Q:

Set custom layout in popup window in android

I have a problem with popup window. I want to create popup window with my own layout. 
This is code:
public class PopupWindowView extends PopupWindow{

    PopupWindow popup;
    boolean click = true;
    LayoutParams params;
    RelativeLayout mainLayout;
    TextView tv;
    LinearLayout layout;
    ImageView chooseFlag;

    public void createPopupWindow(Activity act){
        popup = new PopupWindow(act);
        chooseFlag = (ImageView) act.findViewById(R.id.login_choose_flag);
        mainLayout = (RelativeLayout) act.findViewById(R.id.login_layout);
        tv = new TextView(act);
        layout = new LinearLayout(act);
        //layout = (LinearLayout) findViewById(R.id.popuplayout);
        chooseFlag.setOnClickListener(new OnClickListener() {

            @Override
            public void onClick(View v) {
                if (click) {
                    int[] values = new int[2]; 
                    v.getLocationOnScreen(values);
                    popup.showAtLocation(mainLayout, Gravity.NO_GRAVITY, 10, 10);
                    popup.update(values[0], values[1], 300, 80);
                    click = false;
                } else {
                    popup.dismiss();
                    click = true;
                }
            }
        });
        params = new LayoutParams(LayoutParams.WRAP_CONTENT,
                LayoutParams.WRAP_CONTENT);
        layout.setOrientation(LinearLayout.VERTICAL);
        tv.setText("Hi this is a sample text for popup window");
        layout.addView(tv, params);
        popup.setContentView(layout);
    }
}

and this is layout which I want to set in my popup window:
<?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" 
   >

    <LinearLayout
        android:id="@+id/popuplayout"
        android:layout_width="match_parent"
        android:layout_height="match_parent" 
        android:background="@color/patient_button_bg">
    </LinearLayout>

</LinearLayout>

In my class I can't use findbyid method because this is not Activity. How I can set my own layout in popup widow in my class?
Edit:
this is stack trace where I get error:
03-01 09:48:48.761: E/AndroidRuntime(16776): FATAL EXCEPTION: main
03-01 09:48:48.761: E/AndroidRuntime(16776): java.lang.IllegalStateException: The specified child already has a parent. You must call removeView() on the child's parent first.
03-01 09:48:48.761: E/AndroidRuntime(16776):    at android.view.ViewGroup.addViewInner(ViewGroup.java:3337)
03-01 09:48:48.761: E/AndroidRuntime(16776):    at android.view.ViewGroup.addView(ViewGroup.java:3208)
03-01 09:48:48.761: E/AndroidRuntime(16776):    at android.view.ViewGroup.addView(ViewGroup.java:3188)
03-01 09:48:48.761: E/AndroidRuntime(16776):    at android.widget.PopupWindow.preparePopup(PopupWindow.java:969)
03-01 09:48:48.761: E/AndroidRuntime(16776):    at android.widget.PopupWindow.showAtLocation(PopupWindow.java:840)
03-01 09:48:48.761: E/AndroidRuntime(16776):    at android.widget.PopupWindow.showAtLocation(PopupWindow.java:813)
03-01 09:48:48.761: E/AndroidRuntime(16776):    at pl.asseco.amms.mobile.tools.PopupWindowView$1.onClick(PopupWindowView.java:44)
03-01 09:48:48.761: E/AndroidRuntime(16776):    at android.view.View.performClick(View.java:3558)
03-01 09:48:48.761: E/AndroidRuntime(16776):    at android.view.View$PerformClick.run(View.java:14152)
03-01 09:48:48.761: E/AndroidRuntime(16776):    at android.os.Handler.handleCallback(Handler.java:605)
03-01 09:48:48.761: E/AndroidRuntime(16776):    at android.os.Handler.dispatchMessage(Handler.java:92)
03-01 09:48:48.761: E/AndroidRuntime(16776):    at android.os.Looper.loop(Looper.java:137)
03-01 09:48:48.761: E/AndroidRuntime(16776):    at android.app.ActivityThread.main(ActivityThread.java:4514)
03-01 09:48:48.761: E/AndroidRuntime(16776):    at java.lang.reflect.Method.invokeNative(Native Method)
03-01 09:48:48.761: E/AndroidRuntime(16776):    at java.lang.reflect.Method.invoke(Method.java:511)
03-01 09:48:48.761: E/AndroidRuntime(16776):    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:790)
03-01 09:48:48.761: E/AndroidRuntime(16776):    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:557)
03-01 09:48:48.761: E/AndroidRuntime(16776):    at dalvik.system.NativeStart.main(Native Method)

Edit 
Activity which use popup:
@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_login);
    getActionBar().hide();

    mainMenuGenerator = new MainMenuGenerator();
    mainMenuGenerator.generateMainMenu(this);
    mainMenuGenerator.hideIcons();
    popup = new PopupWindowView();

    popup.createPopupWindow(this);

}

A:

try this code:
private void showSortPopup(final Activity context, Point p) 
{
       // Inflate the popup_layout.xml
       LinearLayout viewGroup = (LinearLayout) context.findViewById(R.id.llSortChangePopup);
       LayoutInflater layoutInflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
       View layout = layoutInflater.inflate(R.layout.sort_popup_layout, viewGroup);

       // Creating the PopupWindow
       changeSortPopUp = new PopupWindow(context);
       changeSortPopUp.setContentView(layout);
       changeSortPopUp.setWidth(LinearLayout.LayoutParams.WRAP_CONTENT);
       changeSortPopUp.setHeight(LinearLayout.LayoutParams.WRAP_CONTENT);
       changeSortPopUp.setFocusable(true);

       // Some offset to align the popup a bit to the left, and a bit down, relative to button's position.
       int OFFSET_X = -20;
       int OFFSET_Y = 95;

       // Clear the default translucent background
       changeSortPopUp.setBackgroundDrawable(new BitmapDrawable());

       // Displaying the popup at the specified location, + offsets.
       changeSortPopUp.showAtLocation(layout, Gravity.NO_GRAVITY, p.x + OFFSET_X, p.y + OFFSET_Y);

       // Getting a reference to Close button, and close the popup when clicked.
       Button close = (Button) layout.findViewById(R.id.close);
       close.setOnClickListener(new OnClickListener() {

         @Override
         public void onClick(View v) {
           changeSortPopUp.dismiss();
         }
       });

}

A:

You can use following code. you need to use PopupWindow for this.   
PopupWindow mpopup;   

then you need to inflate your view.   
    View popUpView = getLayoutInflater().inflate(R.layout.activity_login,
            null); // inflating popup layout
    mpopup = new PopupWindow(popUpView, LayoutParams.FILL_PARENT,
            LayoutParams.WRAP_CONTENT, true); // Creation of popup
    mpopup.setAnimationStyle(android.R.style.Animation_Dialog);
    mpopup.showAtLocation(popUpView, Gravity.CENTER, 0, 0); // Displaying popup  

if your layout have some item then you need bind that item with your view.  
    TextView some = (TextView) popUpView.findViewById(R.id.some);       
    Button btnCancel = (Button) popUpView.findViewById(R.id.btnCancel);  

onClickListener of your popup windows item.  
    btnCancel.setOnClickListener(new OnClickListener() {
        @Override
        public void onClick(View v) {
            mpopup.dismiss();
        }
    });   

You can dismiss your PopupWindow using mpopup.dismiss();

A:

You can use LayoutInflater
LayoutInflater inflater = (LayoutInflater) act.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
View view = inflater.inflate(R.layout.custom_layout, null); //custom_layout is your xml file which contains popuplayout
LinearLayout layout = (LinearLayout) view.findViewById(R.id.popuplayout);

