Android实战教程第二篇之简单实现两种进度条效果

本文实例实现点击按钮模拟进度条下载进度，“下载”完成进度条消失，供大家参考，具体内容如下

代码如下：
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="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>

Activity：

package ydl.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);//手动设置最大值，默认是100
    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 ;
  } 

 } 

}

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持我们。