Question

我移动图像时出现问题，当它移动到屏幕外时我想在屏幕大小的边界内移动如何解决它这是该图像的触摸列表代码。

private ImageView nail_cleaner;
RelativeLayout re_layout;

PointF DownPT = null; 
PointF StartPT = null;

@Override
public boolean onTouch(View v, MotionEvent event) {
    startMoving(nail_cleaner, event);
    return true;
}

public void startMoving(ImageView img, MotionEvent event) {
    int eid = event.getAction();
    switch (eid) {
    case MotionEvent.ACTION_MOVE:

        PointF mv = new PointF(event.getX() - DownPT.x, event.getY()
                - DownPT.y);
        img.setX((int) (StartPT.x + mv.x));
        img.setY((int) (StartPT.y + mv.y));
        StartPT = new PointF(img.getX(), img.getY());
        if (event.getX() == event.getX()) {

        }

        break;
    case MotionEvent.ACTION_DOWN:
        DownPT.x = event.getX();
        DownPT.y = event.getY();
        StartPT = new PointF(img.getX(), img.getY());
        Log.e("get points : ", img.getX() + "" + img.getY());
        break;
    }
}

@Override
protected void onCreate(Bundle savedInstanceState) {
    // TODO Auto-generated method stub
    super.onCreate(savedInstanceState);
    requestWindowFeature(Window.FEATURE_NO_TITLE);
    setContentView(R.layout.clean_wash);

    re_layout = (RelativeLayout) findViewById(R.id.layout_clean);
    nail_cleaner = (ImageView) findViewById(R.id.id_nail_cleaner);

    DownPT = new PointF();
    StartPT = new PointF(); 
    nail_cleaner.setOnTouchListener(this);



}

如果我移动图像它会移回另一个图像，我想将这个图像移到另一个图像前面，

Answer 1

    case MotionEvent.ACTION_MOVE:

    PointF mv = new PointF(event.getX() - DownPT.x, event.getY()
            - DownPT.y);
int imgWidth = img.getWidth()/2;
int imgHeight = img.getHeight()/2;
if(StartPT.x + mv.x + imgWidth > 0 && StartPT.x + mv.x + imgWidth < ScreenWidth){
        img.setX((int) (StartPT.x + mv.x));}
if(StartPT.y + mv.y + imgHeight > 0 && StartPT.y + mv.y + imgHeight < ScreenHeight){
        img.setY((int) (StartPT.y + mv.y));}
        StartPT = new PointF(img.getX(), img.getY());


    break;

你必须这样做

Answer 2

根据屏幕尺寸设置屏幕边界，然后检查每面墙，例如左墙if(img.getX() <= 0) img.setX(0);

Answer 3

请参阅我只更新您的答案

private ImageView nail_cleaner;
RelativeLayout re_layout;

PointF DownPT = null; 
PointF StartPT = null;

@Override
public boolean onTouch(View v, MotionEvent event) {
    startMoving(nail_cleaner, event);
    return true;
}

public void startMoving(ImageView img, MotionEvent event) {
    int eid = event.getAction();

     //Get the device height and width

     DisplayMetrics displaymetrics = new DisplayMetrics();
     getWindowManager().getDefaultDisplay().getMetrics(displaymetrics);
     int height = displaymetrics.heightPixels;
     int wwidth = displaymetrics.widthPixels;


    switch (eid) {
    case MotionEvent.ACTION_MOVE:

    /*Check the current x position is less than width of device if get true then move   the object */
         if(event.getX() < (wwidth-10)){ 
              PointF mv = new PointF(event.getX() - DownPT.x, event.getY()
                - DownPT.y);
              img.setX((int) (StartPT.x + mv.x));
              img.setY((int) (StartPT.y + mv.y));
              StartPT = new PointF(img.getX(), img.getY());
        }



        break;
    case MotionEvent.ACTION_DOWN:
        DownPT.x = event.getX();
        DownPT.y = event.getY();
        StartPT = new PointF(img.getX(), img.getY());
        Log.e("get points : ", img.getX() + "" + img.getY());
        break;
    }
}

@Override
protected void onCreate(Bundle savedInstanceState) {
    // TODO Auto-generated method stub
    super.onCreate(savedInstanceState);
    requestWindowFeature(Window.FEATURE_NO_TITLE);
    setContentView(R.layout.clean_wash);

    re_layout = (RelativeLayout) findViewById(R.id.layout_clean);
    nail_cleaner = (ImageView) findViewById(R.id.id_nail_cleaner);

    DownPT = new PointF();
    StartPT = new PointF(); 
    nail_cleaner.setOnTouchListener(this);



}

如何在屏幕边界移动图像

3 个答案: