使用SeekBar控件来控制

布局文件：

 

Activity代码

1.设置SeekBar控件

SeekBar bar = (SeekBar) findViewById(R.id.brightness_bar);        bar.setOnSeekBarChangeListener(this);

2.继承 SeekBar.OnSeekBarChangeListener 接口

实现三个方法

@Override    public void onProgressChanged(SeekBar seekBar, int progress, boolean fromUser) {        int id = seekBar.getId();        Window window = getWindow();        switch (id){            //调整屏幕的亮度            case R.id.brightness_bar:                WindowManager.LayoutParams attributes = window.getAttributes();                attributes.screenBrightness = (float) (progress * 0.01);                window.setAttributes(attributes);                break;        }    }    @Override    public void onStartTrackingTouch(SeekBar seekBar) {    }    @Override    public void onStopTrackingTouch(SeekBar seekBar) {    }