该工程的功能是实现进度条的显示，按以下按钮进度条增加10%

 

以下代码是MainActivity.java中的代码

package com.example.progressbar;import android.app.Activity;import android.os.Bundle;import android.view.Menu;import android.view.MenuItem;import android.view.View;import android.view.View.OnClickListener;import android.widget.Button;import android.widget.ProgressBar;public class MainActivity extends Activity {        //申明限量    private ProgressBar firstBar = null;    private ProgressBar secondBar = null;    private Button myButton = null;    private int i = 0;        @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        //根据控件的ID来取得代表控件的对象        firstBar = (ProgressBar)findViewById(R.id.firstBar);        secondBar = (ProgressBar)findViewById(R.id.secondBar);        myButton = (Button)findViewById(R.id.myButton);        myButton.setOnClickListener(new ButtonListener());        System.out.print(firstBar.getMax());    }        class ButtonListener implements OnClickListener{        @Override        public void onClick(View v) {            // TODO Auto-generated method stub            if(i == 0)            {                    //设置进度条处于可见的状态                firstBar.setVisibility(View.VISIBLE);                secondBar.setVisibility(View.VISIBLE);            }            else if(i < firstBar.getMax())            {                    //设置主进度条的当前值                firstBar.setProgress(i);                //设置第二进度条的当前值                firstBar.setSecondaryProgress(i + 10);                //因为默认的进度条无法显示进行的状态                //secondBar.setProgress(i);            }            else            {                    //设置进度条处于不可见状态                firstBar.setVisibility(View.GONE);                secondBar.setVisibility(View.GONE);            }            i = i + 10;        }    }}

 

以下代码是activity_main.xml中的代码