常用属性

1. max：进度条的最大值
2. progress：进度条已完成进度值
3. indeterminate：如果设置成true，则进度条不精确显示进度
4. style="?android:attr/progressBarStyleHorizontal"：水平进度条

项目结构

主要代码

mainActivity.java

package com.study.myprogressbar;

import androidx.appcompat.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.ProgressBar;

public class MainActivity extends AppCompatActivity {

    private ProgressBar progressBar;
    private ProgressBar progressBar1;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        progressBar = findViewById(R.id.pb);
        progressBar1 = findViewById(R.id.pb1);
    }

    public void leoClick(View view) {
        //GONE：隐藏，VISIBLE：显示
        if (progressBar.getVisibility() == View.GONE) {
            progressBar.setVisibility(View.VISIBLE);
        } else {
            progressBar.setVisibility(View.GONE);
        }
    }

    public void load(View view) {
        int progress = progressBar1.getProgress();  //获取当前的进度值
        progress += 10; //每点一下加10
        progressBar1.setProgress(progress);
    }
}

activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical">

    <ProgressBar
        android:id="@+id/pb"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content" />

    <Button
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:onClick="leoClick"
        android:text="显示隐藏进度条" />

    <ProgressBar
        android:id="@+id/pb1"
        style="?android:attr/progressBarStyleHorizontal"
        android:layout_width="300dp"
        android:layout_height="wrap_content"
        android:max="100" />

    <Button
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:onClick="load"
        android:text="模拟下载" />

    <ProgressBar
        style="?android:attr/progressBarStyleHorizontal"
        android:layout_width="300dp"
        android:layout_height="wrap_content"
        android:indeterminate="true"
        android:max="100" />
</LinearLayout>