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Android中自訂屬性基本步驟
這次只是說明最簡單的自訂屬性流程
1. 建立資源檔: resources/attr.xml
<?xml version="1.0" encoding="utf-8"?><resources> <declare-styleable name="test"> <attr name="test" format="string" /> <attr name="testArr" format="integer" /> </declare-styleable></resources>
2. 自訂view類
public class MyTextView extends View{ private static final String TAG = "MyTextView"; public MyTextView(Context context, AttributeSet attrs) { super(context, attrs); TypedArray ta = context.obtainStyledAttributes(attrs,R.styleable.test); String text = ta.getString(R.styleable.test_testArr); int textAttr = ta.getInteger(R.styleable.test_text, -1); Log.e(TAG, "text:"+text+",textAttr:"+textAttr); ta.recycle(); }}
3. 在布局檔案中使用
<?xml version="1.0" encoding="utf-8"?><RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" xmlns:yxm="http://schemas.android.com/apk/res-auto" android:layout_width="match_parent" android:layout_height="match_parent" tools:context="org.xm.customview.MainActivity"> <org.xm.customview.MyTextView android:layout_width="100dp" android:layout_height="200dp" yxm:testArr="20" yxm:text="xiaoming" /></RelativeLayout>
注意
androidstudio中使用:xmlns:yxm="http://schemas.android.com/apk/res-auto"自動匯入命名控制項
如果在eclipse中要使用完成的包名,如:xmlns:sdf="http://schemas.android.com/apk/res/org.xm.customview"
給自訂屬性添加參數使用制定定義的命名空間,例如: yxm:testArr="20"
4. 實現自訂View,擷取自訂屬性
public class MyTextView extends View{ private static final String TAG = "MyTextView"; public MyTextView(Context context, AttributeSet attrs) { super(context, attrs); TypedArray ta = context.obtainStyledAttributes(attrs,R.styleable.test); String text = ta.getString(R.styleable.test_text); int textAttr = ta.getInteger(R.styleable.test_testArr, -1); Log.e(TAG, "text:"+text+",textAttr:"+textAttr); ta.recycle(); }}
注意
R.styleable.test_text中 text_是自動添加的(必須寫),然後添加屬性名稱字text
所以最後會列印:text:xiaoming,textAttr:20, 還是很簡單的吧!
Android中自訂屬性基本步驟