Android Create custom properties

First, in res/valuesThe file defines a Attrs.xmlFile. The code is as follows:<?xml version= "1.0" encoding= "Utf-8"?>
<resources>
<declare-styleable name= "CustomView" >
<attr name= "Android:textcolor"/>//use Android-brought property names in custom properties
<attr name= "Customtextsize" format= "Dimension"/>//custom property, the Format property represents the unit of the property
</declare-styleable>

</resources>

Second, we modify the Customview.java code as follows, where the following construction method is the focus, we get the defined properties r.sytleable.customview_android_ TextColor and r.sytleable.customview_customtextsize, gets the default values that are typically set later in the method (float textSize = a.getdimension ( R.styleable. customview_customtextsize , +); )to prevent us from being defined in the XML file. Thus using the default value!

Get,CustomView is the name defined in <declare-styleable name= "CustomView" ></declare-styleable> , get the Inside property with the name _ property to connect together. TypedArray usually last called the . Recycle () method, in order to keep the attribute consistent after use!

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.graphics.Rect;
Import Android.util.AttributeSet;
Import Android.view.View;

public class CustomView extends view{
Private Paint Mpaint;
private static final String mstring = "Welcome to Mr Wei ' s blog";
Public CustomView (Context context) {
Super (context);
Mpaint = new Paint ();
TODO auto-generated Constructor stub
}
Public CustomView (context context, AttributeSet Attrs) {
Super (context, attrs);
Mpaint = new Paint ();
TypedArray a = Context.obtainstyledattributes (Attrs, R.styleable.customview);

int textcolor = A.getcolor (R.styleable.customview_android_textcolor, 0xff0000);
float textSize = a.getdimension (r.styleable.customview_customtextsize, 36);

Mpaint.setcolor (TextColor);
Mpaint.settextsize (textSize);

A.recycle ();
}
@Override
protected void OnDraw (canvas canvas) {
TODO auto-generated Method Stub
Super.ondraw (canvas);
Set the Fill
Mpaint.setstyle (Style.fill);

Draw a rectangle, the first two are the coordinates of the upper left corner of the rectangle, the next two are the lower right corner coordinates
Canvas.drawrect (New Rect (Ten, Ten, Max), mpaint);

Mpaint.setcolor (Color.Blue);
Draw text
Canvas.drawtext (Mstring, ten, mpaint);
}
}

Third, add our custom CustomView to the layout main.xml file, flat and use custom attributes, custom attributes must be added:

xmlns:test = "http://schemas.android.com/apk/res/com.lee0000.AutoCustomAttr " Blue is the prefix of the custom attribute, red It's our package name. Main.xml All codes are as follows:

<?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/com.lee0000.AutoCustomAttr"
Android:layout_width= "Fill_parent"
android:layout_height= "Fill_parent"
android:orientation= "Vertical" >

<textview
Android:layout_width= "Fill_parent"
android:layout_height= "Wrap_content"
android:text= "@string/hello"/>

<com.lee0000.autocustomattr.customview
Android:layout_width= "Wrap_content"
android:layout_height= "Wrap_content"
Test:customtextsize= "20DP"//Custom properties
Android:textcolor= "#fff" >
</com.lee0000.AutoCustomAttr.customView>
</LinearLayout>

Previous Demo Download: Customattrexample.zip

Android Create custom properties