拖动ImageView的或位图触摸后 [英] Drag ImageView Or Bitmap Upon Touch
问题描述
我现在有什么工作，我可以在屏幕上水平拖动一个框（我想要它做的事）。但是，当您单击任意位置在屏幕上它的工作原理，我要被点击的盒子时，它只能工作。我曾尝试用不同的方式实现这一点，我已经看了所有的地方，但仍保持丢失。任何人可以帮助？我也想不出一个位图如何放置（我使用位图，现在，我不能为我的生活弄清楚如何实现我的SurfaceView内ImageView的）。如果我说我的位图放置在0,0的意愿，根据其左上角0,0放置位图？我也有停止的盒子，当它达到了一个边缘的算法，但我只好重写，因为我必须将其删除。请，如果你可以提供你的知识，我将不胜AP preciate它
公共类BoardView扩展SurfaceView实现SurfaceHolder.Callback {
上下文mContext; 私人BoardThread螺纹;
私人浮动box_x = 140;
私人浮动box_y = 378;
ImageView的I =（ImageView的）findViewById（R.id.box_view）; 位图箱=
（BitmapFactory.de codeResource
（getResources（），R.drawable.box））;
私人浮动boxWidth = box.getWidth（）;
私人浮动boxHeight = box.getHeight（）; 公共BoardView（上下文的背景下）{
超级（上下文）;
// surfaceHolder规定，我们在画布上绘制
。getHolder（）的addCallback（本）;
//控制图纸
线程=新BoardThread（getHolder（），这一点）;
//拦截触摸事件
setFocusable（真）; }
@覆盖 公共无效的onDraw（帆布油画）{
canvas.drawColor（Color.WHITE）;
//抽奖箱，并设置起始位置
canvas.drawBitmap（盒，box_x - （boxWidth / 2），
box_y - （boxHeight / 2），空）;
} @覆盖
公共布尔onTouchEvent（MotionEvent事件）{ //布尔模式= FALSE; 如果（event.getAction（）== MotionEvent.ACTION_DOWN）{
// INT X =（INT）event.getX（）;
// INT Y =（int）的event.getY（）; //如果（X GT; box_x＆放大器;＆放大器; X＆下; box_x + 29＆放大器;＆放大器y与其所连接; box_y＆放大器;＆放大器; Y＆下; box_y + 30）{
//模式=真实的;
box_x =（int）的event.getX（）;
//}
} 如果（event.getAction（）== MotionEvent.ACTION_MOVE）{
// INT X =（INT）event.getX（）;
// INT Y =（int）的event.getY（）; //如果（模式==真）{
box_x =（int）的event.getX（）;
//}
} 无效（）; 返回true;
}
@覆盖
公共无效surfaceChanged（SurfaceHolder持有人，
INT格式，诠释的宽度，高度INT）{ }
@覆盖
公共无效surfaceCreated（SurfaceHolder持有人）{
thread.startRunning（真）;
thread.start（）;
} @覆盖
公共无效surfaceDestroyed（SurfaceHolder持有人）{
thread.startRunning（假）;
使用Thread.stop（）;
}}
只需点击触摸事件的X和Y坐标，并检查该X，Y-组合框的范围内。我可以看到你在正确的道路上通过查看注释掉code。
做这样的事情：
RectF RECT =新RectF（X，Y，X + box.getWidth（），Y + box.geHeight（））;如果（rect.contains（touchX，敏感））{
//你打箱子，让拖...
}
I currently have something working where I can drag a box horizontally on the screen (what I want it to do). However, it works when you click ANYWHERE on the screen, and I want it to work only when the box has been clicked. I have tried implementing this in different ways, and I've looked all over the place and still remain lost. Can anybody help? I also can't figure out how a bitmap is placed (I'm using a bitmap right now as I can't for the life of me figure out how to implement the ImageView inside my SurfaceView). If I say my bitmap is placed at 0,0 will that place the bitmap according to its top left corner at 0,0? I also had an algorithm for stopping the box when it reached an edge, but I'll just have to rewrite that as I must have deleted it. Please if you can offer your knowledge I would GREATLY appreciate it
public class BoardView extends SurfaceView implements SurfaceHolder.Callback{
Context mContext;
private BoardThread thread;
private float box_x = 140;
private float box_y = 378;
ImageView i = (ImageView) findViewById(R.id.box_view);
Bitmap box =
(BitmapFactory.decodeResource
(getResources(), R.drawable.box));
private float boxWidth = box.getWidth();
private float boxHeight = box.getHeight();
public BoardView(Context context){
super(context);
//surfaceHolder provides canvas that we draw on
getHolder().addCallback(this);
// controls drawings
thread = new BoardThread(getHolder(),this);
//intercepts touch events
setFocusable(true);
}
@Override
public void onDraw(Canvas canvas){
canvas.drawColor(Color.WHITE);
//draw box and set start location
canvas.drawBitmap(box, box_x - (boxWidth/2),
box_y - (boxHeight/2), null);
}
@Override
public boolean onTouchEvent(MotionEvent event){
//boolean mode = false;
if(event.getAction() == MotionEvent.ACTION_DOWN){
//int x = (int)event.getX();
//int y = (int)event.getY();
//if (x > box_x && x < box_x + 29 && y > box_y && y < box_y + 30){
//mode = true;
box_x = (int)event.getX();
//}
}
if(event.getAction() == MotionEvent.ACTION_MOVE) {
//int x = (int)event.getX();
//int y = (int)event.getY();
//if (mode == true){
box_x = (int)event.getX();
//}
}
invalidate();
return true;
}
@Override
public void surfaceChanged(SurfaceHolder holder,
int format, int width, int height ){
}
@Override
public void surfaceCreated(SurfaceHolder holder){
thread.startRunning(true);
thread.start();
}
@Override
public void surfaceDestroyed(SurfaceHolder holder){
thread.startRunning(false);
thread.stop();
}
}
Simply check the touch event x and y coordinate, and check if this x,y-combination is within the box's bounds. I can see you are on the right path by looking at your commented out code.
Do something like this:
RectF rect = new RectF(x,y, x + box.getWidth(), y+box.geHeight());
if(rect.contains(touchX, touchY)) {
// You hit the box, allow dragging...
}
这篇关于拖动ImageView的或位图触摸后的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
