进度条——显示在标题栏

xml文件：

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:orientation="horizontal"    android:layout_width="fill_parent"    android:layout_height="wrap_content"    ><Button android:id="@+id/button1"         android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:text=" 显示"/><Button android:id="@+id/button2"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:text="隐藏"/></LinearLayout>

java文件：

package com.imooc.progressbarr;import android.os.Bundle;import android.app.Activity;import android.view.Menu;import android.view.View;import android.view.View.OnClickListener;import android.view.Window;import android.widget.Button;public class MainActivity extends Activity {    private Button btn1;    private Button btn2;    @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 btn1=(Button)findViewById(R.id.button1);        Button btn2=(Button)findViewById(R.id.button2);        btn1.setOnClickListener(new OnClickListener(){            @Override            public void onClick(View v) {                // TODO Auto-generated method stub                //显示不带进度的进度条                setProgressBarIndeterminateVisibility(true);                //显示不带进度的进度条                setProgressBarVisibility(true);                //设置进度条的进度                setProgress(4500);            }         });        btn2.setOnClickListener(new OnClickListener(){            @Override            public void onClick(View v) {                // TODO Auto-generated method stub                //隐藏不带进度的进度条                setProgressBarIndeterminateVisibility(false);                //隐藏带进度的进度条                setProgressBarVisibility(false);            }          });    }    @Override    public boolean onCreateOptionsMenu(Menu menu) {        // Inflate the menu; this adds items to the action bar if it is present.        getMenuInflater().inflate(R.menu.main, menu);        return true;    }}