android 手动背光

Android中可以通过修改系统的Settings来实现手动调节背光的功能。首先，需要申请修改Settings的权限，即`<uses-permission android:name="android.permission.WRITE_SETTINGS"/>`。然后，需要取消光感自动调节屏幕亮度的功能，将其设置为手动调节模式。关闭光感、设置手动调节背光模式的方法如下：

public void setScreenManualMode(Context context) {
    ContentResolver contentResolver = context.getContentResolver();
    try {
        int mode = Settings.System.getInt(contentResolver, Settings.System.SCREEN_BRIGHTNESS_MODE);
        if (mode == Settings.System.SCREEN_BRIGHTNESS_MODE_AUTOMATIC) {
            Settings.System.putInt(contentResolver, Settings.System.SCREEN_BRIGHTNESS_MODE, Settings.System.SCREEN_BRIGHTNESS_MODE_MANUAL);
        }
    } catch (Settings.SettingNotFoundException e) {
        e.printStackTrace();
    }
}

此外，还可以通过修改当前Activity界面的窗口亮度或修改系统的亮度值来实现手动设置背光的效果。具体代码如下：

// 修改当前Activity界面的窗口亮度
private void setScreenLight(int brightness) {
    WindowManager.LayoutParams lp = getWindow().getAttributes();
    lp.screenBrightness = Float.valueOf(brightness) * (1f / 255f);
    getWindow().setAttributes(lp);
}

// 修改系统的亮度值
public void setScreenLight(int brightness) {
    Uri uri = Settings.System.getUriFor(Settings.System.SCREEN_BRIGHTNESS);
    ContentResolver contentResolver = getContentResolver();
    Settings.System.putInt(contentResolver, Settings.System.SCREEN_BRIGHTNESS, brightness);
    contentResolver.notifyChange(uri, null);
}

需要注意的是，非系统签名的应用需要引导用户手动授权修改Settings权限。在Android中，系统手动设置背光、待机休眠等功能是通过PowerManagerService.java统一管理，自动背光则是由AutomaticBrightnessController.java管理，最后统一调用DisplayPowerController.java进行处理。\[1\]\[2\]\[3\]
#### 引用[.reference_title]
- *1* [Android 修改屏幕背光方案](https://blog.csdn.net/wjky2014/article/details/100941278)[target="_blank" data-report-click={"spm":"1018.2226.3001.9630","extra":{"utm_source":"vip_chatgpt_common_search_pc_result","utm_medium":"distribute.pc_search_result.none-task-cask-2~all~insert_cask~default-1-null.142^v91^insertT0,239^v3^insert_chatgpt"}} ] [.reference_item]
- *2* *3* [Android 系统背光设置](https://blog.csdn.net/tq501501/article/details/109246686)[target="_blank" data-report-click={"spm":"1018.2226.3001.9630","extra":{"utm_source":"vip_chatgpt_common_search_pc_result","utm_medium":"distribute.pc_search_result.none-task-cask-2~all~insert_cask~default-1-null.142^v91^insertT0,239^v3^insert_chatgpt"}} ] [.reference_item]
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