＆QUOT;本＆QUOT;关键字JAVA / Android的编程？

问题描述

有是在下面，我想了解任何人可以帮助我了code块。

 公共类MainActivity扩展ActionBarActivity实现GestureDetector.OnGestureListener，GestureDetector.OnDoubleTapListener {
  保护无效的onCreate（）{
      私人GestureDetectorCompat gestureDetector;
      this.gestureDetector =新GestureDetectorCompat（这一点，这一点）;
      gestureDetector.setOnDoubleTapListener（本）;   }
}
 

解决方案

的这个关键字，它存在于许多OOP语言，是的当前实例的引用对象，你都包含在内存中。

您例如：

  this.gestureDetector =新GestureDetectorCompat（这一点，这一点）;
 

您基本上是说：
这个实例 - 访问 gestureDetector 等于 GestureDetectorCompat 的新实例构造与2 PARAMATERS，在这种情况下，他们两位 MainActivity 的这个实例的引用。

随着人们都在说，这是一个根本性的本金和可能更利于您与移动到Android之前构建在Java中奠定坚实的基础开始。

There is a block of code which is given below which i am trying to understand can anybody help me.

public class MainActivity extends ActionBarActivity implements GestureDetector.OnGestureListener, GestureDetector.OnDoubleTapListener {
  protected void onCreate(){
      private GestureDetectorCompat gestureDetector;
      this.gestureDetector = new GestureDetectorCompat(this,this);
      gestureDetector.setOnDoubleTapListener(this);

   }
}

解决方案

The this keyword, which exists in many OOP languages, is a reference to the current instance of the object in which you are contained in memory..

Your example:

this.gestureDetector = new GestureDetectorCompat(this,this);

You are basically saying:This instance - access gestureDetector is equal to a new instance of GestureDetectorCompat that is constructed with 2 paramaters, in this case, both of them references to this instance of MainActivity.

As people are saying, this is a fundamental principal and it may be more beneficial for you to start with building a strong foundation in Java before moving on to Android.

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