Android Open Source - camp-food-manager Ambient Light Manager






From Project

Back to project page camp-food-manager.

License

The source code is released under:

GNU General Public License

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Java Source Code

/*
 * Copyright (C) 2012 ZXing authors/*from ww  w.  j a v a2  s .  c o m*/
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.google.zxing.client.android;

import android.content.Context;
import android.content.SharedPreferences;
import android.hardware.Sensor;
import android.hardware.SensorEvent;
import android.hardware.SensorEventListener;
import android.hardware.SensorManager;
import android.preference.PreferenceManager;
import com.google.zxing.client.android.camera.CameraManager;
import com.google.zxing.client.android.camera.FrontLightMode;

/**
 * Detects ambient light and switches on the front light when very dark, and off
 * again when sufficiently light.
 * 
 * @author Sean Owen
 * @author Nikolaus Huber
 */
public final class AmbientLightManager implements SensorEventListener {

  private static final float TOO_DARK_LUX = 45.0f;
  private static final float BRIGHT_ENOUGH_LUX = 450.0f;

  private final Context context;
  private CameraManager cameraManager;
  private Sensor lightSensor;

  public AmbientLightManager(Context context) {
    this.context = context;
  }

  public void start(CameraManager cameraManager) {
    this.cameraManager = cameraManager;
    SharedPreferences sharedPrefs = PreferenceManager
        .getDefaultSharedPreferences(context);
    if (FrontLightMode.readPref(sharedPrefs) == FrontLightMode.AUTO) {
      SensorManager sensorManager = (SensorManager) context
          .getSystemService(Context.SENSOR_SERVICE);
      lightSensor = sensorManager.getDefaultSensor(Sensor.TYPE_LIGHT);
      if (lightSensor != null) {
        sensorManager.registerListener(this, lightSensor,
            SensorManager.SENSOR_DELAY_NORMAL);
      }
    }
  }

  public void stop() {
    if (lightSensor != null) {
      SensorManager sensorManager = (SensorManager) context
          .getSystemService(Context.SENSOR_SERVICE);
      sensorManager.unregisterListener(this);
      cameraManager = null;
      lightSensor = null;
    }
  }

  @Override
  public void onSensorChanged(SensorEvent sensorEvent) {
    float ambientLightLux = sensorEvent.values[0];
    if (cameraManager != null) {
      if (ambientLightLux <= TOO_DARK_LUX) {
        cameraManager.setTorch(true);
      } else if (ambientLightLux >= BRIGHT_ENOUGH_LUX) {
        cameraManager.setTorch(false);
      }
    }
  }

  @Override
  public void onAccuracyChanged(Sensor sensor, int accuracy) {
    // do nothing
  }

}




Java Source Code List

com.V4Creations.FSMK.campfoodmanager.adapter.ResultListViewAdapter.java
com.V4Creations.FSMK.campfoodmanager.db.CampFoodManagerDataBase.java
com.V4Creations.FSMK.campfoodmanager.db.DatabaseHelper.java
com.V4Creations.FSMK.campfoodmanager.db.GetAllStudensDetailsHelperAsynzTask.java
com.V4Creations.FSMK.campfoodmanager.db.GetDetailsHelperAsynzTask.java
com.V4Creations.FSMK.campfoodmanager.flash.Constants.java
com.V4Creations.FSMK.campfoodmanager.flash.Droid22Flashlight.java
com.V4Creations.FSMK.campfoodmanager.flash.Flashlight.java
com.V4Creations.FSMK.campfoodmanager.flash.FroyoLedFlashlight.java
com.V4Creations.FSMK.campfoodmanager.flash.HtcLedFlashlight.java
com.V4Creations.FSMK.campfoodmanager.flash.LedFlashlightReceiver.java
com.V4Creations.FSMK.campfoodmanager.flash.Moto21LedFlashlight.java
com.V4Creations.FSMK.campfoodmanager.fragment.MenuFragment.java
com.V4Creations.FSMK.campfoodmanager.interfaces.GetFullStudentsDetailsInterface.java
com.V4Creations.FSMK.campfoodmanager.interfaces.GetSingleItemDetailsInterface.java
com.V4Creations.FSMK.campfoodmanager.ui.CampFoodManagerMainActivity.java
com.V4Creations.FSMK.campfoodmanager.ui.PreferencesActivity.java
com.V4Creations.FSMK.campfoodmanager.util.BaseActivity.java
com.V4Creations.FSMK.campfoodmanager.util.Settings.java
com.google.zxing.client.android.AmbientLightManager.java
com.google.zxing.client.android.BeepManager.java
com.google.zxing.client.android.CaptureActivityHandler.java
com.google.zxing.client.android.DecodeFormatManager.java
com.google.zxing.client.android.DecodeHandler.java
com.google.zxing.client.android.DecodeHintManager.java
com.google.zxing.client.android.DecodeThread.java
com.google.zxing.client.android.FinishListener.java
com.google.zxing.client.android.InactivityTimer.java
com.google.zxing.client.android.IntentSource.java
com.google.zxing.client.android.Intents.java
com.google.zxing.client.android.ViewfinderResultPointCallback.java
com.google.zxing.client.android.ViewfinderView.java
com.google.zxing.client.android.camera.AutoFocusManager.java
com.google.zxing.client.android.camera.CameraConfigurationManager.java
com.google.zxing.client.android.camera.CameraManager.java
com.google.zxing.client.android.camera.FrontLightMode.java
com.google.zxing.client.android.camera.PreviewCallback.java
com.google.zxing.client.android.camera.exposure.DefaultExposureInterface.java
com.google.zxing.client.android.camera.exposure.ExposureInterface.java
com.google.zxing.client.android.camera.exposure.ExposureManager.java
com.google.zxing.client.android.camera.exposure.FroyoExposureInterface.java
com.google.zxing.client.android.camera.open.DefaultOpenCameraInterface.java
com.google.zxing.client.android.camera.open.GingerbreadOpenCameraInterface.java
com.google.zxing.client.android.camera.open.OpenCameraInterface.java
com.google.zxing.client.android.camera.open.OpenCameraManager.java
com.google.zxing.client.android.common.PlatformSupportManager.java
com.google.zxing.client.android.common.executor.AsyncTaskExecInterface.java
com.google.zxing.client.android.common.executor.AsyncTaskExecManager.java
com.google.zxing.client.android.common.executor.DefaultAsyncTaskExecInterface.java
com.google.zxing.client.android.common.executor.HoneycombAsyncTaskExecInterface.java