1 files changed, 121 insertions, 0 deletions
diff --git a/platform/android/MapboxGLAndroidSDK/src/main/java/com/mapbox/mapboxsdk/utils/FileUtils.java b/platform/android/MapboxGLAndroidSDK/src/main/java/com/mapbox/mapboxsdk/utils/FileUtils.java
new file mode 100644
index 0000000000..b7d09cda2a
--- /dev/null
+++ b/platform/android/MapboxGLAndroidSDK/src/main/java/com/mapbox/mapboxsdk/utils/FileUtils.java
@@ -0,0 +1,121 @@
+package com.mapbox.mapboxsdk.utils;
+
+import android.os.AsyncTask;
+
+import java.io.File;
+import java.lang.ref.WeakReference;
+
+public class FileUtils {
+
+  /**
+   * Task checking whether app's process can read a file.
+   */
+  public static class CheckFileReadPermissionTask extends AsyncTask<File, Void, Boolean> {
+    private final WeakReference<OnCheckFileReadPermissionListener> listenerWeakReference;
+
+    public CheckFileReadPermissionTask(OnCheckFileReadPermissionListener listener) {
+      this.listenerWeakReference = new WeakReference<>(listener);
+    }
+
+    @Override
+    protected Boolean doInBackground(File... files) {
+      try {
+        return files[0].canRead();
+      } catch (Exception ex) {
+        return false;
+      }
+    }
+
+    @Override
+    protected void onCancelled() {
+      OnCheckFileReadPermissionListener listener = listenerWeakReference.get();
+      if (listener != null) {
+        listener.onError();
+      }
+    }
+
+    @Override
+    protected void onPostExecute(Boolean result) {
+      OnCheckFileReadPermissionListener listener = listenerWeakReference.get();
+      if (listener != null) {
+        if (result) {
+          listener.onReadPermissionGranted();
+        } else {
+          listener.onError();
+        }
+      }
+    }
+  }
+
+  /**
+   * Interface definition for a callback invoked when checking file's read permissions.
+   */
+  public interface OnCheckFileReadPermissionListener {
+
+    /**
+     * Invoked when app's process has a permission to read a file.
+     */
+    void onReadPermissionGranted();
+
+    /**
+     * Invoked when app's process doesn't have a permission to read a file or an error occurs.
+     */
+    void onError();
+  }
+
+  /**
+   * Task checking whether app's process can write to a file.
+   */
+  public static class CheckFileWritePermissionTask extends AsyncTask<File, Void, Boolean> {
+    private final WeakReference<OnCheckFileWritePermissionListener> listenerWeakReference;
+
+    public CheckFileWritePermissionTask(OnCheckFileWritePermissionListener listener) {
+      this.listenerWeakReference = new WeakReference<>(listener);
+    }
+
+    @Override
+    protected Boolean doInBackground(File... files) {
+      try {
+        return files[0].canWrite();
+      } catch (Exception ex) {
+        return false;
+      }
+    }
+
+    @Override
+    protected void onCancelled() {
+      OnCheckFileWritePermissionListener listener = listenerWeakReference.get();
+      if (listener != null) {
+        listener.onError();
+      }
+    }
+
+    @Override
+    protected void onPostExecute(Boolean result) {
+      OnCheckFileWritePermissionListener listener = listenerWeakReference.get();
+      if (listener != null) {
+        if (result) {
+          listener.onWritePermissionGranted();
+        } else {
+          listener.onError();
+        }
+      }
+    }
+  }
+
+  /**
+   * Interface definition for a callback invoked when checking file's write permissions.
+   */
+  public interface OnCheckFileWritePermissionListener {
+
+    /**
+     * Invoked when app's process has a permission to write to a file.
+     */
+    void onWritePermissionGranted();
+
+    /**
+     * Invoked when app's process doesn't have a permission to write to a file or an error occurs.
+     */
+    void onError();
+  }
+}