Android进度条及显示隐藏

一：进度条控件

<ProgressBar>

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

 

 

2,新建一个控件

 

 3，在java目录下Activity中代码

package com.sdbi.myapplication4;
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;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
         progressBar = findViewById(R.id.pd);
    }
    public void leoClick(View view) {
      if (progressBar.getVisibility()==View.GONE){
          progressBar.setVisibility(View.VISIBLE);
      }else {
          progressBar.setVisibility(View.GONE);
      }
    }
}

单击控件 进行显示隐藏进度条