android.widget.SeekBar 无法转换为 android.widget.TextView

Question

我正在创建一个亮度控制对话框。然而，我遇到的问题是，当我将 textview 放在 seekbar 时，它会导致此错误:

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

出于某种原因，当 .xml 上的定位遵循 seekbar 然后是 textview 时，它似乎可以工作。

这是一些代码:

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

尝试清理您的项目(Project > Clean from Eclipse 或 ant clean 从命令行)，看看是否能解决您的问题。有时构建系统在 R 值方面与自身有点不同步，这种错误就是症状之一。