进度条ProgressBar应用

layout的配置文件：

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:orientation="vertical"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent" >

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="@string/hello_world"
        tools:context=".Activity02" />
	<ProgressBar 
	    android:id="@+id/pro1"
	    android:layout_width="fill_parent"
	    android:layout_height="wrap_content"
	    android:visibility="gone"
	    style="?android:attr/progressBarStyleHorizontal"
	    />
    <ProgressBar 
        android:id="@+id/pro2"
	    android:layout_width="fill_parent"
	    android:layout_height="wrap_content"
	    android:visibility="gone"
	    style="?android:attr/progressBarStyleInverse"
        />
    
    <Button 
        android:id="@+id/button"
        android:layout_width="wrap_content"
	    android:layout_height="wrap_content"
	    android:layout_margin="10pt"
        />
</LinearLayout>

 

代码：

package com.example.progressbar;

import android.opengl.Visibility;
import android.os.Bundle;
import android.app.Activity;
import android.view.Menu;
import android.view.View;
import android.widget.Button;
import android.widget.ProgressBar;

public class Activity02 extends Activity {
	
	ProgressBar pro1;
	ProgressBar pro2;
	Button button;
	private int i = 0;
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_activity02);
        
        pro1 = (ProgressBar) findViewById(R.id.pro1);
        pro2 = (ProgressBar) findViewById(R.id.pro2);
        button = (Button) findViewById(R.id.button);
        
        button.setText("确定");
        
        button.setOnClickListener(new View.OnClickListener() {
			
			@Override
			public void onClick(View arg0) {
				if(i==0){
					pro1.setVisibility(View.VISIBLE);
					pro2.setVisibility(View.VISIBLE);
				}
				else if (i<100){
					pro1.setProgress(i);
					pro1.setSecondaryProgress(i+10);
					pro2.setProgress(i);
					pro2.setSecondaryProgress(i+10);
				}else{
					pro1.setVisibility(View.GONE);
					pro2.setVisibility(View.GONE);
				}
				i=i+10;
			}
		});
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        getMenuInflater().inflate(R.menu.activity_activity02, menu);
        return true;
    }
}