How to operate above the GLsurfaceView

Hi I have read the question that CliffWoo has asked.He wants to make a videoView on GLSurfaceView.And I need to make some Button and textView on above the VideoView,too. So I used the solution that answered for CliffWoo. But when I want to do something else, I meet more question. I want to change the text in textView above the GLsurfaceView, when detect the aim image. so I write like this: [CODE] //in the QCARSampleActivity.java overlayView = View.inflate(QCARSampleActivity.this, R.layout.main, null); addContentView(overlayView, new LayoutParams( LayoutParams.FILL_PARENT, LayoutParams.FILL_PARENT)); mButton = (Button) overlayView.findViewById(R.id.Button01); overlayView.setVisibility(View.VISIBLE); //here mButton is a public member [/CODE] and in the ImageTargets.java， I do like these below in ImageTargetsRenderer.java [CODE] //in ImageTargetsRenderer.java private ImageTargets preTargets; public void onDrawFrame(GL10 gl){ if (!mIsActive) return; // Call our native function to render content Log.d("ImageTargets","detected"); mButton.setText("lol! I change the text in the button!!!"); } } public ImageTargetsRenderer(ImageTargets imageTarget){ super(); preTargets = imageTarget; } [/CODE] in the ImageTargets.java , I have already changed the Methods of Construction [CODE] protected QCARSampleRenderer createRenderer() { return new ImageTargetsRenderer(this); } [/CODE] But this time when I detected the aim image ,the programe closed , and the file named GLSurfaceView.class wil be open in Eclipse. And there is no error log in DDMS. I need your help to solve the Problem. many thanks~!:)