Android Open Source - PlayerHater Headphone Button Gesture Helper

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License

The source code is released under:

Apache License

Java Source Code

/*******************************************************************************
 * Copyright 2013 Chris Rhoden, Rebecca Nesson, Public Radio Exchange
 * //w w w  .  ja v a  2 s.  c  om
 * 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 org.prx.playerhater.broadcast;

import android.content.Context;
import android.os.Handler;
import android.os.Message;
import android.view.KeyEvent;

class HeadphoneButtonGestureHelper {

  private static final int BUTTON_PRESSED = 0;
  private static final int PLAY_PAUSE = 1;
  private static final int NEXT = 2;
  private static final int PREV = 3;
  private static final int MILISECONDS_DELAY = 250;
  public static final String TAG = "GESTURES";

  private long mLastEventTime = 0;
  private int mCurrentAction = 1;
  private static Context lastContext;

  private final Handler mHandler = new ButtonHandler(this);
  private RemoteControlButtonReceiver mMediaButtonReceiver;

  public void onHeadsetButtonPressed(long eventTime, Context context) {
    if (eventTime - mLastEventTime <= MILISECONDS_DELAY + 100) {
      mCurrentAction += 1;
      if (mCurrentAction > 3) {
        mCurrentAction = 1;
      }
      mHandler.removeMessages(BUTTON_PRESSED);
    }
    lastContext = context;
    mLastEventTime = eventTime;
    mHandler.sendEmptyMessageDelayed(BUTTON_PRESSED, MILISECONDS_DELAY);
  }

  public void setReceiver(RemoteControlButtonReceiver receiver) {
    mMediaButtonReceiver = receiver;
  }

  private static class ButtonHandler extends Handler {

    private final HeadphoneButtonGestureHelper mButtonGestureHelper;

    private ButtonHandler(HeadphoneButtonGestureHelper ctx) {
      mButtonGestureHelper = ctx;
    }

    @Override
    public void dispatchMessage(Message message) {
      switch (mButtonGestureHelper.mCurrentAction) {

      case PLAY_PAUSE:
        mButtonGestureHelper.mMediaButtonReceiver
            .onRemoteControlButtonPressed(
                KeyEvent.KEYCODE_MEDIA_PLAY_PAUSE, lastContext);
        break;
      case NEXT:
        mButtonGestureHelper.mMediaButtonReceiver
            .onRemoteControlButtonPressed(
                KeyEvent.KEYCODE_MEDIA_NEXT, lastContext);
        break;
      case PREV:
        mButtonGestureHelper.mMediaButtonReceiver
            .onRemoteControlButtonPressed(
                KeyEvent.KEYCODE_MEDIA_PREVIOUS, lastContext);
        break;
      }
      mButtonGestureHelper.mLastEventTime = 0;
      mButtonGestureHelper.mCurrentAction = 1;
    }
  }

}

Java Source Code List

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