Example Of Swipe Up/Down Like A Facebook Comments..

Swipe Up Or Down Activity

      // AndroidManifest.xml

        <activity
            android:name=".PopupActivity"
            android:theme="@android:style/Theme.Translucent.NoTitleBar">
        </activity>
        
       // PopupActivity.java
       
      package com.project.walkby;

      import android.animation.Animator;
      import android.animation.ObjectAnimator;
      import android.app.Activity;
      import android.graphics.Point;
      import android.os.Bundle;
      import android.view.Display;
      import android.view.MotionEvent;
      import android.view.View;
      import android.widget.LinearLayout;
      import android.widget.RelativeLayout;

      public class PopupActivity extends Activity implements View.OnTouchListener{

          private LinearLayout baseLayout;

          private int previousFingerPosition = 0;
          private int baseLayoutPosition = 0;
          private int defaultViewHeight;

          private boolean isClosing = false;
          private boolean isScrollingUp = false;
          private boolean isScrollingDown = false;

          @Override
          protected void onCreate(Bundle savedInstanceState){
              super.onCreate(savedInstanceState);
              setContentView(R.layout.activity_popup_facebook);
              baseLayout = (LinearLayout) findViewById(R.id.base_popup_layout);
              baseLayout.setOnTouchListener(this);
          }


          public boolean onTouch(View view, MotionEvent event) {

              // Get finger position on screen
              final int Y = (int) event.getRawY();

              // Switch on motion event type
              switch (event.getAction() & MotionEvent.ACTION_MASK) {

                  case MotionEvent.ACTION_DOWN:
                      // save default base layout height
                      defaultViewHeight = baseLayout.getHeight();

                      // Init finger and view position
                      previousFingerPosition = Y;
                      baseLayoutPosition = (int) baseLayout.getY();
                      break;

                  case MotionEvent.ACTION_UP:
                      // If user was doing a scroll up
                      if(isScrollingUp){
                          // Reset baselayout position
                          baseLayout.setY(0);
                          // We are not in scrolling up mode anymore
                          isScrollingUp = false;
                      }

                      // If user was doing a scroll down
                      if(isScrollingDown){
                          // Reset baselayout position
                          baseLayout.setY(0);
                          // Reset base layout size
                          baseLayout.getLayoutParams().height = defaultViewHeight;
                          baseLayout.requestLayout();
                          // We are not in scrolling down mode anymore
                          isScrollingDown = false;
                      }
                      break;
                  case MotionEvent.ACTION_MOVE:
                      if(!isClosing){
                          int currentYPosition = (int) baseLayout.getY();

                          // If we scroll up
                          if(previousFingerPosition >Y){
                              // First time android rise an event for "up" move
                              if(!isScrollingUp){
                                  isScrollingUp = true;
                              }

                          // Has user scroll down before -> view is smaller than it's default size -> resize it instead of change it position
                          if(baseLayout.getHeight()<defaultViewHeight){
                              baseLayout.getLayoutParams().height = baseLayout.getHeight() - (Y - previousFingerPosition);
                              baseLayout.requestLayout();
                          }
                          else {
                              // Has user scroll enough to "auto close" popup ?
                              if ((baseLayoutPosition - currentYPosition) > defaultViewHeight / 4) {
                                  closeUpAndDismissDialog(currentYPosition);
                                  return true;
                              }

                              //
                          }
                          baseLayout.setY(baseLayout.getY() + (Y - previousFingerPosition));

                      }
                      // If we scroll down
                      else{

                          // First time android rise an event for "down" move
                          if(!isScrollingDown){
                              isScrollingDown = true;
                          }

                          // Has user scroll enough to "auto close" popup ?
                          if (Math.abs(baseLayoutPosition - currentYPosition) > defaultViewHeight / 2)
                          {
                              closeDownAndDismissDialog(currentYPosition);
                              return true;
                          }

                          // Change base layout size and position (must change position because view anchor is top left corner)
                          baseLayout.setY(baseLayout.getY() + (Y - previousFingerPosition));
                          baseLayout.getLayoutParams().height = baseLayout.getHeight() - (Y - previousFingerPosition);
                          baseLayout.requestLayout();
                      }

                      // Update position
                      previousFingerPosition = Y;
                  }
                  break;
              }
              return true;
          }

          public void closeUpAndDismissDialog(int currentPosition){
              isClosing = true;
              ObjectAnimator positionAnimator = ObjectAnimator.ofFloat(baseLayout, "y", currentPosition, -baseLayout.getHeight());
              positionAnimator.setDuration(500);
              positionAnimator.addListener(new Animator.AnimatorListener() {
                @Override
                public void onAnimationStart(Animator animator) {

                }

                @Override
                public void onAnimationEnd(Animator animator) {
                  finish();
                }

                @Override
                public void onAnimationCancel(Animator animator) {

                }

                @Override
                public void onAnimationRepeat(Animator animator) {

                }
              });
              positionAnimator.start();
          }

          public void closeDownAndDismissDialog(int currentPosition){
              isClosing = true;
              Display display = getWindowManager().getDefaultDisplay();
              Point size = new Point();
              display.getSize(size);
              int screenHeight = size.y;
              ObjectAnimator positionAnimator = ObjectAnimator.ofFloat(baseLayout, "y", currentPosition, screenHeight+baseLayout.getHeight());
              positionAnimator.setDuration(500);
              positionAnimator.addListener(new Animator.AnimatorListener() {
                @Override
                public void onAnimationStart(Animator animator) {

                }

                @Override
                public void onAnimationEnd(Animator animator) {
                  finish();
                }

                @Override
                public void onAnimationCancel(Animator animator) {

                }

                @Override
                public void onAnimationRepeat(Animator animator) {

                }
              });
              positionAnimator.start();
          }

      }
      
      //Activicty_popup_facebook.xml
      <?xml version="1.0" encoding="utf-8"?>
      <LinearLayout
          xmlns:android="http://schemas.android.com/apk/res/android"
          android:id="@+id/base_popup_layout"
          android:layout_width="match_parent"
          android:layout_height="match_parent"
          android:padding="5dp"
          android:background="@drawable/rounded_popup_facebook">
          <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
                        xmlns:tools="http://schemas.android.com/tools"
                        xmlns:app="http://schemas.android.com/apk/res-auto"
                        android:layout_width="match_parent"
                        android:layout_height="match_parent"
                        android:orientation="vertical">
          <TextView
              android:padding="5dp"
              android:text="25 Message"
              android:textSize="15dp"
              android:textStyle="bold"
              android:layout_width="match_parent"
              android:layout_height="wrap_content"/>


          <include
              layout="@layout/message_type"
              android:layout_width="match_parent"
              android:layout_weight="1"
              android:layout_height="wrap_content"
              android:gravity="bottom" />
          </LinearLayout>

      </LinearLayout>

      //rounded_popup_facebook.xm
      <?xml version="1.0" encoding="utf-8"?>
      <shape xmlns:android="http://schemas.android.com/apk/res/android">
          <corners android:radius="5dp" />
          <solid android:color="#ffffff" />
      </shape>