<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <Button
        android:id="@+id/bn1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentLeft="true"
        android:layout_alignParentTop="true"
        android:text="显示" />

    <Button
        android:id="@+id/bn2"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentTop="true"
        android:layout_centerHorizontal="true"
        android:text="隐藏" />
    
</RelativeLayout>

package com.example.titleprogressbar;

import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.Window;
import android.widget.Button;

public class MainActivity extends Activity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        //设置窗口特征，启用显示进度的进度条
        requestWindowFeature(Window.FEATURE_PROGRESS);
        //设置窗口特征，启用不显示进度的进度条
        requestWindowFeature(Window.FEATURE_INDETERMINATE_PROGRESS);
        setContentView(R.layout.activity_main);
        Button bn1=(Button) findViewById(R.id.bn1);
        Button bn2=(Button) findViewById(R.id.bn2);
        bn1.setOnClickListener(new OnClickListener(){
            @Override
            public void onClick(View v) {
            //显示不带进度的进度条
                setProgressBarIndeterminateVisibility(true);
                //显示带进度的进度条
                setProgressBarVisibility(true);
                //设置进度条的进度
                setProgress(4500);
            }
            
        });
        bn2.setOnClickListener(new OnClickListener(){

            @Override
            public void onClick(View v) {
                //隐藏不带进度的进度条
                setProgressBarIndeterminateVisibility(false);
                //隐藏带进度的进度条
                setProgressBarVisibility(false);
                
            }
            
        });
    }
}