[Android] Generating multitouch MotionEvents for testing

For testing the behaviour of the GestureDetector, i want to send MotionEvents to check action result.


Above android 2.3 we can use the method 'obtain' to get multitouch event.

public static MotionEvent obtain (long downTime, long eventTime, int action, int pointers, int[] pointerIds, PointerCoords[] pointerCoords, int metaState, float xPrecision, float yPrecision, int deviceId, int edgeFlags, int source, int flags)

            //action is an int variable indicate what event type to send. (DOWN, UP, POINIT_DOWN....)

            //point is an PointF array to indecate all coordinates touch on screen.

            int[] pointCoordsID = new int[point.length];

            PointerCoords[] pointCoords = new PointerCoords[point.length];

            for (int i = 0; i < point.length; i++) 

            {

                pointerIds[i] = i;

                pointerCoords[i] = new PointerCoords();

                pointerCoords[i].x = point[i].x;

                pointerCoords[i].y = point[i].y;

            }            

            long downTime = SystemClock.uptimeMillis();

            long eventTime = SystemClock.uptimeMillis();

            MotionEvent event = MotionEvent.obtain(downTime, eventTime, action, point.lenth, pointCoordsID, pointCoords, 0, 1, 1, 0, 0, 0, 0);



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If your device or sdk is android 2.2 or lower, you have to create MotionEvent from Parcel as below to perform it.


            //action is an int variable indicate what event type to send. (DOWN, UP, POINIT_DOWN....)
            //point is an PointF array to indecate all coordinates touch on screen.

            Parcel inParcel = Parcel.obtain();

            long downTime = SystemClock.uptimeMillis();
            long eventTime = SystemClock.uptimeMillis();
            inParcel.writeLong(downTime); //DownTime
            inParcel.writeLong(eventTime); //EventTime
            inParcel.writeInt(action);         //Action
            inParcel.writeInt(0);         //MetaState
            inParcel.writeFloat(point[0].x); //RawX
            inParcel.writeFloat(point[0].y); //RawY
            final int NP = m_point.length; //NumPointers
            inParcel.writeInt(NP);
            final int NS = m_point.length; //NumSamples
            inParcel.writeInt(NS);
            final int NI = NP*NS;
            if (NI > 0) 
            {
                int i;               
                //set point index
                for (i=0; i<NP; i++) 
                {
                inParcel.writeInt(i);
                }
                // set location, pressure, size for each sampleData
                int NUM_SAMPLE_DATA = 4;
                final int ND = NI*NUM_SAMPLE_DATA;
                float[] history = new float[ND];;
                for (i = 0; i < m_point.length; i++) 
                {
                history[i*NUM_SAMPLE_DATA] = point[i].x;
                history[i*NUM_SAMPLE_DATA + 1] = point[i].y;
                history[i*NUM_SAMPLE_DATA + 2] = 0;
                history[i*NUM_SAMPLE_DATA + 3] = 0;
                }
                for (i=0; i<ND; i++) 
                {
                inParcel.writeFloat(history[i]);
                }
                // set event time for each sampleData
                for (i=0; i<NS; i++) 
                {
                inParcel.writeLong(eventTime);
                }
            }
            inParcel.writeFloat(1); //PrecisionX
            inParcel.writeFloat(1); //PrecisionY
            inParcel.writeInt(0); //DeviceID
            inParcel.writeInt(0); //EdgeFlags
            
            inParcel.setDataPosition(0);
            
            MotionEvent event = MotionEvent.CREATOR.createFromParcel(inParcel);


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Reference:
http://stackoverflow.com/questions/3637044/generating-multitouch-motionevents-for-testing