PDF Viewing Feature

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 +28,14 @@
 import android.graphics.Insets;
 import android.graphics.Color;
 
+import android.app.Activity;
+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;
 
@@ -123,6 +131,43 @@ public void hideSplashScreen()
     keepSplashScreenVisible = false;
   }
 
+  public boolean openFile( String filePath ) {
+    File file = new File( filePath );
+
+    if ( !file.exists() ) 
+    {
+        return false;
+    }
+
+    Intent showFileIntent = new Intent( Intent.ACTION_VIEW );
+
+    try 
+    {
+        Uri fileUri = FileProvider.getUriForFile( this, "uk.co.lutraconsulting.fileprovider", file );
+
+        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 )
+    {
+        return false;
+    }
+
+    if ( showFileIntent.resolveActivity( getPackageManager() ) != null ) 
+    {
+        startActivity( showFileIntent );
+    } 
+    else 
+    {
+        return false;
+    }
+
+    return true;
+  }
+
   public void quitGracefully()
   {
     String man = android.os.Build.MANUFACTURER.toUpperCase();

app/androidutils.cpp

@@ -227,6 +227,17 @@ void AndroidUtils::hideSplashScreen()
 #endif
 }
 
+bool AndroidUtils::openFile( const QString &filePath )
+{
+  bool result = false;
+#ifdef ANDROID
+  auto activity = QJniObject( QNativeInterface::QAndroidApplication::context() );
+  QJniObject jFilePath = QJniObject::fromString( filePath );
+  result = activity.callMethod<jboolean>( "openFile", "(Ljava/lang/String;)Z", jFilePath.object<jstring>() );
+#endif
+  return result;
+}
+
 bool AndroidUtils::requestStoragePermission()
 {
 #ifdef ANDROID

app/androidutils.h

@@ -69,6 +69,7 @@ class AndroidUtils: public QObject
       */
     Q_INVOKABLE void callImagePicker( const QString &code = "" );
     Q_INVOKABLE void callCamera( const QString &targetPath, const QString &code = "" );
+    Q_INVOKABLE bool openFile( const QString &filePath );
 
 #ifdef ANDROID
     const static int MEDIA_CODE = 101;

app/inpututils.cpp

@@ -57,8 +57,10 @@
 #include <Qt>
 #include <QDir>
 #include <QFile>
+#include <QMessageBox>
 #include <QFileInfo>
-#include <QRegularExpression>
+#include <QDesktopServices>
+#include <QUrl>
 #include <algorithm>
 #include <limits>
 #include <math.h>
@@ -2175,3 +2177,40 @@ QString InputUtils::getDeviceModel()
 #endif
   return QStringLiteral( "N/A" );
 }
+
+bool InputUtils::openLink( const QString &homePath, const QString &link )
+{
+  if ( link.startsWith( LOCAL_FILE_PREFIX ) )
+  {
+    QString relativePath = link.mid( QString( LOCAL_FILE_PREFIX ).length() );
+    QString absoluteLinkPath = homePath + QDir::separator() + relativePath;
+    if ( !fileExists( absoluteLinkPath ) )
+    {
+      return false;
+    }
+#ifdef Q_OS_ANDROID
+    if ( !mAndroidUtils->openFile( absoluteLinkPath ) )
+    {
+      return false;
+    }
+#elif defined(Q_OS_IOS)
+    if ( ! IosUtils::openFile( absoluteLinkPath ) )
+    {
+      return false;
+    }
+#else
+    // Desktop environments
+    QUrl fileUrl = QUrl::fromLocalFile( absoluteLinkPath );
+    if ( !QDesktopServices::openUrl( fileUrl ) )
+    {
+      return false;
+    }
+#endif
+  }
+  else
+  {
+    QDesktopServices::openUrl( QUrl( link ) );
+  }
+
+  return true;
+}

app/inpututils.h

@@ -174,6 +174,13 @@ 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 bool openLink( const QString &homePath, const QString &link );
+
     Q_INVOKABLE bool acquireCameraPermission();
 
     Q_INVOKABLE bool isBluetoothTurnedOn();
@@ -603,6 +610,8 @@ class InputUtils: public QObject
     static QUrl iconFromGeometry( const Qgis::GeometryType &geometry );
 
     AndroidUtils *mAndroidUtils = nullptr; // not owned
+
+    const QString LOCAL_FILE_PREFIX = QStringLiteral( "project://" );
 };
 
 #endif // INPUTUTILS_H

app/ios/iosutils.cpp

@@ -82,3 +82,12 @@ QString IosUtils::getDeviceModel()
 #endif
   return "";
 }
+
+bool IosUtils::openFile( const QString &filePath )
+{
+#ifdef Q_OS_IOS
+  return openFileImpl( filePath );
+#else
+  return false;
+#endif
+}

app/ios/iosutils.h

@@ -43,6 +43,8 @@ class IosUtils: public QObject
 
     Q_INVOKABLE QVector<int> getSafeArea();
 
+    Q_INVOKABLE static bool openFile( const QString &filePath );
+
     static Q_INVOKABLE QString getManufacturer();
     static Q_INVOKABLE QString getDeviceModel();
 
@@ -64,9 +66,10 @@ class IosUtils: public QObject
     void setIdleTimerDisabled();
 
     QVector<int> getSafeAreaImpl();
+
     static QString getManufacturerImpl();
     static QString getDeviceModelImpl();
-
+    static bool openFileImpl( const QString &filePath );
 };
 
 #endif // IOSUTILS_H

app/ios/iosutils.mm

@@ -15,6 +15,9 @@
 
 #include <UIKit/UIKit.h>
 #include <sys/utsname.h>
+#import <Foundation/Foundation.h>
+#import <UIKit/UIKit.h>
+#include <QString>
 #include "iosutils.h"
 
 void IosUtils::setIdleTimerDisabled()
@@ -54,3 +57,38 @@
   QString deviceModel = QString::fromUtf8( systemInfo.machine );
   return deviceModel.toUpper();
 }
+
+@interface FileOpener : UIViewController <UIDocumentInteractionControllerDelegate>
+@end
+
+@implementation FileOpener
+
+- ( UIViewController * )documentInteractionControllerViewControllerForPreview:( UIDocumentInteractionController * )ctrl
+{
+  return self;
+}
+
+@end
+
+bool IosUtils::openFileImpl( const QString &filePath )
+{
+  static FileOpener *viewer = nil;
+  NSURL *resourceURL = [NSURL fileURLWithPath:filePath.toNSString()];
+
+  UIDocumentInteractionController *interactionCtrl = [UIDocumentInteractionController interactionControllerWithURL:resourceURL];
+  UIViewController *rootViewController = [[[[UIApplication sharedApplication] windows] firstObject] rootViewController];
+
+  viewer = [[FileOpener alloc] init];
+  [rootViewController addChildViewController: viewer];
+  interactionCtrl.delegate = ( id<UIDocumentInteractionControllerDelegate> )viewer;
+
+  if ( ![interactionCtrl presentPreviewAnimated:NO] )
+  {
+    if ( ![interactionCtrl presentOptionsMenuFromRect:CGRectZero inView:viewer.view animated:NO] )
+    {
+      return false;
+    }
+  }
+
+  return true;
+}

app/qml/form/editors/MMFormRichTextViewer.qml

@@ -20,6 +20,7 @@ MMPrivateComponents.MMBaseInput {
   property bool _fieldShouldShowTitle: parent.fieldShouldShowTitle
 
   property string _fieldTitle: parent.fieldTitle
+  property string _fieldHomePath: parent.fieldHomePath
 
   title: _fieldShouldShowTitle ? _fieldTitle : ""
 
@@ -47,8 +48,11 @@ MMPrivateComponents.MMBaseInput {
       leftPadding: __style.margin20
       rightPadding: __style.margin20
 
-      onLinkActivated: function( link ) {
-        Qt.openUrlExternally( link )
+      onLinkActivated: function ( link ) {
+        if ( !__inputUtils.openLink( root._fieldHomePath, link.toString( ) ) )
+        {
+          __notificationModel.addError( "Could not open the file. It may not exist, could be invalid, or there might be no application available to open it." )
+        }
       }
     }
   }

app/qml/form/editors/MMFormTextMultilineEditor.qml

@@ -36,6 +36,7 @@ MMPrivateComponents.MMBaseInput {
   property string _fieldTitle: parent.fieldTitle
   property string _fieldErrorMessage: parent.fieldErrorMessage
   property string _fieldWarningMessage: parent.fieldWarningMessage
+  property string _fieldHomePath: parent.fieldHomePath
 
   property bool _fieldRememberValueSupported: parent.fieldRememberValueSupported
   property bool _fieldRememberValueState: parent.fieldRememberValueState
@@ -117,7 +118,13 @@ MMPrivateComponents.MMBaseInput {
       radius: __style.radius12
     }
 
-    onLinkActivated: ( link ) => Qt.openUrlExternally( link )
+    onLinkActivated: function ( link ) {
+      if ( !__inputUtils.openLink( root._fieldHomePath, link.toString( ) ) )
+      {
+        __notificationModel.addError( "Could not open the file. It may not exist, could be invalid, or there might be no application available to open it." )
+      }
+    }
+
     onTextChanged: root.editorValueChanged( textArea.text, textArea.text === "" )
   }
 

cmake_templates/AndroidManifest.xml.in

@@ -100,10 +100,15 @@
         <service android:process=":trackingThread" android:name=".PositionTrackingService" android:foregroundServiceType="location" android:stopWithTask="true"/>
     </application>
 
-    <!-- Explicitly mention that we need to use external app for capturing an image -->
+    <!-- Explicitly mention that we need to use external app for capturing an image and open file-->
     <queries>
-      <intent>
+    <intent>
         <action android:name="android.media.action.IMAGE_CAPTURE" />
-      </intent>
+    </intent>
+    <intent>
+        <action android:name="android.intent.action.VIEW" />
+        <category android:name="android.intent.category.BROWSABLE" />
+        <data android:scheme="https" />
+    </intent>
     </queries>
 </manifest>