前言：
之前調整權限的方式請看這裡。這次調用權限的方式比較不一樣。看圖吧！
權限使用：
請參考這篇：https://yanlu.me/android-m6-0-permission-chasm/
以下全部複製。
這是WRITE_SETTINGS權限的使用方式。
記得先在manifest內增加權限
<uses-permission android:name="android.permission.WRITE_SETTINGS"/>
/**
* An app can use this method to check if it is currently allowed to write or modify system
* settings. In order to gain write access to the system settings, an app must declare the
* {@link android.Manifest.permission#WRITE_SETTINGS} permission in its manifest. If it is
* currently disallowed, it can prompt the user to grant it this capability through a
* management UI by sending an Intent with action
* {@link android.provider.Settings#ACTION_MANAGE_WRITE_SETTINGS}.
*
* @param context A context
* @return true if the calling app can write to system settings, false otherwise
*/
if(!Settings.System.canWrite(this)){
Intent intent = new Intent(Settings.ACTION_MANAGE_WRITE_SETTINGS,
Uri.parse("package:" + getPackageName()));
startActivityForResult(intent, REQUEST_CODE);
}
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
if (requestCode == REQUEST_CODE) {
if (Settings.System.canWrite(this)) {
//检查返回结果
Toast.makeText(MainActivity.this, "WRITE_SETTINGS permission granted", Toast.LENGTH_SHORT).show();
} else {
Toast.makeText(MainActivity.this, "WRITE_SETTINGS permission not granted", Toast.LENGTH_SHORT).show();
}
}
}
其中比較需要注意的地方是Settings.System.canWrite這方法在太低版本的Android上面不適用。調用會Crash。
所以我們稍加做了一些判斷。
if (Build.VERSION.SDK_INT > Build.VERSION_CODES.M) {//android6.0以上使用需要權限
if (!Settings.System.canWrite(context)) {//沒有給予權限的話Do Something
//跳轉畫面到權限頁面給使用者勾選
Intent intent = new Intent(Settings.ACTION_MANAGE_WRITE_SETTINGS,
Uri.parse("package:" + getPackageName()));
startActivityForResult(intent, 9487);
} else {//已有權限 Do Something
start_bRight();//開始調整螢幕
}
} else {//android6.0以下可直接調用
start_bRight();//開始調整螢幕
}
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
switch (requestCode) {
case 9487:
if (Build.VERSION.SDK_INT > Build.VERSION_CODES.M) {
if (Settings.System.canWrite(this)) {
start_bRight();//開始調整螢幕
} else {
Toast.makeText(MainActivity.this, "請給予權限。", Toast.LENGTH_SHORT).show();
}
} else {
start_bRight();//開始調整螢幕
}
break;
}
}
使用
Build.VERSION.SDK_INT > Build.VERSION_CODES.M
來判斷是否Android的版本為SDK 23以上，如果是23以下就沒有權限問題，也可以順利調用Settings.System.canWrite方法。
調整亮度Code：
裡面帶有SeekBar參數。 //調整螢幕亮度
private void start_bRight() {
//設定最大值
SeekBar m_SeekBar = (SeekBar) findViewById(R.id.see_bar);
m_SeekBar.setMax(255);
//取得目前系統的亮度值
int brightness = android.provider.Settings.System.getInt(getContentResolver(), android.provider.Settings.System.SCREEN_BRIGHTNESS, 255);
Log.w(TAG, "亮度 素質" + brightness);
//將亮度值 射定道系統中
m_SeekBar.setProgress(brightness);
//關閉自動調整亮度功能
Settings.System.putInt(this.getContentResolver(), Settings.System.SCREEN_BRIGHTNESS_MODE, Settings.System.SCREEN_BRIGHTNESS_MODE_MANUAL);
/*
* @param cr要訪問的ContentResolver。
* @param name要修改的設置的名稱。
* @param value設置的新值。
*/
//設定SeeBar的監聽事件
m_SeekBar.setOnSeekBarChangeListener(new SeekBar.OnSeekBarChangeListener() {
@Override
public void onProgressChanged(SeekBar seekBar, int progress, boolean fromUser) {
//觀察目前系統的亮度值
int brightness = android.provider.Settings.System.getInt(getContentResolver(), android.provider.Settings.System.SCREEN_BRIGHTNESS, 255);
Log.w(TAG, "觀察亮度 素質" + brightness);
//針對App端的UI作為 螢幕亮度調整
// (假設App端調整最暗，)
Window localWindow = getWindow();
WindowManager.LayoutParams localLayoutParams = localWindow.getAttributes();
localLayoutParams.screenBrightness = progress / 255.0f;
localWindow.setAttributes(localLayoutParams);
//如果想改變整個系統的亮度
//方法1：
// Uri uri = android.provider.Settings.System.getUriFor("screen_brightness");
// android.provider.Settings.System.putInt(context.getContentResolver(), getContentResolver(), progress);
// context.getContentResolver().notifyChange(uri, null);
//方法2：
android.provider.Settings.System.putInt(getContentResolver(), android.provider.Settings.System.SCREEN_BRIGHTNESS, progress);
/*補充：android.provider.Settings.System.putInt(參數1，參數2，參數3);
*
*參數1：需要一個ContentResolver ，所以getContentResolver()
*參數2：其實就是一個字串，"screen_brightness"，但是這個類別中已經有final String 位置在→ android.provider.Settings.System.SCREEN_BRIGHTNESS
*參數3：設定的值
*
* */
}
@Override
public void onStartTrackingTouch(SeekBar seekBar) {
}
@Override
public void onStopTrackingTouch(SeekBar seekBar) {
}
});
}
這裡還有另外一些調整亮度的方式。如果你要進入畫面直接最亮可以嘗試以下方法
【Android開發經驗】與屏幕亮度調節相關的各種方法整理
public class SystemManager {
private Context mContext;
private static SystemManager sInstance;
private SystemManager(final Context context) {
mContext = context;
}
public static SystemManager init(final Context context) {
if (null == sInstance) {
sInstance = new SystemManager(context);
}
return sInstance;
}
public static SystemManager getInstance() {
return sInstance;
}
// 判斷是否是自動調光模式
public boolean isAutoBrightness() {
boolean automicBrightness = false;
try {
ContentResolver resolver = mContext.getContentResolver();
automicBrightness = Settings.System.getInt(resolver,
Settings.System.SCREEN_BRIGHTNESS_MODE) == Settings.System.SCREEN_BRIGHTNESS_MODE_AUTOMATIC;
} catch (SettingNotFoundException e) {
e.printStackTrace();
}
return automicBrightness;
}
// 設置屏幕亮度
public void setBrightness(Activity activity, int brightness) {
WindowManager.LayoutParams lp = activity.getWindow().getAttributes();
lp.screenBrightness = Float.valueOf(brightness) * (1f / 255f);
activity.getWindow().setAttributes(lp);
}
// 保存屏幕亮度
public void saveBrightness(int brightness) {
ContentResolver resolver = mContext.getContentResolver();
Uri uri = android.provider.Settings.System
.getUriFor("screen_brightness");
android.provider.Settings.System.putInt(resolver, "screen_brightness",
brightness);
resolver.notifyChange(uri, null);
}
// 開啟自動調光模式
public void startAutoBrightness() {
ContentResolver resolver = mContext.getContentResolver();
Settings.System.putInt(resolver,
Settings.System.SCREEN_BRIGHTNESS_MODE,
Settings.System.SCREEN_BRIGHTNESS_MODE_AUTOMATIC);
Uri uri = android.provider.Settings.System
.getUriFor("screen_brightness");
resolver.notifyChange(uri, null);
}
// 關閉自動調光模式
public void stopAutoBrightness() {
ContentResolver resolver = mContext.getContentResolver();
Settings.System.putInt(resolver,
Settings.System.SCREEN_BRIGHTNESS_MODE,
Settings.System.SCREEN_BRIGHTNESS_MODE_MANUAL);
Uri uri = android.provider.Settings.System
.getUriFor("screen_brightness");
resolver.notifyChange(uri, null);
}
// 獲得當前屏幕亮度
public int getScreenBrightness() {
int nowBrightnessValue = 0;
try {
ContentResolver resolver = mContext.getContentResolver();
nowBrightnessValue = android.provider.Settings.System.getInt(
resolver, Settings.System.SCREEN_BRIGHTNESS);
} catch (Exception e) {
e.printStackTrace();
}
return nowBrightnessValue;
}
// 設置光亮模式
public void setBrightnessMode(int mode) {
Settings.System.putInt(mContext.getContentResolver(),
Settings.System.SCREEN_BRIGHTNESS_MODE, mode);
}
// 獲得亮度模式
public int getBrightnessMode() {
try {
return Settings.System.getInt(mContext.getContentResolver(),
Settings.System.SCREEN_BRIGHTNESS_MODE);
} catch (SettingNotFoundException e) {
return Settings.System.SCREEN_BRIGHTNESS_MODE_AUTOMATIC;
}
}
//調到最亮 0~255 最暗~最亮
Settings.System.putInt(getContentResolver(), Settings.System.SCREEN_BRIGHTNESS, 255);
}
Demo：
https://dl.dropboxusercontent.com/s/hcv9hqoaudd8wuk/ScreenBright.7z
