ANDROID_MARS学习笔记_S01原始版_005_ProgressBar

一、代码

1.xml
(1)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="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>

2.java
(1)ProgressBarTest.java

 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 ;
         }

     }

 }