Pdf Viewer For Android

A Simple PDF Viewer library which only occupies around 80kb while most of the Pdf viewer occupies upto 16MB space.

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✨ Major Enhancements in Our PDF Viewer Library ✨

Hello Developers! We're thrilled to share some significant enhancements we've made to our PDF viewer library. We've fine-tuned several aspects to enhance your experience and ensure top-notch performance and security. Here's what's new:

• Jetpack Compose Ready 🚀

  Step into the future with Jetpack Compose compatibility. Integrating our PDF viewer in Compose projects is now effortless, thanks to the PdfRendererViewCompose composable function.

• Turbocharged Performance 🏎️

  We've optimized performance to handle PDFs more efficiently, ensuring swift and smooth operations, even with large documents.

• Local and on device files 📁

  We have made it better and smooth with how local files are handled now, with latest permission policies.

• Seamless Orientation Adaptation 🔄

  Our library now smartly preserves your page position during orientation changes, ensuring uninterrupted reading sessions.

• Enhanced File Path Security 🔐

  Security just got stronger. We've revamped our file path handling to provide robust protection against directory traversal attacks, keeping your data safer than ever.

• Streamlined Caching System 💾

  Experience efficiency at its best! Our refined caching strategy smartly manages storage, retaining only the most recent PDF file to optimize performance and space usage.

• Discreet Screenshot Prevention Feature 🚫📸

  Privacy matters. Our new screenshot-blocking feature enhances data confidentiality in your app, keeping sensitive information secure from prying eyes.

• Flexible UI Customization ✨

  Your design, your rules. Enjoy complete freedom in customizing the PDF viewer's interface, ensuring a perfect match with your app's style and theme. Render the view directly in your screen now.

• 'NoActionBar' Theme Compatibility 🎨

  Seamless aesthetics, no matter the theme. Our library now gracefully integrates with 'NoActionBar' themes, ensuring a cohesive and appealing user interface.

Stay tuned as we continue to innovate and improve. Happy coding, and let's keep creating amazing experiences together!

How to integrate into your app? ⚙️

We have migrated our library to Maven Central for easier integration and better reliability. To use the Pdf Viewer library in your project, add the following dependency to your build.gradle file:

Latest version: without 'v'

Groovy DSL

dependencies {
    // Replace 'latest-version' with the actual latest version number
    implementation 'io.github.afreakyelf:Pdf-Viewer:latest-version'
}

Kotlin DSL

dependencies {
    // Replace 'latest-version' with the actual latest version number
    implementation("io.github.afreakyelf:Pdf-Viewer:latest-version")
}

Requirements:

• Minimum SDK version: 21
• Compile & Target SDK version: 35 (updated since version 2.2.0)

How to use the library?

Now you have integrated the library in your project but how do you use it? Well it's really easy. Just launch the intent with in following way: (Refer to MainActivity.kt for more details.)

Prerequisites

Ensure the library is included in your project's dependencies.

Launching PDF Viewer

Opening PDF from a URL

To display a PDF from a URL, use the following code:

/* Parameters:
- context: The context of your activity.
- pdfUrl: URL of the PDF to be displayed.
- pdfTitle: Title of the PDF document.
- saveTo: Determines how to handle saving the PDF (e.g., ASK_EVERYTIME prompts the user each time).
- enableDownload: Enables downloading of the PDF. */

PdfViewerActivity.launchPdfFromUrl(
    context = this,
    pdfUrl = "your_pdf_url_here",
    pdfTitle = "PDF Title",
    saveTo = saveTo.ASK_EVERYTIME,
    enableDownload = true
)

Opening PDF from Local Storage

To open a PDF stored in local storage:

/* Parameters:
- path: File path or URI of the local PDF.
- fromAssets: Set to false when loading from local storage. // FALSE by default
*/

PdfViewerActivity.launchPdfFromPath(
    context = this,
    path = "your_file_path_or_uri_here",
    pdfTitle = "Title",
    saveTo = saveTo.ASK_EVERYTIME,
    fromAssets = false
)

Opening PDF from Assets

To open a PDF from the app's assets folder:

/* Parameters:
- path: File path or URI of the local PDF.
- fromAssets: Set to true when loading from assets.
*/

PdfViewerActivity.launchPdfFromPath(
  context = this,
  path = "file_name_in_assets",
  pdfTitle = "Title",
  saveTo = saveTo.ASK_EVERYTIME,
  fromAssets = true
)

Loading PDF in a View

Load a PDF directly into a view:

Add PDF render view in your layout file

<com.rajat.pdfviewer.PdfRendererView
    android:id="@+id/pdfView"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    app:pdfView_divider="@drawable/pdf_viewer_divider"
    app:pdfView_showDivider="false" />

and in your kotlin file

binding.pdfView.initWithUrl(
  url = "your_pdf_url_here",
  lifecycleCoroutineScope = lifecycleScope,
  lifecycle = lifecycle
)

Using with Jetpack Compose

For Jetpack Compose, utilize PdfRendererViewCompose:

PdfRendererViewCompose(
    source = PdfSource.Remote("your_pdf_url_here"),
    lifecycleOwner = LocalLifecycleOwner.current,
    modifier = Modifier,
    headers = HeaderData(mapOf("Authorization" to "123456789")),
    statusCallBack = object : PdfRendererView.StatusCallBack {
                // Override functions here
    },
    zoomListener = object : PdfRendererView.ZoomListener {
                // Override functions here
        override fun onZoomChanged(isZoomedIn: Boolean, scale: Float) {
                    TODO("Not yet implemented")
         }
     }
)

That's all you need to integrate PDF rendering in your Compose application.

Track PDF Load & Zoom Events

You can monitor download progress, rendering success, page changes, and zoom state using the following callbacks:

PDF Load Status

Use the statusListener to get callbacks on PDF lifecycle events:

binding.pdfView.statusListener = object : PdfRendererView.StatusCallBack {
    override fun onPdfLoadStart() {
        Log.i("PDF Status", "Loading started")
    }

    override fun onPdfLoadProgress(progress: Int, downloadedBytes: Long, totalBytes: Long?) {
        Log.i("PDF Status", "Download progress: $progress%")
    }

    override fun onPdfLoadSuccess(absolutePath: String) {
        Log.i("PDF Status", "Load successful: $absolutePath")
    }

    override fun onError(error: Throwable) {
        Log.e("PDF Status", "Error loading PDF: ${error.message}")
    }

    override fun onPageChanged(currentPage: Int, totalPage: Int) {
        Log.i("PDF Status", "Page changed: $currentPage / $totalPage")
    }
  
    override fun onPdfRenderStart() {
      Log.i("PDF Status", "Render started")
    }

    override fun onPdfRenderSuccess() {
      Log.i("PDF Status", "Render successful")
      binding.pdfView.jumpToPage($number)  // Recommend to use `jumpToPage` inside `onPdfRenderSuccess`
    }
}

Zoom Change Listener

You can also monitor when the user zooms in or out using zoomListener:

binding.pdfView.zoomListener = object : PdfRendererView.ZoomListener {
    override fun onZoomChanged(isZoomedIn: Boolean, scale: Float) {
        Log.i("PDF Zoom", "Zoomed in: $isZoomedIn, Scale: $scale")
    }
}

Ui Customizations

You need to add the custom theme to styles.xml/themes.xml file and override the required attribute values. Parent theme can be either Theme.PdfView.Light or Theme.PdfView.Dark or the one with no actionbar from the application. Note: If parent is not one of the themes from this library, all of the pdfView attributes should be added to that theme.

<style name="Theme.PdfView.SelectedTheme" parent="@style/Theme.PdfView.Light">
    <item name="pdfView_backIcon">@drawable/ic_arrow_back</item>
    <item name="pdfView_showToolbar">true</item>
    <item name="pdfView_disableScreenshots">true</item>
    ...
</style>

Ui Customizations - Page number

You need to add the custom layout to pdf_view_page_no.xml file and override the required attribute values.

<?xml version="1.0" encoding="utf-8"?>  
<TextView xmlns:android="http://schemas.android.com/apk/res/android"  
  android:id="@+id/pageNo"  
  android:layout_width="wrap_content"  
  android:layout_height="wrap_content"  
  android:layout_margin="18dp"  
  android:background="#9C27B0"  
  android:paddingStart="12dp"  
  android:paddingTop="4dp"  
  android:paddingEnd="12dp"  
  android:paddingBottom="4dp"  
  android:textColor="#ffffff"  
  android:textSize="16sp"  
  android:visibility="gone" />

Ui Page number

You need to add the custom string to strings.xml file and override the required strings.xml values.

Default:

<string name="pdfView_page_no">%1$s of %2$s</string>

Custom:

<string name="pdfView_page_no" >%1$s / %2$s</string>

Supported attributes

Attribute Name	Type	Expected changes
pdfView_backIcon	drawable	Navigation icon
pdfView_downloadIcon	drawable	Download icon
pdfView_downloadIconTint	color	Download icon tint
pdfView_toolbarColor	color	Actionbar background color
pdfView_titleTextStyle	style	Actionbar title text appearance
pdfView_progressBar	style	Progress bar style

Who's using Pdf-Viewer?

👉 Check out who's using Pdf-Viewer

Contributing

Any contributions you make are greatly appreciated.

1. Fork the Project
2. Create your Feature Branch (git checkout -b feature/NewFeature)
3. Commit your Changes (git commit -m 'Add some NewFeature')
4. Push to the Branch (git push origin feature/NewFeature)
5. Open a Pull Request

Donations

If this library helps you save time during development, you can buy me a cup of coffee :)

Author

Maintained by Rajat Mittal