private ProgressDialog pDialog;
private SessionManager session;
private SQLiteHandler db;

@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_login);

    inputEmail = (EditText) findViewById(R.id.email);
    inputPassword = (EditText) findViewById(R.id.password);
    btnLogin = (Button) findViewById(R.id.btnLogin);
  btnLinkToRegister = (Button) findViewById(R.id.btnLinkToRegisterScreen);

    // Progress dialog
    pDialog = new ProgressDialog(this);
    pDialog.setCancelable(false);

    // SQLite database handler
    db = new SQLiteHandler(getApplicationContext());

    // Session manager
    session = new SessionManager(getApplicationContext());

    // Check if user is already logged in or not
    if (session.isLoggedIn()) {
        // User is already logged in. Take him to main activity
        Intent intent = new Intent(LoginActivity.this, MainActivity.class);
        startActivity(intent);
        finish();
    }

    // Login button Click Event
    btnLogin.setOnClickListener(new View.OnClickListener() {

        @SuppressLint("NewApi")
        public void onClick(View view) {
            String email = inputEmail.getText().toString().trim();
            String password = inputPassword.getText().toString().trim();

       // Check for empty data in the form
            if (!email.isEmpty() && !password.isEmpty()) {
                // login user
                checkLogin(email, password);
            } else {
                // Prompt user to enter credentials
                Toast.makeText(getApplicationContext(),
                        "Please enter the credentials!", Toast.LENGTH_LONG)
                        .show();
            }
        }

    });

    // Link to Register Screen
   btnLinkToRegister.setOnClickListener(new View.OnClickListener() {

        public void onClick(View view) {
            Intent i = new Intent(getApplicationContext(),
                    RegisterActivity.class);
            startActivity(i);
            finish();
        }
    });

}

/**
 * function to verify login details in mysql db
 * */
private void checkLogin(final String email, final String password) {
    // Tag used to cancel the request
    String tag_string_req = "req_login";

    pDialog.setMessage("Logging in ...");
    showDialog();

    StringRequest strReq = new StringRequest(Method.POST,
            AppConfig.URL_LOGIN, new Response.Listener<String>() {

        @Override
        public void onResponse(String response) {
            Log.d(TAG, "Login Response: " + response.toString());
            hideDialog();

            try {
                JSONObject jObj = new JSONObject(response);
                boolean error = jObj.getBoolean("error");

                // Check for error node in json
                if (!error) {
                    // user successfully logged in
                    // Create login session
                    session.setLogin(true);

                    // Now store the user in SQLite
                    String uid = jObj.getString("uid");

                    JSONObject user = jObj.getJSONObject("user");
                    String name = user.getString("name");
                    String email = user.getString("email");
                   String phone = user.getString("phone");
                    String created_at = user.getString("created_at");

                    // Inserting row in users table
                    db.addUser(name, email,phone, uid, created_at);


                    // Launch main activity
                    Intent intent = new Intent(LoginActivity.this,
                            MainActivity.class);
                    startActivity(intent);
                    finish();
                } else {
                    // Error in login. Get the error message
                    String errorMsg = jObj.getString("error_msg");
                    Toast.makeText(getApplicationContext(),
                            errorMsg, Toast.LENGTH_LONG).show();
                }
            } catch (JSONException e) {
                // JSON error
                e.printStackTrace();
                Toast.makeText(getApplicationContext(), "Json error: " + e.getMessage(), Toast.LENGTH_LONG).show();
            }

        }
    }, new Response.ErrorListener() {

        @Override
        public void onErrorResponse(VolleyError error) {
            Log.e(TAG, "Login Error: " + error.getMessage());
            Toast.makeText(getApplicationContext(),
                    error.getMessage(), Toast.LENGTH_LONG).show();
            hideDialog();
        }
    }) {

        @Override
        protected Map<String, String> getParams() {
            // Posting parameters to login url
            Map<String, String> params = new HashMap<String, String>();
            params.put("email", email);
            params.put("password", password);

            return params;
        }

    };

    // Adding request to request queue
    AppController.getInstance().addToRequestQueue(strReq, tag_string_req);
}

private void showDialog() {
    if (!pDialog.isShowing())
        pDialog.show();
}

private void hideDialog() {
    if (pDialog.isShowing())
        pDialog.dismiss();
}

private TextView txtName;
private TextView txtEmail;
//private TextView txtPhone;
private Button btnLogout;
ImageButton button2,button1,button3;


private SQLiteHandler db;
private SessionManager session;


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

    txtName = (TextView) findViewById(R.id.name);
    txtEmail = (TextView) findViewById(R.id.email);
    button1 = (ImageButton) findViewById(R.id.Button);

    // button3 = (ImageButton) findViewById(R.id.Button2);
 //txtPhone = (TextView) findViewById(R.id.phone);
    btnLogout = (Button) findViewById(R.id.btnLogout);
//   button2 = (ImageButton) findViewById(R.id.Button1);
   //button3 = (ImageButton) findViewById(R.id.Button2);
   //  m = new Mail("internshipait@gmail.tld", "internshipait!!");
  // Add your mail Id and Password


      // SqLite database handler
        db = new SQLiteHandler(getApplicationContext());

        // session manager
        session = new SessionManager(getApplicationContext());

        if (!session.isLoggedIn()) {
            logoutUser();
        }

        // Fetching user details from SQLite
        HashMap<String, String> user = db.getUserDetails();

        String name = user.get("name");
        String email = user.get("email");
    //String phone=user.get("phone");

        // Displaying the user details on the screen
        txtName.setText(name);
        txtEmail.setText(email);
    //txtPhone.setText(phone);

        // Logout button click event
        btnLogout.setOnClickListener(new View.OnClickListener() {

            @Override
            public void onClick(View v) {

                logoutUser();

            }
        });
        /*button1.setOnClickListener(new View.OnClickListener() {
        public void onClick(View view) {
        Intent myIntent = new Intent(view.getContext(), insert.class);
        startActivityForResult(myIntent, 0);
        finish();
        }});

        button2.setOnClickListener(new View.OnClickListener() {
            public void onClick(View view) {
                Intent myIntent = new Intent(view.getContext(), insert1.class);
                startActivityForResult(myIntent, 0);
                finish();
             }});*/



      /*    button3.setOnClickListener(new View.OnClickListener() {
                public void onClick(View view) {
                    Intent myIntent = new Intent(view.getContext(), ReadData.class);
                    startActivityForResult(myIntent, 0);
                    finish();
                 }});*/

            View.OnClickListener handler = new View.OnClickListener() {
                public void onClick(View v) {
                    switch (v.getId()) {

                    case R.id.buttonShareTextUrl:
                        shareTextUrl();
                        break;

                    }
                }
            };


            // our buttons
            findViewById(R.id.buttonShareTextUrl).setOnClickListener(handler);

}

public void process(View view){
    Intent intent=null,chooser=null;
    if(view.getId()==R.id.send_email)
    {
    intent=new Intent(Intent.ACTION_SEND);
    intent.setData(Uri.parse("mailto:"));
    String[] to={"vidyaappait@gmail.com",};
    intent.putExtra(Intent.EXTRA_EMAIL,to);
    intent.putExtra(Intent.EXTRA_SUBJECT, "INTERESTED IN SPONSPORING A CHILD");
    intent.putExtra(Intent.EXTRA_TEXT, "FHHHHHHHHHHHHHHHHHHHHH");
    intent.setType("message/rfc822");
    chooser=Intent.createChooser(intent,"send email");
    startActivity(chooser);
}

}


private void shareTextUrl() {
    Intent share = new Intent(android.content.Intent.ACTION_SEND);
    share.setType("text/plain");
    share.addFlags(Intent.FLAG_ACTIVITY_CLEAR_WHEN_TASK_RESET);

    // Add data to the intent, the receiving app will decide
    // what to do with it.
    share.putExtra(Intent.EXTRA_SUBJECT, "Title Of The Post");
    share.putExtra(Intent.EXTRA_TEXT, "please why don't u download sponsor app  to sponsor amount to needy child. ");
    //share.putExtra(Intent.EXTRA_TEXT, "");

    startActivity(Intent.createChooser(share, "Share link!"));
}


/**
 * Logging out the user. Will set isLoggedIn flag to false in shared
 * preferences Clears the user data from sqlite users table
 * */
private void logoutUser() {
    session.setLogin(false);

    db.deleteUsers();

    // Launching the login activity
    Intent intent = new Intent(MainActivity.this, LoginActivity.class);
    startActivity(intent);
    finish();
}



}

<LinearLayout
      android:layout_width="fill_parent"
      android:layout_height="48dp"
      android:background="#30D5C8"
      android:orientation="horizontal" >

      <ImageView
          android:layout_width="40dp"
          android:layout_height="40dp"
          android:layout_gravity="center"
          android:layout_marginLeft="10dp"
          android:background="@drawable/ambu" />

      <TextView
          android:layout_width="126dp"
          android:layout_height="wrap_content"
          android:layout_gravity="center"
          android:layout_marginLeft="25dp"
          android:text="Login"
          android:textColor="#00008B"
          android:textSize="18sp"
          android:textStyle="bold" />
  </LinearLayout>

    <LinearLayout
        android:layout_width="fill_parent"
        android:layout_height="fill_parent"
        android:layout_marginBottom="30dp"
        android:layout_marginLeft="16dp"
        android:layout_marginRight="16dp"
        android:layout_marginTop="16dp"
        android:background="@drawable/greybackground"
        android:gravity="center_horizontal"
        android:orientation="vertical" >

        <TextView
            android:id="@+id/textView"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_alignParentTop="true"
            android:layout_centerHorizontal="true"
            android:layout_gravity="center"
            android:textStyle="bold"
            android:text="Welcome to Vidya app"
            android:textColor="#E75480" />

        <ImageView
            android:layout_width="100dp"
            android:layout_height="100dp"
            android:layout_marginTop="15dp"
            android:background="@drawable/kavi" />

         </LinearLayout>
         <EditText
            android:id="@+id/email"
            android:layout_width="280dp"
            android:layout_height="fill_parent"
            android:layout_gravity="center"
            android:layout_marginBottom="10dp"
            android:background="@color/grey"
            android:ems="10"
            android:hint="@string/hint_email"
            android:inputType="textEmailAddress"
            android:padding="10dp"
            android:singleLine="true"
            android:textColor="@drawable/cl"
            android:textColorHint="@color/input_login_hint" />

        <EditText
            android:id="@+id/password"
            android:layout_width="280dp"
            android:layout_height="wrap_content"
            android:layout_gravity="center"
            android:layout_marginBottom="10dp"
            android:background="@color/grey"
            android:ems="10"
            android:hint="@string/hint_password"
            android:inputType="textPassword"
            android:padding="10dp"
            android:singleLine="true"
            android:textColor="@color/input_login"
            android:textColorHint="@color/input_login_hint" >

            <requestFocus />
        </EditText>



    <!-- Login Button -->

        <Button
            android:id="@+id/btnLogin"
            android:layout_width="190dp"
            android:layout_height="38dp"
            android:layout_gravity="center_horizontal"
            android:layout_marginTop="16dip"
            android:background="@drawable/btn"
            android:text="@string/btn_login"
            android:textColor="@color/btn_login"
            android:textSize="13dp" />

        <Button
            android:id="@+id/btnLinkToRegisterScreen"
            android:layout_width="293dp"
            android:layout_height="wrap_content"
            android:layout_gravity="center"
            android:layout_marginTop="10dip"
            android:background="@null"
            android:text="@string/btn_link_to_register"
            android:textAllCaps="false"
            android:textSize="10dp" />

    <!-- Link to Login Screen -->
    </LinearLayout>

</ScrollView>

<LinearLayout
    android:layout_width="fill_parent"
    android:layout_height="500dp"
    android:background="@color/white"
    android:orientation="vertical" />

  <LinearLayout android:id="@+id/linearLayout1"
      android:layout_width="fill_parent"
       android:layout_height="wrap_content"
      android:layout_centerHorizontal="true"

    android:layout_marginLeft="20dp"
     android:layout_marginRight="20dp"
      android:gravity="center"
      android:orientation="vertical">

<ImageButton
        android:id="@+id/Button"
        android:layout_width="62dp"
        android:layout_height="65dp"
        android:adjustViewBounds="true"
        android:background="@null"
        android:scaleType="fitCenter"
        android:src="@drawable/search2" />



     <Button
         android:id="@+id/send_email"
         android:layout_width="147dp"
         android:layout_height="wrap_content"
         android:layout_marginTop="20dp"
          android:background="@drawable/cl"
         android:text="@string/faid"
        android:onClick="process"/>

     <Button
         android:id="@+id/buttonShareTextUrl"
         android:layout_width="208dp"
         android:layout_height="wrap_content"
         android:layout_marginTop="20dp"
         android:background="@drawable/greybackground"
         android:text="@string/ex" />

    <RelativeLayout
        android:layout_width="fill_parent"
        android:layout_height="fill_parent"
        android:layout_alignParentLeft="true"
        android:layout_alignParentRight="true"
        android:layout_alignParentTop="true"
        android:gravity="bottom"
        android:orientation="vertical" >
    </RelativeLayout>
</LinearLayout>

<ScrollView
       xmlns:android="http://schemas.android.com/apk/res/android"
         xmlns:tools="http://schemas.android.com/tools"
        android:id="@+id/scrollView1"
        android:layout_width="fill_parent"
        android:layout_height="fill_parent" >

<LinearLayout
    android:layout_width="fill_parent"
    android:layout_height="500dp"
    android:background="#89CFF0"
    android:orientation="vertical" >

    <LinearLayout
        android:layout_width="fill_parent"
        android:layout_height="48dp"
        android:layout_alignParentTop="true"
        android:background="#89CFF0"
        android:orientation="horizontal" >

        <ImageView
            android:layout_width="40dp"
            android:layout_height="40dp"
            android:layout_marginLeft="10dp"
            android:background="@drawable/kavi" />

        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_gravity="center_horizontal|center_vertical"
            android:layout_marginLeft="25dp"
            android:text="Registration form"
            android:textColor="#00008B"
            android:textSize="18sp"
            android:textStyle="bold" />

        <LinearLayout
            android:layout_width="fill_parent"
            android:layout_height="48dp"
            android:gravity="right"
            android:orientation="horizontal" >

            <ImageView
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:background="@drawable/tick" />
        </LinearLayout>
    </LinearLayout>

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="520dp"
        android:layout_marginBottom="30dp"
        android:layout_marginLeft="16dp"
        android:layout_marginRight="18dp"
        android:layout_marginTop="16dp"
        android:layout_weight="0.01"
        android:background="@drawable/cl"
        android:orientation="vertical" >

        <ImageView
            android:layout_width="136dp"
            android:layout_height="100dp"
            android:layout_gravity="center"
            android:layout_marginTop="15dp"
            android:background="@drawable/kavi" />

        <EditText
            android:id="@+id/name"
            android:layout_width="fill_parent"
            android:layout_height="40dp"
            android:layout_marginTop="30dp"
            android:background="#f3f3f3"
            android:hint="name"
            android:inputType="textCapWords"
            android:paddingLeft="5dp" />

        <EditText
            android:id="@+id/email"
            android:layout_width="fill_parent"
            android:layout_height="40dp"
            android:layout_marginTop="15dp"
            android:background="#f3f3f3"
            android:hint="email"
            android:inputType="textEmailAddress"
            android:paddingLeft="5dp" />

        <EditText
            android:id="@+id/phone"
            android:layout_width="fill_parent"
            android:layout_height="40dp"
            android:layout_marginTop="15dp"
            android:background="#f3f3f3"
            android:hint="Phone"
            android:inputType="number"
            android:paddingLeft="5dp" />

        <EditText
            android:id="@+id/password"
            android:layout_width="fill_parent"
            android:layout_height="40dp"
            android:layout_marginTop="15dp"
            android:background="#f3f3f3"
            android:hint="Password"
            android:inputType="textPassword"
            android:paddingLeft="5dp" />

        <requestFocus />

        <Button
            android:id="@+id/btnRegister"
            android:layout_width="190dp"
            android:layout_height="38dp"
            android:layout_gravity="center_horizontal"
            android:layout_marginTop="16dp"
            android:background="@drawable/btn"
            android:text="Register"
            android:textColor="#fff" />

        <Button
            android:id="@+id/btnLinkToLoginScreen"
            android:layout_width="fill_parent"
            android:layout_height="wrap_content"
            android:layout_marginTop="20dip"
            android:background="@null"
            android:text="@string/btn_link_to_login"
            android:textAllCaps="false"
            android:textSize="12dp" />
    </LinearLayout>

    <LinearLayout
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:orientation="vertical" >
    </LinearLayout>
</LinearLayout>

</ScrollView>