Android自定义属性：attr.xml 与 TypedArray

1.attr.xml

<?xml version="1.0" encoding="utf-8"?>
<resources>
    <declare-styleable name="MyView">
        <attr name="textColor" format="color" />
        <attr name="textSize" format="dimension" />
    </declare-styleable>
</resources>

2.在构造方法中使用

public MyView(Context context,AttributeSet attrs){
        super(context,attrs);
        mPaint = new Paint();

        TypedArray a = context.obtainStyledAttributes(attrs, R.styleable.MyView);

        int textColor = a.getColor(R.styleable.MyView_textColor, 0XFFFFFFFF);     //怎么获取：名字_ 属性 连接起来就可以
        float textSize = a.getDimension(R.styleable.MyView_textSize, 36);

        mPaint.setTextSize(textSize);
        mPaint.setColor(textColor);

        a.recycle();
    }

3.在布局文件中使用

<?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.android.tutor"                 //自定义属性前缀 与 包名
    android:orientation="vertical"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent" >

<com.android.tutor.MyView
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    test:textSize="20px"
    test:textColor="#fff"/>
</LinearLayout>