Update commons dialog usage im sample

sample/src/main/java/com/afollestad/materialdialogssample/MainActivity.java

@@ -25,8 +25,7 @@ import android.view.View;
 import android.widget.CheckBox;
 import android.widget.EditText;
 import android.widget.Toast;
-import butterknife.ButterKnife;
-import butterknife.OnClick;
+
 import com.afollestad.materialdialogs.DialogAction;
 import com.afollestad.materialdialogs.GravityEnum;
 import com.afollestad.materialdialogs.MaterialDialog;
@@ -41,8 +40,12 @@ import com.afollestad.materialdialogs.internal.ThemeSingleton;
 import com.afollestad.materialdialogs.simplelist.MaterialSimpleListAdapter;
 import com.afollestad.materialdialogs.simplelist.MaterialSimpleListItem;
 import com.afollestad.materialdialogs.util.DialogUtils;
+
 import java.io.File;
 
+import butterknife.ButterKnife;
+import butterknife.OnClick;
+
 /** @author Aidan Follestad (afollestad) */
 public class MainActivity extends AppCompatActivity
     implements FolderChooserDialog.FolderCallback,
@@ -542,7 +545,7 @@ public class MainActivity extends AppCompatActivity
     new ColorChooserDialog.Builder(this, R.string.color_palette)
         .titleSub(R.string.colors)
         .preselect(primaryPreselect)
-        .show(this);
+        .show();
   }
 
   @OnClick(R.id.colorChooser_accent)
@@ -551,7 +554,7 @@ public class MainActivity extends AppCompatActivity
         .titleSub(R.string.colors)
         .accentMode(true)
         .preselect(accentPreselect)
-        .show(this);
+        .show();
   }
 
   @OnClick(R.id.colorChooser_customColors)
@@ -582,7 +585,7 @@ public class MainActivity extends AppCompatActivity
         .titleSub(R.string.colors)
         .preselect(primaryPreselect)
         .customColors(R.array.custom_colors, subColors)
-        .show(this);
+        .show();
   }
 
   @OnClick(R.id.colorChooser_customColorsNoSub)
@@ -591,7 +594,7 @@ public class MainActivity extends AppCompatActivity
         .titleSub(R.string.colors)
         .preselect(primaryPreselect)
         .customColors(R.array.custom_colors, null)
-        .show(this);
+        .show();
   }
 
   // Receives callback from color chooser dialog
@@ -668,7 +671,7 @@ public class MainActivity extends AppCompatActivity
           STORAGE_PERMISSION_RC);
       return;
     }
-    new FileChooserDialog.Builder(this).show(this);
+    new FileChooserDialog.Builder(this).show();
   }
 
   @Override
@@ -697,7 +700,7 @@ public class MainActivity extends AppCompatActivity
     new FolderChooserDialog.Builder(MainActivity.this)
         .chooseButton(R.string.md_choose_label)
         .allowNewFolder(true, 0)
-        .show(this);
+        .show();
   }
 
   @Override