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Question

我只在单击按钮时才尝试画一个圆圈。要移动圆圈，必须单击一个按钮才能进行移动。 bclick 的初始值为 false，但是在单击按钮后，bclick 的值一直变为 true。如何使每次画完圆圈后bclick总是设置为false？

我的视图类：

  @Override
        public boolean onTouchEvent(MotionEvent event) {

                x = event.getX();
                y = event.getY();


                switch (event.getAction()) {
                case MotionEvent.ACTION_DOWN:


                if (MainActivity.isButtonClicked() == true ){

                                      canvas.drawCircle(x, y, radius, paint)

                                 invalidate();
                              }

                           break;
                      case MotionEvent.ACTION_MOVE:

                          lastx = event.getX();
                          lasty = event.getY();
                if (MainActivity.isMoveButtonClicked() == true && Mainactivity.is ButtonCLicked() == false ){

                                      canvas.drawCircle(lastx, lasty, radius, paint)

                     invalidate();// if this is used, the moving is slow and doesnt move to the exact spot at (lastx, laxyy)
                              }

                           break;
            }

我的主要活动：

boolean bclick =false;
    boolean mbclick =false;

drawbutton.setOnClickListener(new OnClickListener() {

            @Override
            public void onClick(View arg0) {

            bclick = true;

            }


        });

        bclick = false;

                movebutton.setOnClickListener(new OnClickListener() {

            @Override
            public void onClick(View arg0) {

                   mbclick = true;

            }


        });

               mbclick = false;


public static boolean isButtonClicked() {
        return bclick;
    }

public static void setButtonClicked(boolean torf)
    {
      bclick = torf;
    }

public static boolean isMoveButtonClicked() {
        return mbclick;
    }

public static void setMoveButtonClicked(boolean torf)
    {
      mbclick = torf;
    }

Answer 1

你可以创建一个方法来绘制圆圈并检查它，

 if(circleIsDrawn){

      bClick = false;

}

Answer 2

 @Override
public boolean onTouchEvent(MotionEvent event) {

        x = event.getX();
        y = event.getY();


        switch (event.getAction()) {
        case MotionEvent.ACTION_DOWN:

        if (MainActivity.isButtonClicked() == true ){

                              canvas.drawCircle(x, y, radius, paint)
                              bClick=false;
                         invalidate();
                      }

                   break;
    }