android - 如何在 Android 中发送指针事件

Question

我正在尝试检测 Android 中的虚拟键盘高度。

我发现了一个类似的主题:Get the height of virtual keyboard in Android

看来作者找到了检测高度的方法:

I found a way to get it. After I request to open virtual keyboard, I send pointer event that I generate. their y coordinate starts from height of device and decreases.

我不知道该怎么做。

Answer 1

我将使用您发布的链接中提供的代码:

// Declare Variables

int softkeyboard_height = 0;
boolean calculated_keyboard_height;
Instrumentation instrumentation;

// Initialize instrumentation sometime before starting the thread
instrumentation = new Instrumentation();

mainScreenView 是您的基本 View ，您的 Activity View 。 m(ACTION_DOWN) 和 m1(ACTION_UP) 是使用 Instrumentation#sendPointerSync(MotionEvent) 调度的触摸事件。逻辑是调度到显示键盘的位置的 MotionEvent 将导致以下 SecurityException:

java.lang.SecurityException: Injecting to another application requires INJECT_EVENTS permission

因此，我们从屏幕底部开始，并在循环的每次迭代中向上(通过递减 y)。对于一定数量的迭代，我们将得到一个 SecurityException(我们将捕获):这意味着 MotionEvent 正在键盘上发生。当 y 变得足够小时(当它刚好在键盘上方时)，我们将跳出循环并使用以下方法计算键盘的高度:

softkeyboard_height = mainScreenView.getHeight() - y;

代码:

Thread t = new Thread(){
        public void run() {
            int y = mainScreenView.getHeight()-2;
            int x = 10;
            int counter = 0;
            int height = y;
            while (true){
                final MotionEvent m = MotionEvent.obtain(
                        SystemClock.uptimeMillis(),
                        SystemClock.uptimeMillis(),
                        MotionEvent.ACTION_DOWN,
                        x, 
                        y,
                        1);
                final MotionEvent m1 = MotionEvent.obtain(
                        SystemClock.uptimeMillis(),
                        SystemClock.uptimeMillis(),
                        MotionEvent.ACTION_UP,
                        x, 
                        y,
                        1);
                boolean pointer_on_softkeyboard = false;
                try {
                    instrumentation.sendPointerSync(m);
                    instrumentation.sendPointerSync(m1);
                } catch (SecurityException e) {
                    pointer_on_softkeyboard = true;
                }
                if (!pointer_on_softkeyboard){
                    if (y == height){
                        if (counter++ < 100){
                            Thread.yield();
                            continue;
                        }
                    } else if (y > 0){
                        softkeyboard_height = mainScreenView.getHeight() - y;
                        Log.i("", "Soft Keyboard's height is: " + softkeyboard_height);
                    }
                    break;
                }
                y--;

            }
            if (softkeyboard_height > 0 ){
                // it is calculated and saved in softkeyboard_height
            } else {
                calculated_keyboard_height = false;
            }
        }
    };
    t.start();

Instrumentation#sendPointerSync(MotionEvent):

Dispatch a pointer event. Finished at some point after the recipient has returned from its event processing, though it may not have completely finished reacting from the event -- for example, if it needs to update its display as a result, it may still be in the process of doing that.