Question

I am creating a brightness control dialog. However the problem I am having is that when I put textview then seekbar it causes this error:

android.widget.SeekBar cannot be cast to android.widget.TextView

For some reason it seems to work when the positioning on .xml follows seekbar then textview.

Here is some code:

LayoutInflater li_brightness = (LayoutInflater)this.getSystemService(LAYOUT_INFLATER_SERVICE);
            View v_brightness = li_brightness.inflate(R.layout.options_dialog_brightness, (ViewGroup)findViewById(R.id.ll_brightness_layout));
            bright_textView = (TextView)v_brightness.findViewById(R.id.brightness_text);
            brightBar = (SeekBar)v_brightness.findViewById(R.id.seekbar_brightness);
            confirm_brightness = (Button)v_brightness.findViewById(R.id.button_brightness);



            cResolver = getContentResolver();

            window = getWindow();

            brightBar.setMax(100);
            brightBar.setProgress(50);
            brightBar.setKeyProgressIncrement(1);

            bright_textView.setText("50".toString());


            brightBar.setOnSeekBarChangeListener(new OnSeekBarChangeListener() {

                public void onStopTrackingTouch(SeekBar seekBar) {
                    // TODO Auto-generated method stub

                }

                public void onStartTrackingTouch(SeekBar seekBar) {
                    // TODO Auto-generated method stub

                }

                public void onProgressChanged(SeekBar seekBar, int progress,
                        boolean fromUser) {
                    // TODO Auto-generated method stub
                    float BackLightValue = (float)progress/100;
                    if(BackLightValue <= 0){
                        bright_textView.setText(String.valueOf(BackLightValue));
                    }


                      WindowManager.LayoutParams layoutParams = getWindow().getAttributes();
                      layoutParams.screenBrightness = BackLightValue;
                      getWindow().setAttributes(layoutParams);
                }
            });

Answer 1

Try cleaning your project (Project > Clean from Eclipse or ant clean from the command line), and see if that clears up your problem. Sometimes the build system gets a bit out of sync with itself in terms of the R values, and this sort of error is one of the symptoms.