前言：
1.获取当前系统屏幕亮度
2.修改app屏幕亮度，仅对当前app有效。-可用在出示二维码界面，需要单个界面提高亮度时使用
3.修改系统屏幕亮度，所有app有效。Android 6.0 以上需要动态申请权限
实现：
1.权限
<uses-permission android:name="android.permission.WRITE_SETTINGS"tools:ignore="ProtectedPermissions" />
2.动态申请
/*** 非系统签名应用，引导用户手动授权修改Settings 权限**/private static final int REQUEST_CODE_WRITE_SETTINGS = 1000;@RequiresApi(api = Build.VERSION_CODES.M)private void initPermission() {// Settings.System.canWrite(MainActivity.this)// 检测是否拥有写入系统 Settings 的权限if (!Settings.System.canWrite(MainActivity5.this)) {AlertDialog.Builder builder = new AlertDialog.Builder(this);builder.setTitle("请开启修改屏幕亮度权限");builder.setMessage("请点击允许开启");// 拒绝, 无法修改builder.setNegativeButton("拒绝",new DialogInterface.OnClickListener() {@Overridepublic void onClick(DialogInterface dialog, int which) {Toast.makeText(MainActivity5.this, "您已拒绝修系统Setting的屏幕亮度权限", Toast.LENGTH_SHORT).show();}});builder.setPositiveButton("去开启",new DialogInterface.OnClickListener() {@Overridepublic void onClick(DialogInterface dialog, int which) {// 打开允许修改Setting 权限的界面Intent intent = new Intent(Settings.ACTION_MANAGE_WRITE_SETTINGS, Uri.parse("package:" + getPackageName()));startActivityForResult(intent,REQUEST_CODE_WRITE_SETTINGS);}});builder.setCancelable(false);builder.show();}}@Overrideprotected void onActivityResult(int requestCode, int resultCode, @Nullable Intent data) {super.onActivityResult(requestCode, resultCode, data);if (requestCode == REQUEST_CODE_WRITE_SETTINGS) {if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {// Settings.System.canWrite方法检测授权结果if (Settings.System.canWrite(getApplicationContext())) {//授权通过} else {Toast.makeText(MainActivity5.this, "您已拒绝修系统Setting的屏幕亮度权限",Toast.LENGTH_SHORT).show();}}}}
3.获取系统屏幕亮度（如果不需要修改系统屏幕亮度的话不需要申请权限）
/*** 获取app屏幕亮度** @param activity* @return*/public static int getScreenBrightness(Activity activity) {int value = 0;ContentResolver cr = activity.getContentResolver();try {value = Settings.System.getInt(cr, Settings.System.SCREEN_BRIGHTNESS);} catch (Settings.SettingNotFoundException e) {}return value;}
4.设置app屏幕亮度（仅对当前app有效，不需要申请权限）
/*** 设置app屏幕亮度** @param activity* @param value*/public static void setScreenBrightness(Activity activity, int value) {WindowManager.LayoutParams params = activity.getWindow().getAttributes();params.screenBrightness = value / 255f;activity.getWindow().setAttributes(params);}
5.修改系统屏幕亮度（Android 6.0 以上必须动态申请权限）
findViewById(R.id.mBtn_set_system).setOnClickListener(new View.OnClickListener() {@Overridepublic void onClick(View view) {//关闭光感setScreenManualMode(MainActivity5.this);//设置系统屏幕亮度ModifySettingsScreenBrightness(MainActivity5.this, 100);}});/*** 关闭光感，设置手动调节背光模式* SCREEN_BRIGHTNESS_MODE_AUTOMATIC 自动调节屏幕亮度模式值为1* SCREEN_BRIGHTNESS_MODE_MANUAL 手动调节屏幕亮度模式值为0**/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();}}/*** 修改Setting 中屏幕亮度值 亮度 0-255* 修改Setting的值需要动态申请权限 <uses-permission* android:name="android.permission.WRITE_SETTINGS"/>**/private void ModifySettingsScreenBrightness(Context context, int birghtessValue) {// 首先需要设置为手动调节屏幕亮度模式setScreenManualMode(context);ContentResolver contentResolver = context.getContentResolver();Settings.System.putInt(contentResolver, Settings.System.SCREEN_BRIGHTNESS, birghtessValue);}
如果觉得《Android 获取及修改屏幕亮度》对你有帮助，请点赞、收藏，并留下你的观点哦！
