一:只改变当前程序android屏幕亮度
(1)方法:
lp.screenBrightness 取值 0.0 -- 1.0 ※设定值(float)的范围,默认小于 0(系统设定)、0.0(暗)~1.0(亮) ※调用处理的地方,例如, Activity.onCreate()等等
代码:
WindowManager.LayoutParams lp = getWindow().getAttributes();
lp.screenBrightness = 1.0f;
getWindow().setAttributes(lp);
(2)恢复
(3)最小亮度
当离开当前Acitivity时,屏幕亮度会恢复到原先的亮度。另外将lp.screenBrightness 设为 -1(WindowManager.LayoutParams.BRIGHTNESS_OVERRIDE_NONE),也会让屏幕恢复到原先的亮度(即系统设置)。
(3)最小亮度
WindowManager.LayoutParams.BRIGHTNESS_OVERRIDE_NONE,官方文档说这个值可以将屏幕亮度设置到最低亮度(Lowest Brightness)。实际意识是将屏幕设置到全黑,屏幕也无法响应触控了。
在G3(CM6)上,将屏幕设置到最低亮度值是0.004(精度0.001),这时屏幕基本全黑,但仍能控制。低于0.004(精度0.001)时,屏幕便失去控制。0.01也是个要记录的值,屏幕亮度足够低,当仍能看到东西。这些值应该是和设备有关的,不能乱设。
二、全局亮度(修改手机系统亮度)
(1)说明:
Settings.System.putInt(getContentResolver(), Settings.System.SCREEN_BRIGHTNESS, bright);
(2)代码说明:
(1)说明:
Settings.System.putInt(getContentResolver(), Settings.System.SCREEN_BRIGHTNESS, bright);
可以改变全局亮度,但要让它生效可能需要,将模式改为手动
Settings.System.putInt(getContentResolver(),Settings.System.SCREEN_BRIGHTNESS_MODE, Settings.System.SCREEN_BRIGHTNESS_MODE_MANUAL);
要调用这些API,需要权限:
<uses-permission android:name="android.permission.WRITE_SETTINGS"/> (2)代码说明:
Android的屏幕亮度好像在2.1+的时候提供了自动调节的功能,所以,如果当开启自动调节功能的时候, 我们进行调节好像是没有一点作用的,这点让我很是无语,结果只有进行判断,看是否开启了屏幕亮度的自动调节功能。
/**
* 判断是否开启了自动亮度调节
*
* @param aContext
* @return
*/
public static boolean isAutoBrightness(ContentResolver aContentResolver) {
boolean automicBrightness = false;
try {
automicBrightness = Settings.System.getInt(aContentResolver,
Settings.System.SCREEN_BRIGHTNESS_MODE) == Settings.System.SCREEN_BRIGHTNESS_MODE_AUTOMATIC;
} catch (SettingNotFoundException e) {
e.printStackTrace();
}
return automicBrightness;
}
* 判断是否开启了自动亮度调节
*
* @param aContext
* @return
*/
public static boolean isAutoBrightness(ContentResolver aContentResolver) {
boolean automicBrightness = false;
try {
automicBrightness = Settings.System.getInt(aContentResolver,
Settings.System.SCREEN_BRIGHTNESS_MODE) == Settings.System.SCREEN_BRIGHTNESS_MODE_AUTOMATIC;
} catch (SettingNotFoundException e) {
e.printStackTrace();
}
return automicBrightness;
}
然后就是要觉得当前的亮度了,这个就比较纠结了:
/**
* 获取屏幕的亮度
*
* @param activity
* @return
*/
public static int getScreenBrightness(Activity activity) {
int nowBrightnessValue = 0;
ContentResolver resolver = activity.getContentResolver();
try {
nowBrightnessValue = android.provider.Settings.System.getInt(
resolver, Settings.System.SCREEN_BRIGHTNESS);
} catch (Exception e) {
e.printStackTrace();
}
return nowBrightnessValue;
}
* 获取屏幕的亮度
*
* @param activity
* @return
*/
public static int getScreenBrightness(Activity activity) {
int nowBrightnessValue = 0;
ContentResolver resolver = activity.getContentResolver();
try {
nowBrightnessValue = android.provider.Settings.System.getInt(
resolver, Settings.System.SCREEN_BRIGHTNESS);
} catch (Exception e) {
e.printStackTrace();
}
return nowBrightnessValue;
}
那如何修改屏幕的亮度呢?
/**
* 设置亮度
*
* @param activity
* @param brightness
*/
public static void setBrightness(Activity activity, int brightness) {
// Settings.System.putInt(activity.getContentResolver(),
// Settings.System.SCREEN_BRIGHTNESS_MODE,
// Settings.System.SCREEN_BRIGHTNESS_MODE_MANUAL);
WindowManager.LayoutParams lp = activity.getWindow().getAttributes();
lp.screenBrightness = Float.valueOf(brightness) * (1f / 255f);
activity.getWindow().setAttributes(lp);
}
* 设置亮度
*
* @param activity
* @param brightness
*/
public static void setBrightness(Activity activity, int brightness) {
// Settings.System.putInt(activity.getContentResolver(),
// Settings.System.SCREEN_BRIGHTNESS_MODE,
// Settings.System.SCREEN_BRIGHTNESS_MODE_MANUAL);
WindowManager.LayoutParams lp = activity.getWindow().getAttributes();
lp.screenBrightness = Float.valueOf(brightness) * (1f / 255f);
activity.getWindow().setAttributes(lp);
}
那么,能设置了,但是为什么还是会出现,设置了,没反映呢?
嘿嘿,那是因为,开启了自动调节功能了,那如何关闭呢?这才是最重要的:
/**
* 停止自动亮度调节
*
* @param activity
*/
public static void stopAutoBrightness(Activity activity) {
Settings.System.putInt(activity.getContentResolver(),
Settings.System.SCREEN_BRIGHTNESS_MODE,
Settings.System.SCREEN_BRIGHTNESS_MODE_MANUAL);
}
* 停止自动亮度调节
*
* @param activity
*/
public static void stopAutoBrightness(Activity activity) {
Settings.System.putInt(activity.getContentResolver(),
Settings.System.SCREEN_BRIGHTNESS_MODE,
Settings.System.SCREEN_BRIGHTNESS_MODE_MANUAL);
}
能开启,那自然应该能关闭了哟哟,那怎么关闭呢?很简单的:
/**
* 开启亮度自动调节
*
* @param activity
*/
public static void startAutoBrightness(Activity activity) {
Settings.System.putInt(activity.getContentResolver(),
Settings.System.SCREEN_BRIGHTNESS_MODE,
Settings.System.SCREEN_BRIGHTNESS_MODE_AUTOMATIC);
}
* 开启亮度自动调节
*
* @param activity
*/
public static void startAutoBrightness(Activity activity) {
Settings.System.putInt(activity.getContentResolver(),
Settings.System.SCREEN_BRIGHTNESS_MODE,
Settings.System.SCREEN_BRIGHTNESS_MODE_AUTOMATIC);
}
至此,应该说操作亮度的差不多都有了,结束!
哎,本来认为是应该结束了,但是悲剧得是,既然像刚才那样设置的话,只能在当前的activity中有作用,一段退出的时候,会发现毫无作用,悲剧,原来是忘记了保存了。
/**
* 保存亮度设置状态
*
* @param resolver
* @param brightness
*/
public static void saveBrightness(ContentResolver resolver, int brightness) {
Uri uri = android.provider.Settings.System
.getUriFor("screen_brightness");
android.provider.Settings.System.putInt(resolver, "screen_brightness",
brightness);
// resolver.registerContentObserver(uri, true, myContentObserver);
resolver.notifyChange(uri, null);
}
* 保存亮度设置状态
*
* @param resolver
* @param brightness
*/
public static void saveBrightness(ContentResolver resolver, int brightness) {
Uri uri = android.provider.Settings.System
.getUriFor("screen_brightness");
android.provider.Settings.System.putInt(resolver, "screen_brightness",
brightness);
// resolver.registerContentObserver(uri, true, myContentObserver);
resolver.notifyChange(uri, null);
}
这回该差不多了。
来自:http://www.apkbus.com/android-89276-1-1.html
+++++++++++++++++++++++++++++++++++++++++
封装成类:
package android.lekko.tools;
import android.app.Activity;
import android.content.ContentResolver;
import android.provider.Settings;
import android.provider.Settings.System;
import android.view.WindowManager;
import android.widget.Toast;
public class LightnessControl {
// 判断是否开启了自动亮度调节
public static boolean isAutoBrightness(Activity act) {
boolean automicBrightness = false;
ContentResolver aContentResolver = act.getContentResolver();
try {
automicBrightness = Settings.System.getInt(aContentResolver,
Settings.System.SCREEN_BRIGHTNESS_MODE) == Settings.System.SCREEN_BRIGHTNESS_MODE_AUTOMATIC;
} catch (Exception e) {
Toast.makeText(act,"无法获取亮度",Toast.LENGTH_SHORT).show();
}
return automicBrightness;
}
// 改变亮度
public static void SetLightness(Activity act,int value)
{
try {
System.putInt(act.getContentResolver(),System.SCREEN_BRIGHTNESS,value);
WindowManager.LayoutParams lp = act.getWindow().getAttributes();
lp.screenBrightness = (value<=0?1:value) / 255f;
act.getWindow().setAttributes(lp);
} catch (Exception e) {
Toast.makeText(act,"无法改变亮度",Toast.LENGTH_SHORT).show();
}
}
// 获取亮度
public static int GetLightness(Activity act)
{
return System.getInt(act.getContentResolver(),System.SCREEN_BRIGHTNESS,-1);
}
// 停止自动亮度调节
public static void stopAutoBrightness(Activity activity) {
Settings.System.putInt(activity.getContentResolver(),
Settings.System.SCREEN_BRIGHTNESS_MODE,
Settings.System.SCREEN_BRIGHTNESS_MODE_MANUAL);
}
// 开启亮度自动调节
public static void startAutoBrightness(Activity activity) {
Settings.System.putInt(activity.getContentResolver(),
Settings.System.SCREEN_BRIGHTNESS_MODE,
Settings.System.SCREEN_BRIGHTNESS_MODE_AUTOMATIC);
}
}
这是一个单独可工作的类,主要用于调节屏幕亮度,有部分注释了,解释几个概念,不标准,供参考:
ContentResolver类,为访问其它应用程序的对外共享数据提供方法,如上面获取、设置亮度时使用的System.getInt(),System.setInt()。
Activity类,android程序的主要类,一个界面必有此类提供后台支持,需要继承此类。
Settings类,android程序系统相关的设置类,各种设置都可在此找。
LayoutParams类,android界面相关的参数,如高度、宽度、亮度等。
Toast类,一个可自动消失的提示框,轻型控件。
转载请注明原址:http://www.cnblogs.com/lekko/archive/2013/03/20/2971825.html
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