Android 实现跑马灯效果MarqueeTextView

要实现跑马灯效果则需要获取焦点，当失去焦点的时候滚动会停止

代码

<xxx.MarqueeTextView
    android:id="@+id/ps_tv_title"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_centerVertical="true"
    android:ellipsize="marquee"
    android:focusable="true"
    android:focusableInTouchMode="true"
    android:gravity="center"
    android:includeFontPadding="false"
    android:marqueeRepeatLimit="marquee_forever"
    android:scrollHorizontally="true"
    android:singleLine="true"
    android:textColor="@color/ps_color_33"
    android:textSize="14sp"
    tools:text="@string/ps_camera_roll" />

public class MarqueeTextView extends AppCompatTextView {

    public MarqueeTextView(Context context) {
        super(context);
    }

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


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

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

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

    @Override
    public void onWindowFocusChanged(boolean hasWindowFocus) {
        if (hasWindowFocus) {
            super.onWindowFocusChanged(true);
        }
    }
}