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

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

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

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

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