Android Developer: How to show PopupWindow in android with background transparent when it show

In this tutorial we will make android popup which will show as drop-down window at particular view point.

Below is Activity class which use to make Popup window on button click.

public class PoupWindowActivity extends Activity implements OnClickListener{

 

 

 public Button mBtnPopUpWindow;

 

 private PopupWindow mPopupWindow;

 

 private Button mBtnCancel;

 

 @Override

 protected void onCreate(Bundle savedInstanceState) {

  // TODO Auto-generated method stub

  super.onCreate(savedInstanceState);

  

  setContentView(R.layout.main_screen_layout);

  

  initView();

 }



 

 

 private void initView(){

  

  mBtnPopUpWindow=(Button)findViewById(R.id.btn_popup);

  mBtnPopUpWindow.setOnClickListener(this);

  

  

 }







 @Override

 public void onClick(View v) {

  

  switch(v.getId()){

  

  

  case R.id.btn_popup:

   

   showPopupWindow();

   

   break;

   

  case R.id.btn_cancel:

   

   

   if(mPopupWindow!=null & mPopupWindow.isShowing()){

    mPopupWindow.dismiss();

    mPopupWindow=null;

   }

   break;

  }

 }

 

 

 private void showPopupWindow(){

  

  LayoutInflater mLayoutInflater=LayoutInflater.from(this);

  View mView=mLayoutInflater.inflate(R.layout.pop_up_layout, null);

  mPopupWindow=new PopupWindow(mView, LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT, true);

 // mPopupWindow=new PopupWindow(mView,,LayoutParams.WRAP_CONTENT);

  mPopupWindow.setContentView(mView);

  mBtnCancel=(Button) mView.findViewById(R.id.btn_cancel);

  mBtnCancel.setOnClickListener(this);

  Drawable d = new ColorDrawable(Color.WHITE);

        d.setAlpha(130);

      

  mPopupWindow.setBackgroundDrawable(new BitmapDrawable());

  

  mPopupWindow.showAsDropDown(mBtnPopUpWindow, 0, 0,Gravity.LEFT);

  getWindow().setBackgroundDrawable(d);

  mPopupWindow.setOnDismissListener(new OnDismissListener() {

   

   @Override

   public void onDismiss() {

    

    Drawable d = new ColorDrawable(Color.WHITE);

    

    getWindow().setBackgroundDrawable(d);

   }

  });

 }

 



}

Here are xml file use for Activity and Popup window layout.

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical" >

<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:gravity="right"
android:orientation="horizontal" >

<Button

style="?android:attr/buttonStyleSmall"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:text="@string/popupwindow"
android:id="@+id/btn_popup"
/>
</LinearLayout>

</LinearLayout>

Popup window xml:

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical"
android:paddingLeft="10dp"
android:paddingRight="10dp" >

<RelativeLayout
android:layout_width="match_parent"
android:layout_height="wrap_content" >

<ImageView
android:id="@+id/img_popup_arrow"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentRight="true"
android:layout_alignParentTop="true"
android:layout_marginRight="30dp"
android:scaleType="fitXY"
android:src="@drawable/ic_alerts_and_states_warning" />

<LinearLayout
android:layout_width="match_parent"
android:layout_height="20dp"
android:layout_below="@+id/img_popup_arrow"
android:background="@drawable/bg_orange_round" >
</LinearLayout>
</RelativeLayout>

<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="@drawable/bg_white_round"
android:orientation="vertical" >

<EditText
android:id="@+id/editxt_search"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:ems="10"
android:inputType="textPersonName" >

<requestFocus />
</EditText>

<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:gravity="right" >

<Button
android:id="@+id/btn_search"
style="?android:attr/buttonStyleSmall"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/search" />

<Button
android:id="@+id/btn_cancel"
style="?android:attr/buttonStyleSmall"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="right|center_vertical"
android:text="@string/cancel" />
</LinearLayout>
</LinearLayout>

</LinearLayout>

Here is output of our popup window: