android textView跑马灯效果

public class MarqueeText extends TextView {
public MarqueeText(Context context) {
super(context);
}

public MarqueeText(Context context, AttributeSet attrs) {
super(context, attrs);
}

public MarqueeText(Context context, AttributeSet attrs, int defStyleAttr, int defStyleRes) {
super(context, attrs, defStyleAttr, defStyleRes);
}

@Override
public boolean isFocused() {
return true;//此处使得文本一直获得焦点
}

@Override
protected void onFocusChanged(boolean focused, int direction, Rect previouslyFocusedRect) {
//此处是为了防止焦点改变而效果消失
}
}

<com.example.textviewsample.MarqueeText
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/text"
android:id="@+id/text_view1"
android:ellipsize="marquee"
android:singLine = "true"
android:focusable="true"
android:focusableInTouchMode="true"
android:marqueeRepeatLimit="marquee_forever"/>
//使跑马灯一直不停