如何传递的AttributeSet作为参数 [英] How to pass AttributeSet as a parameter

问题描述

我试图落实P​​edram从<一个更新的解决方案href=\"http://stackoverflow.com/questions/21333866/create-a-circular-progressbar-in-android-which-rotates-on-circular-path\">this回答，但我不知道创建 CircleProgressBar 的新实例。它需要的AttributeSet作为参数传递，但如何得到它？

  CircleProgressBar circleProgressBar =新CircleProgressBar（MainActivity.this，？）;
 

解决方案

在一个视图是通过XML定义布局虚增的AttributeSet 构造被使用。如果你在code构造一个，你应该使用单参数的构造函数（例如新CircleProgressBar（MainActivity.this））。如果没有定义单参数的构造函数，你只需要添加它。你只需要添加一些的getter / setter方法​​的属性，如果你希望能够从Java code内完全构造它。

另外，只是单个项目定义布局XML（例如名称view_progress_circle.xml）：

 ＆LT; com.your.packagename.CircleProgressBar
    机器人：layout_width =100dp
    机器人：layout_height =100dp
    //等等。这里添加其他属性
    /＆GT;
 

然后在code，与创建它：

  CircleProgressBar栏=（CircleProgressBar）LayoutInflater.from（MainActivity.this）
        .inflate（R.layout.view_progress_circle，父母，假的）：
 

其中，父是的ViewGroup 你要附加视图。

I'm trying to implement updated solution by Pedram from this answer, but I don't know to create a new instance of CircleProgressBar. It requires AttributeSet to be passed as a parameter, but how to get it?

CircleProgressBar circleProgressBar = new CircleProgressBar(MainActivity.this, ?);

解决方案

The AttributeSet constructor is used when a view is inflated through a layout defined in XML. If you're constructing one in code, you should use the single argument constructor (e.g. new CircleProgressBar(MainActivity.this)). If the single-argument constructor is not defined, you just need to add it. You'll just need to add some getters/setters for the properties if you want to be able to construct it entirely from within Java code.

Alternately, just define a layout XML (example name view_progress_circle.xml) with a single item:

<com.your.packagename.CircleProgressBar
    android:layout_width="100dp"
    android:layout_height="100dp"
    // etc. add other attributes here
    />

Then in code, create it with:

CircleProgressBar bar = (CircleProgressBar) LayoutInflater.from(MainActivity.this)
        .inflate(R.layout.view_progress_circle, parent, false):

where parent is the ViewGroup you're going to attach the view to.

这篇关于如何传递的AttributeSet作为参数的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！