MattDrewery MattDrewery - 5 months ago 19
Android Question

Android MotionEvent for Touch being held down?

I have just started developing in Android and I am trying to make a very basic game where you have to move a bat along the bottom of the screen and catch items while avoiding bombs.

The problem I am having is I want the bat to move along the bottom of the screen when you hold your finger on the left or the right side of the screen.

Currently I can get the bat to move a few pixels across when the user touches the screen but I can not get it to keep moving until the user removes his finger from the screen.

Here is my (very) basic code so far :

package com.mattdrewery.supercatch;

import android.view.View;
import android.view.MotionEvent;
import android.content.Context;
import android.graphics.Canvas;

public class GameView extends View
{
private Catcher catcher;

public GameView(Context context)
{
super(context);
setFocusable(true);

// Create the catcher
catcher = new Catcher(context, R.drawable.catcher, 240, 250);
}

@Override
protected void onDraw(Canvas canvas)
{
// Draw the catcher to the canvas
canvas.drawBitmap(catcher.getImage(), catcher.getPosX(), catcher.getPosY(), null);

// Redraw the screen
invalidate();
}

@Override
public boolean onTouchEvent(MotionEvent event)
{
// Get the action from the touch screen
int eventAction = event.getAction();

int X = (int) event.getX();
int Y = (int) event.getY();

// If the user presses on the screen....
if (eventAction == MotionEvent.ACTION_DOWN)
{
catcher.moveLeft();
}

// Redraw the screen
invalidate();

return true;
}
}


The catcher.moveLeft() method is as follows:

public void moveLeft()
{
posX -= 5;
}


Any help with this matter would be greatly appreciated! :)

Answer

I think this might just work:

boolean actionUpFlag = false;


if (eventAction == MotionEvent.ACTION_DOWN)
        {
            actionUpFlag = true;
        }
else if (eventAction == MotionEvent.ACTION_UP)
        {
             actionUpFlag = false;
        }

while (actionUpFlag)
{
     catcher.moveLeft();
}

Is this what you are looking for ?

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