Android 设置屏幕亮度_android 命令设置背光 settings

使用SeekBar调节屏幕亮度，代码如下：

    /**
     * 设置屏幕亮度
     */
    private void setBrighrnessSeekBar() {
        brightnessSeekBar = (SeekBar) findViewById(R.id.BrightnessSeekBar);
        brightnessSeekBar.setMax(255);
        brightnessSeekBar.setProgress((int) (android.provider.Settings.System.getInt(getContentResolver(), android.provider.Settings.System.SCREEN_BRIGHTNESS, 255)));
        brightnessSeekBar.setOnSeekBarChangeListener(new SeekBar.OnSeekBarChangeListener() {
            @Override
            public void onProgressChanged(SeekBar seekBar, int progress, boolean fromUser) {
                if (fromUser) {
                    Integer itg = brightnessSeekBar.getProgress();
//                    System.out.println("当前亮度------------------>"+itg+"____"+(itg*100/255));
                    //设置当前activity的屏幕亮度
                    WindowManager.LayoutParams lp = MySettings.this.getWindow().getAttributes();
                    //0到1,调整亮度暗到全亮
                    lp.screenBrightness = Float.valueOf(itg / 255f);
                    MySettings.this.getWindow().setAttributes(lp);
                    //保存为系统亮度
                    android.provider.Settings.System.putInt(getContentResolver(), android.provider.Settings.System.SCREEN_BRIGHTNESS, itg);

                }
            }

            public void onStartTrackingTouch(SeekBar seekBar) {
            }

            public void onStopTrackingTouch(SeekBar seekBar) {
            }
        });
    }
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