Android Studio实现进度条效果

<?xml version=\"1.0\" encoding=\"utf-8\"?>
<RelativeLayout 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=\".ProgressBarActivity\">

    <ProgressBar
        android:id=\"@+id/pb_determinate\"
        android:layout_width=\"match_parent\"
        android:layout_height=\"wrap_content\"
        style=\"@android:style/Widget.ProgressBar.Horizontal\"
        android:backgroundTint=\"@color/purple_200\"

        android:progress=\"25\"
        android:max=\"100\"
        android:layout_centerVertical=\"true\"
        />
    <TextView
        android:layout_width=\"match_parent\"
        android:layout_height=\"wrap_content\"
        android:text=\"ProgressBar\"
        android:textSize=\"28sp\"
        android:gravity=\"center\"
        android:layout_below=\"@+id/pb_determinate\"
        />
</RelativeLayout>

package com.example.a18101352;

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

import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.widget.ProgressBar;

import java.util.Random;

public class MainActivity extends AppCompatActivity {


    private ProgressBar progressBar;
    private int maxProgress;
    private int currentProgress = 0;

    private Handler mHandler = new Handler(){
        /**
         * Subclasses must implement this to receive messages.
         *
         * @param msg
         */
        @Override
        public void handleMessage(@NonNull Message msg) {
            super.handleMessage(msg);
            switch (msg.what){
                case 0:
                    progressBar.setProgress(currentProgress);
                    break;
            }
        }
    };


    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_progress_bar);
        progressBar = findViewById(R.id.pb_determinate);
        maxProgress = progressBar.getMax();
    }

    @Override
    protected void onStart(){
        super.onStart();
        new Thread() {

            private Random random;

            @Override
            public void run(){
                while(true){
                    try {
                        for(int i = 0; i < maxProgress; ++i){
                            //间隔一秒
                            Thread.sleep(1000);
                            random = new Random();
//                            currentProgress += 10;
//                            if(currentProgress > maxProgress){
//                                break;
//                            }
                            //获取一个随机数给到currentProgress然后显示出来
                            currentProgress = random.nextInt(100);
                            mHandler.sendEmptyMessage(0);
                        }
                    }
                    catch (InterruptedException e){
                        e.printStackTrace();
                    }
                }
            }
        }.start();
    }
}