Instrumentation模擬點選，拖拽，向系統傳送keycode。

需要注意的幾點：

1. Android系統座標系，X軸正方向為右，Y軸正方向為下（與數學座標系相反)
2. 所有事件在傳送時均需要在Thread中執行，否則會報異常。
3. 模擬輸入法種特殊符號時，需要帶上shift，同正常鍵盤操作。

public void simulateClick() {

        final float clickX = mPositionX + mHalfScreenWidth;
        final float clickY = mPositionY + mHalfScreenHeight;

        long
 
 downTime = SystemClock.uptimeMillis();
        inst.sendPointerSync(MotionEvent.obtain(downTime, downTime + 100, MotionEvent.ACTION_DOWN, clickX, clickY, 0));
        inst.sendPointerSync(MotionEvent.obtain(downTime, downTime + 100, MotionEvent.ACTION_UP, clickX, clickY, 0));

    }

 public void simulateTouch
 
(int event, float x, float y) {

        mPositionX += x;
        mPositionY += y;


        if (mPositionX > mHalfScreenWidth) {
            mPositionX = mHalfScreenWidth;
        } else if (mPositionX < (-mHalfScreenWidth)) {
            mPositionX = -mHalfScreenWidth;
        }

        if (mPositionY > mHalfScreenHeight) {
            mPositionY = mHalfScreenHeight;
        } else
 
 if (mPositionY < (-mHalfScreenHeight)) {
            mPositionY = -mHalfScreenHeight;
        }


        float moveX = mPositionX + mHalfScreenWidth;
        float moveY = mPositionY + mHalfScreenHeight;

        long downTime = SystemClock.uptimeMillis();
        MotionEvent motionEvent = MotionEvent.obtain(downTime, downTime + 100, event, moveX, moveY, 0);

        try {
            inst.sendPointerSync(motionEvent);
        } catch (Exception e) {
            e.printStackTrace();
            Log.e(TAG, "Exception = " + e);
        }

    }

private static boolean simulateKeystroke(int KeyCode) {

        try {
            Instrumentation inst = new Instrumentation();

            if (shift) {
                inst.sendKeySync(new KeyEvent(0, 0, KeyEvent.ACTION_DOWN, KeyCode, 0, KeyEvent.META_SHIFT_ON));
                inst.sendKeySync(new KeyEvent(0, 0, KeyEvent.ACTION_UP, KeyCode, 0, KeyEvent.META_SHIFT_ON));
                //  shift = false;
            } else {
                inst.sendKeyDownUpSync(KeyCode);
            }

            return true;
        } catch (Exception e) {
            // TODO: handle exception
            return false;
        }
    }

Android 裝置啟動後，會預設為Touch模式。如果你做過Android TV開發，發現開機後launcher的焦點丟失，或者有異常情況。請參考如下程式碼。

   Instrumentation instrumentation = new Instrumentation();
        instrumentation.setInTouchMode(false);