ndk/platforms/android-18/samples/Teapot/src/com/sample/teapot/TeapotNativeActivity.java

package com.sample.teapot;

import android.app.NativeActivity;
import android.os.Bundle;
import android.view.Gravity;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup.MarginLayoutParams;
import android.view.WindowManager.LayoutParams;
import android.widget.LinearLayout;
import android.widget.PopupWindow;
import android.widget.TextView;

public class TeapotNativeActivity extends NativeActivity {
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
    }

    protected void onResume() {
        super.onResume();

        //Hide toolbar
        int SDK_INT = android.os.Build.VERSION.SDK_INT;
        if(SDK_INT >= 11 && SDK_INT < 14) {
            getWindow().getDecorView().setSystemUiVisibility(View.STATUS_BAR_HIDDEN);
        }else if(SDK_INT >= 14){
            getWindow().getDecorView().setSystemUiVisibility(View.SYSTEM_UI_FLAG_FULLSCREEN | View.SYSTEM_UI_FLAG_LOW_PROFILE);
        }

    }

    // Our popup window, you will call it from your C/C++ code later

    TeapotNativeActivity _activity;
    PopupWindow _popupWindow;
    TextView _label;

    public void showUI()
    {
        if( _popupWindow != null )
            return;

        _activity = this;

        this.runOnUiThread(new Runnable()  {
            @Override
            public void run()  {
                LayoutInflater layoutInflater
                = (LayoutInflater)getBaseContext()
                .getSystemService(LAYOUT_INFLATER_SERVICE);
                View popupView = layoutInflater.inflate(R.layout.widgets, null);
                _popupWindow = new PopupWindow(
                        popupView,
                        LayoutParams.WRAP_CONTENT,
                        LayoutParams.WRAP_CONTENT);

                LinearLayout mainLayout = new LinearLayout(_activity);
                MarginLayoutParams params = new MarginLayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT);
                params.setMargins(0, 0, 0, 0);
                _activity.setContentView(mainLayout, params);

                // Show our UI over NativeActivity window
                _popupWindow.showAtLocation(mainLayout, Gravity.TOP | Gravity.LEFT, 10, 10);
                _popupWindow.update();

                _label = (TextView)popupView.findViewById(R.id.textViewFPS);

            }});
    }

    public void updateFPS(final float fFPS)
    {
        if( _label == null )
            return;

        _activity = this;
        this.runOnUiThread(new Runnable()  {
            @Override
            public void run()  {
                _label.setText(String.format("%2.2f FPS", fFPS));

            }});
    }
}