问题
I´ve created a costum view, and on the onDrawMethod i´ve started to draw some things. A few rects,lines, and a text.
canvas.drawText("Hello",150,150, paint);
Now, I want to change this text, after an OnTouchEvent.
My problem is, that I don´t know, how to remove the old text. At the moment my second text, which is shown after the TouchEvent, is just overlapping my old text. Should I redraw my hole view with the new text?
回答1:
Typically you would redraw the entire view if a lot of things are going, but in this scenario you can just draw a box with the same color as the background over the old text, then display the new text on top of it.
If you have a background image, though, then it would be easier just to re-create the whole canvas.
来源：https://stackoverflow.com/questions/4423436/android-canvas-drawing-text-and-change-text-afterwards