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Putting Android to work in a field service application
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The UI at this point is only partially set up; we need a means to capture a signature on the screen of our Android device. The next listing implements the class closejobView, which is an extension of the View class.
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Listing 12.17 CloseJob.java closejobView class
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public class closejobView extends View { closejobView Bitmap _bitmap; Required extends base Canvas _canvas; classes for class View drawing final Paint _paint; int lastX; int lastY; Initialize public closejobView(Context c) { drawing super(c); classes _paint = new Paint(); _paint.setColor(Color.BLACK); lastX = -1; Save method Add } persists contextual signature public boolean Save(OutputStream os){ data to try { image _canvas.drawText("Unlocking Android", 10, 10, _paint); _canvas.drawText("http://manning.com/ableson", 10, 25, _paint); _canvas.drawText("http://android12.msi-wireless.com", 10, 40, _paint); _bitmap.compress(Bitmap.CompressFormat.JPEG, 100, os); invalidate(); return true; } catch (Exception e) { return false; } } @Override protected void onSizeChanged(int w, int h, int oldw, int oldh) { Bitmap img = Bitmap.createBitmap(w, h,Bitmap.Config.ARGB_8888); Canvas canvas = new Canvas(); canvas.setBitmap(img); if (_bitmap != null) { canvas.drawBitmap(img, 0, 0, null); } _bitmap = img; _canvas = canvas; _canvas.drawColor(Color.WHITE); } @Override protected void onDraw(Canvas canvas) { Draw image if (_bitmap != null) { on screen canvas.drawBitmap(_bitmap, 0, 0, null); } } Handle touch @Override events public boolean onTouchEvent(MotionEvent event) { int action = event.getAction(); int X = (int)event.getX(); int Y = (int)event.getY();
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switch (action ) { case MotionEvent.ACTION_UP: // reset location lastX = -1; break; case MotionEvent.ACTION_DOWN: if (lastX != -1){ if ((int) event.getX() != lastX) { _canvas.drawLine(lastX, lastY, X, Y, _paint); } } lastX = (int)event.getX(); lastY = (int)event.getY(); break; case MotionEvent.ACTION_MOVE: if (lastX != -1){ _canvas.drawLine(lastX, lastY, X, Y, _paint); } lastX = (int)event.getX(); lastY = (int)event.getY(); break; } invalidate(); return true; } } }
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The closejobView extends the base View class B. The Bitmap and Canvas classes c work together to form the drawing surface for this Activity. Note the call to the Canvas.drawColor method, which sets the background color to white. When the onDraw() method is invoked, the canvas draws its associated bitmap with a call to drawBitmap() f. The logic for where to draw relies on the onTouchEvent method g, which receives an instance of the MotionEvent class. The MotionEvent class tells what happened and where. ACTION_UP, ACTION_DOWN, and ACTION_MOVE are the events captured, with some logic to guide when and where to draw. Once the signature is complete, the Save method d is responsible for converting the contents of the image to a form usable for submission to the server. Note that additional text is drawn on the signature e. In this case, it s little more than a shameless plug for this book s web page, but this could also be location-based data. Why is this important Imagine someone forging a signature. It could happen, but it would be more challenging and of less value to a rogue mobile technician if the GPS/location data were stamped on the job, along with the date and time. When converting the image to our desired JPEG format, there s an additional input argument to this method an OutputStream, used to store the image data. This OutputStream reference was an input argument to the Save method. Now that the UI has been created and a signature drawn on the screen, let s look at the code used to close the job. Closing the job involves capturing the signature and sending it to the server via an HTTP POST. The class DoCloseJob is shown in the following listing.
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Listing 12.18 CloseJob.java DoCloseJob class
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class DoCloseJob implements Runnable { Constructor uses Prefs _myprefs; Prefs instance DoCloseJob(Prefs p) { _myprefs = p; } public void run() { Open file for try { storing FileOutputStream os = signature getApplication().openFileOutput("sig.jpg", 0); sc.Save(os); os.flush(); os.close(); // reopen to so we can send this data to server File f = new File(getApplication().getFileStreamPath("sig.jpg").toString()); long flength = f.length(); FileInputStream is = getApplication().openFileInput("sig.jpg"); byte data[] = new byte[(int) flength]; int count = is.read(data); if (count != (int) flength) { // bad read } msg = new Message(); msg.what = 0; msg.obj = (Object)("Connecting to Server"); Construct progresshandler.sendMessage(msg); storage URL url = new URL(_myprefs.getServer() + URL "/closejob.php jobid=" + je.get_jobid()); URLConnection conn = url.openConnection(); conn.setDoOutput(true); BufferedOutputStream wr = new BufferedOutputStream(conn.getOutputStream()); Write data wr.write(data); to server wr.flush(); wr.close(); msg = new Message(); msg.what = 0; msg.obj = (Object)("Data Sent"); progresshandler.sendMessage(msg); Read server BufferedReader rd = new BufferedReader(new response InputStreamReader(conn.getInputStream())); String line = ""; Check for Boolean bSuccess = false; successful while ((line = rd.readLine()) != null) { processing if (line.indexOf("SUCCESS") != -1) { bSuccess = true; } } wr.close(); rd.close(); if (bSuccess) { msg = new Message();
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