MyPrintService.java revision e816e2521562fc5c117653f041e765484f79f2e7 
1/*
2 * Copyright (C) 2013 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 *      http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17package foo.bar.printservice;
18
19import android.content.Intent;
20import android.net.Uri;
21import android.os.AsyncTask;
22import android.os.Handler;
23import android.os.Looper;
24import android.os.Message;
25import android.os.ParcelFileDescriptor;
26import android.print.PrintAttributes;
27import android.print.PrintAttributes.Margins;
28import android.print.PrintAttributes.MediaSize;
29import android.print.PrintAttributes.Resolution;
30import android.print.PrintJobInfo;
31import android.print.PrinterCapabilitiesInfo;
32import android.print.PrinterId;
33import android.print.PrinterInfo;
34import android.printservice.PrintJob;
35import android.printservice.PrintService;
36import android.printservice.PrinterDiscoverySession;
37import android.util.Log;
38import android.util.SparseArray;
39
40import java.io.BufferedInputStream;
41import java.io.BufferedOutputStream;
42import java.io.File;
43import java.io.FileInputStream;
44import java.io.FileOutputStream;
45import java.io.IOException;
46import java.io.InputStream;
47import java.io.OutputStream;
48import java.util.ArrayList;
49import java.util.List;
50
51public class MyPrintService extends PrintService {
52
53    private static final String LOG_TAG = "MyPrintService";
54
55    private static final long STANDARD_DELAY_MILLIS = 10000;
56
57    static final String INTENT_EXTRA_ACTION_TYPE = "INTENT_EXTRA_ACTION_TYPE";
58    static final String INTENT_EXTRA_PRINT_JOB_ID = "INTENT_EXTRA_PRINT_JOB_ID";
59
60    static final int ACTION_TYPE_ON_PRINT_JOB_PENDING = 1;
61    static final int ACTION_TYPE_ON_REQUEST_CANCEL_PRINT_JOB = 2;
62
63    private static final Object sLock = new Object();
64
65    private static MyPrintService sInstance;
66
67    private Handler mHandler;
68
69    private AsyncTask<ParcelFileDescriptor, Void, Void> mFakePrintTask;
70
71    private FakePrinterDiscoverySession mSession;
72
73    private final SparseArray<PrintJob> mProcessedPrintJobs = new SparseArray<PrintJob>();
74
75    public static MyPrintService peekInstance() {
76        synchronized (sLock) {
77            return sInstance;
78        }
79    }
80
81    @Override
82    protected void onConnected() {
83        Log.i(LOG_TAG, "#onConnected()");
84        mHandler = new MyHandler(getMainLooper());
85        synchronized (sLock) {
86            sInstance = this;
87        }
88    }
89
90    @Override
91    protected void onDisconnected() {
92        Log.i(LOG_TAG, "#onDisconnected()");
93        if (mSession != null) {
94            mSession.cancellAddingFakePrinters();
95        }
96        synchronized (sLock) {
97            sInstance = null;
98        }
99    }
100
101    @Override
102    protected PrinterDiscoverySession onCreatePrinterDiscoverySession() {
103        Log.i(LOG_TAG, "#onCreatePrinterDiscoverySession()");
104        return new FakePrinterDiscoverySession();
105    }
106
107    @Override
108    protected void onRequestCancelPrintJob(final PrintJob printJob) {
109        Log.i(LOG_TAG, "#onRequestCancelPrintJob()");
110        mProcessedPrintJobs.put(printJob.getId(), printJob);
111        Intent intent = new Intent(this, MyDialogActivity.class);
112        intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
113        intent.putExtra(INTENT_EXTRA_PRINT_JOB_ID, printJob.getId());
114        intent.putExtra(INTENT_EXTRA_ACTION_TYPE, ACTION_TYPE_ON_REQUEST_CANCEL_PRINT_JOB);
115        startActivity(intent);
116    }
117
118    @Override
119    public void onPrintJobQueued(final PrintJob printJob) {
120        Log.i(LOG_TAG, "#onPrintJobQueued()");
121        mProcessedPrintJobs.put(printJob.getId(), printJob);
122        if (printJob.isQueued()) {
123            printJob.start();
124        }
125        Intent intent = new Intent(this, MyDialogActivity.class);
126        intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
127        intent.putExtra(INTENT_EXTRA_PRINT_JOB_ID, printJob.getId());
128        intent.putExtra(INTENT_EXTRA_ACTION_TYPE, ACTION_TYPE_ON_PRINT_JOB_PENDING);
129        startActivity(intent);
130    }
131
132    void handleRequestCancelPrintJob(int printJobId) {
133        PrintJob printJob = mProcessedPrintJobs.get(printJobId);
134        if (printJob == null) {
135            return;
136        }
137        mProcessedPrintJobs.remove(printJobId);
138        if (printJob.isQueued() || printJob.isStarted()) {
139            mHandler.removeMessages(MyHandler.MSG_HANDLE_DO_PRINT_JOB);
140            mHandler.removeMessages(MyHandler.MSG_HANDLE_FAIL_PRINT_JOB);
141            printJob.cancel();
142        }
143    }
144
145    void handleFailPrintJobDelayed(int printJobId) {
146        Message message = mHandler.obtainMessage(
147                MyHandler.MSG_HANDLE_FAIL_PRINT_JOB, printJobId, 0);
148        mHandler.sendMessageDelayed(message, STANDARD_DELAY_MILLIS);
149    }
150
151    void handleFailPrintJob(int printJobId) {
152        PrintJob printJob = mProcessedPrintJobs.get(printJobId);
153        if (printJob == null) {
154            return;
155        }
156        mProcessedPrintJobs.remove(printJobId);
157        if (printJob.isQueued() || printJob.isStarted()) {
158            printJob.fail(getString(R.string.fail_reason));
159        }
160    }
161
162    void handleBlockPrintJobDelayed(int printJobId) {
163        Message message = mHandler.obtainMessage(
164                MyHandler.MSG_HANDLE_BLOCK_PRINT_JOB, printJobId, 0);
165        mHandler.sendMessageDelayed(message, STANDARD_DELAY_MILLIS);
166    }
167
168    void handleBlockPrintJob(int printJobId) {
169        final PrintJob printJob = mProcessedPrintJobs.get(printJobId);
170        if (printJob == null) {
171            return;
172        }
173
174        if (printJob.isStarted()) {
175            printJob.block("Gimme some reset, dude");
176        }
177    }
178
179    void handleBlockAndDelayedUnblockPrintJob(int printJobId) {
180        handleBlockPrintJob(printJobId);
181
182        Message message = mHandler.obtainMessage(
183                MyHandler.MSG_HANDLE_UNBLOCK_PRINT_JOB, printJobId, 0);
184        mHandler.sendMessageDelayed(message, STANDARD_DELAY_MILLIS);
185    }
186
187    void handleUnblockPrintJob(int printJobId) {
188        final PrintJob printJob = mProcessedPrintJobs.get(printJobId);
189        if (printJob == null) {
190            return;
191        }
192
193        if (printJob.isBlocked()) {
194            printJob.start();
195        }
196    }
197
198    void handleQueuedPrintJobDelayed(int printJobId) {
199        final PrintJob printJob = mProcessedPrintJobs.get(printJobId);
200        if (printJob == null) {
201            return;
202        }
203
204        if (printJob.isQueued()) {
205            printJob.start();
206        }
207        Message message = mHandler.obtainMessage(
208                MyHandler.MSG_HANDLE_DO_PRINT_JOB, printJobId, 0);
209        mHandler.sendMessageDelayed(message, STANDARD_DELAY_MILLIS);
210    }
211
212    void handleQueuedPrintJob(int printJobId) {
213        final PrintJob printJob = mProcessedPrintJobs.get(printJobId);
214        if (printJob == null) {
215            return;
216        }
217
218        if (printJob.isQueued()) {
219            printJob.start();
220        }
221
222        final PrintJobInfo info = printJob.getInfo();
223        final File file = new File(getFilesDir(), info.getLabel() + ".pdf");
224
225        mFakePrintTask = new AsyncTask<ParcelFileDescriptor, Void, Void>() {
226            @Override
227            protected Void doInBackground(ParcelFileDescriptor... params) {
228                InputStream in = new BufferedInputStream(new FileInputStream(
229                        params[0].getFileDescriptor()));
230                OutputStream out = null;
231                try {
232                    out = new BufferedOutputStream(new FileOutputStream(file));
233                    final byte[] buffer = new byte[8192];
234                    while (true) {
235                        if (isCancelled()) {
236                            break;
237                        }
238                        final int readByteCount = in.read(buffer);
239                        if (readByteCount < 0) {
240                            break;
241                        }
242                        out.write(buffer, 0, readByteCount);
243                    }
244                } catch (IOException ioe) {
245                    throw new RuntimeException(ioe);
246                } finally {
247                    if (in != null) {
248                        try {
249                            in.close();
250                        } catch (IOException ioe) {
251                            /* ignore */
252                        }
253                    }
254                    if (out != null) {
255                        try {
256                            out.close();
257                        } catch (IOException ioe) {
258                            /* ignore */
259                        }
260                    }
261                    if (isCancelled()) {
262                        file.delete();
263                    }
264                }
265                return null;
266            }
267
268            @Override
269            protected void onPostExecute(Void result) {
270                if (printJob.isStarted()) {
271                    printJob.complete();
272                }
273
274                file.setReadable(true, false);
275
276                // Quick and dirty to show the file - use a content provider instead.
277                Intent intent = new Intent(Intent.ACTION_VIEW);
278                intent.setDataAndType(Uri.fromFile(file), "application/pdf");
279                intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
280                startActivity(intent, null);
281
282                mFakePrintTask = null;
283            }
284
285            @Override
286            protected void onCancelled(Void result) {
287                if (printJob.isStarted()) {
288                    printJob.cancel();
289                }
290            }
291        };
292        mFakePrintTask.executeOnExecutor(AsyncTask.SERIAL_EXECUTOR,
293                printJob.getDocument().getData());
294    }
295
296    private final class MyHandler extends Handler {
297        public static final int MSG_HANDLE_DO_PRINT_JOB = 1;
298        public static final int MSG_HANDLE_FAIL_PRINT_JOB = 2;
299        public static final int MSG_HANDLE_BLOCK_PRINT_JOB = 3;
300        public static final int MSG_HANDLE_UNBLOCK_PRINT_JOB = 4;
301
302        public MyHandler(Looper looper) {
303            super(looper);
304        }
305
306        @Override
307        public void handleMessage(Message message) {
308            switch (message.what) {
309                case MSG_HANDLE_DO_PRINT_JOB: {
310                    final int printJobId = message.arg1;
311                    handleQueuedPrintJob(printJobId);
312                } break;
313
314                case MSG_HANDLE_FAIL_PRINT_JOB: {
315                    final int printJobId = message.arg1;
316                    handleFailPrintJob(printJobId);
317                } break;
318
319                case MSG_HANDLE_BLOCK_PRINT_JOB: {
320                    final int printJobId = message.arg1;
321                    handleBlockPrintJob(printJobId);
322                } break;
323
324                case MSG_HANDLE_UNBLOCK_PRINT_JOB: {
325                    final int printJobId = message.arg1;
326                    handleUnblockPrintJob(printJobId);
327                } break;
328            }
329        }
330    }
331
332    private final class FakePrinterDiscoverySession extends  PrinterDiscoverySession {
333        private final Handler mSesionHandler = new SessionHandler(getMainLooper());
334
335        private final List<PrinterInfo> mFakePrinters = new ArrayList<PrinterInfo>();
336
337        public FakePrinterDiscoverySession() {
338            for (int i = 0; i < 1000; i++) {
339                String name = "Printer " + i;
340                PrinterInfo printer = new PrinterInfo
341                        .Builder(generatePrinterId(name), name, PrinterInfo.STATUS_IDLE)
342                        .create();
343                mFakePrinters.add(printer);
344            }
345        }
346
347        @Override
348        public void onDestroy() {
349            Log.i(LOG_TAG, "FakePrinterDiscoverySession#onDestroy()");
350            mSesionHandler.removeMessages(SessionHandler.MSG_ADD_FIRST_BATCH_FAKE_PRINTERS);
351            mSesionHandler.removeMessages(SessionHandler.MSG_ADD_SECOND_BATCH_FAKE_PRINTERS);
352        }
353
354        @Override
355        public void onStartPrinterDiscovery(List<PrinterId> priorityList) {
356            Log.i(LOG_TAG, "FakePrinterDiscoverySession#onStartPrinterDiscovery()");
357            Message message1 = mSesionHandler.obtainMessage(
358                    SessionHandler.MSG_ADD_FIRST_BATCH_FAKE_PRINTERS, this);
359            mSesionHandler.sendMessageDelayed(message1, 0);
360
361            Message message2 = mSesionHandler.obtainMessage(
362                    SessionHandler.MSG_ADD_SECOND_BATCH_FAKE_PRINTERS, this);
363            mSesionHandler.sendMessageDelayed(message2, 10000);
364        }
365
366        @Override
367        public void onStopPrinterDiscovery() {
368            Log.i(LOG_TAG, "FakePrinterDiscoverySession#onStopPrinterDiscovery()");
369            cancellAddingFakePrinters();
370        }
371
372        @Override
373        public void onStartPrinterStateTracking(PrinterId printerId) {
374            Log.i(LOG_TAG, "FakePrinterDiscoverySession#onStartPrinterStateTracking()");
375            PrinterInfo printer = findPrinterInfo(printerId);
376            if (printer != null) {
377                PrinterCapabilitiesInfo capabilities =
378                        new PrinterCapabilitiesInfo.Builder(printerId)
379                    .setMinMargins(new Margins(0, 0, 0, 0), new Margins(0, 0, 0, 0))
380                    .addMediaSize(MediaSize.ISO_A4, true)
381                    .addMediaSize(MediaSize.ISO_A5, false)
382                    .addResolution(new Resolution("R1", getString(
383                            R.string.resolution_200x200), 200, 200), false)
384                    .addResolution(new Resolution("R2", getString(
385                            R.string.resolution_300x300), 300, 300), true)
386                    .setColorModes(PrintAttributes.COLOR_MODE_COLOR
387                            | PrintAttributes.COLOR_MODE_MONOCHROME,
388                            PrintAttributes.COLOR_MODE_MONOCHROME)
389                    .create();
390
391                printer = new PrinterInfo.Builder(printer)
392                    .setCapabilities(capabilities)
393                    .create();
394
395                List<PrinterInfo> printers = new ArrayList<PrinterInfo>();
396                printers.add(printer);
397                addPrinters(printers);
398            }
399        }
400
401        @Override
402        public void onValidatePrinters(List<PrinterId> printerIds) {
403            Log.i(LOG_TAG, "FakePrinterDiscoverySession#onValidatePrinters()");
404        }
405
406        @Override
407        public void onStopPrinterStateTracking(PrinterId printerId) {
408            Log.i(LOG_TAG, "FakePrinterDiscoverySession#onStopPrinterStateTracking()");
409        }
410
411        private void addFirstBatchFakePrinters() {
412            List<PrinterInfo> printers = mFakePrinters.subList(0, mFakePrinters.size() / 2);
413            addPrinters(printers);
414        }
415
416        private void addSecondBatchFakePrinters() {
417            List<PrinterInfo> printers = mFakePrinters.subList(mFakePrinters.size() / 2,
418                    mFakePrinters.size());
419            addPrinters(printers);
420        }
421
422        private PrinterInfo findPrinterInfo(PrinterId printerId) {
423            List<PrinterInfo> printers = getPrinters();
424            final int printerCount = getPrinters().size();
425            for (int i = 0; i < printerCount; i++) {
426                PrinterInfo printer = printers.get(i);
427                if (printer.getId().equals(printerId)) {
428                    return printer;
429                }
430            }
431            return null;
432        }
433
434        private void cancellAddingFakePrinters() {
435            mSesionHandler.removeMessages(SessionHandler.MSG_ADD_FIRST_BATCH_FAKE_PRINTERS);
436            mSesionHandler.removeMessages(SessionHandler.MSG_ADD_SECOND_BATCH_FAKE_PRINTERS);
437        }
438
439        final class SessionHandler extends Handler {
440            public static final int MSG_ADD_FIRST_BATCH_FAKE_PRINTERS = 1;
441            public static final int MSG_ADD_SECOND_BATCH_FAKE_PRINTERS = 2;
442
443            public SessionHandler(Looper looper) {
444                super(looper);
445            }
446
447            @Override
448            public void handleMessage(Message message) {
449                switch (message.what) {
450                    case MSG_ADD_FIRST_BATCH_FAKE_PRINTERS: {
451                        addFirstBatchFakePrinters();
452                    } break;
453
454                    case MSG_ADD_SECOND_BATCH_FAKE_PRINTERS: {
455                        addSecondBatchFakePrinters();
456                    } break;
457                }
458            }
459        }
460    }
461}
462