Question

在我的应用程序中，我希望以这种方式在同一视图中管理许多内容：

我想获得在这个视图上方的确切手指数，也就是说，如果我的手指总是应该是1，如果我躺下第二根手指，则总数应为2，等等为3,4， 5 ...（直到我的设备支持其最大触摸次数）。没关系但是如果我从屏幕上移开一根手指，也就是说，如果我在屏幕上放置两根手指，那么我实时也想要总数，那么总数是2，但是如果我移开一根手指，那么总应该是变成了1。

我创建了这段代码，但它没有正常工作。

touch_view = (View)findViewById(R.id.touch_view);

        touch_view.setOnTouchListener(new OnTouchListener() {

            @Override
            public boolean onTouch(View v, MotionEvent event) {

                int action = event.getAction();

                if (action == MotionEvent.ACTION_DOWN ){

                    touches++;
                    Log.i("", "touches "+ touches);
                    Log.i("", "action down");

                }
                else if (action == MotionEvent.ACTION_POINTER_DOWN){
                    touches++;
                    Log.i("", "touches "+ touches);
                    Log.i("", "pointer down");
                }
                else if (action == MotionEvent.ACTION_POINTER_UP){
                    touches--;
                    Log.i("", "touches " + touches);
                    Log.i("", "pointer up");
                }
                else if (action == MotionEvent.ACTION_UP){

                    touches--;
                    Log.i("", "touches " + touches);
                    Log.i("", "action up");
                }
                else if (action == MotionEvent.ACTION_CANCEL){

                    Log.i("", "cancel");
                }
                else if (action == MotionEvent.ACTION_HOVER_ENTER){

                    Log.i("", "action over enter");
                }
                else if (action == MotionEvent.ACTION_HOVER_EXIT){

                    Log.i("", "action over exit");
                }
                else if (action == MotionEvent.ACTION_OUTSIDE){

                    Log.i("", "action outside");
                }
                else if (action == MotionEvent.ACTION_POINTER_INDEX_MASK){

                    Log.i("", "index mask");
                }

                if (action != MotionEvent.ACTION_MOVE){
                    Log.i("","pointer count"+event.getPointerCount());
                    Log.i("","action type" +event.getAction());
                }

我注意到我的计数＆＃34;接触＆＃34;不能很好地工作......有时我的日志＆＃34; event.getAction（）＆＃34;给我一个奇怪的数字（261,262 ... 517,518 ......）这些数字是什么类型的动作？你能救我吗？

Answer 1

我的解决方案

touch_view.setOnTouchListener(new OnTouchListener() {

            @Override
            public boolean onTouch(View v, MotionEvent event) {

                int action = event.getAction();

                if (action != MotionEvent.ACTION_MOVE){

                    if (action == MotionEvent.ACTION_DOWN ){

                        current_touches = 1;
                        Log.i("", "current touches " + current_touches);
                    }
                    else if (action == MotionEvent.ACTION_UP){

                        current_touches = 0;
                        Log.i("", "current touches " + current_touches);
                    }

                    else{

                        int action_code = event.getAction();

                        if (action_code%2 == 0){

                            if (current_touches != 0)
                                current_touches--;
                        }
                        else
                            current_touches++;

                        Log.i("", "current touches " + current_touches);


                    }
                }

                return true;
            }
        });

Android：在一般视图中管理更多内容

1 个答案: