android简易跑马灯

重点：焦点的选择（返回true使得焦点不被选择）

MarqueeText.java

package com.example.demo02;

import android.content.Context;
import android.util.AttributeSet;
import android.view.ViewDebug.ExportedProperty;
import android.widget.TextView;

public class MarqueeText extends TextView{

public MarqueeText(Context context, AttributeSet attrs, int defStyleAttr) {
super(context, attrs, defStyleAttr);
// 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() {
// TODO Auto-generated method stub
return true;
}

}

activity_main.xml

<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="com.example.demo02.MainActivity" >

<com.example.demo02.MarqueeText
android:id="@+id/textview1"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:singleLine="true"
android:ellipsize="marquee"
android:focusable="true"
android:focusableInTouchMode="true"
android:text="@string/hello_world" />

<com.example.demo02.MarqueeText
android:layout_below="@+id/textview1"
android:layout_marginTop="10dp"
android:id="@+id/textview2"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:singleLine="true"
android:ellipsize="marquee"
android:focusable="true"
android:focusableInTouchMode="true"
android:text="@string/hello_world" />

</RelativeLayout>