¿Por qué no puedo obtener valores fromdeclare Styleed TypedArray a través de obtenerStyledAttributes?

He creado un control personalizado, y definir algunos atributos en attri.xml, pero no puedo obtener valores fromdeclare estilo TypedArray a través de obtenerStyledAttributes, ¿podría ayudarme a comprobar lo que está mal sobre mis códigos?

/res/values/attrs.xml

<?xml version="1.0" encoding="utf-8"?> <resources> <declare-styleable name="TopBar"> <attr name="title2" format="string" /> <attr name="titleTextSize2" format="dimension" /> <attr name="titleTextColor2" format="color" /> <attr name="leftTextColor" format="color" /> <attr name="leftBackground" format="color|reference" /> <attr name="leftText" format="string" /> <attr name="rightTextColor" format="color" /> <attr name="rightBackground" format="color|reference" /> <attr name="rightText" format="string" /> </declare-styleable> </resources> 

/res/layout/activity_main.xml

 <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:myapp="http://schemas.android.com/apk/res-auto" android:layout_width="match_parent" android:layout_height="match_parent" android:orientation="vertical"> <com.qihoo.foo.TopBar android:id="@+id/topbar" android:layout_width="match_parent" android:layout_height="45dp" myapp:leftBackground="@drawable/left" myapp:leftText="Back" myapp:leftTextColor="#ffffff" myapp:rightBackground="@drawable/right" myapp:rightText="Move" myapp:rightTextColor="#ffffff" myapp:title2="title" myapp:titleTextColor2="#123412" myapp:titleTextSize2="18sp" > </com.qihoo.foo.TopBar> </LinearLayout> 

/com.foo.samples/TopBar.java

 private void init(Context context, AttributeSet attrs, int defStyle) { TypedArray ta = context.obtainStyledAttributes(attrs, R.styleable.Toolbar); // I can't get any value from below codes mLeftTextColor = ta.getColor(R.styleable.TopBar_leftTextColor, 0); mLeftBackground = ta.getDrawable(R.styleable.TopBar_leftBackground); mLeftText = ta.getString(R.styleable.TopBar_leftText); mRightTextColor = ta.getColor(R.styleable.TopBar_rightTextColor, 0); mRightBackground = ta.getDrawable(R.styleable.TopBar_rightBackground); mRightText = ta.getString(R.styleable.TopBar_rightText); mTitleTextSize = ta.getDimension(R.styleable.TopBar_titleTextSize2, 10); mTitleTextColor = ta.getColor(R.styleable.TopBar_titleTextColor2, 0); mTitle = ta.getString(R.styleable.TopBar_title2); ta.recycle(); }