Android Open Source - checkin Check In Handler

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License

The source code is released under:

# License Copyright ? 2014 Sam Whited Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the ?Software??), to deal ...

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Java Source Code

package com.samwhited.checkin;
/*w w  w. ja  v  a  2s . co m*/
import android.app.Activity;
import android.content.Context;
import android.os.Handler;
import android.os.Message;
import android.widget.Toast;

import java.lang.ref.WeakReference;


public final class CheckInHandler extends Handler {

  public static interface Handlable {
    void updateViews();
  }

  /**
   * Messages which can be sent to the handler.
   */
  public final static int SHOW_TOAST = 0;
  public final static int UPDATE_VIEW = 1;
  public final static int DISABLE_UPLOAD = 2;
  public final static int ENABLE_UPLOAD = 3;

  /**
   * Hold a weak reference to the activity to prevent a memory leak where the activity would not
   * be garbage collected if a long running thread was using this handler.
   */
  private final WeakReference<Activity> mActivity;

  /**
   * Constructor for our custom handler that takes in the outer activity.
   *
   * @param activity The activity to handle events for.
   */
  public CheckInHandler(final Activity activity) {
    mActivity = new WeakReference<>(activity);
  }

  public Context getContext() {
    return mActivity.get();
  }

  /**
   * Handle a message sent from the networking thread.
   *
   * @param msg The message object.
   */
  @Override
  public void handleMessage(final Message msg) {
    if (msg == null) {
      return;
    }

    final Activity activity = mActivity.get();
    switch (msg.arg1) {
      case SHOW_TOAST:
        if (msg.obj != null) {

          final String text = msg.obj.toString();
          if (text != null && !text.isEmpty() && activity != null) {
            Toast.makeText(activity, text, Toast.LENGTH_LONG).show();
          }
        }
        break;
      case UPDATE_VIEW:
        if (activity != null) {
          try {
             ((Handlable)activity).updateViews();
          } catch (final ClassCastException ignored) {
          }
        }
        break;
    }
  }
}

Java Source Code List