在標題欄顯示進度圖標 - Window.FEATURE_INDETERMINATE_PROGRESS

要在標題欄顯示進度圖標, 先要要求窗口功能"Window.FEATURE_INDETERMINATE_PROGRESS":
requestWindowFeature(Window.FEATURE_INDETERMINATE_PROGRESS);

再調用 setProgressBarIndeterminateVisibility(true/false) 方法來顯示/隱藏它.

實例:

package com.AndroidProgressTitleBar;

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

public class AndroidProgressTitleBarActivity 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 btnTurnOnProgress = (Button)findViewById(R.id.progresson);
        Button btnTurnOffProgress = (Button)findViewById(R.id.progressoff);
        
        btnTurnOnProgress.setOnClickListener(new Button.OnClickListener(){

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

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