Android Study Notes (4) CheckBox, RadioGroup, and ProgressBar

1. Select multiple buttons-CheckBox
Usage: first, the Control ID is used to obtain the object representing the control, and then the listener is added to it.
Set the listener code:
Product_box. setOnCheckedChangeListener (new CompoundButton. onCheckedChangeListener () {@ Override public void onCheckedChanged (CompoundButton buttonView, boolean isChecked) {// TODO Auto-generated method stub if (isChecked) {System. out. println ("swim is checked");} else {System. out. println ("swim is unchecked ");}}}); <divre mce_tmp = "1"> <pre> </pre> <p> <font class = "" style = "FONT-FAMILY:" color = "# ff7e0 0 "> <p> the consumer box is a subclass of CompoundButton, so it can be converted to the CompoundButton type and the parameter is passed in. </P> </font> </p> </divre>
 
 
 
 
Ii. Single-choice button-RadioGroup
Usage: Same as CheckBox
Set the listener code:
GenderGroup. setOnCheckedChangeListener (new RadioGroup. onCheckedChangeListener () {@ Override public void onCheckedChanged (RadioGroup group, int checkedId) {// TODO Auto-generated method stub if (femaleButton. getId () = checkedId) {System. out. println ("famale"); Toast. makeText (RadioTest. this, "famle", Toast. LENGTH_SHORT ). show ();} else if (maleButton. getId () = checkedId) {System. out. println ("male") ;}}); <divre mce_tmp = "1"> <pre> </divre>
 
 
 
 
 
 
 
3. Progress bar-ProgressBar
The. xml file is defined as follows: horizontal progress bar
<ProgressBar android: id = "@ + id/firstBar" style = "? Android: attr/progressBarStyleHorizontal "android: layout_width =" 200dp "android: layout_height =" wrap_content "android: visibility =" gone "// whether the status is visible, gone is not visible/> <divre mce_tmp = "1"> <pre> </pre> <p> <font class = "" style = "FONT-FAMILY: "color =" #464646 "> <p> the maximum progress bar value is 100 by default. In the preceding example, to customize the progress bar, use android: max =" xxx, you can also set it in the code. Example! </P> </font> </p> </divre>
 
 
 
 
Let's look at another widget.
<ProgressBar android: id = "@ + id/secondBar" style = "? Android: attr/progressBarStyle "// here, progressBarStyle is the default style, that is, the circle droid: layout_width =" wrap_content "android: layout_height =" wrap_content "android: visibility = "gone"/> <divre mce_tmp = "1"> <pre> </pre> <p> </divre>
 
Progress bar in Activity:

Class ButtonListener implements OnClickListener {@ Override public void onClick (View v) {if (I = 0) {// set the progress bar to firstBar in the visible state. setVisibility (View. VISIBLE); firstBar. setMax (150); // set the maximum value of the progress bar in the Code secondBar. setVisibility (View. VISIBLE);} else if (I <firstBar. getMax () {// set the current value of the main progress bar firstBar. setProgress (I); // set the current value of the Second progress bar firstBar. setSecondaryProgress (I + 10); // The progress bar cannot be displayed due to the default progress bar. // secondBar. setProgress (I);} else {// set the progress bar to the invisible firstBar. setVisibility (View. GONE); secondBar. setVisibility (View. GONE) ;} I = I + 10 ;}}
<Divre mce_tmp = "1"> </divre>
 
 
Iv. List-ListView
 
The List implements ListActivity instead of Activity.
Activity Code:
 
Java code
Public class Activity01 extends ListActivity {
/** Inherit from the ListActivity class */
@ Override
Public void onCreate (Bundle savedInstanceState ){
Super. onCreate (savedInstanceState );
SetContentView (R. layout. main );
ArrayList <HashMap <String, String> list = new ArrayList <HashMap <String, String> ();
HashMap <String, String> map1 = new HashMap <String, String> ();
HashMap <String, String> map2 = new HashMap <String, String> ();
HashMap <String, String> map3 = new HashMap <String, String> ();
Map1.put ("user_name", "zhangsan ");
Map1.put ("user_ip", "192.168.0.1 ");
Map2.put ("user_name", "zhangsan ");
Map2.put ("user_ip", "192.168.0.2 ");
Map3.put ("user_name", "wangwu ");
Map3.put ("user_ip", "192.168.0.3 ");
List. add (map1 );
List. add (map2 );
List. add (map3 );
MyAdapter listAdapter = new MyAdapter (this,
List, R. layout. user, new String [] {"user_name", "user_ip "},
New int [] {R. id. user_name, R. id. user_ip });
/** This is the object of the current ListActivity,
* List keyword. Place the cursor over the list and you can see the ArrayList <HashMap <String, String> list
* Indicates: first, it is an ArrayList with HashMap and two String objects in HashMap.
* R. id. uder_name is the layout file, followed by an array, and the last long string is the control layout displayed in the list.
* User_name and user_ip correspond to columns in HashMap, and the last new int [] corresponds to the values in the column */
SetListAdapter (listAdapter );
}
}

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"> <LinearLayout android: id = "@ + id/listLinearLayout" android: layout_width = "fill_parent" android: layout_height = "wrap_content" android: orientation = "vertical"> <ListView android: id = "@ id/android: list" android: layout_width = "fill_parent" android: layout_height = "wrap_content" android: drawselectid Top = "true" android: scrollbars = "vertical"/> </LinearLayout>
 
 
Uesr. xml:
<? Xml version = "1.0" encoding = "UTF-8"?> <LinearLayout xmlns: android = "http://schemas.android.com/apk/res/android" android: layout_width = "fill_parent" android: layout_height = "fill_parent" android: orientation = "horizontal" android: paddingLeft = "10dip" android: paddingRight = "10dip" android: paddingTop = "1dip" android: paddingBottom = "1dip"> <TextView android: id = "@ + id/user_name" android: layout_width = "180dip" android: layout_height = "30dip" android: textSize = "5pt" android: singleLine = "true"/> <TextView android: id = "@ + id/user_ip" android: layout_width = "fill_parent" android: layout_height = "fill_parent" android: gravity = "right" android: textSize = "5pt"/> </LinearLayout>