Android PDF file viewer and openLink function working

app/android/res/xml/file_paths.xml

@@ -1,4 +1,7 @@
 <?xml version="1.0" encoding="utf-8"?>
 <paths xmlns:android="http://schemas.android.com/apk/res/android">
     <cache-path name="input_camera" path="./" />
+    <external-path
+        name="app_files"
+        path="Android/data/uk.co.lutraconsulting/" />
 </paths>

app/android/src/uk/co/lutraconsulting/InputActivity.java

@@ -28,6 +28,13 @@
 import android.graphics.Insets;
 import android.graphics.Color;
 
+import android.content.Intent;
+import android.net.Uri;
+import android.content.ActivityNotFoundException;
+import java.io.File;
+import androidx.core.content.FileProvider;
+import android.widget.Toast;
+
 import androidx.core.view.WindowCompat;
 import androidx.core.splashscreen.SplashScreen;
 
@@ -115,6 +122,42 @@ public void hideSplashScreen()
     keepSplashScreenVisible = false;
   }
 
+  public void openFile( String filePath ) {
+    Log.d( TAG, "Expected file path: " + filePath );
+
+    File file = new File( filePath );
+
+    if ( !file.exists() ) {
+        Log.d( TAG, "File does not exist: " + filePath );
+        runOnUiThread( () -> Toast.makeText( getApplicationContext(), "File not available", Toast.LENGTH_SHORT ).show() );
+        return;
+    } else {
+        Log.d( TAG, "File exists: " + filePath );
+    }
+
+    Intent showFileIntent = new Intent( Intent.ACTION_VIEW );
+
+    try {
+        Uri fileUri = FileProvider.getUriForFile( this, "uk.co.lutraconsulting.fileprovider", file );
+        Log.d( TAG, "File URI: " + fileUri.toString() );
+
+        showFileIntent.setData( fileUri );
+
+        // FLAG_GRANT_READ_URI_PERMISSION grants temporary read permission to the content URI.
+        // FLAG_ACTIVITY_NEW_TASK is used when starting an Activity from a non-Activity context.
+        showFileIntent.setFlags( Intent.FLAG_ACTIVITY_NEW_TASK | Intent.FLAG_GRANT_READ_URI_PERMISSION );
+      } catch ( IllegalArgumentException e ) {
+        Log.d( TAG, "FileProvider URI issue", e );
+        return;
+    }
+
+    if ( showFileIntent.resolveActivity( getPackageManager() ) != null ) {
+        startActivity( showFileIntent );
+    } else {
+        runOnUiThread( () -> Toast.makeText( getApplicationContext(), "No application for opening this file", Toast.LENGTH_SHORT ).show() );
+    }
+  }
+
   public void quitGracefully()
   {
     String man = android.os.Build.MANUFACTURER.toUpperCase();

app/androidutils.cpp

@@ -207,6 +207,15 @@ void AndroidUtils::hideSplashScreen()
 #endif
 }
 
+void AndroidUtils::openFile( const QString &filePath )
+{
+#ifdef ANDROID
+  auto activity = QJniObject( QNativeInterface::QAndroidApplication::context() );
+  QJniObject jFilePath = QJniObject::fromString( filePath );
+  activity.callMethod<void>( "openFile", "(Ljava/lang/String;)V", jFilePath.object<jstring>() );
+#endif
+}
+
 bool AndroidUtils::requestStoragePermission()
 {
 #ifdef ANDROID

app/androidutils.h

@@ -67,6 +67,7 @@ class AndroidUtils: public QObject
       */
     Q_INVOKABLE void callImagePicker( const QString &code = "" );
     Q_INVOKABLE void callCamera( const QString &targetPath, const QString &code = "" );
+    Q_INVOKABLE void openFile( const QString &filePath );
 
 #ifdef ANDROID
     const static int MEDIA_CODE = 101;

app/inpututils.cpp

@@ -56,7 +56,7 @@
 #include <QDir>
 #include <QFile>
 #include <QFileInfo>
-#include <QRegularExpression>
+#include <QDesktopServices>
 #include <algorithm>
 #include <limits>
 #include <math.h>
@@ -2141,3 +2141,36 @@ QList<QgsPoint> InputUtils::parsePositionUpdates( const QString &data )
 
   return parsedUpdates;
 }
+
+void InputUtils::openLink( const QString &homePath, const QString &link )
+{
+  qDebug() << "LINK" << link;
+  qDebug() << "HOMEPATH" << homePath;
+
+  QString cleanedLink = link.trimmed();
+  static QRegularExpression re( "^\\?|\\?$" );
+  cleanedLink.remove( re );
+
+  qDebug() << "cleanedLink" << cleanedLink;
+
+  if ( cleanedLink.startsWith( "project://" ) )
+  {
+    QString relativePath = cleanedLink.mid( QString( "project://" ).length() );
+    QString absoluteLinkPath = homePath + QDir::separator() + relativePath;
+
+    qDebug() << "relativePath" << relativePath;
+    qDebug() << "absoluteLinkPath" << absoluteLinkPath;
+
+#ifdef Q_OS_ANDROID
+    qDebug() << "openLink android";
+    mAndroidUtils->openFile( absoluteLinkPath );
+#elif defined(Q_OS_IOS)
+    qDebug() << "openLink ios";
+#endif
+  }
+  else
+  {
+    cleanedLink.chop( 1 ); //remove \ from cleanedLink
+    QDesktopServices::openUrl( QUrl( cleanedLink) );
+  }
+}

app/inpututils.h

@@ -168,6 +168,13 @@ class InputUtils: public QObject
      */
     Q_INVOKABLE static QString bytesToHumanSize( double bytes );
 
+    /**
+     * Opens the specified link in an appropriate application. For "project://" links, it converts them to
+     * absolute paths and opens with default file handlers. Other links are opened in the default web browser.
+     * @param link The link to open, either a "project://" link or a standard URL.
+     */
+    Q_INVOKABLE void openLink( const QString &homePath, const QString &link );
+
     Q_INVOKABLE bool acquireCameraPermission();
 
     Q_INVOKABLE bool isBluetoothTurnedOn();

app/qml/form/editors/MMFormTextMultilineEditor.qml

@@ -27,6 +27,8 @@ MMBaseInput {
   property var _fieldConfig: parent.fieldConfig
   property bool _fieldValueIsNull: parent.fieldValueIsNull
 
+  property string _fieldHomePath: parent.fieldHomePath
+
   property bool _fieldShouldShowTitle: parent.fieldShouldShowTitle
   property bool _fieldIsReadOnly: parent.fieldIsReadOnly
 
@@ -87,7 +89,7 @@ MMBaseInput {
     wrapMode: Text.WordWrap
 
     onLinkActivated: function( link ) {
-      Qt.openUrlExternally( link )
+      __inputUtils.openLink( root._fieldHomePath, link )
     }
 
     onTextChanged: root.editorValueChanged( text, text === "" )