Question

我用自己的应用程序打开了pdf。现在当用户点击按钮时，我显示openwith选项application / pdf。现在用户选择他的选择（例如adobe reader），打开的pdf文件必须显示在用户选择中（在这种情况下为adobereader）。对于打开的PDF，我有bytearray和输入流。

Answer 1

试试这个

File file = new File(Environment.getExternalStorageDirectory().getAbsolutePath() +"/"+ filename);
Intent target = new Intent(Intent.ACTION_VIEW);
target.setDataAndType(Uri.fromFile(file),"application/pdf");
target.setFlags(Intent.FLAG_ACTIVITY_NO_HISTORY);

Intent intent = Intent.createChooser(target, "Open File");
try {
startActivity(intent);
} catch (ActivityNotFoundException e) {
// Instruct the user to install a PDF reader here, or something
}

编辑1

 OutputStream out = new FileOutputStream("out.pdf");
 out.write(bArray);
 out.close();

创建pdf后，

File file = new File("filepath");
Intent target = new Intent(Intent.ACTION_VIEW);
target.setDataAndType(Uri.fromFile(file),"application/pdf");
target.setFlags(Intent.FLAG_ACTIVITY_NO_HISTORY);

Intent intent = Intent.createChooser(target, "Open File");
try {
startActivity(intent);
} catch (ActivityNotFoundException e) {
// Instruct the user to install a PDF reader here, or something
}

编辑2

File myFile = new File("out.pdf");
OutputStream out = new FileOutputStream(myFile);
        out.write(bytArray);
        out.close();

        Intent target = new Intent(Intent.ACTION_VIEW);
        target.setDataAndType(Uri.fromFile(myFile),"application/pdf");
        target.setFlags(Intent.FLAG_ACTIVITY_NO_HISTORY);

Intent intent = Intent.createChooser(target, "Open File");
try {
startActivity(intent);
} catch (ActivityNotFoundException e) {
// Instruct the user to install a PDF reader here, or something
}

这可能有助于你

编辑3

以下代码由我自己测试，并且它正如您所希望的那样

创建pdf文件：

File resolveMeSDCard  = new File("/sdcard/download/media/output.pdf");

 public void createPDF()
  {
      byte[] byt = new byte[]{1,2,3,4,5};

      File mediaDir = new File("/sdcard/download/media");
      if (!mediaDir.exists()){
          mediaDir.mkdir();
      }

      FileOutputStream fos;
    try {

        //File resolveMeSDCard = new File("/sdcard/download/media/output.pdf");
        resolveMeSDCard.createNewFile();
        fos = new FileOutputStream(resolveMeSDCard);
        fos.write(byt);
        fos.close();
         System.out.println("Your file has been written");  
    } catch (IOException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
         System.out.println("Your file has not been written");  
    }

  }

打开pdf文件：

  public void openPDF() 
  {
      Intent target = new Intent(Intent.ACTION_VIEW);
          target.setDataAndType(Uri.fromFile(resolveMeSDCard),"application/pdf");
        target.setFlags(Intent.FLAG_ACTIVITY_NO_HISTORY);

Intent intent = Intent.createChooser(target, "Open File");
try {
startActivity(intent);
} catch (ActivityNotFoundException e) {
// Instruct the user to install a PDF reader here, or something
}   
  }

的manifest.xml

添加以下权限

<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />

Note :
1.根据需要更改代码顺序。

2.call createPDF（），然后是OpenPDF（）。

这是有效的代码。

Answer 2

在app中点击openwith时我正在使用内容提供商，因为我的文件在物理上不可用...

 try {
            createCachedFile(this, attachmentFileName, bytes);
            startActivity(pdfOpenWith(this, attachmentFileName, bytes));
        }catch (IOException e) {
            e.printStackTrace();
        } catch (ActivityNotFoundException e) {
            Toast.makeText(this, "Not available on this device.", Toast.LENGTH_SHORT).show();
        }

public  void createCachedFile(Context context, String fileName, byte[] content) throws IOException {
    File cacheFile = new File(context.getCacheDir() + File.separator + fileName);
    cacheFile.createNewFile();
    BufferedOutputStream bostream = new BufferedOutputStream(new FileOutputStream(cacheFile));
    bostream.write(content);
    bostream.flush();
    bostream.close();
}

public static Intent pdfOpenWith(Activity context, String fileName, byte[] bytecontent)
{
    Intent pdfintent = new Intent(Intent.ACTION_VIEW);
    //pdfintent.setType("application/pdf");
    Uri contenturi = Uri.parse("content://" + AttachFileProvider.AUTHORITY + "/" + fileName);
    Toast.makeText(context, fileName, Toast.LENGTH_LONG).show ();
    pdfintent.setDataAndType(contenturi, "application/pdf");
    pdfintent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
    pdfintent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
    return pdfintent;

打开带有openwith选项android的pdf

2 个答案: