Add gridview (not working)

app/src/main/java/io/github/wulkanowy/activity/dashboard/DashboardActivity.java

@@ -18,7 +18,7 @@ import io.github.wulkanowy.activity.dashboard.marks.MarksFragment;
 public class DashboardActivity extends AppCompatActivity {
 
 
-    MarksFragment marksFragment = new MarksFragment();
+    MarksFragment marksFragment;
     AttendanceFragment attendanceFragment = new AttendanceFragment();
     BoardFragment boardFragment = new BoardFragment();
     LessonplanFragment lessonplanFragment = new LessonplanFragment();
@@ -68,6 +68,8 @@ public class DashboardActivity extends AppCompatActivity {
         super.onCreate(savedInstanceState);
         setContentView(R.layout.activity_dashboard);
 
+        marksFragment = new MarksFragment();
+
         setTitle(R.string.title_dashboard);
 
         BottomNavigationView navigation = (BottomNavigationView) findViewById(R.id.navigation);

app/src/main/java/io/github/wulkanowy/activity/dashboard/marks/ImageAdapter.java

@@ -0,0 +1,62 @@
+package io.github.wulkanowy.activity.dashboard.marks;
+
+import android.content.Context;
+import android.view.View;
+import android.view.ViewGroup;
+import android.widget.BaseAdapter;
+import android.widget.GridView;
+import android.widget.ImageView;
+
+import io.github.wulkanowy.R;
+
+public class ImageAdapter extends BaseAdapter {
+    private Context mContext;
+
+    public ImageAdapter(Context c) {
+        this.mContext = c;
+    }
+
+    public int getCount() {
+         return mThumbIds.length;
+    }
+
+    public Object getItem(int position) {
+        return null;
+    }
+
+    public long getItemId(int position) {
+        return 0;
+    }
+
+    // create a new ImageView for each item referenced by the Adapter
+    public View getView(int position, View convertView, ViewGroup parent) {
+        ImageView imageView;
+        if (convertView == null) {
+            // if it's not recycled, initialize some attributes
+            imageView = new ImageView(mContext);
+            imageView.setLayoutParams(new GridView.LayoutParams(85, 85));
+            imageView.setScaleType(ImageView.ScaleType.CENTER_CROP);
+            imageView.setPadding(8, 8, 8, 8);
+        } else {
+            imageView = (ImageView) convertView;
+        }
+
+        imageView.setImageResource(mThumbIds[position]);
+        return imageView;
+    }
+
+    // references to our images
+    private Integer[] mThumbIds = {
+            R.drawable.sample_2, R.drawable.sample_3,
+            R.drawable.sample_4, R.drawable.sample_5,
+            R.drawable.sample_6, R.drawable.sample_7,
+            R.drawable.sample_0, R.drawable.sample_1,
+            R.drawable.sample_2, R.drawable.sample_3,
+            R.drawable.sample_4, R.drawable.sample_5,
+            R.drawable.sample_6, R.drawable.sample_7,
+            R.drawable.sample_0, R.drawable.sample_1,
+            R.drawable.sample_2, R.drawable.sample_3,
+            R.drawable.sample_4, R.drawable.sample_5,
+            R.drawable.sample_6, R.drawable.sample_7
+    };
+}

app/src/main/java/io/github/wulkanowy/activity/dashboard/marks/MarksFragment.java

@@ -1,16 +1,30 @@
 package io.github.wulkanowy.activity.dashboard.marks;
 
 
+import android.app.Activity;
+import android.content.Context;
 import android.os.Bundle;
 import android.support.v4.app.Fragment;
 import android.view.LayoutInflater;
 import android.view.View;
 import android.view.ViewGroup;
+import android.widget.AdapterView;
+import android.widget.GridView;
+import android.widget.Toast;
+import android.widget.AdapterView.OnItemClickListener;
+
 
 import io.github.wulkanowy.R;
 
 public class MarksFragment extends Fragment {
 
+    Activity mActivity;
+    @Override
+    public void onAttach(Context context) {
+        super.onAttach(context);
+        mActivity = (Activity) context;
+    }
+
 
     public MarksFragment() {
     }
@@ -19,6 +33,18 @@ public class MarksFragment extends Fragment {
     @Override
     public View onCreateView(LayoutInflater inflater, ViewGroup container,
                              Bundle savedInstanceState) {
+
+        View view = inflater.inflate(R.layout.fragment_marks, container, false);
+
+        GridView gridview = (GridView) view.findViewById(R.id.gridview);
+        gridview.setAdapter(new ImageAdapter(mActivity));
+
+        gridview.setOnItemClickListener(new OnItemClickListener() {
+            public void onItemClick(AdapterView<?> parent, View v,
+                                    int position, long id) {
+                Toast.makeText(mActivity,"HALLO", Toast.LENGTH_SHORT).show();
+            }
+        });
         return inflater.inflate(R.layout.fragment_marks, container, false);
     }
 

app/src/main/java/io/github/wulkanowy/activity/started/LoadingTask.java

@@ -31,7 +31,7 @@ public class LoadingTask extends AsyncTask<Void, Void, Void> {
        /* Intent intent = new Intent(activity,MainActivity.class);
         activity.startActivity(intent); */
 
-        Intent intent = new Intent(activity,MainActivity.class);
+        Intent intent = new Intent(activity,DashboardActivity.class);
         activity.startActivity(intent);
     }
 }

app/src/main/res/layout/fragment_marks.xml

@@ -1,17 +1,18 @@
 <FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
-    xmlns:tools="http://schemas.android.com/tools"
-    android:layout_width="match_parent"
-    android:layout_height="match_parent"
-    tools:context="io.github.wulkanowy.activity.dashboard.marks.MarksFragment">
+xmlns:tools="http://schemas.android.com/tools"
+android:layout_width="match_parent"
+android:layout_height="match_parent"
+tools:context="io.github.wulkanowy.activity.dashboard.marks.MarksFragment">
 
-
-    <TextView
+    <GridView xmlns:android="http://schemas.android.com/apk/res/android"
+        android:id="@+id/gridview"
         android:layout_width="match_parent"
         android:layout_height="match_parent"
-        android:text="Fragment Oceny" />
-
-    <ExpandableListView
-        android:layout_width="match_parent"
-        android:layout_height="match_parent" />
+        android:columnWidth="90dp"
+        android:numColumns="auto_fit"
+        android:verticalSpacing="10dp"
+        android:horizontalSpacing="10dp"
+        android:gravity="center"
+        />
 
 </FrameLayout>