发布于 2016-02-25 02:05:01 | 123 次阅读 | 评论: 0 | 来源: 网友投递
Android移动端操作系统
Android是一种基于Linux的自由及开放源代码的操作系统，主要使用于移动设备，如智能手机和平板电脑，由Google公司和开放手机联盟领导及开发。尚未有统一中文名称，中国大陆地区较多人使用“安卓”或“安致”。
本文实例讲述了Android编程获取并设置Activity亮度的方法。分享给大家供大家参考，具体如下：
此API只适合2.1以上版本：
/**
* 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;
}
/**
* 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;
}
/**
* 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);
}
/**
* 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,
Settings.System.SCREEN_BRIGHTNESS_MODE_MANUAL);
}
/**
* 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);
}
/**
* 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.notifyChange(uri, null);
}
使用SeekBar进行亮度控制：
sSeekBar = (SeekBar) findViewById(R.id.seek_bar);
sSeekBar.setOnSeekBarChangeListener(new OnSeekBarChangeListener() {
@Override
public void onStopTrackingTouch(SeekBar seekBar) {
// TODO Auto-generated method stub
}
@Override
public void onStartTrackingTouch(SeekBar seekBar) {
}
@Override
public void onProgressChanged(SeekBar seekBar, int progress,
boolean fromUser) {
if (progress < 10) {
} else {
setBrightness(Test2Activity.this, progress);
}
}
});
//获取当前亮度的位置
int a =getScreenBrightness(this);
sSeekBar.setProgress(a);
<SeekBar
android:id="@+id/seek_bar"
android:layout_width="200dp"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:max="255"
android:maxHeight="8dp"
android:minHeight="8dp"
android:paddingBottom="5dp"
android:paddingLeft="13dp"
android:paddingRight="13dp"
android:progress="0"
/>
希望本文所述对大家Android程序设计有所帮助。