Apps Keep sprite movement speed the same on every device.

[tylers12345]

Hello,
I have made a simple android game, similar to flappy birds. When testing, I have found what the speed of the movements such as flying up or falling are good on my One Plus One (1920x1080 401 ppi), but when I tested on a smaller phone with a resolution of 480 x 854 and 196 ppi I found that it was a lot faster flying up and falling.

Is there any way of keeping the speed the same across all device sizes and types?

This is my movement code:

In my bird sprite file:

private int GRAVITY_LIMIT = -30;
public int gravity = 0;

//gravity
        if(gravity>GRAVITY_LIMIT){
            gravity= gravity-2;
        }
        //fall
        y= y-gravity;

When rendering:

canvas.drawBitmap(bmp1, x, y, null);

When jump is triggered:

bird.gravity=30;

Feel free to ask for more information Thankyou to anyone who helps.