android跑马灯

以前做过跑马灯的需求，今天又遇到了，再此mark下。
自定义TextView:

package com.adups.fota;

import android.content.Context;
import android.graphics.Rect;
import android.text.TextUtils;
import android.util.AttributeSet;
import android.widget.TextView;

/**
 * Created by wilson on 2017/5/31.
 */

public class MyTextView extends TextView {

    public MyTextView(Context context) {
        super(context);
        createView();
    }

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

    public MyTextView(Context context, AttributeSet attrs, int defStyle) {
        super(context, attrs, defStyle);
        createView();
    }

    private void createView() {
        setEllipsize(TextUtils.TruncateAt.MARQUEE);
        setMarqueeRepeatLimit(-1);
        setFocusableInTouchMode(true);
    }

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

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

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

}

布局引用：

<com.adups.fota.MyTextView        
        android:singleLine="true"

通过复写isFocused()为true就可以实现多个TextView同时跑马灯的效果