在Android中如何使用Studio实现进度条

这篇文章主要介绍在Android中如何使用Studio实现进度条，文中介绍的非常详细，具有一定的参考价值，感兴趣的小伙伴们一定要看完！

xml代码

<?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"
        
        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>

java代码

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();
    }
}

线程里的for循环可以去掉，循环是测试定时加长进度条设计的。

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