Added back button to download activity ActionBar

app/src/main/java/org/schabi/newpipe/download/MainActivity.java

@@ -11,8 +11,10 @@ import android.content.SharedPreferences;
 import android.os.AsyncTask;
 import android.os.Bundle;
 import android.os.IBinder;
+import android.support.v4.app.NavUtils;
 import android.support.v7.app.AppCompatActivity;
 import android.support.v7.widget.Toolbar;
+import android.util.Log;
 import android.view.LayoutInflater;
 import android.view.MenuItem;
 import android.view.View;
@@ -25,6 +27,8 @@ import android.widget.TextView;
 import android.widget.Toast;
 
 import org.schabi.newpipe.R;
+import org.schabi.newpipe.VideoItemDetailActivity;
+import org.schabi.newpipe.VideoItemListActivity;
 
 import java.io.File;
 import java.io.IOException;
@@ -45,6 +49,8 @@ public class MainActivity extends AppCompatActivity implements AdapterView.OnIte
 
     public static final String INTENT_LIST = "us.shandian.giga.intent.LIST";
 
+    private static final String TAG = MainActivity.class.toString();
+
     private MissionsFragment mFragment;
     private DownloadManager mManager;
     private DownloadManagerService.DMBinder mBinder;
@@ -81,10 +87,16 @@ public class MainActivity extends AppCompatActivity implements AdapterView.OnIte
         super.onCreate(savedInstanceState);
         setContentView(R.layout.activity_downloader);
 
+        try {
+            //noinspection ConstantConditions
+            getSupportActionBar().setDisplayHomeAsUpEnabled(true);
+        } catch(Exception e) {
+            Log.d(TAG, "Could not get SupportActionBar");
+            e.printStackTrace();
+        }
 
         mPrefs = getSharedPreferences("threads", Context.MODE_WORLD_READABLE);
 
-
         // Fragment
         getWindow().getDecorView().getViewTreeObserver().addOnGlobalLayoutListener(new ViewTreeObserver.OnGlobalLayoutListener() {
             @Override
@@ -100,7 +112,6 @@ public class MainActivity extends AppCompatActivity implements AdapterView.OnIte
         }
     }
 
-
     @Override
     protected void onNewIntent(Intent intent) {
         super.onNewIntent(intent);
@@ -128,7 +139,7 @@ public class MainActivity extends AppCompatActivity implements AdapterView.OnIte
                 .replace(R.id.frame, mFragment)
                 .setTransition(FragmentTransaction.TRANSIT_FRAGMENT_FADE)
                 .commit();
-
+        
     }
 
     private void showUrlDialog() {
@@ -277,4 +288,17 @@ public class MainActivity extends AppCompatActivity implements AdapterView.OnIte
 
     }
 
+    @Override
+    public boolean onOptionsItemSelected(MenuItem item) {
+        int id = item.getItemId();
+        if (id == android.R.id.home) {
+            Intent intent = new Intent(this, VideoItemDetailActivity.class);
+            intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
+            NavUtils.navigateUpTo(this, intent);
+            return true;
+        } else {
+            return false;
+        }
+    }
+
 }

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

@@ -1,4 +1,4 @@
-<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
+<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
 android:layout_width="match_parent"
 android:layout_height="match_parent"
 android:orientation="vertical">
@@ -8,11 +8,4 @@ android:orientation="vertical">
         android:layout_width="match_parent"
         android:layout_height="match_parent"/>
 
-    <FrameLayout
+</LinearLayout>
-        android:id="@+id/nav"
-        android:layout_gravity="left"
-        android:layout_width="240dp"
-        android:layout_height="match_parent">
-    </FrameLayout>
-
-</RelativeLayout>