<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/id_paste_button"
    android:layout_width="0dp"
    android:layout_height="wrap_content"
    android:layout_weight="1"
    android:background="@drawable/bottom_item_selector"
    android:gravity="center"
    android:orientation="vertical"
    android:paddingBottom="4dp"
    android:paddingTop="4dp" >

    <ImageView
        android:id="@+id/btn_icon"
        android:layout_width="24dp"
        android:layout_height="24dp"
        android:src="@drawable/paste" />

    <TextView
        android:id="@+id/btn_txt"
        style="@style/myTextApprearence.micro.white"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="@string/tab_paste" />

</LinearLayout>

<?xml version="1.0" encoding="utf-8"?>
<resources>
    <declare-styleable name="BottomBarButton" >
        <attr name="android:text" type="text" />
        <attr name="android:icon" type="drawable" />
    </declare-styleable>
</resources>

public class BottomBarBtn extends LinearLayout{

    public BottomBarBtn(Context context, AttributeSet attrs) {
        super(context, attrs);
        LayoutInflater.from(context).inflate(R.layout.bottom_bar_button, this, true);
        
        TypedArray ta = context.obtainStyledAttributes(attrs, R.styleable.BottomBarButton);
        //获取自定义属性‘text‘的值
        CharSequence iconDesc = ta.getText(R.styleable.BottomBarButton_android_text);
        //获取自定义属性‘icon‘的值    
        Drawable icon = ta.getDrawable(R.styleable.BottomBarButton_android_icon);
        TextView btnText = (TextView) findViewById(R.id.btn_txt);
        if(null != iconDesc){
            btnText.setText(iconDesc);
        }
        ImageView btnIcon = (ImageView) findViewById(R.id.btn_icon);
        if(null != icon){
            btnIcon.setImageDrawable(icon);
        }
        ta.recycle();
    }
}

<!--下面的两个属性是自定义的:icon, text-->
<com.ui.customview.BottomBarBtn
            android:id="@+id/id_paste_button"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:icon="@drawable/paste"
            android:text="@string/tab_paste" />