顯示標題進度條, setProgressBarIndeterminateVisibility()

要在標題欄顯示進度條, 首先在 setContentView() 前調用 requestWindowFeature(Window.FEATURE_INDETERMINATE_PROGRESS) 函數要求FEATURE_INDETERMINATE_PROGRESS 功能. 再通過調用 setProgressBarIndeterminateVisibility(true/false) 函數顯示/隱藏標題進度條.

package com.AndroidProgressTitle;

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

public class AndroidProgressTitleActivity extends Activity {
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        requestWindowFeature(Window.FEATURE_INDETERMINATE_PROGRESS);
        setContentView(R.layout.main);
        
        Button showProgress = (Button)findViewById(R.id.showprogress); 
        Button hideProgress = (Button)findViewById(R.id.hideprogress);
        
        showProgress.setOnClickListener(new Button.OnClickListener(){

   @Override
   public void onClick(View arg0) {
    // TODO Auto-generated method stub
    setProgressBarIndeterminateVisibility(true);
   }});
        
        hideProgress.setOnClickListener(new Button.OnClickListener(){

   @Override
   public void onClick(View arg0) {
    // TODO Auto-generated method stub
    setProgressBarIndeterminateVisibility(false);
   }});
    }
}

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    >
<TextView  
    android:layout_width="fill_parent" 
    android:layout_height="wrap_content" 
    android:text="@string/hello"
    />
<Button  
    android:id="@+id/showprogress"
    android:layout_width="fill_parent" 
    android:layout_height="wrap_content" 
    android:text="顯示標題進度條"
    />
<Button  
    android:id="@+id/hideprogress"
    android:layout_width="fill_parent" 
    android:layout_height="wrap_content" 
    android:text="隱藏標題進度條"
    />
</LinearLayout>