1 <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
 2     xmlns:tools="http://schemas.android.com/tools"
 3     android:layout_width="match_parent"
 4     android:layout_height="match_parent"
 5     android:layout_marginLeft="10dp"
 6     android:orientation="vertical" >
 7 
 8    <Button
 9         android:id="@+id/btn1"
10         android:layout_width="wrap_content"
11         android:layout_height="wrap_content"
12         android:text="顯示" />
13 
14     <Button
15         android:id="@+id/btn2"
16         android:layout_width="wrap_content"
17         android:layout_height="wrap_content"
18         android:text="隱藏" />
19 
20 </LinearLayout>

 1 package com.example.testdemo;
 2 
 3 import android.app.Activity;
 4 import android.os.Bundle;
 5 import android.view.View;
 6 import android.view.View.OnClickListener;
 7 import android.view.Window;
 8 import android.widget.Button;
 9 
10 public class MainActivity extends Activity {
11 
12     @Override
13     protected void onCreate(Bundle savedInstanceState) {
14         super.onCreate(savedInstanceState);// 以下兩句代碼必須寫在setContentView之前否則不起作用
15         requestWindowFeature(Window.FEATURE_PROGRESS);// 進度指示器功能
16         requestWindowFeature(Window.FEATURE_INDETERMINATE_PROGRESS); // 不確定的進度
17         setContentView(R.layout.activity_main);
18         Button btn1 = (Button) findViewById(R.id.btn1);
19         Button btn2 = (Button) findViewById(R.id.btn2);
20         // 展示標題欄進度條
21         btn1.setOnClickListener(new OnClickListener() {
22             @Override
23             public void onClick(View v) {
24                 setProgressBarVisibility(true);
25                 setProgressBarIndeterminateVisibility(true);
26             }
27         });
28         // 隱藏標題欄進度條
29         btn2.setOnClickListener(new OnClickListener() {
30             @Override
31             public void onClick(View v) {
32                 setProgressBarVisibility(false);
33                 setProgressBarIndeterminateVisibility(false);
34             }
35         });
36     }
37 }