<?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="200dp"

    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"

    android:text="begin"

    />

</LinearLayout>

package mars.progressbar;

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. */

    //声明变量

    private ProgressBar firstBar =null;

    private ProgressBar secondBar = null;

    private Button myButton = null;

    private int i = 0 ;

    @Override

    public void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.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());

    }

    class ButtonListener implements OnClickListener{

        @Override

        public void onClick(View v) {

            if(i == 0)

            {

                //设置进度条处于可见的状态

                firstBar.setVisibility(View.VISIBLE);

                firstBar.setMax(150);

                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 ;

        }

    }

}