Accept intents to load a single PDF

Also refactor Presentation

README.md

@@ -4,7 +4,9 @@ Minimum Viable Goals:
 - [x] Presentation View - i.e. show on an external monitor - haven't seen another app do this yet!
 - [x] Immersive View - no system status bar etc.
 - [x] Autocrop margins
-- [ ] Open files the Android way - currently just a bundled test file
+- [ ] Open files the Android way
+- - [x] Accept intents to load a single PDF
+- - [ ] Built-in file browser with requisite permissions
 - [ ] Delete+Reorder Pages - doesn't have to save the source file, but does need to save a change journal
 - - [x] Tap thumbnails to hide/show pages
 - - [ ] Drag thumbnails to rearrange pages

app/src/main/AndroidManifest.xml

@@ -16,12 +16,17 @@
             android:name=".MainActivity"
             android:exported="true"
             android:label="@string/app_name"
+            android:launchMode="singleInstance"
             android:theme="@style/Theme.PDFcast.NoActionBar">
             <intent-filter>
                 <action android:name="android.intent.action.MAIN" />
-
                 <category android:name="android.intent.category.LAUNCHER" />
             </intent-filter>
+            <intent-filter android:label="Read PDF">
+                <action android:name="android.intent.action.VIEW" />
+                <category android:name="android.intent.category.DEFAULT" />
+                <data android:mimeType="application/pdf" android:scheme="content" />
+            </intent-filter>
         </activity>
     </application>
 

app/src/main/java/com/lhw/pdf/MainActivity.kt

@@ -1,17 +1,12 @@
 package com.lhw.pdf
 
-import android.app.Presentation
 import android.content.Context
+import android.content.Intent
 import android.graphics.PorterDuff
 import android.media.MediaRouter
 import android.os.Bundle
-import android.util.DisplayMetrics
-import android.view.Display
 import android.view.Menu
-import android.view.WindowManager
-import android.widget.HorizontalScrollView
 import android.widget.ImageView
-import android.widget.LinearLayout
 import com.google.android.material.snackbar.Snackbar
 import com.google.android.material.navigation.NavigationView
 import androidx.navigation.findNavController
@@ -33,15 +28,15 @@ import kotlin.math.min
 class MainActivity : AppCompatActivity() {
     private lateinit var appBarConfiguration: AppBarConfiguration
     private lateinit var binding: ActivityMainBinding
+    private lateinit var mediaRouter: MediaRouter
     private val thumbnailWidth = 500
     private val thumbnailHeight = 700
     private var renderAutoCrop = true
     private var pagesPerLandscape = 3F
-    private val presentationDisplayMetrics = DisplayMetrics()
+    private var presentation: MyPresentation? = null
     private lateinit var pdfDocument: PdfDocument
-    private lateinit var presentationScroll: HorizontalScrollView
-    private lateinit var presentationLayout: LinearLayout
     private val showPages = mutableListOf<Boolean>()
+    private val defaultCachedFileName = "cached.pdf"
 
     private fun inputStreamToCache(outputFilename: String, inputStream: InputStream): File {
         val fileCached = File(cacheDir, outputFilename)
@@ -54,66 +49,31 @@ class MainActivity : AppCompatActivity() {
         return fileCached
     }
 
-    private fun initializePdfDocument() {
+    private fun updatePresentationImages(reRender: Boolean = true) {
-        val inputStream = resources.openRawResource(R.raw.testpdf)
+        presentation?.let { p ->
-        pdfDocument = PdfDocument(inputStreamToCache("cached.pdf", inputStream), true)
+            if (reRender) {
-    }
+                println(p.displayMetrics)
-
+                val maxHeight: Int = p.displayMetrics.heightPixels
-    class MyPresentation(outerContext: Context, display: Display) : Presentation(outerContext, display) {
+                val maxWidth: Int = min(maxHeight * 5 / 7, (p.displayMetrics.widthPixels / pagesPerLandscape).toInt())
-
+                println("Rendering pages with maxHeight=$maxHeight maxWidth=$maxWidth")
-    }
-
-    private fun updatePresentationImages(rerender: Boolean = true) {
-        if (rerender) {
-            val maxHeight: Int = presentationDisplayMetrics.heightPixels
-            val maxWidth: Int = min(maxHeight*5/7, (presentationDisplayMetrics.widthPixels/pagesPerLandscape).toInt())
                 pdfDocument.renderPagesPresentation(maxWidth, maxHeight, renderAutoCrop)
             }
-        presentationLayout.removeAllViewsInLayout()
+            val bitmaps = showPages.withIndex()
-        showPages.withIndex().filter { (i, show) -> (show) }.forEach { (i, show) ->
+                .mapNotNull { (i, show) -> if (show) pdfDocument.bitmapPagesPresentation[i] else null }
-            val bitmap = pdfDocument.bitmapPagesPresentation[i]
+                .toList()
-            val img = ImageView(this)
+            p.updateImages(bitmaps)
-            img.setImageBitmap(bitmap)
-            presentationLayout.addView(img)
         }
     }
 
-    private fun presentationView() {
+    private fun makePresentationView() {
-        val mediaRouter = getSystemService(Context.MEDIA_ROUTER_SERVICE) as MediaRouter
+        mediaRouter.getSelectedRoute(MediaRouter.ROUTE_TYPE_LIVE_VIDEO)?.presentationDisplay?.let { display ->
-        val presentationDisplay = mediaRouter.getSelectedRoute(MediaRouter.ROUTE_TYPE_LIVE_VIDEO)?.presentationDisplay
+            presentation = MyPresentation(this, display)
-        if (presentationDisplay != null) {
-            val presentation = MyPresentation(this, presentationDisplay)
-            when (val pw = presentation.window) {
-                null -> {}
-                else -> {
-                    WindowCompat.getInsetsController(pw, pw.decorView).hide(WindowInsetsCompat.Type.systemBars())
-                }
-            }
-
-            @Suppress("DEPRECATION")
-            presentationDisplay.getMetrics(presentationDisplayMetrics)
-            presentationLayout = LinearLayout(presentation.context)
-            presentationScroll = HorizontalScrollView(presentation.context)
-            presentationScroll.addView(presentationLayout)
-            val layoutParams = WindowManager.LayoutParams()
-            presentation.addContentView(presentationScroll, layoutParams)
             updatePresentationImages()
-            presentation.show()
+            presentation?.show()
         }
     }
 
-    override fun onCreate(savedInstanceState: Bundle?) {
+    private fun populateThumbnails() {
-        super.onCreate(savedInstanceState)
-        val windowInsetsController = WindowCompat.getInsetsController(window, window.decorView)
-        windowInsetsController.hide(WindowInsetsCompat.Type.systemBars())
-
-        binding = ActivityMainBinding.inflate(layoutInflater)
-        setContentView(binding.root)
-
-        setSupportActionBar(binding.appBarMain.toolbar)
-
-        initializePdfDocument()
-        pdfDocument.renderThumbnails(thumbnailWidth, thumbnailHeight)
         val container = binding.appBarMain.contentMain.thumbnailsLayout
         for ((index, bitmap) in pdfDocument.bitmapThumbnails) {
             val img = ImageView(this)
@@ -126,14 +86,36 @@ class MainActivity : AppCompatActivity() {
             container.addView(img)
             showPages.add(true)
         }
-        presentationView()
+    }
 
+    override fun onCreate(savedInstanceState: Bundle?) {
+        super.onCreate(savedInstanceState)
+        mediaRouter = getSystemService(Context.MEDIA_ROUTER_SERVICE) as MediaRouter
+        //val windowInsetsController = WindowCompat.getInsetsController(window, window.decorView)
+        //windowInsetsController.hide(WindowInsetsCompat.Type.systemBars())  //Doesn't seem to actually fill the vacant space by default
+
+        binding = ActivityMainBinding.inflate(layoutInflater)
+        setContentView(binding.root)
+
+        setSupportActionBar(binding.appBarMain.toolbar)
+
+        // Load previous pdf, or included test pdf first
+        var file = File(cacheDir, defaultCachedFileName)
+        if (!file.exists()) {
+            file = inputStreamToCache(defaultCachedFileName, resources.openRawResource(R.raw.testpdf))
+        }
+        pdfDocument = PdfDocument(file, true)
+        // Then overwrite it with any pdf sent via intent
+        handleIntent(intent)
+
+        pdfDocument.renderThumbnails(thumbnailWidth, thumbnailHeight)
+        populateThumbnails()
+        makePresentationView()
+
+        val container = binding.appBarMain.contentMain.thumbnailsLayout
         val containerScroll = binding.appBarMain.contentMain.thumbnailsScroll
         containerScroll.viewTreeObserver.addOnScrollChangedListener {
-            presentationScroll.scrollTo(
+            presentation?.setScrollProgress(containerScroll.scrollX.toFloat() / (container.width - containerScroll.width))
-                containerScroll.scrollX * (presentationLayout.width - presentationScroll.width) / (container.width - containerScroll.width),
-                0
-            )
         }
 
         binding.appBarMain.crop.setOnClickListener { view ->
@@ -172,6 +154,22 @@ class MainActivity : AppCompatActivity() {
         navView.setupWithNavController(navController)
     }
 
+    private fun handleIntent(intent: Intent?) {
+        val uri = intent?.data
+        if (uri == null) {
+            println("null intent uri passed")
+            return
+        }
+        println("intent uri passed: $uri")
+        // Do something with the URI to load PDF file
+        pdfDocument = contentResolver.openInputStream(uri)?.let { PdfDocument(inputStreamToCache(defaultCachedFileName, it), true) } ?: pdfDocument
+    }
+
+    override fun onNewIntent(intent: Intent?) {
+        super.onNewIntent(intent)
+        handleIntent(intent)
+    }
+
     override fun onCreateOptionsMenu(menu: Menu): Boolean {
         // Inflate the menu; this adds items to the action bar if it is present.
         menuInflater.inflate(R.menu.main, menu)

app/src/main/java/com/lhw/pdf/MyPresentation.kt

@@ -0,0 +1,50 @@
+package com.lhw.pdf
+
+import android.app.Presentation
+import android.content.Context
+import android.graphics.Bitmap
+import android.util.DisplayMetrics
+import android.view.Display
+import android.view.WindowManager
+import android.widget.HorizontalScrollView
+import android.widget.ImageView
+import android.widget.LinearLayout
+import androidx.core.view.WindowCompat
+import androidx.core.view.WindowInsetsCompat
+
+class MyPresentation(outerContext: Context, display: Display) : Presentation(outerContext, display) {
+    val displayMetrics = DisplayMetrics()
+    private val layout = LinearLayout(this.context)
+    private val scroll = HorizontalScrollView(this.context)
+    private val layoutParams = WindowManager.LayoutParams()
+    init {
+        @Suppress("DEPRECATION")
+        display.getMetrics(displayMetrics)
+        window?.let {
+            WindowCompat.getInsetsController(it, it.decorView)
+                .hide(WindowInsetsCompat.Type.systemBars())
+        }
+        scroll.addView(layout)
+        println(layoutParams)
+        addContentView(scroll, layoutParams)
+    }
+
+    fun updateImages(bitmaps: Iterable<Bitmap>) {
+        println("Updating presentation images")
+        println("Layout has scale ${layout.scaleX} ${layout.scaleY}")
+        layout.removeAllViewsInLayout()
+        bitmaps.forEach {
+            val img = ImageView(this.context)
+            img.setImageBitmap(it)
+            layout.addView(img)
+            img.minimumWidth = it.width  // No idea what broke when I refactored this class
+            img.minimumHeight = it.height
+            println("${it.width}x${it.height}")
+        }
+        println("Presentation heights ${scroll.height} ${layout.height}")
+    }
+
+    fun setScrollProgress(progress: Float) {
+        scroll.scrollTo((progress * (layout.width - scroll.width)).toInt(), 0)
+    }
+}