Android学习（二） 标签滚动跳过

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

    xmlns:tools="http://schemas.android.com/tools"

    android:layout_width="match_parent"

    android:layout_height="match_parent"

    android:paddingBottom="@dimen/activity_vertical_margin"

    android:paddingLeft="@dimen/activity_horizontal_margin"

    android:paddingRight="@dimen/activity_horizontal_margin"

    android:paddingTop="@dimen/activity_vertical_margin"

    tools:context=".MainActivity" >



    <com.example.marqueetextview.MarqueeText

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:singleLine="true"

        android:ellipsize="marquee"

        android:focusable="true"

        android:focusableInTouchMode="true"

        android:text="@string/hello_world" />

    

    <com.example.marqueetextview.MarqueeText

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:layout_marginTop="20dp"

        android:singleLine="true"

        android:ellipsize="marquee"

        android:focusable="true"

        android:focusableInTouchMode="true"

        android:text="@string/hello_world" />



</RelativeLayout>

 

后台实现：

public class MarqueeText extends TextView{



    public MarqueeText(Context context, AttributeSet attrs, int defStyle) {

        super(context, attrs, defStyle);

        // TODO Auto-generated constructor stub

    }



    public MarqueeText(Context context, AttributeSet attrs) {

        super(context, attrs);

        // TODO Auto-generated constructor stub

    }



    public MarqueeText(Context context) {

        super(context);

        // TODO Auto-generated constructor stub

    }

    

    @Override

    @ExportedProperty(category = "focus")

    public boolean isFocused() {

        //继承TextView类，重写isFocused方法，返回true，因为marquee只有在当前控件获取焦点时才会滚动。

        return true;

    }



}