五、ProgressBar（进度条）

max：进度条的最大值

progress：进度条已完成进度值

indeterminate：如果设置成true，则进度条不精确显示进度

style="?android:attr/progressBarStyleHorizontal"：水平进度条

ui页面源码示例

<?xml version="1.0" encoding="utf-8"?>


    

    
    

    
    
    

    
    

　　后台代码示例

package com.example.myprogressbae;

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 progressBarLoad;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        progressBar = findViewById(R.id.Pro);

        progressBarLoad = findViewById(R.id.ProShuPing);
    }

    //显示隐藏进度条
    public void leoClink(View view) {

        if (progressBar.getVisibility()==View.GONE)
        {
            progressBar.setVisibility(View.VISIBLE);
        }
        else
        {
            progressBar.setVisibility(View.GONE);
        }

    }

    //模拟下载
    public void leoLoad(View view) {
        int progress = progressBarLoad.getProgress();
        progress+=10;
        progressBarLoad.setProgress(progress);
    }
}

　　效果图片