Three ways to get properties in Android custom Controls (GO)

The first method, directly set the property value, through Attrs.getattributeresourcevalue to get this property value.

(1) Setting property values in an XML file

< Com.example.activity.IconTextView           Android:layout_width = "Fill_parent"       android:layout_height= "Wrap_content"      android:text= "@string/smile1"        iconsrc= "@drawable/smile"/>  

(2) Get this value in the constructor

Public Icontextview (context context, AttributeSet Attrs) {          Super (context, attrs);          ResourceID = Attrs. Getattributeresourcevalue (NULL, "ICONSRC", 0);          if (ResourceID > 0) {              bitmap = Bitmapfactory.decoderesource (Getresources (), ResourceID);          }      }  

The second method, use your own namespace

(1) Note in the XML file, you need to declare a namespace in the form of HTTP//+ the package name of the view

<LinearLayoutxmlns:android= "Http://schemas.android.com/apk/res/android"Xmlns:mobile= "Http://com.example.activity"Android:layout_width= "Fill_parent"Android:layout_height= "Fill_parent"android:orientation= "vertical" >        <Com.example.activity.IconTextViewAndroid:layout_width= "Fill_parent"Android:layout_height= "Wrap_content"Android:text= "@string/smile1"mobile:iconsrc= "@drawable/smile"/>    </LinearLayout>  

(2) through Attrs.getattributeresourcevalue, where the first parameter is a namespace.

1. Name space

Private Final String namespace = "Http://com.example.activity"

 Public Icontextview (Context context, AttributeSet attrs) {          Super(context, attrs);           = Attrs.getattributeresourcevalue (namespace, "Iconsrc", 0);   //       TypedArray array = context.obtainstyledattributes (Attrs, R.styleable.icontextview);   //       ResourceID = Array.getresourceid (r.styleable.icontextview_iconsrc, 0);          if (ResourceID > 0) {              = Bitmapfactory.decoderesource (getresources (), ResourceID);          }      }  

The third Way, by customizing the Attrs.xml, is to implement

(1) Customizing a attrs.xml file

<?XML version= "1.0" encoding= "Utf-8"?>  <Resources>      <declare-styleablename= "Icontextview">          <attrname= "Iconsrc"format= "Reference"/>      </declare-styleable>  </Resources>  

(2) Use this attribute in an XML file, noting the writing specification of the namespace at this time.

<?XML version= "1.0" encoding= "Utf-8"?>  <LinearLayoutxmlns:android= "Http://schemas.android.com/apk/res/android"Xmlns:mobile= "Http://schemas.android.com/apk/res/com.example.activity"Android:layout_width= "Fill_parent"Android:layout_height= "Fill_parent"android:orientation= "vertical" >        <Com.example.activity.IconTextViewAndroid:layout_width= "Fill_parent"Android:layout_height= "Wrap_content"Android:text= "@string/smile1"mobile:iconsrc= "@drawable/smile"/>            <Com.example.activity.IconTextViewAndroid:layout_width= "Fill_parent"Android:layout_height= "Wrap_content"Android:text= "@string/smile2"android:textsize= "24DP"mobile:iconsrc= "@drawable/smile"/>            <Com.example.activity.IconTextViewAndroid:layout_width= "Fill_parent"Android:layout_height= "Wrap_content"Android:text= "@string/smile3"android:textsize= "36DP"mobile:iconsrc= "@drawable/smile"/>          </LinearLayout>  

(3) Use Context.obtainstyledattributes in code to get property values

Package com.example.activity;  Import Android.content.Context;  Import Android.content.res.TypedArray;  Import Android.graphics.Bitmap;  Import Android.graphics.BitmapFactory;  Import Android.graphics.Canvas;  Import Android.graphics.Rect;  Import Android.util.AttributeSet;    Import Android.widget.TextView; public class Icontextview extends TextView {//namespace private final String namespace = "Http://com.example.activit      Y ";      Resource ID private int resourceID = 0;        Private Bitmap Bitmap;          Public Icontextview (context context, AttributeSet Attrs) {Super (context, attrs);          TypedArray array = context.obtainstyledattributes (Attrs, R.styleable.icontextview);          ResourceID = Array.getresourceid (r.styleable.icontextview_iconsrc, 0);          if (ResourceID > 0) {bitmap = Bitmapfactory.decoderesource (Getresources (), ResourceID); }} @Override public void OnDraw (canvas canvas) {if (Bitmap! = Null) {rect src = new Rect (0, 0, bitmap.getwidth (), Bitmap.getheight ());              Rect target = new rect ();              int textHeight = (int) gettextsize ();              Target.left = 0;              Target.top = (int) (Getmeasuredheight ()-gettextsize ())/2 + 1;              Target.bottom = Target.top + textHeight;                            Target.right = (int) (TextHeight * (Bitmap.getwidth ()/(float) bitmap.getheight ()));                            Canvas.drawbitmap (bitmap, SRC, target, getpaint ());          Canvas.translate (target.right + 2, 0);      } super.ondraw (canvas);   }        }

Three ways to get properties in Android custom Controls (GO)