Android: Add support for getting information about content uris

This enables things like size(), exists() to work with Android content
uris with the provided uri given from a filedialog. It is expected that
it is always a full path due to the nature of content uris, so relative
paths will not work.

Change-Id: I9c9ea42833677eb9d937b33e9dd42ee2a7d9c7c5
Reviewed-by: Assam Boudjelthia <assam.boudjelthia@qt.io>
Reviewed-by: BogDan Vatra <bogdan@kdab.com>

1 files changed, 57 insertions, 0 deletions

diff --git a/src/android/jar/src/org/qtproject/qt5/android/QtNative.java b/src/android/jar/src/org/qtproject/qt5/android/QtNative.java
index 87d326e225..a8bf4c15e1 100644
--- a/src/android/jar/src/org/qtproject/qt5/android/QtNative.java
+++ b/src/android/jar/src/org/qtproject/qt5/android/QtNative.java
@@ -44,6 +44,7 @@ import java.io.File;
 import java.io.FileNotFoundException;
 import java.util.ArrayList;
 import java.util.concurrent.Semaphore;
+import java.io.IOException;
 
 import android.app.Activity;
 import android.app.Service;
@@ -70,6 +71,7 @@ import android.view.Menu;
 import android.view.MotionEvent;
 import android.view.View;
 import android.view.InputDevice;
+import android.database.Cursor;
 
 import java.lang.reflect.Method;
 import java.security.KeyStore;
@@ -231,6 +233,61 @@ public class QtNative
         }
     }
 
+    public static long getSize(Context context, String contentUrl)
+    {
+        Uri uri = getUriWithValidPermission(context, contentUrl, "r");
+        long size = -1;
+
+        if (uri == null) {
+            Log.e(QtTAG, "getSize(): No permissions to open Uri");
+            return size;
+        }
+
+        try {
+            ContentResolver resolver = context.getContentResolver();
+            Cursor cur = resolver.query(uri, null, null, null, null);
+            if (cur != null) {
+                if (cur.moveToFirst())
+                    size = cur.getLong(5); // size column
+                cur.close();
+            }
+            return size;
+        } catch (IllegalArgumentException e) {
+            Log.e(QtTAG, "getSize(): Invalid Uri");
+            return size;
+        }  catch (UnsupportedOperationException e) {
+            Log.e(QtTAG, "getSize(): Unsupported operation for given Uri");
+            return size;
+        }
+    }
+
+    public static boolean checkFileExists(Context context, String contentUrl)
+    {
+        Uri uri = getUriWithValidPermission(context, contentUrl, "r");
+        boolean exists = false;
+
+        if (uri == null) {
+            Log.e(QtTAG, "checkFileExists(): No permissions to open Uri");
+            return exists;
+        }
+
+        try {
+            ContentResolver resolver = context.getContentResolver();
+            Cursor cur = resolver.query(uri, null, null, null, null);
+            if (cur != null) {
+                exists = true;
+                cur.close();
+            }
+            return exists;
+        } catch (IllegalArgumentException e) {
+            Log.e(QtTAG, "checkFileExists(): Invalid Uri");
+            return exists;
+        } catch (UnsupportedOperationException e) {
+            Log.e(QtTAG, "checkFileExists(): Unsupported operation for given Uri");
+            return false;
+        }
+    }
+
     // this method loads full path libs
     public static void loadQtLibraries(final ArrayList<String> libraries)
     {