android 如何自定义view

１. 首先在 attrs.xml　中声明自定义view要自定义的属性：

    <declare-styleable name="CustomTextView">
<attr name="titleText" format="string"></attr>
<attr name="titleTextColor" format="color"></attr>

        <attr name="titleTextSize" format="dimension"></attr>

    </declare-styleable>

    
    注意：

(1) name 不是 android:name

    (2)　format一共有：string,　color,　dimension,　integer,　enum,　reference,　float,　boolean,　fraction,　flag, 
各个类型的含义可以参考这个文章：http://blog.csdn.net/ethan_xue/article/details/7315064

２.　在XML引用(引入命名空间，注意最后是包名)：

<?xml version="1.0" encoding="utf-8"?>

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"

    xmlns:custom="http://schemas.android.com/apk/res/com.zmq.test"

    android:layout_width="fill_parent"

    android:layout_height="match_parent"

    android:gravity="center"

    android:orientation="vertical" >

    <com.geak.test.CustomTextView

        android:layout_width="120dip"

        android:layout_height="120dip"

        android:background="#ffffff"

        custom:titleText="ABCDEFG"

        custom:titleTextColor="#00ff00"

        custom:titleTextSize="13sp">

    </com.geak.test.CustomTextView>

</LinearLayout>

３.　初始化构造函数差读取自定义属性值：

public class CustomTextView extends TextView {

    private String text;

    private int color;

    private int size;

    
public CustomTextView(Context context) {
this(context, null);
}

public CustomTextView(Context context, AttributeSet attrs) {//  此构造函数必走
this(context, attrs, 0);
}

public CustomTextView(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, 0);

TypedArray a = context.obtainStyledAttributes(attrs, R.styleable.CustomTextView, defStyle, 0);
text = a.getString(R.styleable.CustomTextView_titleText);
color = a.getColor(R.styleable.CustomTextView_titleTextColor, Color.BLACK);
size = a.getDimensionPixelSize(R.styleable.CustomTextView_titleTextSize, 13);
setText(text);
setTextColor(color);
setTextSize(size);
a.recycle();
}

}