ANDROID_MARS学习笔记_S01原始版_005_ProgressBar

Posted 2020-06-13

一、代码

1.xml
(1)main.xml

 1 <?xml version="1.0" encoding="utf-8"?>
 2 <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
 3     android:orientation="vertical"
 4     android:layout_width="fill_parent"
 5     android:layout_height="fill_parent"
 6     >
 7 <TextView  
 8     android:layout_width="fill_parent" 
 9     android:layout_height="wrap_content" 
10     android:text="@string/hello"
11     />
12 <ProgressBar
13     android:id="@+id/firstBar"
14     style="?android:attr/progressBarStyleHorizontal"
15     android:layout_width="200dp"
16     android:layout_height="wrap_content"
17     android:visibility="gone"
18     />
19 <ProgressBar
20     android:id="@+id/secondBar"
21     style="?android:attr/progressBarStyle"
22     android:layout_width="wrap_content"
23     android:layout_height="wrap_content"
24     android:visibility="gone"
25     />
26 <Button
27     android:id="@+id/myButton"
28     android:layout_width="wrap_content"
29     android:layout_height="wrap_content"
30     android:text="begin"
31     />
32 </LinearLayout>

 

2.java
(1)ProgressBarTest.java

 1 package mars.progressbar;
 2 
 3 import android.app.Activity;
 4 import android.os.Bundle;
 5 import android.view.View;
 6 import android.view.View.OnClickListener;
 7 import android.widget.Button;
 8 import android.widget.ProgressBar;
 9 
10 public class ProgressBarTest extends Activity {
11     /** Called when the activity is first created. */
12     //声明变量
13     private ProgressBar firstBar =null;
14     private ProgressBar secondBar = null;
15     private Button myButton = null;
16     private int i = 0 ;
17     @Override
18     public void onCreate(Bundle savedInstanceState) {
19         super.onCreate(savedInstanceState);
20         setContentView(R.layout.main);
21         //根据控件的ID来取得代表控件的对象
22         firstBar = (ProgressBar)findViewById(R.id.firstBar);
23         secondBar = (ProgressBar)findViewById(R.id.secondBar);
24         myButton = (Button)findViewById(R.id.myButton);
25         myButton.setOnClickListener(new ButtonListener());
26     }
27     class ButtonListener implements OnClickListener{
28         
29         @Override
30         public void onClick(View v) {
31             if(i == 0)
32             {
33                 //设置进度条处于可见的状态
34                 firstBar.setVisibility(View.VISIBLE);
35                 firstBar.setMax(150);
36                 secondBar.setVisibility(View.VISIBLE);
37             }
38             else if ( i < firstBar.getMax()){
39                 //设置主进度条的当前值
40                 firstBar.setProgress(i);
41                 //设置第二进度条的当前值
42                 firstBar.setSecondaryProgress(i + 10);
43                 //因为默认的进度条无法显示进行的状态
44                 //secondBar.setProgress(i);
45                 
46             }
47             else{
48                 //设置进度条处于不可见状态
49                 firstBar.setVisibility(View.GONE);
50                 secondBar.setVisibility(View.GONE);
51             }
52             i = i + 10 ;
53         }
54         
55     }
56     
57 }