Android 0 Basics Section 31st: Almost no, but to understand the absolutelayout absolute layout

Original: Android 0 basic Introductory section 31st: almost no but to understand the absolutelayout absolute layout

Prior to the basic study of Android development commonly used in four kinds of layout, the reason is to put absolutelayout in the back to learn, because in the actual development is rarely used, and in the high version has commented to delete is not recommended to use, then the purpose of this period of learning is to simply understand that there is such a layout, If you run into at least know what's going on.

I. Understanding Absolutelayout

Absolute layouts need to control the position of each control by specifying x, y coordinates, and the controls placed in that layout need to specify their exact coordinate values through android:layout_x and android:layout_y two properties and display them on the screen.

It is important to note that when using Absolutelayout as a layout container, the layout container no longer manages the location and size of the child components, requiring the developer to control it. With absolute layout, each subcomponent can specify the following two XML attributes.

• Layout_x: Specifies the x-coordinate of the subassembly.

• Layout_y: Specifies the y-coordinate of the subassembly.

Ii. examples

Next, learn the usage of absolutelayout using a simple example program.

Also using the Widgetsample project, continue to use the Activity_main.xml file in the app/main/res/layout/directory, where the following code snippet is populated:

<?XML version= "1.0" encoding= "Utf-8"?><Absolutelayoutxmlns:android= "Http://schemas.android.com/apk/res/android"Android:layout_width= "Match_parent"Android:layout_height= "Match_parent">    <ButtonAndroid:layout_width= "Wrap_content"Android:layout_height= "Wrap_content"android:layout_x= "0DP"android:layout_y= "0DP"Android:text= "Button 1" />    <ButtonAndroid:layout_width= "Wrap_content"Android:layout_height= "Wrap_content"android:layout_x= "40DP"android:layout_y= "40DP"Android:text= "button 2" />    <ButtonAndroid:layout_width= "Wrap_content"Android:layout_height= "Wrap_content"android:layout_x= "80DP"android:layout_y= "80DP"Android:text= "button 3" />    <ButtonAndroid:layout_width= "Wrap_content"Android:layout_height= "Wrap_content"android:layout_x= "120DP"android:layout_y= "120DP"Android:text= "button 4" /></Absolutelayout>

To run the program, you can see the interface effect shown:

It is important to note that in theory absolute layouts can be completed for any layout design, but the use of this layout is not advocated in actual engineering applications. Because using this layout requires not only a precise calculation of the size of each component, but also the effect of the application running on a different screen of the phone, it is generally not recommended to use absolute layout. We can generally use linearlayout weight weight + relativelayout to build our interface.

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Past period Summary share:

Android 0 Basics Introduction 1th: Android's past life

Android 0 Basics Section 2nd: Android system Architecture and application components those things

Android 0 Basics Section 3rd: Bring you up to talk about Android development environment

Android 0 Basics 4th: Installing and configuring the JDK correctly Ko fu the first trick

Android 0 Basics 5th: Use ADT bundles to easily meet the goddess

Android 0 Basics 6th: Configuration Optimization SDK Manager, official dating goddess

Android 0 Basics 7th: Take care of Android simulator and start the Sweet journey

Android 0 Basics 8th: HelloWorld, the starting point for my first trip

Android 0 Basics 9th: Android app, no code can be developed

Android 0 Basics Section 10th: Development IDE Big upgrade, finally ushered in Android Studio

Android 0 Basics Introductory Section 11th: Simple steps to take you to fly, run Android Studio project

Android 0 Basics 12th: Get familiar with the Android studio interface and start selling

Android 0 Basics 13th: Android Studio Configuration optimization to create a development tool

Android 0 Basics 14th: Using high-speed genymotion, stepping into the rocket era

Android 0 Basics Section 15th: Mastering the Android Studio project structure, sailing

Android 0 Basics Section 16th: Android User Interface Development overview

Android 0 Basics Section 17th: TextView Properties and Methods Daquan

Android 0 Basics Section 18th: EditText properties and how to use them

Android 0 Basics section 19th: Button usage explained

Android 0 Basics Section 20th: checkbox and RadioButton Usage Daquan

Android 0 Basics Section 21st: ToggleButton and switch usage Daquan

Android 0 Basics Section 22nd: ImageView's properties and methods Daquan

Android 0 Basics Section 23rd: ImageButton and Zoombutton use Daquan

Android 0 Basics Section 24th: Customize view simple to use to create your own controls

Android 0 Basics Section 25th: Simple and most commonly used linearlayout linear layouts

Android 0 Basics Section 26th: Two alignments, layout_gravity and gravity differ greatly

Android 0 Basics section 27th: Using padding and margin correctly

Android 0 Basics Section 28th: Easy to master relativelayout relative layout

Android 0 Basics 29th: Use tablelayout table layouts

Android 0 Basics 30th: Two minutes master Framelayout frame layout

Android 0 Basics Section 31st: Almost no, but to understand the absolutelayout absolute layout