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 import foo.bar.print.R; 48 49 /** 50 * Simple sample of how to use the print APIs. 51 */ 52 public class PrintActivity extends Activity { 53 54 public static final String LOG_TAG = "PrintActivity"; 55 56 private static final int PAGE_COUNT = 50; 57 58 @Override 59 protected void onCreate(Bundle savedInstanceState) { 60 super.onCreate(savedInstanceState); 61 setContentView(R.layout.activity_main); 62 } 63 64 @Override 65 public boolean onCreateOptionsMenu(Menu menu) { 66 super.onCreateOptionsMenu(menu); 67 getMenuInflater().inflate(R.menu.activity_main, menu); 68 return true; 69 } 70 71 @Override 72 public boolean onOptionsItemSelected(MenuItem item) { 73 if (item.getItemId() == R.id.menu_print) { 74 printView(); 75 return true; 76 } 77 return super.onOptionsItemSelected(item); 78 } 79 80 private void printView() { 81 PrintManager printManager = (PrintManager) getSystemService(Context.PRINT_SERVICE); 82 final View view = findViewById(R.id.content); 83 84 printManager.print("Print_View", 85 new PrintDocumentAdapter() { 86 private static final int RESULT_LAYOUT_FAILED = 1; 87 private static final int RESULT_LAYOUT_FINISHED = 2; 88 89 private PrintAttributes mPrintAttributes; 90 91 @Override 92 public void onStart() { 93 Log.i(LOG_TAG, "onStart"); 94 } 95 96 @Override 97 public void onFinish() { 98 Log.i(LOG_TAG, "onFinish"); 99 } 100 101 @Override 102 public void onLayout(final PrintAttributes oldAttributes, 103 final PrintAttributes newAttributes, 104 final CancellationSignal cancellationSignal, 105 final LayoutResultCallback callback, 106 final Bundle metadata) { 107 108 Log.i(LOG_TAG, "onLayout() oldAttrs:" + oldAttributes + "\n" 109 + "newAttrs:" + newAttributes + "\n" 110 + "preview:" + metadata.getBoolean( 111 PrintDocumentAdapter.EXTRA_PRINT_PREVIEW) ); 112 113 new AsyncTask<Void, Void, Integer>() { 114 @Override 115 protected void onPreExecute() { 116 // First register for cancellation requests. 117 cancellationSignal.setOnCancelListener(new OnCancelListener() { 118 @Override 119 public void onCancel() { 120 cancel(true); 121 } 122 }); 123 mPrintAttributes = newAttributes; 124 } 125 126 @Override 127 protected Integer doInBackground(Void... params) { 128 try { 129 // Pretend we do some layout work. 130 for (int i = 0; i < PAGE_COUNT; i++) { 131 // Be nice and respond to cancellation. 132 if (isCancelled()) { 133 return null; 134 } 135 pretendDoingLayoutWork(); 136 } 137 return RESULT_LAYOUT_FINISHED; 138 } catch (Exception e) { 139 return RESULT_LAYOUT_FAILED; 140 } 141 } 142 143 @Override 144 protected void onPostExecute(Integer result) { 145 // The task was not cancelled, so handle the layout result. 146 switch (result) { 147 case RESULT_LAYOUT_FINISHED: { 148 PrintDocumentInfo info = new PrintDocumentInfo 149 .Builder("print_view.pdf") 150 .setContentType(PrintDocumentInfo 151 .CONTENT_TYPE_DOCUMENT) 152 .setPageCount(PAGE_COUNT) 153 .build(); 154 callback.onLayoutFinished(info, false); 155 } break; 156 157 case RESULT_LAYOUT_FAILED: { 158 callback.onLayoutFailed(null); 159 } break; 160 } 161 } 162 163 @Override 164 protected void onCancelled(Integer result) { 165 // Task was cancelled, report that. 166 callback.onLayoutCancelled(); 167 } 168 169 private void pretendDoingLayoutWork() throws Exception { 170 171 } 172 }.executeOnExecutor(AsyncTask.THREAD_POOL_EXECUTOR, (Void[]) null); 173 } 174 175 @Override 176 public void onWrite(final PageRange[] pages, 177 final ParcelFileDescriptor destination, 178 final CancellationSignal cancellationSignal, 179 final WriteResultCallback callback) { 180 181 Log.i(LOG_TAG, "onWrite() pages:" + Arrays.toString(pages)); 182 183 new AsyncTask<Void, Void, Integer>() { 184 private static final int RESULT_WRITE_FAILED = 1; 185 private static final int RESULT_WRITE_FINISHED = 2; 186 187 private final SparseIntArray mWrittenPages = new SparseIntArray(); 188 private final PrintedPdfDocument mPdfDocument = new PrintedPdfDocument( 189 PrintActivity.this, mPrintAttributes); 190 191 @Override 192 protected void onPreExecute() { 193 // First register for cancellation requests. 194 cancellationSignal.setOnCancelListener(new OnCancelListener() { 195 @Override 196 public void onCancel() { 197 cancel(true); 198 } 199 }); 200 201 for (int i = 0; i < PAGE_COUNT; i++) { 202 // Be nice and respond to cancellation. 203 if (isCancelled()) { 204 return; 205 } 206 207 // Write the page only if it was requested. 208 if (containsPage(pages, i)) { 209 mWrittenPages.append(mWrittenPages.size(), i); 210 Page page = mPdfDocument.startPage(i); 211 // The page of the PDF backed canvas size is in pixels (1/72") and 212 // smaller that the view. We scale down the drawn content and to 213 // fit. This does not lead to losing data as PDF is a vector format. 214 final float scale = (float) Math.min(mPdfDocument.getPageWidth(), 215 mPdfDocument.getPageHeight()) / Math.max(view.getWidth(), view.getHeight()); 216 page.getCanvas().scale(scale, scale); 217 view.draw(page.getCanvas()); 218 219 220 Paint paint = new Paint(); 221 paint.setTextSize(100); 222 paint.setColor(Color.RED); 223 final int x = page.getCanvas().getWidth() / 2; 224 final int y = page.getCanvas().getHeight() / 2; 225 page.getCanvas().drawText(String.valueOf(i), x, y, paint); 226 227 mPdfDocument.finishPage(page); 228 } 229 } 230 } 231 232 @Override 233 protected Integer doInBackground(Void... params) { 234 // Write the data and return success or failure. 235 try { 236 mPdfDocument.writeTo(new FileOutputStream( 237 destination.getFileDescriptor())); 238 return RESULT_WRITE_FINISHED; 239 } catch (IOException ioe) { 240 return RESULT_WRITE_FAILED; 241 } 242 } 243 244 @Override 245 protected void onPostExecute(Integer result) { 246 // The task was not cancelled, so handle the write result. 247 switch (result) { 248 case RESULT_WRITE_FINISHED: { 249 PageRange[] pageRanges = computePageRanges(mWrittenPages); 250 callback.onWriteFinished(pageRanges); 251 } break; 252 253 case RESULT_WRITE_FAILED: { 254 callback.onWriteFailed(null); 255 } break; 256 } 257 258 mPdfDocument.close(); 259 } 260 261 @Override 262 protected void onCancelled(Integer result) { 263 // Task was cancelled, report that. 264 callback.onWriteCancelled(); 265 mPdfDocument.close(); 266 } 267 }.executeOnExecutor(AsyncTask.THREAD_POOL_EXECUTOR, (Void[]) null); 268 } 269 270 private PageRange[] computePageRanges(SparseIntArray writtenPages) { 271 List<PageRange> pageRanges = new ArrayList<PageRange>(); 272 273 int start = -1; 274 int end = -1; 275 final int writtenPageCount = writtenPages.size(); 276 for (int i = 0; i < writtenPageCount; i++) { 277 if (start < 0) { 278 start = writtenPages.valueAt(i); 279 } 280 int oldEnd = end = start; 281 while (i < writtenPageCount && (end - oldEnd) <= 1) { 282 oldEnd = end; 283 end = writtenPages.valueAt(i); 284 i++; 285 } 286 PageRange pageRange = new PageRange(start, end); 287 pageRanges.add(pageRange); 288 start = end = -1; 289 } 290 291 PageRange[] pageRangesArray = new PageRange[pageRanges.size()]; 292 pageRanges.toArray(pageRangesArray); 293 return pageRangesArray; 294 } 295 296 private boolean containsPage(PageRange[] pageRanges, int page) { 297 final int pageRangeCount = pageRanges.length; 298 for (int i = 0; i < pageRangeCount; i++) { 299 if (pageRanges[i].getStart() <= page 300 && pageRanges[i].getEnd() >= page) { 301 return true; 302 } 303 } 304 return false; 305 } 306 }, null); 307 } 308 } 309
