How to render PDF in Android

In my application I will receive a byte stream and convert it to a pdf file in the phone memory. How do I render that to a pdf开发者_C百科? And show it on an activity?

Some phones (like the Nexus One) come with a version of Quickoffice pre-installed so it may be as easy as sending the appropriate Intent once you've saved the file to the SD card.

public class OpenPdf extends Activity {
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);

        Button button = (Button) findViewById(R.id.OpenPdfButton);
        button.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                File file = new File("/sdcard/example.pdf");

                if (file.exists()) {
                    Uri path = Uri.fromFile(file);
                    Intent intent = new Intent(Intent.ACTION_VIEW);
                    intent.setDataAndType(path, "application/pdf");
                    intent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);

                    try {
                        startActivity(intent);
                    } 
                    catch (ActivityNotFoundException e) {
                        Toast.makeText(OpenPdf.this, 
                            "No Application Available to View PDF", 
                            Toast.LENGTH_SHORT).show();
                    }
                }
            }
        });
    }
}

Open pdf file in webview.

public class MyPdfViewActivity extends Activity {

  @Override
  protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    WebView mWebView=new WebView(MyPdfViewActivity.this);
    mWebView.getSettings().setJavaScriptEnabled(true);
    mWebView.getSettings().setPluginsEnabled(true);
    mWebView.loadUrl("https://docs.google.com/gview?embedded=true&url="+LinkTo);
    setContentView(mWebView);
  }
}

Android-Lollipop (api 21) introduce a new API : PdfRenderer

This API allows you to create a Bitmap from a page in a PDF document.

Shortly :

• get a seekable file descriptor from your pdf document :

    ParcelFileDescriptor fd = ParcelFileDescriptor.open(file, ParcelFileDescriptor.MODE_READ_ONLY)
  

• create the PdfRenderer

    PdfRenderer renderer = new PdfRenderer(fd);
  

• prepare the Bitmap

    Bitmap bitmap = Bitmap.createBitmap(WIDTH, HEIGHT, Bitmap.Config.ARGB_4444);
  

• get the PdfRenderer.Page to render

    PdfRenderer.Page page = renderer.openPage(pageIndex);
  

• render the page on the prepared bitmap

    page.render(bitmap, null, null, PdfRenderer.Page.RENDER_MODE_FOR_DISPLAY);
  

• now you can do what you want with the bitmap.

• note that the 2 null args may allow you to clip some portion in the page and perform a transformation (using a Matrix) of the clip

• there is another rendering mode : RENDER_MODE_FOR_PRINT. If you need this mode there are some guidelines to use it properly : here are the details.

This library is simple and works well: Android Pdf Viewer https://github.com/barteksc/AndroidPdfViewer

Old Reply...

I think that Joan Zapata give us the better and simple solution:

https://github.com/JoanZapata/android-pdfview

I assure you that it works!

1: https://github.com/JoanZapata/android-pdfview

For the local pdf files, you can render them through the third party libraries. for example, use the MuPDF library, its supported file types include PDF, PNG and JPEG.

One shortcoming of MuPDF is that it uses native library to fulfill the target, so it won't be easy to port the application on BlackBerry platform later.

To open a pdf from a byte array, you can use RadaeePDF, you can do the following into your activity:

private PDFReader m_vPDF = null;
private Document doc = new Document();

public void onCreate(Bundle savedInstanceState){
    super.onCreate(savedInstanceState);
    Global.Init(this);

    m_vPDF = new PDFReader(this);
    doc.Close();

    int ret = m_doc.OpenMem(data, password);
        switch( ret )
        {
            case -1://need input password
                finish();
                break;
            case -2://unknown encryption
                finish();
                break;
            case -3://damaged or invalid format
                finish();
                break;
            case -10://access denied or invalid file path
                finish();
                break;
            case 0://succeeded, and continue
                break;
            default://unknown error
                finish();
                break;
        }

    m_vPDF.open(doc);

    setContentView( m_vPDF );
}