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 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。 (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**/@Overrideprotected 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**/@Overrideprotected 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**/@Overrideprotected 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**/@Overridepublic void onStartTrackingTouch(SeekBar seekBar) {// TODO Auto-generated method stubLog.e("SeekBarPreference", "onStartTrackingTouch---oldValue:"+oldValue);}/*** 函数功能:重写停止滑动seekbar** @param null** @return null**/@Overridepublic void onStopTrackingTouch(SeekBar seekBar) {// TODO Auto-generated method stubupdatePreference(mValue);notifyChanged();Log.e("SeekBarPreference", "onStopTrackingTouch+preValue:"+getPreferenceValue()+"mvalue:"+mValue);}/*** 函数功能:dialog关闭** @param** @return null**/@Overrideprotected void onDialogClosed(boolean positiveResult) {// TODO Auto-generated method stubif (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.SeekBarPreferenceandroid: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 关于调节屏幕亮度的问题-CSDN问答Source URL:http://ask.csdn.net/questions/170
Android 调节屏幕亮度问题 - kerlubasola - ITeye技术网站Source URL:http://kerlubasola.iteye.com/blog/1581385
Android调节屏幕亮度 - android 开发专栏 - 博客频道 - CSDN.NETSource URL:http://blog.csdn.net/androidchuxueze/article/details/7452438
Android-Android屏幕亮度设置 - 德问:编程社交问答Source URL:http://www.dewen.org/q/2519

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