Slidable ToggleButton)

17:25:01

I saw an article about the slidable ToogleButton on the Internet. I thought it was good with code, but it didn't meet my requirements. So I changed it based on his code. (I can't find the original text, so I have to paste the code .)

Source code: http://download.csdn.net/detail/zshq280017423/4240703

Here are two images:

Then run the Code:

The main class is SlipButton. java.

                          DownX, NowX;       btn_on_left =        btn_off_left =        boolean NowChoose = ;           boolean OnSlip = ;      boolean isChgLsnOn =                                                init() {          bg_on =          bg_off =          slip_btn =           btn_off_left = bg_off.getWidth() -          setOnTouchListener();           onDraw(Canvas canvas) {           Matrix matrix =          Paint paint =                     (NowX < (bg_on.getWidth() / )) {              x = NowX - slip_btn.getWidth() /              canvas.drawBitmap(bg_off, matrix, paint);         }              x = bg_on.getWidth() - slip_btn.getWidth() /              canvas.drawBitmap(bg_on, matrix, paint);            (OnSlip) {              (NowX >= bg_on.getWidth()) {                 x = bg_on.getWidth() - slip_btn.getWidth() / ;             }   (NowX <                  x =              }                  x = NowX - slip_btn.getWidth() /           }  {              (NowChoose) {                 x =                 canvas.drawBitmap(bg_on, matrix, paint);             }                  x =                         x =             isChecked = !            (x < ) {             x =          }   (x > bg_on.getWidth() -             x = bg_on.getWidth() -          canvas.drawBitmap(slip_btn, x, , paint);         boolean onTouch(View v, MotionEvent           (.getAction()) {              MotionEvent.ACTION_DOWN:                  (.getX() >                         || .getY() >                                        OnSlip =                  DownX =                  NowX =                                MotionEvent.ACTION_MOVE:                 Log.d(,  +                  Log.d(,  +                  NowX =                  boolean LastChoose =                   (NowX >= (bg_on.getWidth() /                      NowChoose =                  }                      NowChoose =                     (isChgLsnOn && (LastChoose != NowChoose)) {                                   MotionEvent.ACTION_UP:                 OnSlip =                                         invalidate();                   SetOnChangedListener(OnChangedListener l) {         isChgLsnOn =          ChgLsn =                                   .isChecked =         NowChoose =          onMeasure( widthMeasureSpec,            measuredHeight =          measuredWidth =          measureHeight(                                            measureWidth(                                   }

The code is relatively simple and the comments are more detailed.

Let's talk about some questions:

1. What are the values of event. getX () and event. getY () obtained in the onTouch () method? What is the value range?

At first, I thought that no matter where our SlipButton is placed, the value of event. getX () is the coordinate value relative to the screen ,~~ In fact, it is wrong. event. getX () will get the value only when your touch point falls within the layout range of the current SlipButton view. However, the value range is not only the size of your SlipButton view, because once your touch point is within the view range, the touch point can be moved to any place outside the View, therefore, the value range should be full screen, so we made the following judgment in the Code:

  (.getX() >              || .getY() >        }

2. Why does measureWidth () and measureHeight () return a fixed value?

First, according to the purpose, we do not need to adjust the size of the custom SlipButton View by the caller, because the ToggleButton itself serves as a switch and should be consistent in the application, so I asked the two methods to return a fixed value. For a detailed description of the onMeasure () method root, see my other article: http://www.cnblogs.com/wlrhnh/p/3479928.html

Download the source code. Click here.