android自訂控制項(三) 自訂屬性

書接上回 

在xml裡建立屬性,然後java代碼裡用typedArray獲得這些屬性,得到屬性後,利用屬性做一些事.例:得到xml裡的color,賦給paint.

1.在res/values/下建立attrs.xml

<?xml version="1.0" encoding="utf-8"?><resources>    <declare-styleable name="CustomView2">    <attr name="textColor" format="color" />    <attr name="textSize" format="dimension" />    </declare-styleable></resources><!-- name="CustomView1"控制項名稱 得到TypedArray時用 --><!-- name="textColor" 對應test:textColor --><!-- format="color" 對應構造方法裡a.getColor(R.styleable.CustomView2_textColor, 0xFFFFFFFF); -->

format詳解可參照http://blog.csdn.net/ethan_xue/article/details/7315064
2.主要看建構函式

public class CustomView2 extends View {private Paint mPaint2;private String mText = "drawText";public CustomView2(Context context, AttributeSet attrs) {super(context, attrs);mPaint2 = new Paint();// TypedArray是存放資源的array,1.通過上下文得到這個數組,attrs是建構函式傳進來的,對應attrs.xmlTypedArray a = context.obtainStyledAttributes(attrs, R.styleable.CustomView2);// 獲得xml裡定義的屬性,格式為 名稱_屬性名稱 後面是預設值int textColor = a.getColor(R.styleable.CustomView2_textColor, 0xFFFFFFFF);float textSize = a.getDimension(R.styleable.CustomView2_textSize, 35);mPaint2.setColor(textColor);mPaint2.setTextSize(textSize);// 為了保持以後使用該屬性一致性,返回一個綁定資源結束的訊號給資源a.recycle();}@Overrideprotected void onDraw(Canvas canvas) {super.onDraw(canvas);mPaint2.setStyle(Style.FILL);canvas.drawText(mText, 10, 60, mPaint2);}}

3.布局

<?xml version="1.0" encoding="utf-8"?><!-- xmlns:test="http://schemas.android.com/apk/res/ethan.customview1" 包名 --><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"xmlns:test="http://schemas.android.com/apk/res/ethan.customview1"     android:orientation="vertical"    android:layout_width="fill_parent"    android:layout_height="fill_parent"    ><ethan.customview1.CustomView2      android:layout_width="wrap_content"     android:layout_height="wrap_content"     test:textColor="#f00"    test:textSize="20sp"    /></LinearLayout>

4.

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