Android ProgressBar 进度条

截图如下：

package com.coolbi;

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

public class ProgressBarTest extends Activity {
    /** Called when the activity is first created. */
	
	private ProgressBar firstBar = null;
	
	private ProgressBar secondBar = null;
	
	private Button myButton = null;
	
	
	int i = 0 ;
	
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        
        firstBar = (ProgressBar)findViewById(R.id.firstBar);
        secondBar = (ProgressBar)this.findViewById(R.id.secondBar);
        
        myButton = (Button)this.findViewById(R.id.myButton);
        myButton.setText("ProgressBar Test");        
        myButton.setOnClickListener(new MyButtonClickListener());
        
    }
    
    class MyButtonClickListener implements OnClickListener
    {

		@Override
		public void onClick(View v)
		{
			if(i==0)
			{
				firstBar.setVisibility(View.VISIBLE);
				secondBar.setVisibility(View.VISIBLE);
				i += 10;
			}
			else if(i>0 && i<100)
			{
				firstBar.setProgress(i);
				firstBar.setSecondaryProgress(i+10);
				secondBar.setProgress(i);
				i += 10;
			}
			else
			{
				firstBar.setVisibility(View.GONE);
				secondBar.setVisibility(View.GONE);
				firstBar.setProgress(0);
				firstBar.setSecondaryProgress(0);
				secondBar.setProgress(0);
				i = 0;
			}
			
		}
    	
    }
}

 2.main.xml

<?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"
    />
    
<ProgressBar
	android:id="@+id/firstBar"
	style="?android:attr/progressBarStyleHorizontal"
	android:layout_width="fill_parent"
	android:layout_height="wrap_content"
	android:visibility="gone"
	/>
	
<ProgressBar
	android:id="@+id/secondBar"
	style="?/android:attr/progressBarStyle"
	android:layout_width="wrap_content"
	android:layout_height="wrap_content"
	android:visibility="gone"
	/>

<Button
	android:id="@+id/myButton"
	android:layout_width="wrap_content"
	android:layout_height="wrap_content"
	/>

</LinearLayout>