<LinearLayout 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"

     android:layout_marginLeft="10dp"

     android:orientation="vertical" >

    <Button

         android:id="@+id/btn1"

         android:layout_width="wrap_content"

         android:layout_height="wrap_content"

         android:text="显示" />

     <Button

         android:id="@+id/btn2"

         android:layout_width="wrap_content"

         android:layout_height="wrap_content"

         android:text="隐藏" />

 </LinearLayout>

 package com.example.testdemo;

 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);// 以下两句代码必须写在setContentView之前否则不起作用

         requestWindowFeature(Window.FEATURE_PROGRESS);// 进度指示器功能

         requestWindowFeature(Window.FEATURE_INDETERMINATE_PROGRESS); // 不确定的进度

         setContentView(R.layout.activity_main);

         Button btn1 = (Button) findViewById(R.id.btn1);

         Button btn2 = (Button) findViewById(R.id.btn2);

         // 展示标题栏进度条

         btn1.setOnClickListener(new OnClickListener() {

             @Override

             public void onClick(View v) {

                 setProgressBarVisibility(true);

                 setProgressBarIndeterminateVisibility(true);

             }

         });

         // 隐藏标题栏进度条

         btn2.setOnClickListener(new OnClickListener() {

             @Override

             public void onClick(View v) {

                 setProgressBarVisibility(false);

                 setProgressBarIndeterminateVisibility(false);

             }

         });

     }

 }