MyPrintService.java revision 7ae2878f5219d55e842348eb44ffb5070b9d708d 
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.print.PrintAttributes;
26import android.print.PrintAttributes.Margins;
27import android.print.PrintAttributes.MediaSize;
28import android.print.PrintAttributes.Resolution;
29import android.print.PrintAttributes.Tray;
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.FileDescriptor;
44import java.io.FileInputStream;
45import java.io.FileOutputStream;
46import java.io.IOException;
47import java.io.InputStream;
48import java.io.OutputStream;
49import java.util.ArrayList;
50import java.util.List;
51
52import libcore.io.IoUtils;
53
54public class MyPrintService extends PrintService {
55
56    private static final String LOG_TAG = "MyPrintService";
57
58    private static final long STANDARD_DELAY_MILLIS = 10000;
59
60    static final String INTENT_EXTRA_ACTION_TYPE = "INTENT_EXTRA_ACTION_TYPE";
61    static final String INTENT_EXTRA_PRINT_JOB_ID = "INTENT_EXTRA_PRINT_JOB_ID";
62
63    static final int ACTION_TYPE_ON_PRINT_JOB_PENDING = 1;
64    static final int ACTION_TYPE_ON_REQUEST_CANCEL_PRINT_JOB = 2;
65
66    private static final Object sLock = new Object();
67
68    private static MyPrintService sInstance;
69
70    private Handler mHandler;
71
72    private AsyncTask<FileDescriptor, Void, Void> mFakePrintTask;
73
74    private FakePrinterDiscoverySession mSession;
75
76    private final SparseArray<PrintJob> mProcessedPrintJobs = new SparseArray<PrintJob>();
77
78    public static MyPrintService peekInstance() {
79        synchronized (sLock) {
80            return sInstance;
81        }
82    }
83
84    @Override
85    protected void onConnected() {
86        Log.i(LOG_TAG, "#onConnected()");
87        mHandler = new MyHandler(getMainLooper());
88        synchronized (sLock) {
89            sInstance = this;
90        }
91    }
92
93    @Override
94    protected void onDisconnected() {
95        Log.i(LOG_TAG, "#onDisconnected()");
96        if (mSession != null) {
97            mSession.cancellAddingFakePrinters();
98        }
99        synchronized (sLock) {
100            sInstance = null;
101        }
102    }
103
104    @Override
105    protected PrinterDiscoverySession onCreatePrinterDiscoverySession() {
106        Log.i(LOG_TAG, "#onCreatePrinterDiscoverySession()");
107        return new FakePrinterDiscoverySession();
108    }
109
110    @Override
111    protected void onRequestCancelPrintJob(final PrintJob printJob) {
112        Log.i(LOG_TAG, "#onRequestCancelPrintJob()");
113        mProcessedPrintJobs.put(printJob.getId(), printJob);
114        Intent intent = new Intent(this, MyDialogActivity.class);
115        intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
116        intent.putExtra(INTENT_EXTRA_PRINT_JOB_ID, printJob.getId());
117        intent.putExtra(INTENT_EXTRA_ACTION_TYPE, ACTION_TYPE_ON_REQUEST_CANCEL_PRINT_JOB);
118        startActivity(intent);
119    }
120
121    @Override
122    public void onPrintJobQueued(final PrintJob printJob) {
123        Log.i(LOG_TAG, "#onPrintJobQueued()");
124        mProcessedPrintJobs.put(printJob.getId(), printJob);
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 handleQueuedPrintJobDelayed(int printJobId) {
163        Message message = mHandler.obtainMessage(
164                MyHandler.MSG_HANDLE_DO_PRINT_JOB, printJobId, 0);
165        mHandler.sendMessageDelayed(message, STANDARD_DELAY_MILLIS);
166    }
167
168    void handleQueuedPrintJob(int printJobId) {
169        final PrintJob printJob = mProcessedPrintJobs.get(printJobId);
170        if (printJob == null) {
171            return;
172        }
173
174        if (printJob.isQueued()) {
175            printJob.start();
176        }
177
178        final PrintJobInfo info = printJob.getInfo();
179        final File file = new File(getFilesDir(), info.getLabel() + ".pdf");
180
181        mFakePrintTask = new AsyncTask<FileDescriptor, Void, Void>() {
182            @Override
183            protected Void doInBackground(FileDescriptor... params) {
184                InputStream in = new BufferedInputStream(new FileInputStream(params[0]));
185                OutputStream out = null;
186                try {
187                    out = new BufferedOutputStream(new FileOutputStream(file));
188                    final byte[] buffer = new byte[8192];
189                    while (true) {
190                        if (isCancelled()) {
191                            break;
192                        }
193                        final int readByteCount = in.read(buffer);
194                        if (readByteCount < 0) {
195                            break;
196                        }
197                        out.write(buffer, 0, readByteCount);
198                    }
199                } catch (IOException ioe) {
200                    throw new RuntimeException(ioe);
201                } finally {
202                    IoUtils.closeQuietly(in);
203                    IoUtils.closeQuietly(out);
204                    if (isCancelled()) {
205                        file.delete();
206                    }
207                }
208                return null;
209            }
210
211            @Override
212            protected void onPostExecute(Void result) {
213                if (printJob.isStarted()) {
214                    printJob.complete();
215                }
216
217                file.setReadable(true, false);
218
219                // Quick and dirty to show the file - use a content provider instead.
220                Intent intent = new Intent(Intent.ACTION_VIEW);
221                intent.setDataAndType(Uri.fromFile(file), "application/pdf");
222                intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
223                startActivity(intent, null);
224
225                mFakePrintTask = null;
226            }
227
228            @Override
229            protected void onCancelled(Void result) {
230                if (printJob.isStarted()) {
231                    printJob.cancel();
232                }
233            }
234        };
235        mFakePrintTask.executeOnExecutor(AsyncTask.SERIAL_EXECUTOR,
236                printJob.getDocument().getData());
237    }
238
239    private final class MyHandler extends Handler {
240        public static final int MSG_HANDLE_DO_PRINT_JOB = 1;
241        public static final int MSG_HANDLE_FAIL_PRINT_JOB = 2;
242
243        public MyHandler(Looper looper) {
244            super(looper, null, true);
245        }
246
247        @Override
248        public void handleMessage(Message message) {
249            switch (message.what) {
250                case MSG_HANDLE_DO_PRINT_JOB: {
251                    final int printJobId = message.arg1;
252                    handleQueuedPrintJob(printJobId);
253                } break;
254
255                case MSG_HANDLE_FAIL_PRINT_JOB: {
256                    final int printJobId = message.arg1;
257                    handleFailPrintJob(printJobId);
258                } break;
259            }
260        }
261    }
262
263    private final class FakePrinterDiscoverySession extends  PrinterDiscoverySession {
264        private final Handler mSesionHandler = new SessionHandler(getMainLooper());
265
266        private final List<PrinterInfo> mFakePrinters = new ArrayList<PrinterInfo>();
267
268        public FakePrinterDiscoverySession() {
269            for (int i = 0; i < 1000; i++) {
270                String printerName = "Printer " + i;
271                PrinterInfo printer = new PrinterInfo.Builder(generatePrinterId(printerName),
272                        printerName, PrinterInfo.STATUS_READY).create();
273                mFakePrinters.add(printer);
274            }
275        }
276
277        @Override
278        public void onDestroy() {
279            Log.i(LOG_TAG, "FakePrinterDiscoverySession#onDestroy()");
280            mSesionHandler.removeMessages(SessionHandler.MSG_ADD_FIRST_BATCH_FAKE_PRINTERS);
281            mSesionHandler.removeMessages(SessionHandler.MSG_ADD_SECOND_BATCH_FAKE_PRINTERS);
282        }
283
284        @Override
285        public void onStartPrinterDiscovery(List<PrinterId> priorityList) {
286            Log.i(LOG_TAG, "FakePrinterDiscoverySession#onStartPrinterDiscovery()");
287            Message message1 = mSesionHandler.obtainMessage(
288                    SessionHandler.MSG_ADD_FIRST_BATCH_FAKE_PRINTERS, this);
289            mSesionHandler.sendMessageDelayed(message1, 0);
290
291            Message message2 = mSesionHandler.obtainMessage(
292                    SessionHandler.MSG_ADD_SECOND_BATCH_FAKE_PRINTERS, this);
293            mSesionHandler.sendMessageDelayed(message2, 10000);
294        }
295
296        @Override
297        public void onStopPrinterDiscovery() {
298            Log.i(LOG_TAG, "FakePrinterDiscoverySession#onStopPrinterDiscovery()");
299            cancellAddingFakePrinters();
300        }
301
302        @Override
303        public void onRequestPrinterUpdate(PrinterId printerId) {
304            Log.i(LOG_TAG, "FakePrinterDiscoverySession#onRequestPrinterUpdate()");
305            PrinterInfo printer = findPrinterInfo(printerId);
306            if (printer != null) {
307                PrinterCapabilitiesInfo capabilities =
308                        new PrinterCapabilitiesInfo.Builder(printerId)
309                    .setMinMargins(new Margins(0, 0, 0, 0), new Margins(0, 0, 0, 0))
310                    .addMediaSize(MediaSize.createMediaSize(getPackageManager(),
311                            MediaSize.ISO_A4), true)
312                    .addMediaSize(MediaSize.createMediaSize(getPackageManager(),
313                            MediaSize.ISO_A5), false)
314                    .addResolution(new Resolution("R1", getString(
315                            R.string.resolution_200x200), 200, 200), true)
316                    .addResolution(new Resolution("R2", getString(
317                            R.string.resolution_300x300), 300, 300), false)
318                    .addInputTray(new Tray("FirstInputTray", getString(
319                            R.string.input_tray_first)), false)
320                    .addInputTray(new Tray("SecondInputTray", getString(
321                            R.string.input_tray_second)), true)
322                    .addOutputTray(new Tray("FirstOutputTray", getString(
323                            R.string.output_tray_first)), false)
324                    .addOutputTray(new Tray("SecondOutputTray",  getString(
325                            R.string.output_tray_second)), true)
326                    .setDuplexModes(PrintAttributes.DUPLEX_MODE_NONE
327                            | PrintAttributes.DUPLEX_MODE_LONG_EDGE
328                            | PrintAttributes.DUPLEX_MODE_SHORT_EDGE,
329                            PrintAttributes.DUPLEX_MODE_SHORT_EDGE)
330                    .setColorModes(PrintAttributes.COLOR_MODE_COLOR
331                            | PrintAttributes.COLOR_MODE_MONOCHROME,
332                            PrintAttributes.COLOR_MODE_MONOCHROME)
333                    .setFittingModes(PrintAttributes.FITTING_MODE_FIT_TO_PAGE
334                            | PrintAttributes.FITTING_MODE_NONE,
335                            PrintAttributes.FITTING_MODE_FIT_TO_PAGE)
336                    .setOrientations(PrintAttributes.ORIENTATION_PORTRAIT
337                            | PrintAttributes.ORIENTATION_LANDSCAPE,
338                            PrintAttributes.ORIENTATION_LANDSCAPE)
339                    .create();
340
341                printer = new PrinterInfo.Builder(printer)
342                    .setCapabilities(capabilities)
343                    .create();
344
345                List<PrinterInfo> printers = new ArrayList<PrinterInfo>();
346                printers.add(printer);
347                updatePrinters(printers);
348            }
349        }
350
351        private void addFirstBatchFakePrinters() {
352            List<PrinterInfo> printers = mFakePrinters.subList(0, mFakePrinters.size() / 2);
353            addPrinters(printers);
354        }
355
356        private void addSecondBatchFakePrinters() {
357            List<PrinterInfo> printers = mFakePrinters.subList(mFakePrinters.size() / 2,
358                    mFakePrinters.size());
359            addPrinters(printers);
360        }
361
362        private PrinterInfo findPrinterInfo(PrinterId printerId) {
363            List<PrinterInfo> printers = getPrinters();
364            final int printerCount = getPrinters().size();
365            for (int i = 0; i < printerCount; i++) {
366                PrinterInfo printer = printers.get(i);
367                if (printer.getId().equals(printerId)) {
368                    return printer;
369                }
370            }
371            return null;
372        }
373
374        private void cancellAddingFakePrinters() {
375            mSesionHandler.removeMessages(SessionHandler.MSG_ADD_FIRST_BATCH_FAKE_PRINTERS);
376            mSesionHandler.removeMessages(SessionHandler.MSG_ADD_SECOND_BATCH_FAKE_PRINTERS);
377        }
378
379        final class SessionHandler extends Handler {
380            public static final int MSG_ADD_FIRST_BATCH_FAKE_PRINTERS = 1;
381            public static final int MSG_ADD_SECOND_BATCH_FAKE_PRINTERS = 2;
382
383            public SessionHandler(Looper looper) {
384                super(looper, null, true);
385            }
386
387            @Override
388            public void handleMessage(Message message) {
389                switch (message.what) {
390                    case MSG_ADD_FIRST_BATCH_FAKE_PRINTERS: {
391                        addFirstBatchFakePrinters();
392                    } break;
393
394                    case MSG_ADD_SECOND_BATCH_FAKE_PRINTERS: {
395                        addSecondBatchFakePrinters();
396                    } break;
397                }
398            }
399        }
400    }
401}
402