How to handle right to left swipe gestures?

AndroidMobile DevelopmentApps/Applications

This example demonstrate about How to handle right to left swipe gestures

Step 1 − Create a new project in Android Studio, go to File ⇒ New Project and fill all required details to create a new project.

Step 2 − Add the following code to res/layout/activity_main.xml.

<?xml version = "1.0" encoding = "utf-8"?>
<LinearLayout 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:gravity = "center"
   android:layout_height = "match_parent"
   tools:context = ".MainActivity"
   android:orientation = "vertical">
   <Button
      android:id = "@+id/swap"
      android:layout_width = "wrap_content"
      android:layout_height = "wrap_content"
      android:layout_alignParentTop = "true"
      android:layout_centerHorizontal = "true"
      android:layout_marginTop = "27dp"
      android:text = "Swap here"/>
</LinearLayout>

In the above code, we have taken button view to handle swaps

Step 3 − Add the following code to src/MainActivity.java

package com.example.myapplication;
import android.content.ActivityNotFoundException;
import android.content.Intent;
import android.content.pm.ResolveInfo;
import android.content.res.Configuration;
import android.graphics.PixelFormat;
import android.os.Build;
import android.os.Bundle;
import android.support.annotation.RequiresApi;
import android.support.v7.app.AppCompatActivity;
import android.util.Log;
import android.view.Gravity;
import android.view.LayoutInflater;
import android.view.MotionEvent;
import android.view.View;
import android.view.WindowManager;
import android.widget.Button;
import android.widget.ImageView;
import android.widget.TextView;
import android.widget.Toast;
import java.util.List;
import java.util.Locale;

public class MainActivity extends AppCompatActivity {
   private WindowManager windowManager;
   private ImageView chatHead;
   WindowManager.LayoutParams params;
   @RequiresApi(api = Build.VERSION_CODES.LOLLIPOP)
   @Override
   protected void onCreate(Bundle savedInstanceState) {
      super.onCreate(savedInstanceState);
      setContentView(R.layout.activity_main);
      findViewById(R.id.swap).setOnTouchListener(new OnSwipeTouchListener(MainActivity.this) {
         public void onSwipeTop() {
            Toast.makeText(MainActivity.this, "top", Toast.LENGTH_SHORT).show();
         }
         public void onSwipeRight() {
            Toast.makeText(MainActivity.this, "right", Toast.LENGTH_SHORT).show();
         }
         public void onSwipeLeft() {
            Toast.makeText(MainActivity.this, "left", Toast.LENGTH_SHORT).show();
         }
         public void onSwipeBottom() {
            Toast.makeText(MainActivity.this, "bottom", Toast.LENGTH_SHORT).show();
         }
      });
   }
}

Step 3 − Add the following code to src/ OnSwipeTouchListener.java

package com.example.myapplication;
import android.content.Context;
import android.view.GestureDetector;
import android.view.GestureDetector.SimpleOnGestureListener;
import android.view.MotionEvent;
import android.view.View;
import android.view.View.OnTouchListener;

public class OnSwipeTouchListener implements OnTouchListener {
   private final GestureDetector gestureDetector;
   public OnSwipeTouchListener (Context ctx){
      gestureDetector = new GestureDetector(ctx, new GestureListener());
   }
   @Override
   public boolean onTouch(View v, MotionEvent event) {
      return gestureDetector.onTouchEvent(event);
   }
   private final class GestureListener extends SimpleOnGestureListener {
      private static final int SWIPE_THRESHOLD = 100;
      private static final int SWIPE_VELOCITY_THRESHOLD = 100;
      @Override
      public boolean onDown(MotionEvent e) {
         return true;
      }
      @Override
      public boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX, float velocityY) {
         boolean result = false;
         try {
            float diffY = e2.getY() - e1.getY();
            float diffX = e2.getX() - e1.getX();
            if (Math.abs(diffX) > Math.abs(diffY)) {
               if (Math.abs(diffX) > SWIPE_THRESHOLD && Math.abs(velocityX) > SWIPE_VELOCITY_THRESHOLD) {
                  if (diffX > 0) {
                     onSwipeRight();
                  } else {
                     onSwipeLeft();
                  }
                  result = true;
               }
            }
            else if (Math.abs(diffY) > SWIPE_THRESHOLD && Math.abs(velocityY) > SWIPE_VELOCITY_THRESHOLD) {
               if (diffY > 0) {
                  onSwipeBottom();
               } else {
                  onSwipeTop();
               }
               result = true;
            }
         } catch (Exception exception) {
            exception.printStackTrace();
         }
         return result;
      }
   }
   public void onSwipeRight() {
   }
   public void onSwipeLeft() {
   }
   public void onSwipeTop() {
   }
   public void onSwipeBottom() {
   }
}

Let's try to run your application. I assume you have connected your actual Android Mobile device with your computer. To run the app from android studio, open one of your project's activity files and click Run  icon from the toolbar. Select your mobile device as an option and then check your mobile device which will display your default screen –

Now swipe on button as shown below-


 

Click here to download the project code

raja
Published on 12-Apr-2019 06:50:56
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