Android Cold weapons tools

The code address is as follows:
Http://www.demodashi.com/demo/12612.html

Objective

AndroidDevelopment is inevitable is UI the preview and adjustment, in general, is directly run see the effect, or the use AS of the preview preview, but this also brings a small problem, that is, your test content will follow the code is packaged into apk the If you do not do fault-tolerant processing, it is likely that the test content will be presented to the user.

There are some lists that do not support the preview effect, for example ListView .

In fact, the Android old has a tools namespace, as a development fast to a year, I recently saw an article found this tools big use, here to make a note.

Look directly at the effect, the most clear:

XMLThe code in a few lines, but the right side of the preview effect is very direct, there is that the data is not hit apk , direct operation is not any effect, this is the point! The relevant code has been submitted to Github : Android Tools

Project Files Directory

Preliminary use

Since it is a namespace, it must be XML declared at the beginning.

xmlns:tools="http://schemas.android.com/tools"

Similar to

xmlns:android="http://schemas.android.com/apk/res/android"

Then you can use tools the related properties. Property features a lot of very full, I will introduce the commonly used, the end of the text will be affixed to the relevant article links.

View related

First of all, from view the relevant, in XML view the android value of any attribute can be directly replaced tools , so that you can achieve real-time preview, and will not show after the formal deployment. A bit similar to dataBinding the default attributes in, TextView for example.

//1. 原生android:text="test text"//2. databindingandroid:text=‘@{viewModel.content, default="test text"}‘//3. toolstools:text="test text"

previewThe effect is the same, but in addition to 1, the other run effect is determined by the content set in the code, really do the test preview.

Previously also said, view the other properties it supports.

Context

Pass

tools:context="com.xiaweizi.androidtoolsexample.CommonActivity"

The way in which the root office is referenced, the primary function declares that the layout file is associated by default Activity , and the Activity full package name of the quoted class is passed. You can then turn on some of the features associated with it. For example, in a daily click event, you can directly XML declare onClick the method name in, and then there will be the wrong lint hint, you need to create a change in the Activity method, followed AS by the smart guidance, you can create the corresponding method. Click on the event's handling to put it inside.

Showin

tools:showIn="@layout/activity_other"

When used include or merge , the inner layout is not previewed to the outer layer of the layout. It showIn can be displayed directly with the outer layout by linking to the outer layout.

Layout

Also in the XML reference fragment layout is not preview the effect:

That through:

<fragment    android:id="@+id/fragment"    android:name="com.xiaweizi.androidtoolsexample.CommonFragment"    android:layout_width="match_parent"    android:layout_height="match_parent"    tools:layout="@layout/layout_fragment_test" />

To achieve the preview effect.

Advanced use

toolsApart from the above features, the more powerful is the support list of the preview display, that is, the effect of the beginning of the article preview, the most obvious effect is ListView .

Listview

// 1. 列表内容的布局tools:listitem="@layout/list_content"// 2. 头布局的预览展示tools:listheader="@layout/list_header"// 3. 脚布局的预览展示tools:listfooter="@layout/list_footer"

When you start using it, you find it doesn't work, and then you find that you need to set it up ListView id and it takes effect immediately.

Gridview

The same applies to GridView .

Recyclerview

Speaking of RecyclerView the first I thought that only supported itemCount the settings, and later thanks to the small partners to mention the ANDROIDTOOLSEXAMPLE/ISSUES/1, I found that can support complex list display!

// 1. 设置展示 item 的数量tools:itemCount="6"// 2. 设置布局方式 三种模式可以选择// GridLayoutManager// LinearLayoutManager// StaggeredGridLayoutManagertools:layoutManager="GridLayoutManager"// 3. item 的布局tools:listitem="@layout/list_content"// 4 设置布局的方向tools:orientation="horizontal"// 5. 设置布局横、纵的列数tools:spanCount="2"

Sample

Some people will be curious about the list of data which came, did not see you set up, unexpectedly can do every piece of data is different. Sir Don't worry, the next step is to introduce @tools:sample/* the powerful features as placeholder data for the preview view. See the introduction of the use of a crossing net.

Various types of data are supported for construction, and here I take the example as a showcase:

Each time you use it, you will randomly change the values, see the list for more information.

Do you think it's over? too young! We can also construct false data by ourselves, except for the data support that is natively given.

You can create sample data it directly, and then you can create text or json data. If it is json data, you must run it before you can use it. Then look at how to use it.

Create the json data first:

{  "data": [    {      "name": "张三",      "phone": "@tools:sample/us_phones",      "time": "@tools:sample/date/hhmmss",      "avatar": "@tools:sample/avatars"    },    {      "name": "李四",      "phone": "@tools:sample/us_phones",      "time": "@tools:sample/date/hhmmss",      "avatar": "@tools:sample/avatars"    },    {      "name": "赵五",      "phone": "@tools:sample/us_phones",      "time": "@tools:sample/date/hhmmss",      "avatar": "@tools:sample/avatars"    },    {      "name": "王二麻",      "phone": "@tools:sample/us_phones",      "time": "@tools:sample/date/hhmmss",      "avatar": "@tools:sample/avatars"    }  ]}

Then directly in XML , through @sample/ the way to get the data.

Use and preview as shown.

Summarize

getThis skill, do not say how much use it, at least can improve the development efficiency, and reduce the test code to deploy to the wrong rate of the line, I believe it will help you!

Thank

Tools Official Documentation

namespace Introduction

Tools are useful.

Android Cold weapons tools

The code address is as follows:
Http://www.demodashi.com/demo/12612.html

Note: This copyright belongs to the author, by the demo master, refused to reprint, reprint need the author authorization

Android Cold weapons tools