Is it possible, to run another activity, by swipe of hand with using ViewPager? I've saw some examples, but I don't think it was what I wanted. I'd like to have three activities:

• actual forecast (main)
• hourly forecast (swiped left)
• daily forecast (swiped right)

I'd like to have them displayed, after hand swipe in some direction(if it's possible - does activity after changed are being closed, or just paused?)

As far as I've saw on some examples, I have to implement RecyclerView adapter - since I want to display different data for different activities, do I need to have three separated adapters?

I'm trying to get this done with mvvm, and I've found this one very confusing for me.

CodePudding user response：

you need one Activity and three Fragments. In HERE you can find an official doc how to implement that. Keeping three Activities inside ViewPager/adapter isn't possible

CodePudding user response：

You don't need a recycler view for this. You can switch between activities by sliding left or right. Follow the steps:

1. Create a class named OnSwipeTouchListener.java and paste this code:

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() {
    }
}

And then on your activity's root view, add this code:

binding.getRoot().setOnTouchListener(new OnSwipeTouchListener(MyActivity.this) {
    public void onSwipeTop() {
        // we don't need it but still I have given it
    }
    public void onSwipeRight() {
        Intent intent = new Intent(MyActivity.this, DailyForecastActivity.class);
        startActivity(intent);
    }
    public void onSwipeLeft() {
        Intent intent = new Intent(MyActivity.this, HourlyForecastActivity.class);
        startActivity(intent);
    }
    public void onSwipeBottom() {
        // we don't need it but I have given it
    }

});

Below is completely optional code. If you want animations while swiping, add it

And, don't forget to add this line of code in your DailyForecastActivity's onCreate() method:

overridePendingTransition(R.anim.silde_in_right,0);

where R.anim.silde_in_right is a animation file with this code:

<?xml version="1.0" encoding="utf-8"?>
<set xmlns:android="http://schemas.android.com/apk/res/android">
    <translate
        android:duration="150"
        android:fromXDelta="100%p"
        android:toXDelta="0"/>
</set>

Also, don't forget to add this line of code in your HourlyForecastActivity's onCreate() method:

overridePendingTransition(R.anim.silde_out_right,0);

where R.anim.silde_out_right is a animation file with this code:

<?xml version="1.0" encoding="utf-8"?>
<set xmlns:android="http://schemas.android.com/apk/res/android">
    <translate
        android:duration="150"
        android:fromXDelta="0"
        android:toXDelta="100%p"/>
</set>