Android java app, replacing image on touch

Android java app, replacing image on touch



I just want to say I am very new to java app development.



So I have this image floating around the screen and when I touch the screen I want the image to change colors (switch from image to image1)
I got this working but the image gets moved to starting point, I want the transition to be smooth and to take place where the image is at certain point.



I have this code in my GameView.java class


public class GameView extends SurfaceView implements SurfaceHolder.Callback {

private MainThread thread;
private CharacterSprite characterSprite;
private int col = 0;

public GameView(Context context)
super(context);

getHolder().addCallback(this);

thread = new MainThread(getHolder(),this);
setFocusable(true);




@Override
public void surfaceChanged(SurfaceHolder holder, int format, int width, int height)



@Override
public void surfaceCreated(SurfaceHolder holder)
characterSprite = new CharacterSprite(BitmapFactory.decodeResource(getResources(),R.drawable.avdgreen), 100, 100);
thread.setRunning(true);
thread.start();



@Override
public void surfaceDestroyed(SurfaceHolder holder)
boolean retry = true;
while(retry)
try
thread.setRunning(false);
thread.join();
catch(InterruptedException e)
e.printStackTrace();

retry = false;



public void update()
characterSprite.update();



public boolean onTouchEvent(MotionEvent event)

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

switch (eventaction)
case MotionEvent.ACTION_DOWN:
if(col == 0)
int ox = characterSprite.getX();
int oy = characterSprite.getY();
characterSprite.setX(ox);
characterSprite.setX(oy);
characterSprite = new CharacterSprite(BitmapFactory.decodeResource(getResources(),R.drawable.avdgreen1), ox, oy);

Toast.makeText(getContext(), "ACTION_UP "+"X: "+ox+" Y: "+oy, Toast.LENGTH_LONG).show();

col = 1;
else
int ox = characterSprite.getX();
int oy = characterSprite.getY();
characterSprite.setX(ox);
characterSprite.setX(oy);
characterSprite = new CharacterSprite(BitmapFactory.decodeResource(getResources(),R.drawable.avdgreen), ox, oy);

Toast.makeText(getContext(), "ACTION_UP "+"X: "+ox+" Y: "+oy, Toast.LENGTH_LONG).show();
col = 0;



break;

case MotionEvent.ACTION_MOVE:

break;

case MotionEvent.ACTION_UP:

break;

return true;

@Override
public void draw(Canvas canvas)
super.draw(canvas);
if(canvas!=null)
characterSprite.draw(canvas);




This is where most of work is taking place, I also have CharacterSprite.java class which basicly creates the 'image' and makes it float around the screen:


public class CharacterSprite {
private Bitmap image;
private int x,y;
private int xVelocity = 10;
private int yVelocity = 5;
private int screenWidth = Resources.getSystem().getDisplayMetrics().widthPixels;
private int screenHeight = Resources.getSystem().getDisplayMetrics().heightPixels;


public CharacterSprite(Bitmap bmp, int x, int y)

image = bmp;




public int getX()
return x;


public int getY()
return y;


public void setX(int nx)
x = nx;


public void setY(int ny)
y = ny;


public void draw(Canvas canvas)
canvas.drawBitmap(image,x,y,null);


public void update()

if(x < 0 && y < 0)
x = screenWidth / 2;
y = screenHeight / 2;
else




as You can see I tried to get current x and y and set it back when creating new character, but that did not work, my guess is that this is happening because for a second the image is not on the screen and the whole thing reset but 1. I am not sure if thats right 2. I have no idea how I could fix that.
If anyone could point me where I should search that would be awesome.



@edit:
I changed to this Toast.makeText(getContext(), "ACTION_UP "+"X: "+characterSprite.getX()+" Y: "+characterSprite.getY(), Toast.LENGTH_LONG).show();
To debug and the output I am getting is ACTION_UP X: 0 Y: 0


Toast.makeText(getContext(), "ACTION_UP "+"X: "+characterSprite.getX()+" Y: "+characterSprite.getY(), Toast.LENGTH_LONG).show();


ACTION_UP X: 0 Y: 0




1 Answer
1



ANSWER



Added


public void updateD(Canvas canvas)
canvas.drawBitmap(image,x,y,null);



To CharacterSprite.java and changed:


CharacterSprite.java


if(col == 0)
int ox = 550; //characterSprite.getX();
int oy = 550;//characterSprite.getY();
// characterSprite.setX(ox);
//characterSprite.setX(oy);

characterSprite = new CharacterSprite(BitmapFactory.decodeResource(getResources(),R.drawable.avdgreen1));

Toast.makeText(getContext(), "ACTION_UP "+"X: "+characterSprite.getX()+" Y: "+characterSprite.getY(), Toast.LENGTH_LONG).show();

col = 1;



To:


if(col == 0)
characterSprite.setImg(BitmapFactory.decodeResource(getResources(),R.drawable.avdgreen1));
Toast.makeText(getContext(), "ACTION_UP "+"X: "+characterSprite.getX()+" Y: "+characterSprite.getY(), Toast.LENGTH_LONG).show();

col = 1;






Is that an answer?

– Mohsen
Sep 10 '18 at 18:27






@ʍѳђઽ૯ท yes, my bad forgot to add it in the first line.

– hDDen
Sep 10 '18 at 18:28



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