Android自動化測試中實現長按并拖動

    android應用自動化過程中，會遇見需要長按并拖動的場景，例如類似UC瀏覽器中，長按某個導航中的圖標，使其處于可移動狀態，然后再將其移動到另一 個地方，與其它導航圖標換個位置，在robotium中有個drag(float fromX, float toX, float fromY, float toY,int stepCount)方法，但由于drag沒有長按這個步驟，因此不能使應用處于可移動的狀態，是沒法完成這樣的常見而簡單的操作的。

drag方法源碼實現如下：

    public void drag(float fromX, float toX, float fromY, float toY,  
            int stepCount) {  
        long downTime = SystemClock.uptimeMillis();  
        long eventTime = SystemClock.uptimeMillis();  
        float y = fromY;  
        float x = fromX;  
        float yStep = (toY - fromY) / stepCount;  
        float xStep = (toX - fromX) / stepCount;  
        MotionEvent event = MotionEvent.obtain(downTime, eventTime,MotionEvent.ACTION_DOWN, fromX, fromY, 0);  
        try {  
            inst.sendPointerSync(event);  
        } catch (SecurityException ignored) {}  
        for (int i = 0; i < stepCount; ++i) {  
            y += yStep;  
            x += xStep;  
            eventTime = SystemClock.uptimeMillis();  
            event = MotionEvent.obtain(downTime, eventTime,MotionEvent.ACTION_MOVE, x, y, 0);  
            try {  
                inst.sendPointerSync(event);  
            } catch (SecurityException ignored) {}  
        }  
        eventTime = SystemClock.uptimeMillis();  
        event = MotionEvent.obtain(downTime, eventTime, MotionEvent.ACTION_UP,toX, toY, 0);  
        try {  
            inst.sendPointerSync(event);  
        } catch (SecurityException ignored) {}  
    }  

可以看出其實是通過MotionEvent的ACTION_DOWN模擬屏幕按下操 作，ACTION_MOVE模擬手勢在屏幕上滑動，ACTION_UP模擬手勢離開屏幕，從而完成整個拖動過程，而且其實robotium中的各種點擊類 方法也都是通過模擬不同的手勢完成的。

因此要想完成長按并拖動的操作，只要在ACTION_DOWN之后，停留一段時間即可模擬長按操作。

    /**


     * 實現將一個視圖拖動到另一個視圖所在的位置 
     * @param viewFrom   起始View 
     * @param viewTo     終點View 
     * @throws Exception 
     */  
    public void clickLongAndDrag(View viewFrom,View viewTo) throws Exception {  
        //獲得視圖View中手機屏幕上的絕對x、y坐標  
        final int[] location = new int[2];    
        final int[] location2 = new int[2];   
        viewFrom.getLocationOnScreen(location);  
        viewTo.getLocationOnScreen(location2);  

        float xStart=location[0];  
        float yStart=location[1];  

        float xStop=location2[0];  
        float yStop=location2[1];  
        Log.i(TAG, "xStart:"+String.valueOf(xStart));  
        Log.i(TAG, "yStart:"+String.valueOf(yStart));  
        Log.i(TAG, "xStop:"+String.valueOf(xStop));  
        Log.i(TAG, "yStop:"+String.valueOf(yStop));  

        long downTime = SystemClock.uptimeMillis();  
        long eventTime = SystemClock.uptimeMillis();  

        try{  
            MotionEvent event = MotionEvent.obtain(downTime, eventTime, MotionEvent.ACTION_DOWN, xStart+10f, yStart+10f, 0);  
            inst.sendPointerSync(event);  
            //event = MotionEvent.obtain(downTime, eventTime, MotionEvent.ACTION_MOVE, xStart+10f+1.0f, yStart+10f+1.0f, 0);  
            //inst.sendPointerSync(event);  
            //Thread.sleep(1000);  
            //延遲一秒，模擬長按操作  
            eventTime = SystemClock.uptimeMillis() + 1000;  
            //xStop加了10點坐標，獲得的View坐標需根據應用實際情況稍做一點調整  
            event = MotionEvent.obtain(downTime, eventTime, MotionEvent.ACTION_MOVE, xStop+10f, yStop+50f, 0);  
            inst.sendPointerSync(event);  
            eventTime = SystemClock.uptimeMillis() + 1000;  
            //又再小小移動了一次，不這么做的話可以無法激活被測應用狀態，導致View移動后又回復到原來位置  
            event = MotionEvent.obtain(downTime, eventTime, MotionEvent.ACTION_MOVE, xStop+10f, yStop+10f, 0);  
            inst.sendPointerSync(event);  
            eventTime = SystemClock.uptimeMillis() + 1000;  
            event = MotionEvent.obtain(downTime, eventTime, MotionEvent.ACTION_UP, xStop+10f, yStop+10f, 0);  
            inst.sendPointerSync(event);  
        }catch (Exception ignored) {  
            // Handle exceptions if necessary  
            }  
    }  </pre>