[游戏开发]进度条学习

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package com.example.jingdutiao;

import androidx.annotation.NonNull;
import androidx.appcompat.app.AppCompatActivity;

import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.view.View;
import android.widget.Button;
import android.widget.ProgressBar;
import android.widget.TextView;

public class MainActivity extends AppCompatActivity {

    private ProgressBar progress;
    private TextView tv_show;
    private Button btn_down;
//    进度条当前进度值
    private int pb = 0;

    Handler handler = new Handler(){
        @Override
        public void handleMessage(@NonNull Message msg) {
            super.handleMessage(msg);
            tv_show.setText(msg.arg1+"%");
            progress.setProgress(msg.arg1);
        }
    };
    Runnable runnable = new Runnable() {
        @Override
        public void run() {
            while (pb<=100){
                Message message = Message.obtain();
                message.arg1 = pb;
                handler.sendMessage(message);
                try {
                    Thread.sleep(1000);
                    pb++;
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }
            }
        }
    };

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        init();
        btn_down.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                Thread thread = new Thread(runnable);
                thread.start();
            }
        });
    }

    public void init(){
        progress = findViewById(R.id.progress);
        tv_show = findViewById(R.id.tv_show);
        btn_down = findViewById(R.id.btn_down);
    }
}

<?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">

<!--    转圈进度条-->
    <ProgressBar
        android:layout_width="match_parent"
        android:layout_height="wrap_content"/>

<!--    条形进度条-->
    <ProgressBar
        style="@style/Widget.AppCompat.ProgressBar.Horizontal"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"/>

<!--    progress设置当前进度，secondaryProgress设置缓存进度-->
    <ProgressBar
        style="@style/Widget.AppCompat.ProgressBar.Horizontal"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:progress="20"
        android:secondaryProgress="40"/>

    <ProgressBar
        android:id="@+id/progress"
        style="@style/Widget.AppCompat.ProgressBar.Horizontal"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:progress="0" />

    <TextView
        android:id="@+id/tv_show"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:gravity="center"
        android:textSize="20dp"/>
    <Button
        android:id="@+id/btn_down"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="下载"/>
</LinearLayout>