditText
         android:layout_width = "match_parent"
         android:layout_height = "wrap_content"
         android:id = "@+id/password"
         android:hint = "Password"
         android:inputType = "textPassword"/>
   </android.support.design.widget.TextInputLayout>
   <LinearLayout
      android:layout_width = "match_parent"
      android:gravity = "center"
      android:layout_height = "wrap_content">
      <Button
         android:id = "@+id/passwordVisible"
         android:layout_width = "wrap_content"
         android:layout_height = "wrap_content"
         android:text = "Show"></Button>
      <Button
         android:id = "@+id/click"
         android:layout_width = "wrap_content"
         android:layout_height = "wrap_content"
         android:text = "Click"></Button>
   </LinearLayout>
</LinearLayout>
In the above code we have given two TextInputEditText and one button. if you click on click button it will take data from edit text and show on Toast. Or if you click on show button, it will show and hide password as per requirement.
Step 3 − Add the following code to src/MainActivity.java
package com.example.andy.myapplication;

import android.graphics.Point;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.text.method.PasswordTransformationMethod;
import android.view.TextureView;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
import android.widget.Toast;

public class MainActivity extends AppCompatActivity {
   Button PasswordVisble;
   EditText email,password;
   @Override
   protected void onCreate(Bundle savedInstanceState) {
      super.onCreate(savedInstanceState);
      setContentView(R.layout.activity_main);
      email = findViewById(R.id.email);
      password = findViewById(R.id.password);
      PasswordVisble = findViewById(R.id.passwordVisible);
      PasswordVisble.setOnClickListener(new View.OnClickListener() {
         @Override
         public void onClick(View v) {
            if(password.getText().toString().isEmpty()){
               password.setError("Please Enter Pass word");
            } else {
               if(PasswordVisble.getText().toString().equals("Show")){
               PasswordVisble.setText("Hide");
               password.setTransformationMethod(null);
               } else {
                  PasswordVisble.setText("Show");
                  password.setTransformationMethod(new PasswordTransformationMethod());
               }
            }
         }
      });
      Button click = findViewById(R.id.click);
      click.setOnClickListener(new View.OnClickListener() {
         @Override
         public void onClick(View v) {
            if(!email.getText().toString().isEmpty()&&(!password.getText().toString().isEmpty())) {
            Toast.makeText(MainActivity.this, "you have entered email id " + email.getText().toString() + "Password " + password.getText().toString(), Toast.LENGTH_LONG).show();
            } else {
               email.setError("Please Enter Email id");
               password.setError("Please Enter Pass word");
            }
         }
      });
   }
}
To show and hide password we are using Password transformation method as shown below -
if(PasswordVisble.getText().toString().equals("Show")) {
   PasswordVisble.setText("Hide");
   password.setTransformationMethod(null);
} else {
   PasswordVisble.setText("Show");
   password.setTransformationMethod(new PasswordTransformationMethod());
}
In the above defines as
Show password: password.setTransformationMethod(null);

Hide password: password.setTransformationMethod(new PasswordTransformationMethod());
Step 4 − Open build.gradle and add design support library dependency.
apply plugin: 'com.android.application'

android {
   compileSdkVersion 28
   defaultConfig {
      applicationId "com.example.andy.myapplication"
      minSdkVersion 15
      targetSdkVersion 28
      compileSdkVersion 28
      versionCode 1
      versionName "1.0"
   testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
   }
   buildTypes {
      release {
         minifyEnabled false
         proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
      }
   }
}
dependencies {
   implementation fileTree(dir: 'libs', include: ['*.jar'])
   implementation 'com.android.support:appcompat-v7:28.0.0'
   implementation 'com.android.support:design:28.0.0'
   implementation 'com.android.support.constraint:constraint-layout:1.1.3'
   testImplementation 'junit:junit:4.12'
   androidTestImplementation 'com.android.support.test:runner:1.0.2'
   androidTestImplementation 'com.android.support.test.espresso:espresso-core:3.0.2'
}
Let's try to run your application. I assume you have connected your actual Android Mobile device with your computer. To run the app from android studio, open one of your project's activity files and click Run  icon from the toolbar. Select your mobile device as an option and then check your mobile device which will display your default screen −
It is a initial screen and click on show button with enter input in password. it will show error as shown above.
Now enter some data in password edit text and clicked on show button it will show output as shown below-
Click here to download the project code