Android Open Source - camp-food-manager Htc Led Flashlight

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License

The source code is released under:

GNU General Public License

Java Source Code

/*
 * Copyright (C) 2010 Sergej Shafarenka, beworx.com
 *//  ww w .  j  a va 2  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.V4Creations.FSMK.campfoodmanager.flash;

import java.io.BufferedReader;
import java.io.File;
import java.io.FileReader;
import java.io.FileWriter;

import android.content.Context;
import android.util.Log;

public class HtcLedFlashlight implements Flashlight {

  private static final String TAG = "qs.htcled";
  private static final String PATH = "/sys/devices/platform/flashlight.0/leds/flashlight/brightness";
  private static final String ON = "126";
  private static final String OFF = "0";
  
  private File mFile;
  
  public HtcLedFlashlight() {
    mFile = new File(PATH);
  }
  
  public boolean isOn(Context context) {
    String value = readValue();
    if (value != null && value.length() > 0) {
      return !OFF.equals(value);
    } else {
      return false;
    }
  }

  public void setOn(boolean on, Context context) {
    writeValue(on ? ON : OFF);
  }

  private String readValue() {
    BufferedReader br = null;
    try {
      br = new BufferedReader(new FileReader(mFile));
      String value = br.readLine();
      return value.trim();
    } catch (Exception e) {
      return null;
    } finally {
      if (br != null) {
        try {
          br.close();
        } catch (Exception e2) {
          // ignore
        }
      }
    }
  }
  
  private boolean writeValue(String value) {
    FileWriter fw = null;
    try {
      fw = new FileWriter(mFile);
      fw.write(value);
      
      if (Constants.DEBUG) {
        Log.d(TAG, "set brightness: " + value);
      }
      
      return true;
    } catch (Exception e) {
      return false;
    } finally {  
      if (fw != null) {
        try {
          fw.close();
        } catch (Exception e2) {
          // ignore
        }
      }
    }
  }

  public boolean isSupported(Context context) {
    boolean supported = mFile.exists();
    if (supported) {
      setOn(true, context);
      supported = isOn(context);
      setOn(false, context);
    }
    Log.d(TAG, "isSupported: " + supported);
    return supported;
  }

  public int getType() {
    return TYPE_HTC;
  }
  
}

Java Source Code List

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