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 17 package foo.bar.permission2; 18 19 import java.io.FileOutputStream; 20 import java.io.IOException; 21 import java.util.ArrayList; 22 import java.util.Arrays; 23 import java.util.List; 24 25 import android.app.Activity; 26 import android.content.Context; 27 import android.graphics.Color; 28 import android.graphics.Paint; 29 import android.graphics.pdf.PdfDocument.Page; 30 import android.os.AsyncTask; 31 import android.os.Bundle; 32 import android.os.CancellationSignal; 33 import android.os.CancellationSignal.OnCancelListener; 34 import android.os.ParcelFileDescriptor; 35 import android.print.PageRange; 36 import android.print.PrintAttributes; 37 import android.print.PrintDocumentAdapter; 38 import android.print.PrintDocumentInfo; 39 import android.print.PrintManager; 40 import android.print.pdf.PrintedPdfDocument; 41 import android.util.Log; 42 import android.util.SparseIntArray; 43 import android.view.Menu; 44 import android.view.MenuItem; 45 import android.view.View; 46 47 /** 48 * Simple sample of how to use the print APIs. 49 */ 50 public class PrintActivity extends Activity { 51 52 public static final String LOG_TAG = "PrintActivity"; 53 54 private static final int PAGE_COUNT = 50; 55 56 @Override 57 protected void onCreate(Bundle savedInstanceState) { 58 super.onCreate(savedInstanceState); 59 setContentView(R.layout.activity_main); 60 } 61 62 @Override 63 public boolean onCreateOptionsMenu(Menu menu) { 64 super.onCreateOptionsMenu(menu); 65 getMenuInflater().inflate(R.menu.activity_main, menu); 66 return true; 67 } 68 69 @Override 70 public boolean onOptionsItemSelected(MenuItem item) { 71 if (item.getItemId() == R.id.menu_print) { 72 printView(); 73 return true; 74 } 75 return super.onOptionsItemSelected(item); 76 } 77 78 private void printView() { 79 PrintManager printManager = (PrintManager) getSystemService(Context.PRINT_SERVICE); 80 final View view = findViewById(R.id.content); 81 82 printManager.print("Print_View", 83 new PrintDocumentAdapter() { 84 private static final int RESULT_LAYOUT_FAILED = 1; 85 private static final int RESULT_LAYOUT_FINISHED = 2; 86 87 private PrintAttributes mPrintAttributes; 88 89 @Override 90 public void onStart() { 91 Log.i(LOG_TAG, "onStart"); 92 } 93 94 @Override 95 public void onFinish() { 96 Log.i(LOG_TAG, "onFinish"); 97 } 98 99 @Override 100 public void onLayout(final PrintAttributes oldAttributes, 101 final PrintAttributes newAttributes, 102 final CancellationSignal cancellationSignal, 103 final LayoutResultCallback callback, 104 final Bundle metadata) { 105 106 Log.i(LOG_TAG, "onLayout() oldAttrs:" + oldAttributes + "\n" 107 + "newAttrs:" + newAttributes + "\n" 108 + "preview:" + metadata.getBoolean( 109 PrintDocumentAdapter.EXTRA_PRINT_PREVIEW) ); 110 111 new AsyncTask<Void, Void, Integer>() { 112 @Override 113 protected void onPreExecute() { 114 // First register for cancellation requests. 115 cancellationSignal.setOnCancelListener(new OnCancelListener() { 116 @Override 117 public void onCancel() { 118 cancel(true); 119 } 120 }); 121 mPrintAttributes = newAttributes; 122 } 123 124 @Override 125 protected Integer doInBackground(Void... params) { 126 try { 127 // Pretend we do some layout work. 128 for (int i = 0; i < PAGE_COUNT; i++) { 129 // Be nice and respond to cancellation. 130 if (isCancelled()) { 131 return null; 132 } 133 pretendDoingLayoutWork(); 134 } 135 return RESULT_LAYOUT_FINISHED; 136 } catch (Exception e) { 137 return RESULT_LAYOUT_FAILED; 138 } 139 } 140 141 @Override 142 protected void onPostExecute(Integer result) { 143 // The task was not cancelled, so handle the layout result. 144 switch (result) { 145 case RESULT_LAYOUT_FINISHED: { 146 PrintDocumentInfo info = new PrintDocumentInfo 147 .Builder("print_view.pdf") 148 .setContentType(PrintDocumentInfo 149 .CONTENT_TYPE_DOCUMENT) 150 .setPageCount(PAGE_COUNT) 151 .build(); 152 callback.onLayoutFinished(info, false); 153 } break; 154 155 case RESULT_LAYOUT_FAILED: { 156 callback.onLayoutFailed(null); 157 } break; 158 } 159 } 160 161 @Override 162 protected void onCancelled(Integer result) { 163 // Task was cancelled, report that. 164 callback.onLayoutCancelled(); 165 } 166 167 private void pretendDoingLayoutWork() throws Exception { 168 169 } 170 }.executeOnExecutor(AsyncTask.THREAD_POOL_EXECUTOR, (Void[]) null); 171 } 172 173 @Override 174 public void onWrite(final PageRange[] pages, 175 final ParcelFileDescriptor destination, 176 final CancellationSignal cancellationSignal, 177 final WriteResultCallback callback) { 178 179 Log.i(LOG_TAG, "onWrite() pages:" + Arrays.toString(pages)); 180 181 new AsyncTask<Void, Void, Integer>() { 182 private static final int RESULT_WRITE_FAILED = 1; 183 private static final int RESULT_WRITE_FINISHED = 2; 184 185 private final SparseIntArray mWrittenPages = new SparseIntArray(); 186 private final PrintedPdfDocument mPdfDocument = new PrintedPdfDocument( 187 PrintActivity.this, mPrintAttributes); 188 189 @Override 190 protected void onPreExecute() { 191 // First register for cancellation requests. 192 cancellationSignal.setOnCancelListener(new OnCancelListener() { 193 @Override 194 public void onCancel() { 195 cancel(true); 196 } 197 }); 198 199 for (int i = 0; i < PAGE_COUNT; i++) { 200 // Be nice and respond to cancellation. 201 if (isCancelled()) { 202 return; 203 } 204 205 // Write the page only if it was requested. 206 if (containsPage(pages, i)) { 207 mWrittenPages.append(mWrittenPages.size(), i); 208 Page page = mPdfDocument.startPage(i); 209 // The page of the PDF backed canvas size is in pixels (1/72") and 210 // smaller that the view. We scale down the drawn content and to 211 // fit. This does not lead to losing data as PDF is a vector format. 212 final float scale = (float) Math.min(mPdfDocument.getPageWidth(), 213 mPdfDocument.getPageHeight()) / Math.max(view.getWidth(), view.getHeight()); 214 page.getCanvas().scale(scale, scale); 215 view.draw(page.getCanvas()); 216 217 218 Paint paint = new Paint(); 219 paint.setTextSize(100); 220 paint.setColor(Color.RED); 221 final int x = page.getCanvas().getWidth() / 2; 222 final int y = page.getCanvas().getHeight() / 2; 223 page.getCanvas().drawText(String.valueOf(i), x, y, paint); 224 225 mPdfDocument.finishPage(page); 226 } 227 } 228 } 229 230 @Override 231 protected Integer doInBackground(Void... params) { 232 // Write the data and return success or failure. 233 try { 234 mPdfDocument.writeTo(new FileOutputStream( 235 destination.getFileDescriptor())); 236 return RESULT_WRITE_FINISHED; 237 } catch (IOException ioe) { 238 return RESULT_WRITE_FAILED; 239 } 240 } 241 242 @Override 243 protected void onPostExecute(Integer result) { 244 // The task was not cancelled, so handle the write result. 245 switch (result) { 246 case RESULT_WRITE_FINISHED: { 247 PageRange[] pageRanges = computePageRanges(mWrittenPages); 248 callback.onWriteFinished(pageRanges); 249 } break; 250 251 case RESULT_WRITE_FAILED: { 252 callback.onWriteFailed(null); 253 } break; 254 } 255 256 mPdfDocument.close(); 257 } 258 259 @Override 260 protected void onCancelled(Integer result) { 261 // Task was cancelled, report that. 262 callback.onWriteCancelled(); 263 mPdfDocument.close(); 264 } 265 }.executeOnExecutor(AsyncTask.THREAD_POOL_EXECUTOR, (Void[]) null); 266 } 267 268 private PageRange[] computePageRanges(SparseIntArray writtenPages) { 269 List<PageRange> pageRanges = new ArrayList<PageRange>(); 270 271 int start = -1; 272 int end = -1; 273 final int writtenPageCount = writtenPages.size(); 274 for (int i = 0; i < writtenPageCount; i++) { 275 if (start < 0) { 276 start = writtenPages.valueAt(i); 277 } 278 int oldEnd = end = start; 279 while (i < writtenPageCount && (end - oldEnd) <= 1) { 280 oldEnd = end; 281 end = writtenPages.valueAt(i); 282 i++; 283 } 284 PageRange pageRange = new PageRange(start, end); 285 pageRanges.add(pageRange); 286 start = end = -1; 287 } 288 289 PageRange[] pageRangesArray = new PageRange[pageRanges.size()]; 290 pageRanges.toArray(pageRangesArray); 291 return pageRangesArray; 292 } 293 294 private boolean containsPage(PageRange[] pageRanges, int page) { 295 final int pageRangeCount = pageRanges.length; 296 for (int i = 0; i < pageRangeCount; i++) { 297 if (pageRanges[i].getStart() <= page 298 && pageRanges[i].getEnd() >= page) { 299 return true; 300 } 301 } 302 return false; 303 } 304 }, null); 305 } 306 } 307
