Android 调节屏幕亮度(当前应用和系统亮度)

1、只改变当前程序屏幕亮度

当前屏幕亮度的取值范围：attrs.screenBrightness 0.0（暗）～1.0（亮）

需要屏幕恢复到系统亮度，可将 attrs.screenBrightness 设为 -1

(WindowManager.LayoutParams.BRIGHTNESS_OVERRIDE_NONE

调用方法

<pre name="code" class="html">public static void setBrightness(int brightValue) {WindowManager.LayoutParams lp = getWindow().getAttributes();lp.screenBrightness = (brightValue <= 0 ? -1.0f : brightValue / 255f);getWindow().setAttributes(lp);}

2、调用系统亮度

所需权限

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

可以分为：手动调节和自动调节两种方式( Android 2. 1 以后提供了自动调节的功能 )

(1)判读是系统是哪种模式：手动还是自动模式

public static boolean isAutoBrightness(Activity activity) {boolean autoBrightness = false;ContentResolver contentResolver = activity.getContentResolver();try {autoBrightness = Settings.System.getInt(contentResolver,Settings.System.SCREEN_BRIGHTNESS_MODE) == Settings.System.SCREEN_BRIGHTNESS_MODE_AUTOMATIC;} catch (SettingNotFoundException e) {e.printStackTrace();}return autoBrightness;}

(2)获取当前系统的亮度值:

public static int getBrightness(Activity activity) {int brightValue = 0; ContentResolver contentResolver = activity.getContentResolver();try {brightValue = Settings.System.getInt(contentResolver, Settings.System.SCREEN_BRIGHTNESS);} catch (SettingNotFoundException e) {e.printStackTrace();}  return brightValue;}

(3)设置当前系统的亮度值：

public static void setBrightness(Activity activity, int brightValue) {WindowManager.LayoutParams lp = activity.getWindow().getAttributes();lp.screenBrightness = (brightValue <= 0 ? -1.0f : brightValue / 255f);activity.getWindow().setAttributes(lp);}

(4)开启自动调节模式：

public static void startAutoBrightness(Activity activity) {Settings.System.putInt(activity.getContentResolver(),Settings.System.SCREEN_BRIGHTNESS_MODE,Settings.System.SCREEN_BRIGHTNESS_MODE_AUTOMATIC);Uri uri = android.provider.Settings.System.getUriFor("screen_brightness");  activity.getContentResolver().notifyChange(uri, null);  }

(5)关闭自动调节模式：

public static void stopAutoBrightness(Activity activity) {Settings.System.putInt(activity.getContentResolver(),Settings.System.SCREEN_BRIGHTNESS_MODE,Settings.System.SCREEN_BRIGHTNESS_MODE_MANUAL);Uri uri = android.provider.Settings.System.getUriFor("screen_brightness");  activity.getContentResolver().notifyChange(uri, null);  }

3、封装上述方法

 package com.why.example;import android.app.Activity;
import android.content.ContentResolver;
import android.net.Uri;
import android.provider.Settings;
import android.provider.Settings.SettingNotFoundException;
import android.view.WindowManager;/*** 封装系统亮度* @author why*/
public class SystemBrightManager {// 判断是否开启了自动亮度调节public static boolean isAutoBrightness(Activity activity) {boolean autoBrightness = false;ContentResolver contentResolver = activity.getContentResolver();try {autoBrightness = Settings.System.getInt(contentResolver,Settings.System.SCREEN_BRIGHTNESS_MODE) == Settings.System.SCREEN_BRIGHTNESS_MODE_AUTOMATIC;} catch (SettingNotFoundException e) {e.printStackTrace();}return autoBrightness;}// 获取当前系统亮度值public static int getBrightness(Activity activity) {int brightValue = 0; ContentResolver contentResolver = activity.getContentResolver();try {brightValue = Settings.System.getInt(contentResolver, Settings.System.SCREEN_BRIGHTNESS);} catch (SettingNotFoundException e) {e.printStackTrace();}  return brightValue;}// 改变屏幕亮度public static void setBrightness(Activity activity, int brightValue) {WindowManager.LayoutParams lp = activity.getWindow().getAttributes();lp.screenBrightness = (brightValue <= 0 ? -1.0f : brightValue / 255f);activity.getWindow().setAttributes(lp);}// 开启亮度自动亮度模式public static void startAutoBrightness(Activity activity) {Settings.System.putInt(activity.getContentResolver(),Settings.System.SCREEN_BRIGHTNESS_MODE,Settings.System.SCREEN_BRIGHTNESS_MODE_AUTOMATIC);Uri uri = android.provider.Settings.System.getUriFor("screen_brightness");  activity.getContentResolver().notifyChange(uri, null);  }// 停止自动亮度模式public static void stopAutoBrightness(Activity activity) {Settings.System.putInt(activity.getContentResolver(),Settings.System.SCREEN_BRIGHTNESS_MODE,Settings.System.SCREEN_BRIGHTNESS_MODE_MANUAL);Uri uri = android.provider.Settings.System.getUriFor("screen_brightness");  activity.getContentResolver().notifyChange(uri, null);  }/** * 设置当前屏幕亮度的模式  * SCREEN_BRIGHTNESS_MODE_AUTOMATIC=1 为自动调节屏幕亮度 * SCREEN_BRIGHTNESS_MODE_MANUAL=0 为手动调节屏幕亮度 */  public static void setBrightnessMode(Activity activity, int brightMode) {  Settings.System.putInt(activity.getContentResolver(), Settings.System.SCREEN_BRIGHTNESS_MODE, brightMode);  }
}

4、MainActivity 主函数

package com.why.example;import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.view.WindowManager;
import android.widget.Button;
import android.widget.SeekBar;
import android.widget.SeekBar.OnSeekBarChangeListener;import com.why.example.R;/*** 1.滑动SeekBar 改变当前屏幕的亮度值 * 2.点击button  调用系统的亮度(手动和自动两种模式)*                根据系统判断是手动还是自动* @author why*/
public class MainActivity extends Activity {private Button button;private SeekBar lightSeek;private boolean flag = false;private int defalutValue = 75;@Overridepublic void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.main);button = (Button) findViewById(R.id.button);lightSeek = (SeekBar) findViewById(R.id.light_seekBar);lightSeek.setOnSeekBarChangeListener(seekBarChange);}public void System (View v) {if (flag) {flag = false;button.setTextColor(getResources().getColor(R.color.black));button.setText(getResources().getString(R.string.star));setScreenLight(defalutValue);} else {flag = true; button.setTextColor(getResources().getColor(R.color.red));button.setText(getResources().getString(R.string.close));boolean isAutoBrightness = SystemBrightManager.isAutoBrightness(this);if (isAutoBrightness) {  // 自动调整亮度SystemBrightManager.setBrightness(this, -1);} else {int brightValue = SystemBrightManager.getBrightness(this);SystemBrightManager.setBrightness(this, brightValue);}}}private OnSeekBarChangeListener seekBarChange = new OnSeekBarChangeListener() {@Overridepublic void onStopTrackingTouch(SeekBar seekBar) {}@Overridepublic void onStartTrackingTouch(SeekBar seekBar) {}@Overridepublic void onProgressChanged(SeekBar seekBar, int progress, boolean fromUser) {setScreenLight(progress);}};public void setScreenLight(int progress) {if (progress < 1) {progress = 1;} else if (progress > 255) {progress = 255;}final WindowManager.LayoutParams attrs = getWindow().getAttributes();attrs.screenBrightness = progress / 255f;getWindow().setAttributes(attrs);defalutValue = progress;}}

5、main.xml 布局文件

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"android:layout_width="match_parent"android:layout_height="match_parent"android:background="@color/white" ><TextViewandroid:id="@+id/textView"android:layout_width="wrap_content"android:layout_height="wrap_content"android:layout_centerHorizontal="true"android:layout_centerVertical="true"android:text="@string/app_name"android:textColor="@color/black"android:textSize="16sp" /><LinearLayoutandroid:id="@+id/linearLayout"android:layout_width="wrap_content"android:layout_height="wrap_content"android:layout_below="@+id/textView"android:layout_marginTop="15dp"android:layout_centerHorizontal="true" ><TextViewandroid:layout_width="wrap_content"android:layout_height="wrap_content"android:padding="5dp"android:text="@string/change"android:textColor="@color/black"android:textSize="13sp" /><SeekBarandroid:id="@+id/light_seekBar"android:layout_width="180dp"android:layout_height="wrap_content"android:maxHeight="10.0dip"android:minHeight="4.0dip"android:paddingLeft="15dip"android:paddingRight="15dip"android:progress="75"android:max="255" /></LinearLayout><Buttonandroid:id="@+id/button"android:layout_width="wrap_content"android:layout_height="wrap_content"android:layout_below="@+id/linearLayout"android:layout_centerHorizontal="true"android:layout_marginTop="15dp"android:onClick="System"android:text="@string/star"android:background="@color/white"android:textColor="@color/black" /></RelativeLayout>

demo下载地址

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