try opening files too

app/src/main/java/com/simplemobiletools/filemanager/Utils.java

@@ -11,6 +11,10 @@ public class Utils {
         return path.substring(path.lastIndexOf("/") + 1);
     }
 
+    public static String getFileExtension(String fileName) {
+        return fileName.substring(fileName.lastIndexOf(".") + 1, fileName.length()).toLowerCase();
+    }
+
     public static void showToast(Context context, int resId) {
         Toast.makeText(context, context.getResources().getString(resId), Toast.LENGTH_SHORT).show();
     }

app/src/main/java/com/simplemobiletools/filemanager/activities/MainActivity.java

@@ -23,11 +23,6 @@ public class MainActivity extends AppCompatActivity implements ItemsFragment.Ite
         super.onCreate(savedInstanceState);
         setContentView(R.layout.activity_main);
         ButterKnife.bind(this);
-    }
-
-    @Override
-    protected void onResume() {
-        super.onResume();
         tryInitFileManager();
     }
 

app/src/main/java/com/simplemobiletools/filemanager/fragments/ItemsFragment.java

@@ -1,10 +1,14 @@
 package com.simplemobiletools.filemanager.fragments;
 
+import android.content.ActivityNotFoundException;
+import android.content.Intent;
+import android.net.Uri;
 import android.os.Bundle;
 import android.support.annotation.Nullable;
 import android.view.LayoutInflater;
 import android.view.View;
 import android.view.ViewGroup;
+import android.webkit.MimeTypeMap;
 import android.widget.AdapterView;
 import android.widget.ListView;
 
@@ -70,6 +74,19 @@ public class ItemsFragment extends android.support.v4.app.Fragment implements Ad
         final FileDirItem item = mItems.get(position);
         if (item.getIsDirectory()) {
             mListener.itemClicked(item.getPath());
+        } else {
+            final String path = item.getPath();
+            final File file = new File(path);
+            MimeTypeMap myMime = MimeTypeMap.getSingleton();
+            Intent newIntent = new Intent(Intent.ACTION_VIEW);
+            String mimeType = myMime.getMimeTypeFromExtension(Utils.getFileExtension(path));
+            newIntent.setDataAndType(Uri.fromFile(file), mimeType);
+            newIntent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
+            try {
+                startActivity(newIntent);
+            } catch (ActivityNotFoundException e) {
+                Utils.showToast(getContext(), R.string.no_app_found);
+            }
         }
     }
 

app/src/main/res/values/strings.xml

@@ -1,4 +1,5 @@
 <resources>
     <string name="app_name">Simple File Manager</string>
     <string name="no_permissions">We need the permission to access your storage</string>
+    <string name="no_app_found">No app for opening this type of files is available</string>
 </resources>