Animation Button

Step 1:

res/layout/Animation.xml

<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout 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"
    tools:context="com.evgenii.sixbouncingbuttons.MainActivity">

    <Button
        android:id="@+id/button_animate"
        android:layout_width="100dp"
        android:layout_height="40dp"
        android:onClick="didTapButton"
        android:background="#FFA400" />

</android.support.constraint.ConstraintLayout>

Step 2:

res/anim/animation.xml

<?xml version="1.0" encoding="utf-8"?>
<set xmlns:android="http://schemas.android.com/apk/res/android" >

    <scale
        android:duration="2000"
        android:fromXScale="0.3"
        android:toXScale="1.0"
        android:fromYScale="0.3"
        android:toYScale="1.0"
        android:pivotX="50%"
        android:pivotY="50%" />
</set>

step 3:

following method use in your activity

method 1:
public void didTapButton(View view) {
    Button button = (Button)findViewById(R.id.button);
    final Animation myAnim = AnimationUtils.loadAnimation(this, R.anim.bounce);
    button.startAnimation(myAnim);
}
method 2:
class MyAnimation implements android.view.animation.Interpolator {
    private double mAmplitude = 1;
    private double mFrequency = 10;

    MyAnimation (double amplitude, double frequency) {
        mAmplitude = amplitude;
        mFrequency = frequency;
    }

    public float getInterpolation(float time) {
        return (float) (-1 * Math.pow(Math.E, -time/ mAmplitude) *
                Math.cos(mFrequency * time) + 1);
    }
}
method 3:
public void didTapButton(View view) {
    Button button = (Button)findViewById(R.id.button);
    final Animation myAnim = AnimationUtils.loadAnimation(this, R.anim.bounce);

    // Use bounce interpolator with amplitude 0.2 and frequency 20
    MyBounceInterpolator interpolator = new MyBounceInterpolator(0.2, 20);
    myAnim.setInterpolator(interpolator);

    button.startAnimation(myAnim);
}

Custom Datepicker Dialog Differend Style

step 1:

activity_main.xml

<RelativeLayout   

 xmlns:android="http://schemas.android.com/apk/res/android"    

xmlns:tools="http://schemas.android.com/tools"    

android:id="@+id/rl"    

android:layout_width="match_parent"    

android:layout_height="match_parent"    

android:padding="10dp"    

tools:context=".MainActivity"    

android:background="#e6eae8"    >
    <Button        

android:id="@+id/btn"        

android:layout_width="wrap_content"       

android:layout_height="wrap_content"        

android:text="Set Date"        />
</RelativeLayout>

step 2:

MainActivity.java

import android.app.DatePickerDialog;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.DatePicker;
import android.widget.EditText;
import android.app.AlertDialog;
import android.app.Dialog;
import android.widget.RelativeLayout;
import android.app.DialogFragment;
import java.util.Calendar;

public class MainActivity extends AppCompatActivity implements View.OnClickListener {

    Button btnDatePicker, btnTimePicker;
    EditText txtDate, txtTime;
    private int mYear, mMonth, mDay, mHour, mMinute,mAMPM;

    @Override    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        final RelativeLayout rl = (RelativeLayout) findViewById(R.id.rl);
        Button btn = (Button) findViewById(R.id.btn);

        btn.setOnClickListener(new View.OnClickListener() {
            @Override           
          public void onClick(View v) {
                // Initialize a new date picker dialog fragment               
        DialogFragment dFragment = new DatePickerFragment();

                // Show the date picker dialog fragment        
        dFragment.show(getFragmentManager(), "Date Picker");
            }
        });
    }

    @Override    public void onClick(View v) {

    }


    public static class DatePickerFragment extends DialogFragment implements DatePickerDialog.OnDateSetListener{

        @Override        public Dialog onCreateDialog(Bundle savedInstanceState){
            final Calendar calendar = Calendar.getInstance();
            int year = calendar.get(Calendar.YEAR);
            int month = calendar.get(Calendar.MONTH);
            int day = calendar.get(Calendar.DAY_OF_MONTH);
            /*                Create a DatePickerDialog using Theme.
                    DatePickerDialog(Context context, int theme, 
                     DatePickerDialog.OnDateSetListener listener,                        
                            int year, int monthOfYear, int dayOfMonth)             */

            // DatePickerDialog THEME_DEVICE_DEFAULT_LIGHT            
                  DatePickerDialog dpd = new DatePickerDialog(getActivity(),
                  AlertDialog.THEME_DEVICE_DEFAULT_LIGHT,this,year,month,day);

            // DatePickerDialog THEME_DEVICE_DEFAULT_DARK            
                    DatePickerDialog dpd2 = new DatePickerDialog(getActivity(),
                    AlertDialog.THEME_DEVICE_DEFAULT_DARK,this,year,month,day);

            // DatePickerDialog THEME_HOLO_LIGHT
                    DatePickerDialog dpd3 = new DatePickerDialog(getActivity(),
                    AlertDialog.THEME_HOLO_LIGHT,this,year,month,day);

            // DatePickerDialog THEME_HOLO_DARK 
                    DatePickerDialog dpd4 = new DatePickerDialog(getActivity(),
                    AlertDialog.THEME_HOLO_DARK,this,year,month,day);

            // DatePickerDialog THEME_TRADITIONAL
                    DatePickerDialog dpd5 = new DatePickerDialog(getActivity(),
                    AlertDialog.THEME_TRADITIONAL,this,year,month,day);

            // Return the DatePickerDialog            
                   return  dpd5;
        }

        public void onDateSet(DatePicker view, int year, int month, int day){
            // Do something with the chosen date        }
    }
}