Password Strength Checker Android

Check password strength (Weak, Medium, Strong, Very Strong). Setting optional requirements by required length, with at least 1 special character, numbers and letters in uppercase or lowercase.

How to use

Step 1. Add the JitPack repository to your build file. Add it in your root build.gradle at the end of repositories:

allprojects {
  repositories {
    ...
    maven { url "https://jitpack.io" }
  }
}

Step 2. Add the dependency

dependencies {
    compile 'com.github.yesterselga:password-strength-checker-android:v1.0'
}

Usage

in your MainActivity.java

import com.ybs.passwordstrengthchecker.PwdStrength.PasswordStrength;

public class MainActivity extends AppCompatActivity implements TextWatcher {

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

        EditText password = (EditText)findViewById(R.id.login_password);
        password.addTextChangedListener(this);

    }

    @Override
    public void afterTextChanged(Editable s) {
    }
    @Override
    public void beforeTextChanged(
            CharSequence s, int start, int count, int after) {
    }

    @Override
    public void onTextChanged(CharSequence s, int start, int before, int count) {
        updatePasswordStrengthView(s.toString());
    }

    private void updatePasswordStrengthView(String password) {

        ProgressBar progressBar = (ProgressBar) findViewById(R.id.progressBar);
        TextView strengthView = (TextView) findViewById(R.id.password_strength);
        if (TextView.VISIBLE != strengthView.getVisibility())
            return;

        if (password.isEmpty()) {
            strengthView.setText("");
            progressBar.setProgress(0);
            return;
        }

        PasswordStrength str = PasswordStrength.calculateStrength(password);
        strengthView.setText(str.getText(this));
        strengthView.setTextColor(str.getColor());

        progressBar.getProgressDrawable().setColorFilter(str.getColor(), android.graphics.PorterDuff.Mode.SRC_IN);
        if (str.getText(this).equals("Weak")) {
            progressBar.setProgress(25);
        } else if (str.getText(this).equals("Medium")) {
            progressBar.setProgress(50);
        } else if (str.getText(this).equals("Strong")) {
            progressBar.setProgress(75);
        } else {
            progressBar.setProgress(100);
        }
    }
}

in your activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:padding="20sp">
    <TextView
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:text="Password Meter"
        android:gravity="center_horizontal"
        android:paddingTop="25sp"
        android:paddingBottom="20sp"
        android:textSize="20sp" />
    <EditText
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:freezesText="true"
        android:hint="Enter Password"
        android:clickable="true"
        android:singleLine="true"
        android:inputType="textPassword"
        android:id="@+id/login_password"
        android:padding="10dp"
        android:background="@null"/>
    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="horizontal">
        <ProgressBar
            android:id="@+id/progressBar"
            style="?android:attr/progressBarStyleHorizontal"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:indeterminate="false"
            android:maxHeight="20dip"
            android:minHeight="20dip"
            android:layout_weight="1"
            android:progress="0"/>
        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:gravity="center_horizontal"
            android:text="Weak"
            android:id="@+id/password_strength" />
    </LinearLayout>
    <TextView
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:id="@+id/login_instructions"
        android:text="Your password must be at least 8 characters. With at least 1 number and 1 special character" />
</LinearLayout>

in your values/strings.xml

<resources>
    <string name="password_strength_weak">Weak</string>
    <string name="password_strength_medium">Medium</string>
    <string name="password_strength_strong">Strong</string>
    <string name="password_strength_very_strong">Very Strong</string>
</resources>

Done ;)