Fix reliability of file association on Android

Author: nirvn

platform/android/AndroidManifest.xml.in

@@ -53,12 +53,18 @@
     android:theme="@style/AppTheme">
     <activity
       android:name="ch.opengis.@[email protected]"
+      android:taskAffinity="ch.opengis.@APP_PACKAGE_NAME@"
+      android:launchMode="singleInstance"
+      android:allowTaskReparenting="false"
+      android:documentLaunchMode="never"
+      android:alwaysRetainTaskState="true"
+      android:clearTaskOnLaunch="false"
       android:label="@APP_NAME@"
       android:icon="@AT@drawable/@APP_ICON@"
-      android:launchMode="singleTask"
       android:configChanges="orientation|uiMode|screenLayout|screenSize|smallestScreenSize|locale|fontScale|keyboard|keyboardHidden|navigation"
       android:theme="@style/AppTheme"
       android:exported="true">
+
       <intent-filter>
         <action android:name="android.intent.action.MAIN"/>
         <category android:name="android.intent.category.LAUNCHER"/>
@@ -93,7 +99,7 @@
       <intent-filter>
         <action android:name="android.intent.action.VIEW" />
         <category android:name="android.intent.category.DEFAULT" />
-        <category android:name="android.intent.category.BROWSABLE"/>
+        <category android:name="android.intent.category.BROWSABLE" />
         <data android:scheme="file" />
         <data android:scheme="content" />
         <data android:host="*" />
@@ -115,7 +121,7 @@
       <intent-filter>
         <action android:name="android.intent.action.VIEW" />
         <category android:name="android.intent.category.DEFAULT" />
-        <category android:name="android.intent.category.BROWSABLE"/>
+        <category android:name="android.intent.category.BROWSABLE" />
         <data android:scheme="file" />
         <data android:scheme="content" />
         <data android:host="*" />

platform/android/src/ch/opengis/qfield/QFieldActivity.java

@@ -127,6 +127,7 @@ public class QFieldActivity extends QtActivity {
     public static native void resourceCanceled(String message);
 
     private Intent projectIntent;
+
     private float originalBrightness;
     private boolean handleVolumeKeys = false;
     private String pathsToExport;
@@ -152,7 +153,12 @@ public void onCreate(Bundle savedInstanceState) {
 
     @Override
     public void onNewIntent(Intent intent) {
+        // Prevent activity restart
+        intent.setFlags(intent.getFlags() &
+                        ~(Intent.FLAG_ACTIVITY_NEW_TASK |
+                          Intent.FLAG_ACTIVITY_NEW_DOCUMENT));
         super.onNewIntent(intent);
+
         if (intent.getAction() == Intent.ACTION_VIEW ||
             intent.getAction() == Intent.ACTION_SEND) {
             projectIntent = intent;
@@ -522,8 +528,11 @@ private void prepareQtActivity() {
             }
         }
 
-        Intent intent = new Intent();
+        Intent intent = new Intent(Intent.ACTION_VIEW);
         intent.setClass(QFieldActivity.this, QtActivity.class);
+        // Prevent activity restart
+        intent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP |
+                        Intent.FLAG_ACTIVITY_SINGLE_TOP);
         try {
             ActivityInfo activityInfo = getPackageManager().getActivityInfo(
                 getComponentName(), PackageManager.GET_META_DATA);
@@ -548,6 +557,7 @@ private void prepareQtActivity() {
             projectIntent = sourceIntent;
             intent.putExtra("QGS_PROJECT", "trigger_load");
         }
+
         setIntent(intent);
     }