小安卓

文件识别

image-20250306214301810

第一个是布局文件

image-20250306214405787

java文件

工程项目结构

project下有多个模块

project

app

manifests

内有俺的日哦的manifest.xml文件 andriod的运行配置文件

java

下面有三个com.example.myapp包 第一个存放当前模块的java源代码 后两个存放测试的java代码

res

drawable存放图形描述文件和图片文件

layout存放app页面的布局文件

mipmap存放app的启动图标

values目录存放常量定义文件 字符串常量strings.xml 像素常量dimens.xml等

gradle scripti

build.gradle

proguard-rules.pro

gradle.properties

settings.gradle

local.properties

创建activity

layout下创建xml文件

创建相关的javadiamagnetic

在andriodmainfest.xml注册页面配置

image-20250313205900894

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

<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"/>

</LinearLayout>

创建新的activity

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package com.example.myapplication;


import android.os.Bundle;

import androidx.activity.EdgeToEdge;
import androidx.annotation.Nullable;
import androidx.appcompat.app.AppCompatActivity;
import androidx.core.graphics.Insets;
import androidx.core.view.ViewCompat;
import androidx.core.view.WindowInsetsCompat;
public class MainActivitynew extends AppCompatActivity {

@Override
protected void onCreate(@Nullable Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_new);
//使用xml的布局
}
}

进入andriodmainfest.xml 注册新的activity

新注册的activity 并不是主activity 不用配置

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<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools">

<application
android:allowBackup="true"
android:dataExtractionRules="@xml/data_extraction_rules"
android:fullBackupContent="@xml/backup_rules"
android:icon="@mipmap/ic_launcher"
android:label="@string/app_name"
android:roundIcon="@mipmap/ic_launcher_round"
android:supportsRtl="true"
android:theme="@style/Theme.MyApplication"
tools:targetApi="31">
<activity
android:name=".MainActivity"
android:exported="true">
<intent-filter>
<action android:name="android.intent.action.MAIN" />

<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>

<activity android:name=".MainActivitynew" />
</application>

</manifest>

修改activity_main.xml

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<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout 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:id="@+id/main"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".MainActivity">

<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Hello World!"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent" />
<Button
android:layout_height="wrap_content"
android:layout_width="wrap_content"
tools:ignore="MissingConstraints"

android:id="@+id/button"

android:text="butt"/>

</androidx.constraintlayout.widget.ConstraintLayout>

注册了一个按钮

修改mainactivity

增加点击按钮事件实现跳转

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package com.example.myapplication;

import android.annotation.SuppressLint;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;

import androidx.activity.EdgeToEdge;
import androidx.appcompat.app.AppCompatActivity;
import androidx.core.graphics.Insets;
import androidx.core.view.ViewCompat;
import androidx.core.view.WindowInsetsCompat;

public class MainActivity extends AppCompatActivity {

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
EdgeToEdge.enable(this);
setContentView(R.layout.activity_main);
Button button = findViewById(R.id.button);
//按钮监听 点击 设置intent 实现跳转
button.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Intent intent = new Intent();
intent.setClass(MainActivity.this, MainActivitynew.class);
startActivity(intent);


}
});


}
}