android中屏幕亮度相关设置

测试Activity：

[java] view plain copy

packagecom.home.screenbrightness;
importandroid.app.Activity;
importandroid.os.Bundle;
importandroid.provider.Settings;
importandroid.widget.SeekBar;
importandroid.widget.SeekBar.OnSeekBarChangeListener;
publicclassTestScreenBrightnessActivityextendsActivity{
privateintbrightness;
privateSeekBarseekbar;
@Override
protectedvoidonCreate(BundlesavedInstanceState){
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
seekbar=(SeekBar)findViewById(R.id.main_sb);
initBrightness();
seekbar.setOnSeekBarChangeListener(newOnSeekBarChangeListener(){
@Override
publicvoidonStopTrackingTouch(SeekBarseekBar){
brightness=seekBar.getProgress();
seekBar.setProgress(brightness);
SetAndGetDataUtil.SetData(getApplicationContext(),"test",
"light",brightness+"");
}
@Override
publicvoidonStartTrackingTouch(SeekBarseekBar){
}
@Override
publicvoidonProgressChanged(SeekBarseekBar,intprogress,
booleanfromUser){
intcurProgress=seekBar.getProgress();//得到当前进度值
//当进度小于70时，设置成70，防止太黑看不见的情况。
if(curProgress<70){
curProgress=70;
}
//根据当前进度改变屏幕亮度
Settings.System.putInt(getContentResolver(),
Settings.System.SCREEN_BRIGHTNESS,curProgress);
curProgress=Settings.System.getInt(getContentResolver(),
Settings.System.SCREEN_BRIGHTNESS,-1);
BrightnessUtil.setBrightness(TestScreenBrightnessActivity.this,
curProgress);
//BrightnessUtil.saveBrightness(TestScreenBrightnessActivity.this,
//curProgress);
}
});
}
/**
*初始化屏幕亮度值
*/
privatevoidinitBrightness(){
//如果开启了自动亮度调节，则关闭之
if(BrightnessUtil.isAutoBrightness(this)){
BrightnessUtil.stopAutoBrightness(this);
}
//读取文件中设置的亮度值
Stringlight=SetAndGetDataUtil.GetData(this,"test","light");
if(!"".equals(light)){
brightness=Integer.valueOf(light);
}else{
brightness=BrightnessUtil.getScreenBrightness(this);
}
BrightnessUtil.setBrightness(this,brightness);
seekbar.setProgress(brightness);
}
}

存取数据工具类：SetAndGetDataUtil

[java] view plain copy

packagecom.home.screenbrightness;
importandroid.content.Context;
importandroid.content.SharedPreferences;
importandroid.content.SharedPreferences.Editor;
/**
*保存数据的工具类
*
*@authorAdministrator
*
*/
publicclassSetAndGetDataUtil{
privatestaticSharedPreferencessp;
@SuppressWarnings("static-access")
publicstaticvoidSetData(Contextcontext,Stringfilename,Stringkey,
Stringvalue){
sp=context.getSharedPreferences(filename,context.MODE_PRIVATE);
Editoreditor=sp.edit();
editor.putString(key,value);
editor.commit();
}
@SuppressWarnings("static-access")
publicstaticStringGetData(Contextcontext,Stringfilename,Stringkey){
Stringvalue="";
sp=context.getSharedPreferences(filename,context.MODE_PRIVATE);
value=sp.getString(key,"");
returnvalue;
}
}

屏幕亮度处理工具类：

[java] view plain copy

packagecom.home.screenbrightness;
importandroid.app.Activity;
importandroid.content.ContentResolver;
importandroid.net.Uri;
importandroid.provider.Settings;
importandroid.provider.Settings.SettingNotFoundException;
importandroid.view.WindowManager;
/**
*处理屏幕亮度的工具类
*
*@authorAdministrator
*
*/
publicclassBrightnessUtil{
/**
*判断是否开启了自动亮度调节
*
*@paramactivity
*@return
*/
publicstaticbooleanisAutoBrightness(Activityactivity){
booleanisAutoAdjustBright=false;
try{
isAutoAdjustBright=Settings.System.getInt(
activity.getContentResolver(),
Settings.System.SCREEN_BRIGHTNESS_MODE)==Settings.System.SCREEN_BRIGHTNESS_MODE_AUTOMATIC;
}catch(SettingNotFoundExceptione){
e.printStackTrace();
}
returnisAutoAdjustBright;
}
/**
*获取屏幕的亮度
*
*@paramactivity
*@return
*/
publicstaticintgetScreenBrightness(Activityactivity){
intbrightnessValue=0;
try{
brightnessValue=android.provider.Settings.System.getInt(
activity.getContentResolver(),
Settings.System.SCREEN_BRIGHTNESS);
}catch(Exceptione){
e.printStackTrace();
}
returnbrightnessValue;
}
/**
*设置屏幕亮度
*
*@paramactivity
*@parambrightness
*/
publicstaticvoidsetBrightness(Activityactivity,intbrightness){
WindowManager.LayoutParamslp=activity.getWindow().getAttributes();
lp.screenBrightness=Float.valueOf(brightness)*(1f/255f);
activity.getWindow().setAttributes(lp);
}
/**
*关闭亮度自动调节
*
*@paramactivity
*/
publicstaticvoidstopAutoBrightness(Activityactivity){
Settings.System.putInt(activity.getContentResolver(),
Settings.System.SCREEN_BRIGHTNESS_MODE,
Settings.System.SCREEN_BRIGHTNESS_MODE_MANUAL);
}
/**
*开启亮度自动调节
*
*@paramactivity
*/
publicstaticvoidstartAutoBrightness(Activityactivity){
Settings.System.putInt(activity.getContentResolver(),
Settings.System.SCREEN_BRIGHTNESS_MODE,
Settings.System.SCREEN_BRIGHTNESS_MODE_AUTOMATIC);
}
/**
*保存亮度设置状态
*
*@paramactivity
*@parambrightness
*/
publicstaticvoidsaveBrightness(Activityactivity,intbrightness){
Uriuri=android.provider.Settings.System
.getUriFor("screen_brightness");
ContentResolverresolver=activity.getContentResolver();
android.provider.Settings.System.putInt(resolver,"screen_brightness",
brightness);
resolver.notifyChange(uri,null);
}
}

布局文件：

[html] view plain copy

<LinearLayoutxmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:gravity="center"
android:orientation="vertical">
<SeekBar
android:id="@+id/main_sb"
style="@android:style/Widget.ProgressBar.Horizontal"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:max="255"/>
</LinearLayout>

记得加上权限：

[html] view plain copy

<uses-permissionandroid:name="android.permission.WRITE_SETTINGS"/>

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