How to use Android Studio

This article mainly explains how to use Android Studio

step:

1. Create a project

First click new - new project to create a new project

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Select the Android template you want to create, it is recommended to select empty activity (empty template), and then next

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Name: Give your project a name
API level: Select the version of the Android virtual machine, the lower the version, the faster it will run
For the rest, just follow the default, click finish
(Because the version is different, the order of step 2 and step 3 may be exchanged, just pay attention to it)

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The android project is created and contains three main files
Activity: Provides the interaction between the user and the screen, so that the user can operate, and implement the main Java code in it
activity_main.xml: layout file, the view displayed by the Android UI interface, all controls are designed here
AndroidManifest.xml: The manifest file of the Android application, which is the description file of the entire Android application

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2. Introductory test

We double-click to enter activity_main.xml
First change android.support.constraint.ConstraintLayout to LinerLayout linear, which means a horizontal structure
And adding android:orientation="vertical" means to place all components vertically

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    tools:context=".MainActivity">
</LinearLayout>

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Next add a text Testview and a button Button

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    tools:context=".MainActivity">
    <TextView
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="学习安卓，你准备好了吗"
        android:id="@+id/tv_android"/>
    <Button
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="准备好了"
        android:id="@+id/bt_android"
        android:onClick="Welcome"/>
</LinearLayout>

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Note: In order for Xiaobai to develop good habits, the id of each control must be rigorous, and he will know what it means when he sees it. It is best not to contain numbers.

Click preview on the right to display the view

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Double-click to enter Mainactivity, we intend to click the button to pop up toast

public class MainActivity extends AppCompatActivity {
    
     
   

    @Override
    protected void onCreate(Bundle savedInstanceState) {
    
     
   
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
    }
    public void Welcome(View view) {
    
     
   
        Toast.makeText(this, "欢迎来到安卓世界", Toast.LENGTH_SHORT).show();
    }
}

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Note: setContentView(R.layout.activity_main); this sentence is layout binding

3. Open the phone simulator

You don’t need to actually download it to the phone, you can see the realization effect of the APP we wrote directly in the simulator
Internet connection required
Click the triangle (run APP) button, then create a new simulator, select the option in the picture (choose a low resolution, run fast), and then next

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Next, select the selection selected in the figure, and then proceed to next

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Give your emulator a name and click finish

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4. Effect display

Click run, it takes a while
Click the button, "Welcome to the Android world" pops up

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So far the experiment is successful

There may be many friends who don't know what R is?

R is a class index class to index all files under the r file The index of the resource directory finds the corresponding static member through the index number

Hope it can help beginners

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For novices, it may be difficult to install Android Studio. You can watch the following video and learn to install and run step by step.

Android Studio installation tutorial

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With the learning of the Java stage, it is recommended to focus on video learning at this stage and supplement it with books to check for omissions. If you focus on books, you can type codes based on book explanations, supplemented by teaching videos to check for omissions. If you encounter problems, you can go to Baidu. Generally, many people will encounter problems when getting started, and they will give better answers.

It is necessary to master basic knowledge points, such as how to use the four major components, how to create a Service, how to layout, simple custom View, animation, network communication and other common technologies.

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