Android custom Controls (iii) custom properties

The book is connected to the

Create attributes in XML, and then use Typedarray to get the attributes in Java code, and then use attributes to do something. Example: Get the color in XML and assign it to paint.

1. Create a new attrs.xml under res/values/

[HTML]View Plaincopy

2. <? XML version= "1.0" encoding="Utf-8"?>
4. <resources>
6. <declare-styleable name="CustomView2">
8. <attr name="TextColor" format="color" />
10. <attr name="textSize" format="Dimension" />
12. </declare-styleable>
14. </Resources>
16. <!--name= "CustomView1" Control name gets Typedarray
18. <!--name= "TextColor" corresponds to Test:textcolor--
20. <!--format= "color" corresponding to the construction method A.getcolor (R.styleable.customview2_textcolor, 0xFFFFFFFF); -

Format details can be referenced http://blog.csdn.net/ethan_xue/article/details/7315064
2. The main view of the constructor function

[Java]View Plaincopy

2. Public class CustomView2 extends View {
6. private Paint MPaint2;
8. private String MText = "DrawText";
12. Public CustomView2 (context context, AttributeSet attrs) {
14. Super (context, attrs);
16. MPaint2 = new Paint ();
18. //Typedarray is the array,1 that holds the resource. This array is obtained through the context, Attrs is the constructor that is passed in, corresponding to Attrs.xml
20. TypedArray a = Context.obtainstyledattributes (Attrs, R.STYLEABLE.CUSTOMVIEW2);
22. //Get attributes defined in XML, formatted as name _ property name followed by default value
24. int textcolor = A.getcolor (R.styleable.customview2_textcolor, 0xFFFFFFFF);
26. float textSize = a.getdimension (r.styleable.customview2_textsize, 35);
28. Mpaint2.setcolor (TextColor);
30. Mpaint2.settextsize (textSize);
32. //In order to maintain consistency with this attribute later, return a binding resource to the end of the signal to the resource
34. A.recycle ();
36. }
40. @Override
42. protected void OnDraw (canvas canvas) {
44. Super.ondraw (canvas);
48. Mpaint2.setstyle (Style.fill);
50. Canvas.drawtext (MText, Ten, mPaint2);
52. }
56. }

3. Layout

[HTML]View Plaincopy

2. <? XML version= "1.0" encoding="Utf-8"?>
4. <!--xmlns:test= "Http://schemas.android.com/apk/res/ethan.customview1" package name--
6. <linearlayout xmlns:android="http://schemas.android.com/apk/res/android"
8. xmlns:test="Http://schemas.android.com/apk/res/ethan.customview1"
10. android:orientation="vertical"
12. android:layout_width="fill_parent"
14. android:layout_height="fill_parent"
16. >
18. <ethan.customview1.CustomView2
20. android:layout_width="wrap_content"
22. android:layout_height="wrap_content"
24. test:textcolor="#f00"
26. test:textsize="20sp"
28. />
30. </linearlayout>

4.

http://download.csdn.net/detail/ethan_xue/4108832

Android custom Controls (iii) custom properties