Drag & drop elements in ADVANCED

Drag & drop elements in ADVANCED

Today we are discussing about the drag & drop elements in ADVANCED.In the bellow figure show the elements in ADVANCED.

requestFocus & View

• The class in view represents basic building blocks for the user interface.

• A view is responsible  for event handling and drawing.

• View is used to create interactive UI components.

• The default code is given bellow.

    <requestFocus />

    <View

        android:id="@+id/view1"

        android:layout_width="wrap_content"

        android:layout_height="wrap_content" />

ViewStub

• A ViewStub is used to inflate layout resources at runtime.

• A ViewStub is becoming visible  when inflate() is invoked.

• The default code is given bellow.

<ViewStub
        android:id="@+id/viewStub1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content" 
/>

GestureOverlayView

• GestureOverlayView  is a transparency overlay for giving input that is placed on the top of other widgets.

• The default code is given bellow.

      <android.gesture.GestureOverlayView

        android:id="@+id/gestureOverlayView1"

        android:layout_width="wrap_content"

        android:layout_height="wrap_content" >

    </android.gesture.GestureOverlayView>

SurfaceView

• SurfaceView is used to provide a dedicated surface for drawing  embedded inside of a view.
• The default code is given bellow.

   <SurfaceView

        android:id="@+id/surfaceView1"

        android:layout_width="wrap_content"

        android:layout_height="wrap_content" 

   />

ZoomButton

• ZoomButton is used to zooming anything depends on the place where it is placed/

• The default code is given bellow.

   <ZoomButton

        android:id="@+id/zoomButton1"

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:src="@android:drawable/btn_plus"

   />

    

ZoomControls

• ZoomControls is used for both zoom in and zoom out.

• It is mainly used in image applications.

• The default code is given bellow.

      <ZoomControls

        android:id="@+id/zoomControls1"

        android:layout_width="wrap_content"

        android:layout_height="wrap_content" 

    />

DialFilter

• The deafult code is shown bellow.

    <DialerFilter

        android:id="@+id/dialerFilter1"

        android:layout_width="match_parent"

        android:layout_height="wrap_content" >

        <EditText

            android:id="@android:id/hint"

            android:layout_width="match_parent"

            android:layout_height="wrap_content"

            android:text="Hint" >

            <requestFocus />

        </EditText>

        <EditText

            android:id="@android:id/primary"

            android:layout_width="match_parent"

            android:layout_height="wrap_content"

            android:layout_below="@android:id/hint"

            android:text="Primary" />

    </DialerFilter>

TwoLineItemList

• A view group with two children is used in ListViews.

• The default code is given bellow.

   <TwoLineListItem

        android:id="@+id/twoLineListItem1"

        android:layout_width="wrap_content"

        android:layout_height="wrap_content" 

  />

AbsoluteLayout

• An absolute layout is used to specify locations of its childrens

• It is less flexible and hard to maintain.

• The default code is given bellow.

  <AbsoluteLayout

        android:id="@+id/absoluteLayout1"

        android:layout_width="match_parent"

        android:layout_height="wrap_content" >

    </AbsoluteLayout>