我怎样才能实现onTouch功能的Andr​​oid？ [英] How can I implement onTouch function android?

问题描述

您好我想创建aplication它加载大的图像和简单的手势，我可以通过它移动。我要像打印出来，但我无法实现onTouch因此它保持静止。任何帮助preseated。谢谢

我的code绘制出来的画面：

  @覆盖保护无效的OnDraw（帆布油画）{
          super.onDraw（画布）;
                   涂料粉刷=新的油漆（）;
            paint.setStyle（Paint.Style.FILL）;

            //使整个画布白色
            paint.setColor（Color.WHITE）;
            canvas.drawPaint（油漆）;
paint.setStrokeWidth（1）;
            paint.setPathEffect（空）;
            paint.setColor（Color.GRAY）;
            paint.setAntiAlias​​（真正的）;


            的for（int i = 1; I＆LT; 100;我++）{
                canvas.drawLine（0，I * 1，600，I * 20，油漆）;
                canvas.drawLine（I * 1，0，I * 20，600，油漆）;
            }
}
 

解决方案

在你看来，你需要创建OnTouchListener，这应该是这个样子：

  myView.setOnTouchListener（新View.OnTouchListnener（）{
    @覆盖
    公共布尔onTouch（视图V，MotionEvent E）{
        开关（e.getAction（））{
        案例MotionEvent.ACTION_DOWN：
        //和code会在这里把手指在屏幕上
 

我会看看 MotionEvent 并寻找各种水平。你要注意它是如何打包的移动信息数位成一个 MotionEvent。

Hi I want to create aplication which loads large image, and simple gesture I can move across it. I have to image printed out but I can not implement onTouch so it remains stationary. Any help apreseated. Thanks

My code for drawing out the picture:

@Override protected void onDraw(Canvas canvas) {
          super.onDraw(canvas);
                   Paint paint = new Paint();
            paint.setStyle(Paint.Style.FILL);

            // make the entire canvas white
            paint.setColor(Color.WHITE);
            canvas.drawPaint(paint);
paint.setStrokeWidth(1);
            paint.setPathEffect(null);
            paint.setColor(Color.GRAY);
            paint.setAntiAlias(true);


            for (int i=1; i < 100; i++){
                canvas.drawLine(0, i*1 , 600, i*20, paint);
                canvas.drawLine(i*1 ,0, i*20, 600, paint);      
            }
}

解决方案

Within your view, you need to create the "OnTouchListener" which should look something like this:

myView.setOnTouchListener(new View.OnTouchListnener(){
    @Override
    public boolean onTouch(View v, MotionEvent e){
        switch(e.getAction()){
        case MotionEvent.ACTION_DOWN:
        //and code will go here for putting the finger on the screen

I would have a look at MotionEvent and looking at the various levels. You'll want to pay attention to how it can pack several bits of movement information into one MotionEvent.

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