省电模式部分代码

以下皆在android 4.3 平台上测试通过

1.将 休眠时间调制 15秒：

Settings.System.putInt(getContentResolver(),android.provider.Settings.System.SCREEN_OFF_TIMEOUT,-1);
权限：

2.关闭蓝牙：

BluetoothAdapter bluetoothadapter = BluetoothAdapter.getDefaultAdapter();

        bluetoothadapter.disable();

3.关闭wifi

WifiManager manager =null;

    manager = (WifiManager)context.getSystemService(Context.WIFI_SERVICE);

    manager.setWifiEnabled(false);

4.降低屏幕亮度

这个比较复杂：

在主函数里添加：

try {  

        screenMode = Settings.System.getInt(getContentResolver(), Settings.System.SCREEN_BRIGHTNESS_MODE);  

        Log.i(TAG, "screenMode = " + screenMode);  

        // 获得当前屏幕亮度值 0--255  

        screenBrightness = Settings.System.getInt(getContentResolver(), Settings.System.SCREEN_BRIGHTNESS);  

        Log.i(TAG, "screenBrightness = " + screenBrightness);  

        // 如果当前的屏幕亮度调节调节模式为自动调节，则改为手动调节屏幕亮度  

        if (screenMode == Settings.System.SCREEN_BRIGHTNESS_MODE_AUTOMATIC) {  

            setScreenMode(Settings.System.SCREEN_BRIGHTNESS_MODE_MANUAL);  

        }  

        // 设置屏幕亮度值为最大值0  

        setScreenBrightness(0.0F);  

        } catch (SettingNotFoundException e) {  

            // TODO Auto-generated catch block  

            e.printStackTrace();  

        }  

然后添加两个执行函数

 private void setScreenMode(int value) {  

        Settings.System.putInt(getContentResolver(), Settings.System.SCREEN_BRIGHTNESS_MODE, value);  

    }  

    private void setScreenBrightness(float value) {  

        Window mWindow = getWindow();  

        WindowManager.LayoutParams mParams = mWindow.getAttributes();  

        float f = value / 255.0F;  

        mParams.screenBrightness = f;  

        mWindow.setAttributes(mParams);  

  

        // 保存设置的屏幕亮度值  

        Settings.System.putInt(getContentResolver(), Settings.System.SCREEN_BRIGHTNESS, (int) value);  

    }  

还有private 几个变量 

private int screenMode;  

    private static final String TAG = "ScreenLuminance";  

    private int screenBrightness;  

亮度部分需要权限： <uses-permission android:name="android.permission.WRITE_SETTINGS"/>