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);

  注:1、b是一个浮点数 从0~1 ,表示亮度


         2、当我们遇到把Activity做为子Activity潜入到TabActivity 或者 ViewGroup 类容器时,通常上面的方法设置无法取得成功。


              在子Activity中,屏幕亮度不发生改变。因为调节亮度作用域发生了改变,之前是在Activity里面对亮度修改。

              而现在是作为子activity对TabActivity或ViewGroup 容器进行修改。

              因此不能成功,需要通过getParent()方法获取器Parent,然后设置。

          3、


(2)恢复

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。

(4)封装进度条控制




1、封装类:


package com.cindigo.MyView; 

 

  import android.content.Context; 
 
 import android.content.SharedPreferences; 
 
 import android.graphics.Color; 
 
 import android.preference.DialogPreference; 
 
 import android.preference.PreferenceManager; 
 
 import android.util.AttributeSet; 
 
 import android.util.Log; 
 
 import android.view.Gravity; 
 
 import android.view.View; 
 
 import android.widget.LinearLayout; 
 
 import android.widget.SeekBar; 
 
 import android.widget.TextView; 
 

  /** 
 
 * 
 
 * @Cindigo HUST 
 
 * 
 
 * @author jairkong 
 
 * 
 
 * 
  @SINCE 2012-11 
 
 * 
 
 * @模块及功能 自定义SeekBarPreference 
 
 * 
 
 **/ 
 

  /* 
 
 * 自定义SeekBarPreference 
 
 */ 
 
 public class SeekBarPreference extends DialogPreference implements SeekBar.OnSeekBarChangeListener 
 
 { 
 
 private static final String androidns="http://schemas.android.com/apk/res/android"; 
 

  public SeekBar mSeekBar; 
 
 private TextView mSplashText,mValueText; 
 
 private Context mContext; 
 

  private String mDialogMessage, mSuffix; 
 
 private int mDefault, mMax, mValue = 0,oldValue=0,preValue=0; 
 
 public SeekBarPreference(Context context, AttributeSet attrs) { 
 
 super(context,attrs); 
 
 mContext = context; 
 
 mDialogMessage = attrs.getAttributeValue(androidns,"dialogMessage"); 
 
 mSuffix = attrs.getAttributeValue(androidns,"text"); 
 
 mDefault = attrs.getAttributeIntValue(androidns,"defaultValue", 0); 
 
 mMax = attrs.getAttributeIntValue(androidns,"max", 100); 
 
 Log.e("SeekBarPreference", "SeekBarPreference1---"+"defaultValue:"+mDefault+"mDefault:"+mMax); 
 
 } 
 
 public SeekBarPreference(Context context, AttributeSet attrs,int defStyle) { 
 
 super(context, attrs, defStyle); 
 
 Log.e("SeekBarPreference", "SeekBarPreference2"); 
 
 } 
 
 /** 
 
 * 函数功能:创建dialog组建 
 
 * 
 
 * @param null 
 
 * 
 
 * @return layout 
 
 * 
 
 */ 
 
 @Override 
 
 protected View onCreateDialogView() { 
 
 LinearLayout.LayoutParams params; 
 
 LinearLayout layout = new LinearLayout(mContext); 
 
 layout.setOrientation(LinearLayout.VERTICAL); 
 
 layout.setPadding(6,6,6,6); 
 

  mSplashText = new TextView(mContext); 
 
 mSplashText.setTextColor(Color.WHITE); 
 
 mSplashText.setTextSize(20); 
 
 if (mDialogMessage != null) 
 
 mSplashText.setText(mDialogMessage); 
 
 layout.addView(mSplashText); 
 

  mValueText = new TextView(mContext); 
 
 mValueText.setGravity(Gravity.CENTER_HORIZONTAL); 
 
 mValueText.setTextSize(25); 
 
 mValueText.setTextColor(Color.WHITE); 
 
 params = new LinearLayout.LayoutParams( 
 
 LinearLayout.LayoutParams.FILL_PARENT, 
 
 LinearLayout.LayoutParams.WRAP_CONTENT); 
 
 mValue = shouldPersist() ? getPersistedInt(mDefault) : 0; 
 
 if (mValueText != null){ 
 
 String volum=String.valueOf(100*mValue/getMax())+"%"; 
 
 mValueText.setText(mSuffix == null ? volum : mSuffix.concat(volum)); 
 
 } 
 
 layout.addView(mValueText, params); 
 

 mSeekBar = new SeekBar(mContext); 
 
 //设置progressbar属性 
 
 setMax(mMax); 
 
 setProgress(mValue); 
 
 mSeekBar.setOnSeekBarChangeListener(this); 
 
 layout.addView(mSeekBar, new LinearLayout.LayoutParams(LinearLayout.LayoutParams.FILL_PARENT, LinearLayout.LayoutParams.WRAP_CONTENT)); 
 
 Log.e("SeekBarPreference", "onCreateDialogView---getProgress():"+getProgress()+"---Max:"+mMax); 
 
 getOldValue();//得到并保存初始值 
 
 Log.e("SeekBarPreference", "onCreateDialogView---oldValue:"+oldValue); 
 
 return layout; 
 
 } 
 
 /** 
 
 * 函数功能:重写绑定视图函数 
 
 * 
 
 * @param 
 
 * 
 
 * @return null 
 
 * 
 
 */ 
 
 @Override 
 
 protected void onBindDialogView(View v) { 
 
 super.onBindDialogView(v); 
 
 //设置progressbar属性 
 
 setMax(mMax); 
 
 setProgress(mValue); 
 
 Log.e("SeekBarPreference", "onBindDialogView---mValue:"+mValue); 
 
 } 
 
 /** 
 
 * 函数功能:重写sharepreference初始化函数 
 
 * 
 
 * @param 
 
 * 
 
 * @return null 
 
 * 
 
 */ 
 
 @Override 
 
 protected void onSetInitialValue(boolean restore, Object defaultValue) 
 
 { 
 
 super.onSetInitialValue(restore, defaultValue); 
 
 if (restore) { 
 
 mValue = shouldPersist() ? getPersistedInt(mDefault) : 0; 
 
 Log.e("SeekBarPreference", "onSetInitialValue--true--mValue:"+mValue+"mDefault:"+mDefault); 
 
 }else{ 
 
 mValue = (Integer)defaultValue; 
 
 Log.e("SeekBarPreference", "onSetInitialValue--false--mValue:"+mValue); 
 
 } 
 
 } 
 
 /** 
 
 * 函数功能:重写seekbar中progress值改变函数 
 
 * 
 
 * @param 
 
 * 
 
 * @return null 
 
 * 
 
 */ 
 
 public void onProgressChanged(SeekBar seek, int value, boolean fromTouch) 
 
 { 
 
 String volum=String.valueOf(100*value/getMax())+"%"; 
 
 mValueText.setText(mSuffix == null ? volum : mSuffix.concat(volum)); 
 
 if (shouldPersist()){ 
 
 persistInt(value); 
 
 Log.d("SeekBarPreference", "onProgressChanged---onProgressChanged:"+persistInt(value)); 
 
 } 
 
 callChangeListener(new Integer(value)); 
 
 this.mValue=value; 
 
 Log.d("SeekBarPreference", "onProgressChanged---onProgressChanged:"+value); 
 
 } 
 
 /** 
 
 * 函数功能:重写开始滑动seekbar 
 
 * 
 
 * @param null 
 
 * 
 
 * @return null 
 
 * 
 
 */ 
 
 @Override 
 
 public void onStartTrackingTouch(SeekBar seekBar) { 
 
 // TODO Auto-generated method stub 
 
 Log.e("SeekBarPreference", "onStartTrackingTouch---oldValue:"+oldValue); 
 
 } 
 
 /** 
 
 * 函数功能:重写停止滑动seekbar 
 
 * 
 
 * @param null 
 
 * 
 
 * @return null 
 
 * 
 
 */ 
 
 @Override 
 
 public void onStopTrackingTouch(SeekBar seekBar) { 
 
 // TODO Auto-generated method stub 
 
 updatePreference(mValue); 
 
 notifyChanged(); 
 
 Log.e("SeekBarPreference", "onStopTrackingTouch+preValue:"+getPreferenceValue()+"mvalue:"+mValue); 
 
 } 
 
 /** 
 
 * 函数功能:dialog关闭 
 
 * 
 
 * @param 
 
 * 
 
 * @return null 
 
 * 
 
 */ 
 
 @Override 
 
 protected void onDialogClosed(boolean positiveResult) { 
 
 // TODO Auto-generated method stub 
 
 if (positiveResult) { 
 
 updatePreference(mValue); 
 
 notifyChanged(); 
 
 Log.e("SeekBarPreference", "onDialogClosed--positive button---mValue:"+mValue); 
 
 } else { 
 
 updatePreference(oldValue); 
 
 notifyChanged(); 
 
 Log.e("SeekBarPreference", "onDialogClosed--negative button---oldValue:"+oldValue); 
 
 } 
 
 } 
 
 /** 
 
 * 函数功能:设置seekbar中的max 
 
 * 
 
 * @param 
 
 * 
 
 * @return null 
 
 * 
 
 */ 
 
 public void setMax(int max) { 
 
 mMax = max; 
 
 if (mSeekBar != null) 
 
 mSeekBar.setMax(mMax); 
 
 } 
 
 /** 
 
 * 函数功能:得到seekbar中的max 
 
 * 
 
 * @param null 
 
 * 
 
 * @return mMax 
 
 * 
 
 */ 
 
 public int getMax() { 
 
 return mMax; 
 
 } 
 
 /** 
 
 * 函数功能:设置seekbar中的progress 
 
 * 
 
 * @param 
 
 * 
 
 * @return null 
 
 * 
 
 */ 
 
 public void setProgress(int progress) { 
 
 mValue = progress; 
 
 if (mSeekBar != null) 
 
 mSeekBar.setProgress(progress); 
 
 } 
 
 /** 
 
 * 函数功能:得到seekbar中的progress 
 
 * 
 
 * @param null 
 
 * 
 
 * @return mValue 
 
 * 
 
 */ 
 
 public int getProgress() { 
 
 return mValue; 
 
 } 
 
 /** 
 
 * 函数功能:更新sharepreference中的值 
 
 * 
 
 * @param 
 
 * 
 
 * @return null 
 
 * 
 
 */ 
 
 private void updatePreference(int newValue) { 
 
 SharedPreferences.Editor editor = getEditor(); 
 
 editor.putInt(getKey(), newValue); 
 
 editor.commit(); //更新 SharedPreferences 配置文件中的值 
 
 } 
 
 /** 
 
 * 函数功能:得到sharepreference中的值 
 
 * 
 
 * @param null 
 
 * 
 
 * @return null 
 
 * 
 
 */ 
 
 public int getPreferenceValue() { 
 
 if (shouldPersist()){ 
 
 this.preValue= getPersistedInt(mDefault); 
 
 } 
 
 Log.e("SeekBarPreference", "getPreferenceValue---preValue:"+preValue); 
 
 return this.preValue; 
 
 } 
 
 /** 
 
 * 函数功能:得到打开dialog之前sharepreference中的值 
 
 * 
 
 * @param null 
 
 * 
 
 * @return null 
 
 * 
 
 */ 
 
 public void getOldValue() { 
 
 this.oldValue= shouldPersist() ? getPersistedInt(mDefault) : 0; 
 
 Log.e("SeekBarPreference", "getOldValue---oldValue:"+oldValue); 
 
 } 
 

 }

2、使用:

A、在preference中直接配置:

<?xml version="1.0" encoding="utf-8"?> 
 
 < PreferenceScreen xmlns:android="http://schemas.android.com/apk/res/android" > 
 
 < PreferenceCategory android:layout="@layout/preference_category" > 
 
 < com.cindigo.MyView.SeekBarPreference 
 
 android:dialogTitle="@string/preference_volume_dialogtitle" 
 
 android:key="preference_volume" 
 
 android:title="@string/preference_volume_title" 
 
 android:summary="@string/preference_volume_summary" 
 
 android:defaultValue="50" 
 
 android:max="100" 
 
 android:text="音量:" 
 
 android:dialogMessage="请在此调节游戏音量大小:" 
 
 android:layout="@layout/preference_layout_seekbar" 
 
 android:widgetLayout="@layout/preference_arrow"/> 
 

  </PreferenceScreen>

B、代码中监听事件:

public class SettingActivity extends PreferenceActivity implements OnSharedPreferenceChangeListener { 
 
    private  SeekBarPreference sp; 
 
     @Override 
 
     protected void onCreate(Bundle savedInstanceState) { 
 
         // TODO Auto-generated method stub 
 
         super.onCreate(savedInstanceState); 
 
         setContentView(R.layout.buttonbar); 
 
         addPreferencesFromResource(R.xml.custom_setting); 
 
         sp= PreferenceManager.getDefaultSharedPreferences(this); 
 
        sp.registerOnSharedPreferenceChangeListener(this);//监听数据变化,调节屏幕亮度 
 
            } 
 
     @Override 
 
     public void onSharedPreferenceChanged(SharedPreferences sp, String key) { 
 
         // TODO Auto-generated method stub 
 
        
 
            int brightness=sp.getInt("brightness", 125); 
 
            LayoutParams lp=   getWindow().getAttributes(); 
 
           lp.screenBrightness=brightness/255.0f; 
 
           getWindow().setAttributes(lp); 
 
         
 
     } 
 
 }





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);

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; 
 
     }

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; 
 
     }

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); 
 

     }

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); 
 
     }

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); 
 
     }

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); 
 
     }

这回该差不多了。







(3)封装:


import android.app.Activity;
 import android.content.ContentResolver;
 import android.content.Context;
 import android.provider.Settings;
 import android.provider.Settings.SettingNotFoundException;
 import android.view.Window;
 import android.view.WindowManager;

 public class ScreenBrightnessTool
 {
     /**
      * Activty自动调节亮度模式
      */
     public static final int ACTIVITY_BRIGHTNESS_AUTOMATIC = -1;
     /**
      * 自动调节模式
      */
     public static final int SCREEN_BRIGHTNESS_MODE_AUTOMATIC = Settings.System.SCREEN_BRIGHTNESS_MODE_AUTOMATIC;
     /**
      * 手动调节模式
      */
     public static final int SCREEN_BRIGHTNESS_MODE_MANUAL = Settings.System.SCREEN_BRIGHTNESS_MODE_MANUAL;
     /**
      * 默认亮度
      */
     public static final int SCREEN_BRIGHTNESS_DEFAULT = 75;
     /**
      * 最大亮度
      */
     public static final int MAX_BRIGHTNESS = 100;
     /**
      * 最小亮度
      */
     public static final int MIN_BRIGHTNESS = 0;

     private static final int mMaxBrighrness = 255;
     private static final int mMinBrighrness = 120;

     // 当前系统调节模式
     private boolean sysAutomaticMode;
     // 当前系统亮度值
     private int sysBrightness;

     private Context context;

     private ScreenBrightnessTool(Context context, int sysBrightness,
             boolean sysAutomaticMode)
     {
         this.context = context;
         this.sysBrightness = sysBrightness;
         this.sysAutomaticMode = sysAutomaticMode;
     }

     /**
      * 创建屏幕亮度工具
      * 
      * @param context
      * @return
      */
     public static ScreenBrightnessTool Builder(Context context)
     {
         int brightness;
         boolean automaticMode;
         try
         {
             // 获取当前系统亮度值
             brightness = Settings.System.getInt(context.getContentResolver(),
                     Settings.System.SCREEN_BRIGHTNESS);
             // 获取当前系统调节模式
             automaticMode = Settings.System.getInt(
                     context.getContentResolver(),
                     Settings.System.SCREEN_BRIGHTNESS_MODE) == SCREEN_BRIGHTNESS_MODE_AUTOMATIC;
         }
         catch (SettingNotFoundException e)
         {
             return null;
         }

         return new ScreenBrightnessTool(context, brightness, automaticMode);
     }

     /**
      * 返回当前系统亮度调节模式
      * 
      * @return
      */
     public boolean getSystemAutomaticMode()
     {
         return sysAutomaticMode;
     }

     /**
      * 返回当前系统亮度值
      * 
      * @return
      */
     public int getSystemBrightness()
     {
         return sysBrightness;
     }

     /**
      * 设置调节模式
      * 
      * @param mode
      *            调节模式
      */
     public void setMode(int mode)
     {
         if (mode != SCREEN_BRIGHTNESS_MODE_AUTOMATIC
                 && mode != SCREEN_BRIGHTNESS_MODE_MANUAL)
             return;

         sysAutomaticMode = mode == SCREEN_BRIGHTNESS_MODE_AUTOMATIC;
         Settings.System.putInt(context.getContentResolver(),
                 Settings.System.SCREEN_BRIGHTNESS_MODE, mode);
     }

     /**
      * 设置屏幕亮度
      * 
      * @param brightness
      *            亮度值,值为0至100
      */
     public void setBrightness(int brightness)
     {
         int mid = mMaxBrighrness - mMinBrighrness;
         int bri = (int) (mMinBrighrness + mid * ((float) brightness)
                 / MAX_BRIGHTNESS);

         ContentResolver resolver = context.getContentResolver();
         Settings.System
                 .putInt(resolver, Settings.System.SCREEN_BRIGHTNESS, bri);
     }

     /**
      * 亮度预览
      * 
      * @param activity
      *            预览activity
      * @param brightness
      *            亮度值(0.47~1)
      */
     public static void brightnessPreview(Activity activity, float brightness)
     {
         Window window = activity.getWindow();
         WindowManager.LayoutParams lp = window.getAttributes();
         lp.screenBrightness = brightness;
         window.setAttributes(lp);
     }

     /**
      * 亮度预览
      * 
      * @param activity
      *            预览activity
      * @param percent
      *            百分比(0.0~1.00)
      */
     public static void brightnessPreviewFromPercent(Activity activity,
             float percent)
     {
         float brightness = percent + (1.0f - percent)
                 * (((float) mMinBrighrness) / mMaxBrighrness);
         brightnessPreview(activity, brightness);
     }

 }



三:更多参考:

Android 调节屏幕亮度问题 - kerlubasola - ITeye技术网站Source URL:http://kerlubasola.iteye.com/blog/1581385

Android-Android屏幕亮度设置 - 德问:编程社交问答Source URL:http://www.dewen.org/q/2519