My second Android application-优快云博客

界面组成：

功能代码：

import android.os.Bundle
import android.view.View
import android.widget.Button
import android.widget.EditText
import android.widget.ImageView
import android.widget.ProgressBar
import android.widget.TextView
import android.widget.Toast
import androidx.activity.enableEdgeToEdge
import androidx.appcompat.app.AlertDialog
import androidx.core.view.ViewCompat
import androidx.core.view.WindowInsetsCompat

class MainActivity : BaseActivity() {
    private lateinit var editText: EditText
    private lateinit var viewText: TextView

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        enableEdgeToEdge()
        setContentView(R.layout.activity_main)
        ViewCompat.setOnApplyWindowInsetsListener(findViewById(R.id.main)) { v, insets ->
            val systemBars = insets.getInsets(WindowInsetsCompat.Type.systemBars())
            v.setPadding(systemBars.left, systemBars.top, systemBars.right, systemBars.bottom)
            insets
        }
        //以上为Android Studio自动生成

        viewText = findViewById<TextView>(R.id.secondTV)
        editText = findViewById<EditText>(R.id.editText)
        val button = findViewById<Button>(R.id.button)
        val image = findViewById<ImageView>(R.id.imageView)
        val progressBarH = findViewById<ProgressBar>(R.id.progressBarH)
        val progressBar = findViewById<ProgressBar>(R.id.progressBar)

        button.setOnClickListener() {
            val message = editText.text.toString()
            //设置图片素材
            image.setImageResource(R.drawable.tzuyu)

            if(message == "") {
                Toast.makeText(this, R.string.warning, Toast.LENGTH_SHORT).show()
            } else {
                viewText.text = getString(R.string.greeting, "main", message)
                //设置进度条可见性，默认为不可见
                if (progressBar.visibility != View.VISIBLE) {
                    progressBar.visibility = View.VISIBLE
                }
                //设置警告对话框
                AlertDialog.Builder(this).apply {
                    setTitle("This is a Diaglog")    //标题
                    setMessage("Maybe there's something wrong")    //讯息
                    //设置正确按钮及其动作
                    setPositiveButton("OK") { dialog, which ->
                        progressBar.visibility = View.GONE
                    }
                    //设置正确按钮及其动作
                    setNegativeButton("Cancel") { dialog, which ->
                    }
                    show()
                }
                /*if (progressBar.visibility != View.VISIBLE) {
                    progressBar.visibility = View.VISIBLE
                }
                //设置条状进度条，每点击一次+10进度
                //进度满时关闭进度条，并将进度清理
                progressBarH.progress = progressBarH.progress + 10
                if (progressBarH.progress == progressBarH.max) {
                    progressBarH.visibility = View.GONE
                    progressBarH.progress = 0
                }*/
            }
        }
    }
}