android調節螢幕亮度

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Android的螢幕亮度好像在2.1+的時候提供了自動調節的功能， 所以，如果當開啟自動調節功能的時候， 我們進行調節好像是沒有一點作用的，只有進行判斷，看是否開啟了螢幕亮度的自動調節功能，如果開啟了需要進行關閉。

 

 

package com.vm.common;import android.app.Activity;import android.content.ContentResolver;import android.net.Uri;import android.provider.Settings;import android.provider.Settings.SettingNotFoundException;import android.util.Log;import android.view.WindowManager;public class BrightnessTools {    /** * 判斷是否開啟了自動亮度調節 */    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;    }    /**     * 擷取螢幕的亮度     * @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;    }    /**     * 設定亮度     * @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);        Log.d("lxy", "set  lp.screenBrightness == " + lp.screenBrightness);        activity.getWindow().setAttributes(lp);    }    // 那麼，能設定了，但是為什麼還是會出現，設定了，沒反映呢？    // 嘿嘿，那是因為，開啟了自動調節功能了，那如何關閉呢？這才是最重要的：    /**     * 停止自動亮度調節     * @param activity     */    public static void stopAutoBrightness(Activity activity) {        Settings.System.putInt(activity.getContentResolver(),        Settings.System.SCREEN_BRIGHTNESS_MODE,        Settings.System.SCREEN_BRIGHTNESS_MODE_MANUAL);    }    /**     * 開啟亮度自動調節      * @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，應該說操作亮度的差不多都有了，結束！    // 哎，本來認為是應該結束了，但是悲劇得是，既然像剛才那樣設定的話，只能在當前的activity中有作用，一段退出的時候，會發現毫無作用，悲劇，原來是忘記了儲存了。汗！    /**     * 儲存亮度設定狀態     * @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);    }}

 

測試

 

 //設定應用中的亮度 不儲存    public void Brightness(View view){        boolean autoBrightness = BrightnessTools.isAutoBrightness(getContentResolver());        if (autoBrightness) {            T.showLong(this, "關閉自動調節亮度");            BrightnessTools.stopAutoBrightness(this);        }        BrightnessTools.setBrightness(this, 255);        T.showLong(this, "亮度已經設定為了最大");    }    //擷取當前亮度 並設定最大的亮度儲存    public void saveBrightness(View view){        int screenBrightness = BrightnessTools.getScreenBrightness(this);        T.showLong(this, "當前螢幕亮度為："+screenBrightness);        BrightnessTools.saveBrightness(getContentResolver(), 255);    }    //開啟關閉自動調節亮度    public void offAuto(View view){        boolean autoBrightness = BrightnessTools.isAutoBrightness(getContentResolver());        if (autoBrightness) {            T.showLong(this, "關閉自動調節亮度");            BrightnessTools.stopAutoBrightness(this);        }else {            T.showLong(this, "開啟自動調節亮度");            BrightnessTools.startAutoBrightness(this);        }    }

 

android調節螢幕亮度