libpdfviewer: update to PdfViewer 14

.github/workflows/build.yml

@@ -10,11 +10,11 @@ jobs:
       - uses: actions/checkout@v3
         with:
           submodules: true
-      - name: Set up JDK 17
+      - name: Set up JDK 18
-        uses: actions/setup-java@v2
+        uses: actions/setup-java@v3
         with:
           distribution: 'temurin'
-          java-version: 17
+          java-version: 18
           cache: gradle
       - name: Build with Gradle
         run: ./gradlew build --no-daemon

app/src/main/assets/viewer.js

@@ -198,15 +198,27 @@ function isTextSelected() {
     return window.getSelection().toString() !== "";
 }
 
-pdfjsLib.getDocument("https://localhost/placeholder.pdf").promise.then(function(newDoc) {
+function loadDocument() {
-    pdfDoc = newDoc;
+    const pdfPassword = channel.getPassword();
-    channel.setNumPages(pdfDoc.numPages);
+    const loadingTask = pdfjsLib.getDocument({ url: "https://localhost/placeholder.pdf", password: pdfPassword });
-    pdfDoc.getMetadata().then(function(data) {
+    loadingTask.onPassword = (_, error) => {
-        channel.setDocumentProperties(JSON.stringify(data.info));
+        if (error === pdfjsLib.PasswordResponses.NEED_PASSWORD) {
-    }).catch(function(error) {
+            channel.showPasswordPrompt();
-        console.log("getMetadata error: " + error);
+        } else if (error === pdfjsLib.PasswordResponses.INCORRECT_PASSWORD) {
+            channel.invalidPassword();
+        }
+    }
+
+    loadingTask.promise.then(function (newDoc) {
+        pdfDoc = newDoc;
+        channel.setNumPages(pdfDoc.numPages);
+        pdfDoc.getMetadata().then(function (data) {
+            channel.setDocumentProperties(JSON.stringify(data.info));
+        }).catch(function (error) {
+            console.log("getMetadata error: " + error);
+        });
+        renderPage(channel.getPage(), false, false);
+    }, function (reason) {
+        console.error(reason.name + ": " + reason.message);
     });
-    renderPage(channel.getPage(), false, false);
+}
-}).catch(function(error) {
-    console.log("getDocument error: " + error);
-});

app/src/main/java/app/grapheneos/pdfviewer/GestureHelper.java

@@ -2,6 +2,8 @@ package app.grapheneos.pdfviewer;
 
 import android.annotation.SuppressLint;
 import android.content.Context;
+import android.view.GestureDetector;
+import android.view.MotionEvent;
 import android.view.ScaleGestureDetector;
 import android.view.View;
 
@@ -11,6 +13,7 @@ import android.view.View;
 
 class GestureHelper {
     public interface GestureListener {
+        boolean onTapUp();
         // Can be replaced with ratio when supported
         void onZoomIn(float value);
         void onZoomOut(float value);
@@ -19,6 +22,15 @@ class GestureHelper {
 
     @SuppressLint("ClickableViewAccessibility")
     static void attach(Context context, View gestureView, GestureListener listener) {
+
+        final GestureDetector detector = new GestureDetector(context,
+                new GestureDetector.SimpleOnGestureListener() {
+                    @Override
+                    public boolean onSingleTapUp(MotionEvent motionEvent) {
+                        return listener.onTapUp();
+                    }
+                });
+
         final ScaleGestureDetector scaleDetector = new ScaleGestureDetector(context,
                 new ScaleGestureDetector.SimpleOnScaleGestureListener() {
                     final float SPAN_RATIO = 600;
@@ -55,6 +67,7 @@ class GestureHelper {
                 });
 
         gestureView.setOnTouchListener((view, motionEvent) -> {
+            detector.onTouchEvent(motionEvent);
             scaleDetector.onTouchEvent(motionEvent);
             return false;
         });

app/src/main/java/app/grapheneos/pdfviewer/PdfViewer.java

@@ -8,11 +8,11 @@ import android.os.Build;
 import android.os.Bundle;
 import android.util.Log;
 import android.view.Gravity;
-import android.view.LayoutInflater;
 import android.view.Menu;
 import android.view.MenuInflater;
 import android.view.MenuItem;
 import android.view.View;
+import android.view.ViewGroup;
 import android.webkit.CookieManager;
 import android.webkit.JavascriptInterface;
 import android.webkit.WebResourceRequest;
@@ -26,14 +26,23 @@ import android.widget.Toast;
 import androidx.annotation.NonNull;
 import androidx.annotation.RequiresApi;
 import androidx.appcompat.app.AppCompatActivity;
+import androidx.core.graphics.Insets;
+import androidx.core.view.ViewCompat;
+import androidx.core.view.WindowCompat;
+import androidx.core.view.WindowInsetsCompat;
+import androidx.fragment.app.Fragment;
 import androidx.loader.app.LoaderManager;
 import androidx.loader.content.Loader;
 
+import com.google.android.material.snackbar.Snackbar;
+
 import app.grapheneos.pdfviewer.databinding.PdfviewerBinding;
 import app.grapheneos.pdfviewer.fragment.DocumentPropertiesFragment;
+import app.grapheneos.pdfviewer.fragment.PasswordPromptFragment;
 import app.grapheneos.pdfviewer.fragment.JumpToPageFragment;
 import app.grapheneos.pdfviewer.loader.DocumentPropertiesLoader;
 
+import java.io.ByteArrayInputStream;
 import java.io.IOException;
 import java.io.InputStream;
 import java.util.HashMap;
@@ -67,6 +76,7 @@ public class PdfViewer implements LoaderManager.LoaderCallbacks<List<CharSequenc
         "document-domain=(), " +
         "encrypted-media=(), " +
         "fullscreen=(), " +
+        "gamepad=(), " +
         "geolocation=(), " +
         "gyroscope=(), " +
         "hid=(), " +
@@ -80,6 +90,7 @@ public class PdfViewer implements LoaderManager.LoaderCallbacks<List<CharSequenc
         "publickey-credentials-get=(), " +
         "screen-wake-lock=(), " +
         "serial=(), " +
+        "speaker-selection=(), " +
         "sync-xhr=(), " +
         "usb=(), " +
         "xr-spatial-tracking=()";
@@ -97,8 +108,9 @@ public class PdfViewer implements LoaderManager.LoaderCallbacks<List<CharSequenc
     private float mZoomRatio = 1f;
     private int mDocumentOrientationDegrees;
     private int mDocumentState;
+    private String mEncryptedDocumentPassword;
     private List<CharSequence> mDocumentProperties;
-    private InputStream mInputStream;
+    private ByteArrayInputStream mInputStream;
 
     private PdfviewerBinding binding;
     private TextView mTextView;
@@ -107,6 +119,8 @@ public class PdfViewer implements LoaderManager.LoaderCallbacks<List<CharSequenc
     AppCompatActivity activity;
     String fileName;
     Long fileSize;
+    private Snackbar snackbar;
+    private PasswordPromptFragment mPasswordPromptFragment;
 
     private class Channel {
         @JavascriptInterface
@@ -140,13 +154,49 @@ public class PdfViewer implements LoaderManager.LoaderCallbacks<List<CharSequenc
             args.putString(KEY_PROPERTIES, properties);
             activity.runOnUiThread(() -> LoaderManager.getInstance(PdfViewer.this.activity).restartLoader(DocumentPropertiesLoader.ID, args, PdfViewer.this));
         }
+
+        @JavascriptInterface
+        public void showPasswordPrompt() {
+            if (getPasswordPromptFragment().isAdded()) {
+                getPasswordPromptFragment().dismiss();
+            }
+            getPasswordPromptFragment().show(activity.getSupportFragmentManager(), PasswordPromptFragment.class.getName());
+        }
+
+        @JavascriptInterface
+        public void invalidPassword() {
+            activity.runOnUiThread(PdfViewer.this::notifyInvalidPassword);
+            showPasswordPrompt();
+        }
+
+        @JavascriptInterface
+        public String getPassword() {
+            return mEncryptedDocumentPassword != null ? mEncryptedDocumentPassword : "";
+        }
+    }
+
+    private void notifyInvalidPassword() {
+        snackbar.setText(R.string.password_prompt_invalid_password).show();
     }
 
     public PdfViewer(@NonNull AppCompatActivity activity) {
         this.activity = activity;
-        LayoutInflater inflater = activity.getLayoutInflater();
+        binding = PdfviewerBinding.inflate(activity.getLayoutInflater());
-        binding = PdfviewerBinding.inflate(inflater);
         activity.setContentView(binding.getRoot());
+        activity.setSupportActionBar(binding.toolbar);
+
+        WindowCompat.setDecorFitsSystemWindows(activity.getWindow(), false);
+
+        // Margins for the toolbar are needed, so that content of the toolbar
+        // is not covered by a system button navigation bar when in landscape.
+        ViewCompat.setOnApplyWindowInsetsListener(binding.toolbar, (v, windowInsets) -> {
+            Insets insets = windowInsets.getInsets(WindowInsetsCompat.Type.systemBars());
+            ViewGroup.MarginLayoutParams mlp = (ViewGroup.MarginLayoutParams) v.getLayoutParams();
+            mlp.leftMargin = insets.left;
+            mlp.rightMargin = insets.right;
+            v.setLayoutParams(mlp);
+            return windowInsets;
+        });
 
         binding.webview.setBackgroundColor(Color.TRANSPARENT);
 
@@ -189,6 +239,7 @@ public class PdfViewer implements LoaderManager.LoaderCallbacks<List<CharSequenc
                 Log.d(TAG, "path " + path);
 
                 if ("/placeholder.pdf".equals(path)) {
+                    mInputStream.reset();
                     return new WebResourceResponse("application/pdf", null, mInputStream);
                 }
 
@@ -222,11 +273,27 @@ public class PdfViewer implements LoaderManager.LoaderCallbacks<List<CharSequenc
             public void onPageFinished(WebView view, String url) {
                 mDocumentState = STATE_LOADED;
                 activity.invalidateOptionsMenu();
+                loadPdfWithPassword(mEncryptedDocumentPassword);
             }
         });
 
         GestureHelper.attach(activity, binding.webview,
                 new GestureHelper.GestureListener() {
+                    @Override
+                    public boolean onTapUp() {
+                        binding.webview.evaluateJavascript("isTextSelected()", selection -> {
+                            if (!Boolean.parseBoolean(selection)) {
+                                if ((activity.getWindow().getDecorView().getSystemUiVisibility() &
+                                        View.SYSTEM_UI_FLAG_FULLSCREEN) == 0) {
+                                    hideSystemUi();
+                                } else {
+                                    showSystemUi();
+                                }
+                            }
+                        });
+                        return true;
+                    }
+
                     @Override
                     public void onZoomIn(float value) {
                         zoomIn(value, false);
@@ -248,17 +315,44 @@ public class PdfViewer implements LoaderManager.LoaderCallbacks<List<CharSequenc
         mTextView.setTextColor(ColorStateList.valueOf(Color.WHITE));
         mTextView.setTextSize(18);
         mTextView.setPadding(PADDING, 0, PADDING, 0);
+
+        snackbar = Snackbar.make(binding.getRoot(), "", Snackbar.LENGTH_LONG);
     }
 
-    public void onCreateOptionMenu(Menu menu) {
+    public void onDestroy() {
-        MenuInflater inflater = activity.getMenuInflater();
+        binding.webview.removeJavascriptInterface("channel");
-        inflater.inflate(R.menu.pdf_viewer, menu);
+        binding.getRoot().removeView(binding.webview);
+        binding.webview.destroy();
+        maybeCloseInputStream();
+    }
+
+    void maybeCloseInputStream() {
+        InputStream stream = mInputStream;
+        if (stream == null) {
+            return;
+        }
+        mInputStream = null;
+        try {
+            stream.close();
+        } catch (IOException ignored) {}
+    }
+
+    private PasswordPromptFragment getPasswordPromptFragment() {
+        if (mPasswordPromptFragment == null) {
+            final Fragment fragment = activity.getSupportFragmentManager().findFragmentByTag(PasswordPromptFragment.class.getName());
+            if (fragment != null) {
+                mPasswordPromptFragment = (PasswordPromptFragment) fragment;
+            } else {
+                mPasswordPromptFragment = new PasswordPromptFragment(this);
+            }
+        }
+        return mPasswordPromptFragment;
     }
 
     public void onResume() {
+        // The user could have left the activity to update the WebView
+        activity.invalidateOptionsMenu();
         if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
-            // The user could have left the activity to update the WebView
-            activity.invalidateOptionsMenu();
             if (getWebViewRelease() >= MIN_WEBVIEW_RELEASE) {
                 binding.webviewOutOfDateLayout.setVisibility(View.GONE);
                 binding.webview.setVisibility(View.VISIBLE);
@@ -294,14 +388,20 @@ public class PdfViewer implements LoaderManager.LoaderCallbacks<List<CharSequenc
         mDocumentProperties = null;
     }
 
-    public void loadPdf(InputStream inputStream, String fileName, Long fileSize) {
+    public void loadPdf(ByteArrayInputStream inputStream, String fileName, Long fileSize) {
         mPage = 1;
         mDocumentProperties = null;
         mInputStream = inputStream;
         this.fileName = fileName;
         this.fileSize = fileSize;
-        binding.webview.loadUrl("https://localhost/viewer.html");
+        showSystemUi();
         activity.invalidateOptionsMenu();
+        binding.webview.loadUrl("https://localhost/viewer.html");
+    }
+
+    public void loadPdfWithPassword(final String password) {
+        mEncryptedDocumentPassword = password;
+        binding.webview.evaluateJavascript("loadDocument()", null);
     }
 
     private void renderPage(final int zoom) {
@@ -355,6 +455,25 @@ public class PdfViewer implements LoaderManager.LoaderCallbacks<List<CharSequenc
         }
     }
 
+    private void showSystemUi() {
+        activity.getWindow().getDecorView().setSystemUiVisibility(
+                View.SYSTEM_UI_FLAG_LAYOUT_STABLE |
+                View.SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION |
+                View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN);
+        activity.getSupportActionBar().show();
+    }
+
+    private void hideSystemUi() {
+        activity.getWindow().getDecorView().setSystemUiVisibility(
+                View.SYSTEM_UI_FLAG_LAYOUT_STABLE |
+                View.SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION |
+                View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN |
+                View.SYSTEM_UI_FLAG_HIDE_NAVIGATION |
+                View.SYSTEM_UI_FLAG_FULLSCREEN |
+                View.SYSTEM_UI_FLAG_IMMERSIVE);
+        activity.getSupportActionBar().hide();
+    }
+
     private void showPageNumber() {
         if (mToast != null) {
             mToast.cancel();
@@ -367,11 +486,15 @@ public class PdfViewer implements LoaderManager.LoaderCallbacks<List<CharSequenc
         mToast.show();
     }
 
+    public void onCreateOptionMenu(Menu menu) {
+        MenuInflater inflater = activity.getMenuInflater();
+        inflater.inflate(R.menu.pdf_viewer, menu);
+    }
+
     public boolean onPrepareOptionsMenu(Menu menu) {
-        final int[] ids = { R.id.action_zoom_in, R.id.action_zoom_out, R.id.action_jump_to_page,
+        final int[] ids = {R.id.action_jump_to_page, R.id.action_next, R.id.action_previous,
-                R.id.action_next, R.id.action_previous, R.id.action_first, R.id.action_last,
+                R.id.action_first, R.id.action_last, R.id.action_rotate_clockwise,
-                R.id.action_rotate_clockwise, R.id.action_rotate_counterclockwise,
+                R.id.action_rotate_counterclockwise, R.id.action_view_document_properties};
-                R.id.action_view_document_properties };
         if (mDocumentState < STATE_LOADED) {
             for (final int id : ids) {
                 final MenuItem item = menu.findItem(id);
@@ -389,8 +512,6 @@ public class PdfViewer implements LoaderManager.LoaderCallbacks<List<CharSequenc
             mDocumentState = STATE_END;
         }
 
-        enableDisableMenuItem(menu.findItem(R.id.action_zoom_in), mZoomRatio != MAX_ZOOM_RATIO);
-        enableDisableMenuItem(menu.findItem(R.id.action_zoom_out), mZoomRatio != MIN_ZOOM_RATIO);
         enableDisableMenuItem(menu.findItem(R.id.action_next), mPage < mNumPages);
         enableDisableMenuItem(menu.findItem(R.id.action_previous), mPage > 1);
 
@@ -411,12 +532,6 @@ public class PdfViewer implements LoaderManager.LoaderCallbacks<List<CharSequenc
         } else if (itemId == R.id.action_last) {
             onJumpToPageInDocument(mNumPages);
             return true;
-        } else if (itemId == R.id.action_zoom_out) {
-            zoomOut(0.25f, true);
-            return true;
-        } else if (itemId == R.id.action_zoom_in) {
-            zoomIn(0.25f, true);
-            return true;
         } else if (itemId == R.id.action_rotate_clockwise) {
             documentOrientationChanged(90);
             return true;

app/src/main/java/app/grapheneos/pdfviewer/fragment/PasswordPromptFragment.kt

@@ -0,0 +1,67 @@
+package app.grapheneos.pdfviewer.fragment
+
+import android.app.Dialog
+import android.content.DialogInterface
+import android.os.Bundle
+import android.text.Editable
+import android.text.TextUtils
+import android.text.TextWatcher
+import android.view.LayoutInflater
+import android.view.WindowManager
+import android.view.inputmethod.EditorInfo.IME_ACTION_DONE
+import android.widget.EditText
+import androidx.appcompat.app.AlertDialog
+import androidx.fragment.app.DialogFragment
+import app.grapheneos.pdfviewer.PdfViewer
+import app.grapheneos.pdfviewer.R
+import app.grapheneos.pdfviewer.databinding.PasswordDialogFragmentBinding
+
+class PasswordPromptFragment(private val pdfViewer: PdfViewer) : DialogFragment() {
+
+    private lateinit var passwordEditText : EditText
+
+    override fun onCreateDialog(savedInstanceState: Bundle?): Dialog {
+        val passwordPrompt = AlertDialog.Builder(requireContext())
+        val passwordDialogFragmentBinding =
+            PasswordDialogFragmentBinding.inflate(LayoutInflater.from(requireContext()))
+        passwordEditText = passwordDialogFragmentBinding.pdfPasswordEditText
+        passwordPrompt.setView(passwordDialogFragmentBinding.root)
+        passwordEditText.addTextChangedListener(object : TextWatcher {
+            override fun beforeTextChanged(charSequence: CharSequence, i: Int, i1: Int, i2: Int) {}
+            override fun onTextChanged(input: CharSequence, i: Int, i1: Int, i2: Int) {
+                updatePositiveButton()
+            }
+            override fun afterTextChanged(editable: Editable) {}
+        })
+        passwordEditText.setOnEditorActionListener { _, actionId, _ ->
+            if (actionId != IME_ACTION_DONE) return@setOnEditorActionListener false
+            sendPassword()
+            true
+        }
+        passwordPrompt.setPositiveButton(R.string.open) { _, _ -> sendPassword() }
+        passwordPrompt.setNegativeButton(R.string.cancel, null)
+        val dialog = passwordPrompt.create()
+        dialog.setCanceledOnTouchOutside(false)
+        dialog.window?.setSoftInputMode(WindowManager.LayoutParams.SOFT_INPUT_STATE_VISIBLE)
+        return dialog
+    }
+
+    private fun updatePositiveButton() {
+        val btn = (dialog as AlertDialog).getButton(DialogInterface.BUTTON_POSITIVE)
+        btn.isEnabled = passwordEditText.text?.isNotEmpty() ?: false
+    }
+
+    private fun sendPassword() {
+        val password = passwordEditText.text.toString()
+        if (!TextUtils.isEmpty(password)) {
+            pdfViewer.loadPdfWithPassword(password)
+            dialog?.dismiss()
+        }
+    }
+
+    override fun onStart() {
+        super.onStart()
+        updatePositiveButton()
+        passwordEditText.requestFocus()
+    }
+}

app/src/main/res/drawable/ic_insert_drive_file_24dp.xml

@@ -1,9 +0,0 @@
-<vector xmlns:android="http://schemas.android.com/apk/res/android"
-    android:width="24dp"
-    android:height="24dp"
-    android:viewportWidth="24"
-    android:viewportHeight="24">
-    <path
-        android:fillColor="?attr/colorControlNormal"
-        android:pathData="M6,2c-1.1,0 -1.99,0.9 -1.99,2L4,20c0,1.1 0.89,2 1.99,2L18,22c1.1,0 2,-0.9 2,-2L20,8.83c0,-0.53 -0.21,-1.04 -0.59,-1.41l-4.83,-4.83c-0.37,-0.38 -0.88,-0.59 -1.41,-0.59L6,2zM13,8L13,3.5L18.5,9L14,9c-0.55,0 -1,-0.45 -1,-1z" />
-</vector>

app/src/main/res/drawable/ic_zoom_in_24dp.xml

@@ -1,9 +0,0 @@
-<vector xmlns:android="http://schemas.android.com/apk/res/android"
-    android:width="24dp"
-    android:height="24dp"
-    android:viewportWidth="24"
-    android:viewportHeight="24">
-    <path
-        android:fillColor="?attr/colorControlNormal"
-        android:pathData="M15.5,14h-0.79l-0.28,-0.27c1.2,-1.4 1.82,-3.31 1.48,-5.34 -0.47,-2.78 -2.79,-5 -5.59,-5.34 -4.23,-0.52 -7.78,3.04 -7.27,7.27 0.34,2.8 2.56,5.12 5.34,5.59 2.03,0.34 3.94,-0.28 5.34,-1.48l0.27,0.28v0.79l4.26,4.25c0.41,0.41 1.07,0.41 1.48,0l0.01,-0.01c0.41,-0.41 0.41,-1.07 0,-1.48L15.5,14zM9.5,14C7.01,14 5,11.99 5,9.5S7.01,5 9.5,5 14,7.01 14,9.5 11.99,14 9.5,14zM9.5,7c-0.28,0 -0.5,0.22 -0.5,0.5L9,9L7.5,9c-0.28,0 -0.5,0.22 -0.5,0.5s0.22,0.5 0.5,0.5L9,10v1.5c0,0.28 0.22,0.5 0.5,0.5s0.5,-0.22 0.5,-0.5L10,10h1.5c0.28,0 0.5,-0.22 0.5,-0.5s-0.22,-0.5 -0.5,-0.5L10,9L10,7.5c0,-0.28 -0.22,-0.5 -0.5,-0.5z" />
-</vector>

app/src/main/res/drawable/ic_zoom_out_24dp.xml

@@ -1,9 +0,0 @@
-<vector xmlns:android="http://schemas.android.com/apk/res/android"
-    android:width="24dp"
-    android:height="24dp"
-    android:viewportWidth="24"
-    android:viewportHeight="24">
-    <path
-        android:fillColor="?attr/colorControlNormal"
-        android:pathData="M15.5,14h-0.79l-0.28,-0.27c1.2,-1.4 1.82,-3.31 1.48,-5.34 -0.47,-2.78 -2.79,-5 -5.59,-5.34 -4.23,-0.52 -7.79,3.04 -7.27,7.27 0.34,2.8 2.56,5.12 5.34,5.59 2.03,0.34 3.94,-0.28 5.34,-1.48l0.27,0.28v0.79l4.26,4.25c0.41,0.41 1.07,0.41 1.48,0l0.01,-0.01c0.41,-0.41 0.41,-1.07 0,-1.48L15.5,14zM9.5,14C7.01,14 5,11.99 5,9.5S7.01,5 9.5,5 14,7.01 14,9.5 11.99,14 9.5,14zM7.5,9h4c0.28,0 0.5,0.22 0.5,0.5s-0.22,0.5 -0.5,0.5h-4c-0.28,0 -0.5,-0.22 -0.5,-0.5s0.22,-0.5 0.5,-0.5z" />
-</vector>

app/src/main/res/layout/password_dialog_fragment.xml

@@ -0,0 +1,38 @@
+<?xml version="1.0" encoding="utf-8"?>
+<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:app="http://schemas.android.com/apk/res-auto"
+    android:layout_width="wrap_content"
+    android:layout_height="wrap_content"
+    android:orientation="vertical">
+
+    <TextView
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:layout_marginStart="24dp"
+        android:layout_marginTop="24dp"
+        android:layout_marginEnd="24dp"
+        android:layout_marginBottom="20dp"
+        android:text="@string/password_prompt_description"
+        android:textColor="?android:attr/colorAccent"
+        android:textSize="20sp" />
+
+    <com.google.android.material.textfield.TextInputLayout
+        style="@style/Widget.Material3.TextInputLayout.OutlinedBox"
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        app:hintEnabled="false"
+        app:passwordToggleEnabled="true"
+        app:passwordToggleTint="?android:attr/colorAccent">
+
+        <com.google.android.material.textfield.TextInputEditText
+            android:id="@+id/pdf_password_edit_text"
+            android:layout_width="match_parent"
+            android:layout_height="wrap_content"
+            android:layout_marginStart="24dp"
+            android:layout_marginEnd="24dp"
+            android:layout_marginBottom="24dp"
+            android:hint="@string/password_prompt_hint"
+            android:inputType="textPassword" />
+
+    </com.google.android.material.textfield.TextInputLayout>
+</LinearLayout>

app/src/main/res/layout/pdfviewer.xml

@@ -4,6 +4,21 @@
     android:layout_width="match_parent"
     android:layout_height="match_parent">
 
+    <com.google.android.material.appbar.AppBarLayout
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:fitsSystemWindows="true"
+        android:theme="@style/AppTheme.AppBarOverlay">
+
+        <com.google.android.material.appbar.MaterialToolbar
+            android:id="@+id/toolbar"
+            android:layout_width="match_parent"
+            android:layout_height="?attr/actionBarSize"
+            android:background="#212121"
+            app:popupTheme="@style/AppTheme.PopupOverlay" />
+
+    </com.google.android.material.appbar.AppBarLayout>
+
     <WebView
         android:id="@+id/webview"
         android:layout_width="match_parent"

app/src/main/res/menu/pdf_viewer.xml

@@ -19,18 +19,6 @@
         android:title="@string/action_next"
         app:showAsAction="ifRoom" />
 
-    <item
-        android:id="@+id/action_zoom_out"
-        android:icon="@drawable/ic_zoom_out_24dp"
-        android:title="@string/action_zoom_out"
-        app:showAsAction="ifRoom" />
-
-    <item
-        android:id="@+id/action_zoom_in"
-        android:icon="@drawable/ic_zoom_in_24dp"
-        android:title="@string/action_zoom_in"
-        app:showAsAction="ifRoom" />
-
     <item
         android:id="@+id/action_first"
         android:icon="@drawable/ic_first_page_24dp"

app/src/main/res/values-night/styles.xml

@@ -0,0 +1,13 @@
+<resources>
+
+    <!-- Base application theme. -->
+    <style name="AppTheme" parent="Theme.Material3.DayNight.NoActionBar">
+        <!-- Customize your theme here. -->
+        <item name="colorPrimary">#DEFFFFFF</item>
+        <item name="android:statusBarColor">#212121</item>
+        <item name="android:navigationBarColor">@android:color/transparent</item>
+    </style>
+
+    <style name="AppTheme.PopupOverlay" parent="ThemeOverlay.Material3.Dark" />
+
+</resources>

app/src/main/res/values/strings.xml

@@ -6,20 +6,20 @@
     <string name="action_next">Next page</string>
     <string name="action_first">First page</string>
     <string name="action_last">Last page</string>
-    <string name="action_zoom_out">Zoom out</string>
+    <string name="action_jump_to_page">Jump to page</string>
-    <string name="action_zoom_in">Zoom in</string>
     <string name="action_rotate_clockwise">Rotate clockwise</string>
     <string name="action_rotate_counterclockwise">Rotate counterclockwise</string>
-    <string name="action_jump_to_page">Jump to page</string>
     <string name="action_view_document_properties">Properties</string>
 
     <string name="document_properties_invalid_date">Invalid date</string>
     <string name="document_properties_retrieval_failed">Failed to obtain document metadata</string>
 
-    <string name="invalid_mime_type">Cannot open file with invalid MIME type</string>
-    <string name="legacy_file_uri">Cannot open legacy file paths from insecure apps</string>
-    <string name="io_error">Received I/O error trying to open content</string>
-
     <string name="webview_out_of_date_title">WebView out-of-date</string>
-    <string name="webview_out_of_date_message">Your current WebView version is %d. The WebView should be at least version %d for the PDF Viewer to work.</string>
+    <string name="webview_out_of_date_message">Your current WebView version is %1$d. The WebView should be at least version %2$d for the PDF Viewer to work.</string>
+
+    <string name="password_prompt_hint">Password</string>
+    <string name="password_prompt_description">Enter the password to decrypt this PDF file</string>
+    <string name="password_prompt_invalid_password">Invalid password</string>
+    <string name="open">Open</string>
+    <string name="cancel">Cancel</string>
 </resources>

app/src/main/res/values/styles.xml

@@ -0,0 +1,15 @@
+<resources>
+
+    <!-- Base application theme. -->
+    <style name="AppTheme" parent="Theme.Material3.DayNight.NoActionBar">
+        <!-- Customize your theme here. -->
+        <item name="colorPrimary">#000000</item>
+        <item name="android:statusBarColor">#212121</item>
+        <item name="android:navigationBarColor">@android:color/transparent</item>
+    </style>
+
+    <style name="AppTheme.AppBarOverlay" parent="ThemeOverlay.Material3.Dark" />
+
+    <style name="AppTheme.PopupOverlay" parent="ThemeOverlay.Material3.Light" />
+
+</resources>

build.gradle.kts

@@ -4,8 +4,8 @@ buildscript {
         mavenCentral()
     }
     dependencies {
-        classpath("com.android.tools.build:gradle:7.1.2")
+        classpath("com.android.tools.build:gradle:7.1.3")
-        classpath("org.jetbrains.kotlin:kotlin-gradle-plugin:1.6.10")
+        classpath("org.jetbrains.kotlin:kotlin-gradle-plugin:1.6.21")
     }
 }
 

gradle/wrapper/gradle-wrapper.properties

@@ -1,6 +1,6 @@
 distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
-distributionSha256Sum=e5444a57cda4a95f90b0c9446a9e1b47d3d7f69057765bfb54bd4f482542d548
+distributionSha256Sum=29e49b10984e585d8118b7d0bc452f944e386458df27371b49b4ac1dec4b7fda
-distributionUrl=https\://services.gradle.org/distributions/gradle-7.4.1-bin.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-7.4.2-bin.zip
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists