Password validation

package com.example.headfirst;

import android.os.Bundle;
import android.support.v7.app.ActionBarActivity;
import android.util.Log;

public class MainActivity extends ActionBarActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
if (validate("pPtdhim4")) {
Log.e("", "validate");
} else {
Log.e("", "not validate");
}
}
public static boolean validate(String password) {
   return password.matches("^(?=.*?[A-Z])(?=.*?[a-z])(?=.*?[0-9]).{8,}$");
}
}

Note: Different expression for different validation

Minimum 8 characters at least 1 Alphabet and 1 Number:

"^(?=.*[A-Za-z])(?=.*\d)[A-Za-z\d]{8,}$"

Minimum 8 characters at least 1 Alphabet, 1 Number and 1 Special Character:

"^(?=.*[A-Za-z])(?=.*\d)(?=.*[$@$!%*#?&])[A-Za-z\d$@$!%*#?&]{8,}$"

Minimum 8 characters at least 1 Uppercase Alphabet, 1 Lowercase Alphabet and 1 Number:

"^(?=.*[a-z])(?=.*[A-Z])(?=.*\d)[a-zA-Z\d]{8,}$"

Minimum 8 characters at least 1 Uppercase Alphabet, 1 Lowercase Alphabet, 1 Number and 1 Special Character:

"^(?=.*[a-z])(?=.*[A-Z])(?=.*\d)(?=.*[$@$!%*?&])[A-Za-z\d$@$!%*?&]{8,}"

Minimum 8 and Maximum 10 characters at least 1 Uppercase Alphabet, 1 Lowercase Alphabet, 1 Number and 1 Special Character:

"^(?=.*[a-z])(?=.*[A-Z])(?=.*\d)(?=.*[$@$!%*?&])[A-Za-z\d$@$!%*?&]{8,10}"




FloatingLable

1)Floating ButtoActivity.java

package com.example.admin.snackbar;

import android.os.Bundle;
import android.support.design.widget.TextInputLayout;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.Toolbar;
import android.text.Editable;
import android.text.TextUtils;
import android.text.TextWatcher;
import android.view.View;
import android.view.WindowManager;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;

/** * Created by ADMIN on 29/03/2016. */public class FloatingLabelActivity extends AppCompatActivity{
    private Toolbar toolbar;
    private EditText inputName, inputEmail, inputPassword;
    private TextInputLayout inputLayoutName, inputLayoutEmail, inputLayoutPassword;
    private Button btnSignUp;

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

        toolbar = (Toolbar) findViewById(R.id.toolbar);
        setSupportActionBar(toolbar);
        inputLayoutName = (TextInputLayout) findViewById(R.id.input_layout_name);
        inputLayoutEmail = (TextInputLayout) findViewById(R.id.input_layout_email);
        inputLayoutPassword = (TextInputLayout) findViewById(R.id.input_layout_password);
        inputName = (EditText) findViewById(R.id.input_name);
        inputEmail = (EditText) findViewById(R.id.input_email);
        inputPassword = (EditText) findViewById(R.id.input_password);
        btnSignUp = (Button) findViewById(R.id.btn_signup);
        inputName.addTextChangedListener(new MyTextWatcher(inputName));
        inputEmail.addTextChangedListener(new MyTextWatcher(inputEmail));
        inputPassword.addTextChangedListener(new MyTextWatcher(inputPassword));
        btnSignUp.setOnClickListener(new View.OnClickListener() {
            @Override            public void onClick(View view) {
                submitForm();
            }
        });
    }

    /**     * Validating form     */    private void submitForm() {
        if (!validateName()) {
            return;
        }
        if (!validateEmail()) {
            return;
        }

        if (!validatePassword()) {
            return;
        }
        Toast.makeText(getApplicationContext(), "Thank You!", Toast.LENGTH_SHORT).show();
    }

    private boolean validateName() {
        if (inputName.getText().toString().trim().isEmpty()) {
            inputLayoutName.setError(getString(R.string.err_msg_name));
            requestFocus(inputName);
            return false;
        } else {
            inputLayoutName.setErrorEnabled(false);
        }
        return true;
    }

    private boolean validateEmail() {
        String email = inputEmail.getText().toString().trim();
        if (email.isEmpty() || !isValidEmail(email)) {
            inputLayoutEmail.setError(getString(R.string.err_msg_email));
            requestFocus(inputEmail);
            return false;
        } else {
            inputLayoutEmail.setErrorEnabled(false);
        }
        return true;
    }

    private boolean validatePassword() {
        if (inputPassword.getText().toString().trim().isEmpty()) {
            inputLayoutPassword.setError(getString(R.string.err_msg_password));
            requestFocus(inputPassword);
            return false;
        } else {
            inputLayoutPassword.setErrorEnabled(false);
        }
        return true;
    }

    private static boolean isValidEmail(String email) {
        return !TextUtils.isEmpty(email) && android.util.Patterns.EMAIL_ADDRESS.matcher(email).matches();
    }

    private void requestFocus(View view) {
        if (view.requestFocus()) {
            getWindow().setSoftInputMode(WindowManager.LayoutParams.SOFT_INPUT_STATE_ALWAYS_VISIBLE);
        }
    }

    private class MyTextWatcher implements TextWatcher {
        private View view;
        private MyTextWatcher(View view) {
            this.view = view;
        }

        public void beforeTextChanged(CharSequence charSequence, int i, int i1, int i2) {
        }

        public void onTextChanged(CharSequence charSequence, int i, int i1, int i2) {
        }

        public void afterTextChanged(Editable editable) {
            switch (view.getId()) {
                case R.id.input_name:
                    validateName();
                    break;
                case R.id.input_email:
                    validateEmail();
                    break;
                case R.id.input_password:
                    validatePassword();
                    break;
            }
        }
    }
}

2)floating_lable.xml

<android.support.design.widget.CoordinatorLayout xmlns:android="http://schemas.android.com/apk/res/android"

    xmlns:app="http://schemas.android.com/apk/res-auto"    android:layout_width="match_parent"    android:layout_height="match_parent">

    <android.support.design.widget.AppBarLayout        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:theme="@style/ThemeOverlay.AppCompat.Dark.ActionBar">

        <android.support.v7.widget.Toolbar            android:id="@+id/toolbar"            android:layout_width="match_parent"            android:layout_height="?attr/actionBarSize"            android:background="?attr/colorPrimary"            app:layout_scrollFlags="scroll|enterAlways"            app:popupTheme="@style/ThemeOverlay.AppCompat.Light">

        </android.support.v7.widget.Toolbar>

    </android.support.design.widget.AppBarLayout>

    <LinearLayout        android:layout_width="fill_parent"        android:layout_height="match_parent"        android:layout_marginTop="?attr/actionBarSize"        android:orientation="vertical"        android:paddingLeft="20dp"        android:paddingRight="20dp"        android:paddingTop="60dp">

        <android.support.design.widget.TextInputLayout            android:id="@+id/input_layout_name"            android:layout_width="match_parent"            android:layout_height="wrap_content">

            <EditText                android:id="@+id/input_name"                android:layout_width="match_parent"                android:layout_height="wrap_content"                android:singleLine="true"                android:hint="@string/hint_name" />
        </android.support.design.widget.TextInputLayout>

        <android.support.design.widget.TextInputLayout            android:id="@+id/input_layout_email"            android:layout_width="match_parent"            android:layout_height="wrap_content">

            <EditText                android:id="@+id/input_email"                android:layout_width="match_parent"                android:layout_height="wrap_content"                android:inputType="textEmailAddress"                android:hint="@string/hint_email" />
        </android.support.design.widget.TextInputLayout>

        <android.support.design.widget.TextInputLayout            android:id="@+id/input_layout_password"            android:layout_width="match_parent"            android:layout_height="wrap_content">

            <EditText                android:id="@+id/input_password"                android:layout_width="match_parent"                android:layout_height="wrap_content"                android:inputType="textPassword"                android:hint="@string/hint_password" />
        </android.support.design.widget.TextInputLayout>

        <Button android:id="@+id/btn_signup"            android:layout_width="fill_parent"            android:layout_height="wrap_content"            android:text="@string/btn_sign_up"            android:background="@color/colorPrimary"            android:layout_marginTop="40dp"            android:textColor="@android:color/white"/>

    </LinearLayout>

</android.support.design.widget.CoordinatorLayout>

3)style.xml

<resources>

<!-- Base application theme. --><style name="AppTheme" parent="Theme.AppCompat.Light.NoActionBar">
    <!-- Customize your theme here. --></style>

<style name="MyMaterialTheme" parent="MyMaterialTheme.Base">
</style>

<style name="MyMaterialTheme.Base" parent="Theme.AppCompat.Light.NoActionBar">
    <item name="colorPrimary">@color/colorPrimary</item>
    <item name="colorPrimaryDark">@color/colorPrimaryDark</item>
    <item name="colorAccent">@color/colorAccent</item>
</style>

</resources>

4)manifest.xml
<?xml version="1.0" encoding="utf-8"?><manifest xmlns:android="http://schemas.android.com/apk/res/android"    package="com.example.admin.snackbar" >

    <application        android:allowBackup="true"        android:icon="@mipmap/ic_launcher"        android:label="@string/app_name"        android:theme="@style/MyMaterialTheme" >
        <activity            android:name=".MainActivity"            android:label="@string/app_name" >

        </activity>
        <activity            android:name=".FloatingLabelActivity"            android:label="@string/app_name" >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />
                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
    </application>
</manifest>

Snackbar

1) Create MainActivity.java

package com.example.admin.snackbar;

import android.graphics.Color;
import android.os.Bundle;
import android.support.design.widget.CoordinatorLayout;
import android.support.design.widget.FloatingActionButton;
import android.support.design.widget.Snackbar;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.Toolbar;
import android.view.Gravity;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;

public class MainActivity extends AppCompatActivity {
    private Toolbar mToolbar;
    private FloatingActionButton fab;
    private Button btnSimpleSnackbar, btnActionCallback, btnCustomView;
    private CoordinatorLayout coordinatorLayout;

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

        coordinatorLayout = (CoordinatorLayout) findViewById(R.id.coordinatorLayout);
        mToolbar = (Toolbar) findViewById(R.id.toolbar);
        setSupportActionBar(mToolbar);
        fab = (FloatingActionButton) findViewById(R.id.fab);
        btnSimpleSnackbar = (Button) findViewById(R.id.btnSimpleSnackbar);
        btnActionCallback = (Button) findViewById(R.id.btnActionCallback);
        btnCustomView = (Button) findViewById(R.id.btnCustomSnackbar);


        btnSimpleSnackbar.setOnClickListener(new View.OnClickListener() {
            @Override            public void onClick(View view) {
                Snackbar snackbar = Snackbar.make(coordinatorLayout, "Welcome to AndroidHive", Snackbar.LENGTH_LONG);
                View view1 = snackbar.getView();
                CoordinatorLayout.LayoutParams params = (CoordinatorLayout.LayoutParams)view.getLayoutParams();
                params.gravity = Gravity.TOP;
                view1.setLayoutParams(params);
                snackbar.show();
            }
        });

        btnActionCallback.setOnClickListener(new View.OnClickListener() {
            @Override            public void onClick(View view) {
                Snackbar snackbar = Snackbar
                        .make(coordinatorLayout, "Message is deleted", Snackbar.LENGTH_LONG)
                        .setAction("UNDO", new View.OnClickListener() {
                            @Override                            public void onClick(View view) {
                                Snackbar snackbar1 = Snackbar.make(coordinatorLayout, "Message is restored!", Snackbar.LENGTH_SHORT);
                                snackbar1.show();
                            }
                        });
                snackbar.show();
            }
        });

        btnCustomView.setOnClickListener(new View.OnClickListener() {
            @Override            public void onClick(View view) {
                Snackbar snackbar = Snackbar
                        .make(coordinatorLayout, "No internet connection!", Snackbar.LENGTH_LONG)
                        .setAction("RETRY", new View.OnClickListener() {
                            @Override                            public void onClick(View view) {

                            }
                        });
                snackbar.setActionTextColor(Color.RED);
                View sbView = snackbar.getView();
                TextView textView = (TextView) sbView.findViewById(android.support.design.R.id.snackbar_text);
                textView.setTextColor(Color.YELLOW);
                snackbar.show();
            }
        });
    }

    @Override    public boolean onCreateOptionsMenu(Menu menu) {
        getMenuInflater().inflate(R.menu.menu_main, menu);
        return true;
    }

    @Override    public boolean onOptionsItemSelected(MenuItem item) {
        int id = item.getItemId();
        if (id == R.id.action_settings) {
            return true;
        }
        return super.onOptionsItemSelected(item);
    }
}

2)crete activity_main

<android.support.design.widget.CoordinatorLayout 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:id="@+id/coordinatorLayout"    android:layout_width="match_parent"    android:layout_height="match_parent"    tools:context=".MainActivity">

    <android.support.design.widget.AppBarLayout        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:theme="@style/ThemeOverlay.AppCompat.Dark.ActionBar">

        <android.support.v7.widget.Toolbar            android:id="@+id/toolbar"            android:layout_width="match_parent"            android:layout_height="?attr/actionBarSize"            android:background="?attr/colorPrimary"            app:layout_scrollFlags="scroll|enterAlways"            app:popupTheme="@style/ThemeOverlay.AppCompat.Light" />
    </android.support.design.widget.AppBarLayout>

    <LinearLayout        android:layout_width="fill_parent"        android:layout_height="wrap_content"        android:orientation="vertical"        android:paddingLeft="20dp"        android:paddingRight="20dp"        app:layout_behavior="@string/appbar_scrolling_view_behavior">

        <Button            android:id="@+id/btnSimpleSnackbar"            android:layout_width="fill_parent"            android:layout_height="wrap_content"            android:layout_marginTop="30dp"            android:text="Simple Snackbar" />

        <Button            android:id="@+id/btnActionCallback"            android:layout_width="fill_parent"            android:layout_height="wrap_content"            android:layout_marginTop="10dp"            android:text="With Action Callback" />

        <Button            android:id="@+id/btnCustomSnackbar"            android:layout_width="fill_parent"            android:layout_height="wrap_content"            android:layout_marginTop="10dp"            android:text="Custom Color" />
    </LinearLayout>

    <android.support.design.widget.FloatingActionButton        android:id="@+id/fab"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:layout_gravity="end|bottom"        android:layout_margin="16dp"        android:src="@android:drawable/ic_dialog_email" />
</android.support.design.widget.CoordinatorLayout>

3)style.xml


<resources>

    <!-- Base application theme. -->    <style name="AppTheme" parent="Theme.AppCompat.Light.NoActionBar">
        <!-- Customize your theme here. -->    </style>

    <style name="MyMaterialTheme" parent="MyMaterialTheme.Base">
    </style>

    <style name="MyMaterialTheme.Base" parent="Theme.AppCompat.Light.NoActionBar">
        <item name="colorPrimary">@color/colorPrimary</item>
        <item name="colorPrimaryDark">@color/colorPrimaryDark</item>
        <item name="colorAccent">@color/colorAccent</item>
    </style>

</resources>

4)manifest.xml

<?xml version="1.0" encoding="utf-8"?><manifest xmlns:android="http://schemas.android.com/apk/res/android"    package="com.example.admin.snackbar" >

    <application        android:allowBackup="true"        android:icon="@mipmap/ic_launcher"        android:label="@string/app_name"        android:theme="@style/MyMaterialTheme" >
        <activity            android:name=".MainActivity"            android:label="@string/app_name" >

        </activity>
        <activity            android:name=".FloatingLabelActivity"            android:label="@string/app_name" >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />
                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
    </application>
</manifest>