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   源码介绍

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package cn.nibiru.screenbright;

import android.Manifest;
import android.content.ContentResolver;
import android.content.Intent;
import android.net.Uri;
import android.os.Build;
import android.os.Bundle;
import android.provider.Settings;
import android.support.annotation.NonNull;
import android.support.v7.app.AppCompatActivity;
import android.view.WindowManager;
import android.widget.SeekBar;
import android.widget.Toast;

import com.yanzhenjie.permission.AndPermission;
import com.yanzhenjie.permission.PermissionListener;

import java.util.List;

public class MainActivity extends AppCompatActivity {

    private SeekBar sb;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        sb = (SeekBar) findViewById(R.id.sb);
        sb.setProgress(0);
        sb.setMax(255);

        //申请android.permission.WRITE_SETTINGS权限的方式
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
            //如果当前平台版本大于23平台
            if (!Settings.System.canWrite(this)) {
                //如果没有修改系统的权限这请求修改系统的权限
                Intent intent = new Intent(Settings.ACTION_MANAGE_WRITE_SETTINGS);
                intent.setData(Uri.parse("package:"   getPackageName()));
                intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
                startActivityForResult(intent, 0);
            } else {
                //有了权限，你要做什么呢？具体的动作
                processShow();
            }
        }


        //动态申请权限
        // 先判断是否有权限。
        if (AndPermission.hasPermission(this, Manifest.permission.WRITE_EXTERNAL_STORAGE)) {
            // 有权限，直接do anything.
            processShow();
        } else {
            // 申请权限。
            AndPermission.with(this)
                    .requestCode(100)
                    .permission(Manifest.permission.WRITE_EXTERNAL_STORAGE)
                    .send();
        }
    }

    @Override
    public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions,
                                           @NonNull int[] grantResults) {
        AndPermission.onRequestPermissionsResult(requestCode, permissions, grantResults, listener);
    }

    private PermissionListener listener = new PermissionListener() {
        @Override
        public void onSucceed(int requestCode, List<String> grantPermissions) {
            //权限申请成功回调
            if (requestCode == 100) {
                processShow();

            } else if (requestCode == 101) {
                Toast.makeText(MainActivity.this, "权限申请失败", Toast.LENGTH_SHORT).show();
            }
        }

        @Override
        public void onFailed(int requestCode, List<String> deniedPermissions) {
            //权限申请失败的回调
            if (AndPermission.hasAlwaysDeniedPermission(MainActivity.this, deniedPermissions)) {
                //第一种默认的提示语
                AndPermission.defaultSettingDialog(MainActivity.this, requestCode).show();
            }
        }
    };

    private void processShow() {
        sb.setOnSeekBarChangeListener(new SeekBar.OnSeekBarChangeListener() {
            @Override
            public void onProgressChanged(SeekBar seekBar, int progress, boolean fromUser) {
                setScreenBrightness(seekBar.getProgress());
            }

            @Override
            public void onStartTrackingTouch(SeekBar seekBar) {
            }

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

    /**
     * 设置屏幕的亮度
     */
    private void setScreenBrightness(int process) {

        //设置当前窗口的亮度值.这种方法需要权限android.permission.WRITE_EXTERNAL_STORAGE
        WindowManager.LayoutParams localLayoutParams = getWindow().getAttributes();
        float f = process / 255.0F;
        localLayoutParams.screenBrightness = f;
        getWindow().setAttributes(localLayoutParams);
        //修改系统的亮度值,以至于退出应用程序亮度保持
        saveBrightness(getContentResolver(),process);

    }
    public static void saveBrightness(ContentResolver resolver, int brightness) {
        //改变系统的亮度值(申请权限失败)
        //这里需要权限android.permission.WRITE_SETTINGS
        //设置为手动调节模式
        Settings.System.putInt(resolver, Settings.System.SCREEN_BRIGHTNESS_MODE,
                Settings.System.SCREEN_BRIGHTNESS_MODE_MANUAL);
        //保存到系统中
        Uri uri = android.provider.Settings.System.getUriFor(Settings.System.SCREEN_BRIGHTNESS);
        android.provider.Settings.System.putInt(resolver, Settings.System.SCREEN_BRIGHTNESS, brightness);
        resolver.notifyChange(uri, null);
    }
}