11 2020 档案

摘要：<?xml version="1.0" encoding="utf-8"?> <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:app="http://schemas.android.co 阅读全文

摘要：activity_main <?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="ma 阅读全文

摘要：MainActivity package com.example.myapplication; import androidx.appcompat.app.AppCompatActivity; import android.app.Activity; import android.content.I 阅读全文

摘要：MainActivity package com.example.myapplication; import androidx.appcompat.app.AppCompatActivity; import android.annotation.SuppressLint; import androi 阅读全文