Use of typedarray Custom Attributes

Connection: http://w11h22j33.iteye.com/blog/890410

Today, the source code of alertdialog has theme. I want to modify the background and topic of alertdialog. I can see a post about how to modify the background of alertdialog, many classes do not know. typedarray is one of them.

So I found some information on the Internet.

We usually define control attributes in XML files, such as Android: Text Android: size, which can be customized.

The answer is yes. Android is still user-friendly, and can customize attributes, implementation styles, themes, and so on.

First, create an attrs. xml file under the values file:

<? XML version = "1.0" encoding = "UTF-8"?>
<Resources>

<Declare-styleable name = "myview">
<ATTR name = "textcolor" format = "color"/>
<ATTR name = "textsize" format = "dimension"/>
</Declare-styleable>
</Resources>

<Declare-styleable> It is a custom tag.

I can't do anything else.

Then use custom properties to set the view

Package cn.edu. WTU;

Import Android. content. context;
Import Android. content. res. typedarray;
Import Android. Graphics. Canvas;
Import Android. Graphics. color;
Import Android. Graphics. paint;
Import Android. Graphics. Paint. style;
Import Android. util. attributeset;
Import Android. View. view;

Public class myview extends view {

Private paint mpaint;
Private context mcontext;
Private Static final string mstr = "Welcome to typed-array ";
 
Public myview (context ){
Super (context );
Mpaint = new paint ();
}
Public myview (context, attributeset attrs ){
Super (context, attrs );
// Todo auto-generated constructor stub
Mpaint = new paint ();
Typedarray A = context. obtainstyledattributes (attrs, R. styleable. myview );
// Obtain the property. 0 xffffffff 16 is the default value.
Int textcolor = A. getcolor (R. styleable. myview_textcolor, 0 xffffffff );
Float textsize = A. getdimension (R. styleable. myview_textsize, 16 );
Mpaint. settextsize (textsize );
Mpaint. setcolor (textcolor );
// Recycling, for future use
A. Recycle ();
}
 
Protected void ondraw (canvas ){
Super. ondraw (canvas );
Mpaint. setstyle (style. Fill );
Canvas. drawrect (10, 10,100,100, mpaint );
Mpaint. setcolor (color. Blue );
Canvas. drawtext (mstr, 10,110, mpaint );
}
}
 

Note the names of R. styleable. myview, R. styleable. myview_textcolor.

Use the myview control in the main. xml file.

<? XML version = "1.0" encoding = "UTF-8"?>
<Linearlayout xmlns: Android = "http://schemas.android.com/apk/res/android"
Xmlns: test = "http://schemas.android.com/apk/res/cn.edu.wtu"
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"
/>
<Cn.edu. WTU. myview Android: layout_width = "fill_parent"
Android: layout_height = "fill_parent"
Test: textsize = "20sp"
Test: textcolor = "# ffffffff"
/>

</Linearlayout>
PS: xmlns: test = "http://schemas.android.com/apk/res/cn.edu.wtu"
Cn.edu. WTU is my package name and the domain name of my school

Test is the name. Test: textcolor = "# ffffffff"
 

Package cn.edu. WTU;

Import Android. App. activity;
Import Android. App. Dialog;
Import Android. OS. Bundle;

Public class alert extends activity {
/** Called when the activity is first created .*/
@ Override
Public void oncreate (bundle savedinstancestate ){
Super. oncreate (savedinstancestate );
Setcontentview (R. layout. Main );
}

}