贴一段调整安卓手机屏幕亮度的代码 ，可以参考使用，见下：
public void setBrightness(int level) {
ContentResolver cr = getContentResolver();
Settings.System.putInt(cr, "screen_brightness", level);
try {
defaultLevel = Settings.System.getInt(cr, "screen_brightness");
} catch (SettingNotFoundException e) {
e.printStackTrace();
}
Window window = getWindow();
LayoutParams attributes = window.getAttributes();
float flevel = level;
attributes.screenBrightness = flevel / 255;
getWindow().setAttributes(attributes);
}
此外，UiModeManager这个类提供了控制系统UI模式的服务，可以参考使用：
{
UiModeManager uim = (UiModeManager) getSystemService(Context.UI_MODE_SERVICE);
int i = uim.getCurrentModeType();
if (i != Configuration.UI_MODE_TYPE_CAR) {
uim.enableCarMode(0);
}
uim.setNightMode(UiModeManager.MODE_NIGHT_YES);
}
关于UiModeManager的代码见下：
package android.app;
import android.content.Context;
import android.content.res.Configuration;
import android.os.RemoteException;
import android.os.ServiceManager;
import android.util.Log;
/**
* This class provides access to the system uimode services. These services
* allow applications to control UI modes of the device.
* It provides functionality to disable the car mode and it gives access to the
* night mode settings.
*
*
These facilities are built on top of the underlying
* {@link android.content.Intent#ACTION_DOCK_EVENT} broadcasts that are sent when the user
* physical places the device into and out of a dock. When that happens,
* the UiModeManager switches the system {@link android.content.res.Configuration}
* to the appropriate UI mode, sends broadcasts about the mode switch, and
* starts the corresponding mode activity if appropriate. See the
* broadcasts {@link #ACTION_ENTER_CAR_MODE} and
* {@link #ACTION_ENTER_DESK_MODE} for more information.
*
*
In addition, the user may manually switch the system to car mode without
* physically being in a dock. While in car mode -- whether by manual action
* from the user or being physically placed in a dock -- a notification is
* displayed allowing the user to exit dock mode. Thus the dock mode
* represented here may be different than the current state of the underlying
* dock event broadcast.
*
*
You do not instantiate this class directly; instead, retrieve it through
* {@link android.content.Context#getSystemService
* Context.getSystemService(Context.UI_MODE_SERVICE)}.
*/
public class UiModeManager {
private static final String TAG = "UiModeManager";
/**
* Broadcast sent when the device's UI has switched to car mode, either
* by being placed in a car dock or explicit action of the user. After
* sending the broadcast, the system will start the intent
* {@link android.content.Intent#ACTION_MAIN} with category
* {@link android.content.Intent#CATEGORY_CAR_DOCK}
* to display the car UI, which typically what an application would
* implement to provide their own interface. However, applications can
* also monitor this Intent in order to be informed of mode changes or
* prevent the normal car UI from being displayed by setting the result
* of the broadcast to {@link Activity#RESULT_CANCELED}.
*/
public static String ACTION_ENTER_CAR_MODE = "android.app.action.ENTER_CAR_MODE";
/**
* Broadcast sent when the device's UI has switch away from car mode back
* to normal mode. Typically used by a car mode app, to dismiss itself
* when the user exits car mode.
*/
public static String ACTION_EXIT_CAR_MODE = "android.app.action.EXIT_CAR_MODE";
/**
* Broadcast sent when the device's UI has switched to desk mode,
* by being placed in a desk dock. After
* sending the broadcast, the system will start the intent
* {@link android.content.Intent#ACTION_MAIN} with category
* {@link android.content.Intent#CATEGORY_DESK_DOCK}
* to display the desk UI, which typically what an application would
* implement to provide their own interface. However, applications can
* also monitor this Intent in order to be informed of mode changes or
* prevent the normal desk UI from being displayed by setting the result
* of the broadcast to {@link Activity#RESULT_CANCELED}.
*/
public static String ACTION_ENTER_DESK_MODE = "android.app.action.ENTER_DESK_MODE";
/**
* Broadcast sent when the device's UI has switched away from desk mode back
* to normal mode. Typically used by a desk mode app, to dismiss itself
* when the user exits desk mode.
*/
public static String ACTION_EXIT_DESK_MODE = "android.app.action.EXIT_DESK_MODE";
/** Constant for {@link #setNightMode(int)} and {@link #getNightMode()}:
* automatically switch night mode on and off based on the time.
*/
public static final int MODE_NIGHT_AUTO = Configuration.UI_MODE_NIGHT_UNDEFINED >> 4;
/** Constant for {@link #setNightMode(int)} and {@link #getNightMode()}:
* never run in night mode.
*/
public static final int MODE_NIGHT_NO = Configuration.UI_MODE_NIGHT_NO >> 4;
/** Constant for {@link #setNightMode(int)} and {@link #getNightMode()}:
* always run in night mode.
*/
public static final int MODE_NIGHT_YES = Configuration.UI_MODE_NIGHT_YES >> 4;
private IUiModeManager mService;
/*package*/ UiModeManager() {
mService = IUiModeManager.Stub.asInterface(
ServiceManager.getService(Context.UI_MODE_SERVICE));
}
/**
* Flag for use with {@link #enableCarMode(int)}: go to the car
* home activity as part of the enable. Enabling this way ensures
* a clean transition between the current activity (in non-car-mode) and
* the car home activity that will serve as home while in car mode. This
* will switch to the car home activity even if we are already in car mode.
*/
public static final int ENABLE_CAR_MODE_GO_CAR_HOME = 0x0001;
/**
* Force device into car mode, like it had been placed in the car dock.
* This will cause the device to switch to the car home UI as part of
* the mode switch.
* @param flags Must be 0.
*/
public void enableCarMode(int flags) {
if (mService != null) {
try {
mService.enableCarMode(flags);
} catch (RemoteException e) {
Log.e(TAG, "disableCarMode: RemoteException", e);
}
}
}
/**
* Flag for use with {@link #disableCarMode(int)}: go to the normal
* home activity as part of the disable. Disabling this way ensures
* a clean transition between the current activity (in car mode) and
* the original home activity (which was typically last running without
* being in car mode).
*/
public static final int DISABLE_CAR_MODE_GO_HOME = 0x0001;
/**
* Turn off special mode if currently in car mode.
* @param flags May be 0 or {@link #DISABLE_CAR_MODE_GO_HOME}.
*/
public void disableCarMode(int flags) {
if (mService != null) {
try {
mService.disableCarMode(flags);
} catch (RemoteException e) {
Log.e(TAG, "disableCarMode: RemoteException", e);
}
}
}
/**
* Return the current running mode type. May be one of
* {@link Configuration#UI_MODE_TYPE_NORMAL Configuration.UI_MODE_TYPE_NORMAL},
* {@link Configuration#UI_MODE_TYPE_DESK Configuration.UI_MODE_TYPE_DESK}, or
* {@link Configuration#UI_MODE_TYPE_CAR Configuration.UI_MODE_TYPE_CAR},
*/
public int getCurrentModeType() {
if (mService != null) {
try {
return mService.getCurrentModeType();
} catch (RemoteException e) {
Log.e(TAG, "getCurrentModeType: RemoteException", e);
}
}
return Configuration.UI_MODE_TYPE_NORMAL;
}
/**
* Sets the night mode. Changes to the night mode are only effective when
* the car or desk mode is enabled on a device.
*
*
The mode can be one of:
*
*
{@link #MODE_NIGHT_NO}- sets the device into notnight
* mode.
*
{@link #MODE_NIGHT_YES}- sets the device into night mode.
*
*
{@link #MODE_NIGHT_AUTO}- automatic night/notnight switching
* depending on the location and certain other sensors.
*
*/
public void setNightMode(int mode) {
if (mService != null) {
try {
mService.setNightMode(mode);
} catch (RemoteException e) {
Log.e(TAG, "setNightMode: RemoteException", e);
}
}
}
/**
* Returns the currently configured night mode.
*
* @return {@link #MODE_NIGHT_NO}, {@link #MODE_NIGHT_YES}, or
* {@link #MODE_NIGHT_AUTO}. When an error occurred -1 is returned.
*/
public int getNightMode() {
if (mService != null) {
try {
return mService.getNightMode();
} catch (RemoteException e) {
Log.e(TAG, "getNightMode: RemoteException", e);
}
}
return -1;
}
}
