要想實(shí)現(xiàn)一直循環(huán)的跑馬燈效果，需要重寫isFocused()方法使其一直處于獲取焦點(diǎn)狀態(tài)，并且onFocusChanged()里面不能調(diào)用父類的方法，否則跑馬燈將會(huì)停止。下面是自定義的跑馬燈TextView。

public class MarqueeTextView extends AppCompatTextView {
    public MarqueeTextView(Context context) {
        super(context);
    }

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

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

    @Override
    public boolean isFocused() {
        return true;
    }

    @Override
    protected void onFocusChanged(boolean focused, int direction, Rect previouslyFocusedRect) {
        super.onFocusChanged(true, direction, previouslyFocusedRect);
    }
}

在XML文件中使用方法，里面的這些屬性不能缺少：

<com.gaoshijie.android.marqueetextview.MarqueeTextView
        android:layout_width="200dp"
        android:layout_height="wrap_content"
        android:ellipsize="marquee"
        android:focusable="true"
        android:focusableInTouchMode="true"
        android:singleLine="true"
        android:marqueeRepeatLimit="marquee_forever" />