Android webview转PDF的方法示例

compile 'org.droidparts.dexmaker:dexmaker-mockito:1.5'

File file = Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_DCIM + "/PDFTest.pdf");  File dexCacheFile;  // 获取需要打印的webview适配器  PrintDocumentAdapter printAdapter;  PageRange[] ranges;  ParcelFileDescriptor descriptor;  /**   a* @param webView   */  private void printPDFFile(WebView webView) {    if (android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.KITKAT) {      /**       * android 5.0之后，出于对动态注入字节码安全性德考虑，已经不允许随意指定字节码的保存路径了，需要放在应用自己的包名文件夹下。       */      //新的创建DexMaker缓存目录的方式，直接通过context获取路径      dexCacheFile = getDir("dex", 0);      if (!dexCacheFile.exists()) {        dexCacheFile.mkdir();      }      try {        //创建待写入的PDF文件，pdfFilePath为自行指定的PDF文件路径        if (file.exists()) {          file.delete();        }        file.createNewFile();        descriptor = ParcelFileDescriptor.open(file, ParcelFileDescriptor.MODE_READ_WRITE);        // 设置打印参数        PrintAttributes attributes = new PrintAttributes.Builder()            .setMediaSize(PrintAttributes.MediaSize.ISO_A4)            .setResolution(new PrintAttributes.Resolution("id", Context.PRINT_SERVICE, 300, 300))            .setColorMode(PrintAttributes.COLOR_MODE_COLOR)            .setMinMargins(PrintAttributes.Margins.NO_MARGINS)            .build();        //打印所有界面        ranges = new PageRange[]{PageRange.ALL_PAGES};        printAdapter = webView.createPrintDocumentAdapter();        // 开始打印        printAdapter.onStart();        printAdapter.onLayout(attributes, attributes, new CancellationSignal(), getLayoutResultCallback(new InvocationHandler() {          @Override          public Object invoke(Object proxy, Method method, Object[] args) throws Throwable {            if (method.getName().equals("onLayoutFinished")) {              // 监听到内部调用了onLayoutFinished()方法，即打印成功              onLayoutSuccess();            } else {              // 监听到打印失败或者取消了打印            }            return null;          }        }, dexCacheFile.getAbsoluteFile()), new Bundle());      } catch (IOException e) {        e.printStackTrace();      }    }  }  /**   * @throws IOException   */  private void onLayoutSuccess() throws IOException {    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT) {      PrintDocumentAdapter.WriteResultCallback callback = getWriteResultCallback(new InvocationHandler() {        @Override        public Object invoke(Object o, Method method, Object[] objects) throws Throwable {          if (method.getName().equals("onWriteFinished")) {            Toast.makeText(MainActivity.this,"Success",Toast.LENGTH_SHORT).show();            // PDF文件写入本地完成，导出成功            Log.e("onLayoutSuccess","onLayoutSuccess");          } else {            Toast.makeText(MainActivity.this,"导出失败",Toast.LENGTH_SHORT).show();          }          return null;        }      }, dexCacheFile.getAbsoluteFile());      //写入文件到本地      printAdapter.onWrite(ranges, descriptor, new CancellationSignal(), callback);    }else {      Toast.makeText(MainActivity.this,"不支持4.4.以下",Toast.LENGTH_SHORT).show();    }  }  @SuppressLint("NewApi")  public static PrintDocumentAdapter.LayoutResultCallback getLayoutResultCallback(InvocationHandler invocationHandler, File dexCacheDir) throws IOException {    return ProxyBuilder.forClass(PrintDocumentAdapter.LayoutResultCallback.class)        .dexCache(dexCacheDir)        .handler(invocationHandler)        .build();  }  @SuppressLint("NewApi")  public static PrintDocumentAdapter.WriteResultCallback getWriteResultCallback(InvocationHandler invocationHandler, File dexCacheDir) throws IOException {    return ProxyBuilder.forClass(PrintDocumentAdapter.WriteResultCallback.class)        .dexCache(dexCacheDir)        .handler(invocationHandler)        .build();  }