Examples of using custom composite controls in Android development _android

One, define an XML layout file
setting_item_view.xml

<?xml version= "1.0" encoding= "Utf-8"?> <relativelayout xmlns:android= "http://schemas.android.com/apk/res/" Android "Android:layout_width=" Fill_parent "android:layout_height=" 60dip "> <textview android:id=" @+id/tv _title "android:layout_width=" wrap_content "android:layout_height=" Wrap_content "Android:layout_alignparentlef" T= "true" android:layout_marginleft= "5dip" android:layout_margintop= "5dip" android:textcolor= "#000000" an Droid:textsize= "20dip"/> <textview android:id= "@+id/tv_desc" android:layout_width= "Wrap_content" and roid:layout_height= "Wrap_content" android:layout_below= "@+id/tv_title" android:layout_marginleft= "5dip" Androi
    D:layout_marginbottom= "5dip" android:textcolor= "#99000000" android:textsize= "18dip"/> <checkbox Android:clickable= "false" android:focusable= "false" android:id= "@+id/cb_status" android:layout_width= "Wrap_con" Tent "Android:layout_height= "Wrap_content" android:layout_alignparentright= "true" android:layout_centervertical= "true" Android:layout_mar ginright= "20dip"/> <view android:layout_width= "fill_parent" android:layout_height= "0.2dip" android:l Ayout_alignparentbottom= "true" android:layout_alignparentleft= "true" android:layout_marginleft= "5dip" Android:

 layout_marginright= "5dip" android:background= "#000000"/> </RelativeLayout>

Defining attributes in Src/values/attrs.xml

<?xml version= "1.0" encoding= "Utf-8"?>

<resources>
  <declare-styleable name= "TextView" >
    <attr name= "title" format= "string"/>
    <attr name= "desc_on" format= "string"/>
    <attr "Desc_off" format= "string"/>
  </declare-styleable>


</resources>

Third, customize a view to inherit from the layout you need
Iniview (Context context) Initializes a custom layout file

Customize some API methods based on requirements

public class Settingitemview extends Relativelayout {private CheckBox cb_status;
  Private TextView Tv_title;

  Private TextView Tv_desc;
  Private String title;
  Private String desc_on;



  Private String Desc_off;
    public void Iniview {view.inflate (context, R.layout.setting_item_view, this);
    Cb_status = (CheckBox) Findviewbyid (r.id.cb_status);
    Tv_title = (TextView) Findviewbyid (r.id.tv_title);
  Tv_desc = (TextView) Findviewbyid (R.ID.TV_DESC);
    Public Settingitemview (context, AttributeSet attrs, int defstyle) {Super (context, attrs, Defstyle);
  Iniview (context);
    Public Settingitemview (context, AttributeSet attrs) {Super (context, attrs);
    Iniview (context);
    title = Attrs.getattributevalue ("Http://schemas.android.com/apk/res/com.victor.mobilesafe", "title");
    desc_on = Attrs.getattributevalue ("Http://schemas.android.com/apk/res/com.victor.mobilesafe", "desc_on"); Desc_off = Attrs.getattributevalue ("Http://schemas.android.com/apk/res/com.victor.mobilesafe "," Desc_off ");
    Tv_title.settext (title);
  Setdesc (Desc_off);
    Public Settingitemview {Super (context);
  Iniview (context);

  public Boolean ischecked () {return cb_status.ischecked ();
    public void setchecked (Boolean checked) {if (checked) {Setdesc (desc_on);
    }else{Setdesc (Desc_off);

  } cb_status.setchecked (checked);
  public void Setdesc (String text) {tv_desc.settext (text);

 }

}

Use the custom combination control in a layout file
don't forget to declare a custom namespace
Xmlns:victor= "Http://schemas.android.com/apk/res/com.victor.mobilesafe"

<?xml version= "1.0" encoding= "Utf-8"?> <linearlayout xmlns:android=
"http://schemas.android.com/apk/" Res/android "
  xmlns:victor=" Http://schemas.android.com/apk/res/com.victor.mobilesafe "
  android:layout_ Width= "Match_parent"
  android:layout_height= "match_parent"
  android:orientation= "vertical" >
 < Com.victor.mobilesafe.ui.SettingItemView
    android:id= "@+id/siv_update"
    android:layout_width= "Wrap_ Content "
    android:layout_height=" wrap_content "
    victor:desc_off= Automatic Update shutdown"
    victor:desc_on= "Automatic Update Open"
    victor:title= "Set Automatic Updates" >
  </com.victor.mobilesafe.ui.SettingItemView>
</linearlayout >

Summarize:

1. Customize a view generally speaking, inherit relative layout, or linear layout viewgroup;

2. Implement the method of constructing the parent class. In general, a custom layout file needs to be initialized in the constructor method;

3. Define some API methods according to some needs or requirements;

4. Customize the properties of the control, as needed, to refer to the TextView property;

5. Custom namespaces, for example:

Xmlns:victor= "http://schemas.android.com/apk/res/< Package name >"

xmlns:victor= "http://schemas.android.com/apk/ Res/com.victor.mobilesafe "

6. Customizing our attributes in the Res/values/attrs.xml

7. Use our custom attributes

For example:

 itheima:title= "Set Automatic Update itheima:desc_on=" Set Automatic Update

 is turned on "

 itheima:desc_off=" Set Automatic Update has been turned off "

8. In our custom control's constructor with two parameters AttributeSet Attrs takes out our property values and associates the controls corresponding to the custom layout file.