使用Lollipop SDK在Android工具栏/ ActionBar中选中标题？ [英] Marquee title in Toolbar / ActionBar in Android with Lollipop SDK?

问题描述

我尝试了几种不同的方法，包括此处 （这反过来又让我尝试了两个最佳答案这个问题），以及使用反射来访问TextView并设置相关方法。两次尝试都失败了，前者导致根本没有文本被设置为标题（我将文本设置为正确的textview元素），后者设置文本并删除椭圆，但根本没有绘制。以下是我的反思尝试。

I've tried several different approaches, including the one found here (which in turn led me to trying both of the top answers to this question), as well as using reflection to get access to the TextView and setting the relevant methods. Both attempts failed, the former resulting in no text at all being set to the title (and I was setting the text to the proper textview element), the latter setting the text and removing the ellipse, but not marqueeing at all. Below is my reflection attempt.

import android.content.Context;
import android.support.v7.widget.Toolbar;
import android.text.TextUtils;
import android.util.AttributeSet;
import android.widget.TextView;
import android.widget.Toast;

import java.lang.reflect.Field;

public class MarqueeToolbar extends Toolbar {

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

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

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

    @Override
    public void setTitle(CharSequence title) {
        if (!reflected) {
            reflected = reflectTitle();
        }
        super.setTitle(title);
    }

    @Override
    public void setTitle(int resId) {
        if (!reflected) {
            reflected = reflectTitle();
        }
        super.setTitle(resId);
    }

    boolean reflected = false;
    private boolean reflectTitle() {
        try {
            Field field = Toolbar.class.getDeclaredField("mTitleTextView");
            field.setAccessible(true);
            TextView titleView = (TextView) field.get(this);
            titleView.setEllipsize(TextUtils.TruncateAt.MARQUEE);
            titleView.setMarqueeRepeatLimit(-1);
            return true;
        } catch (NoSuchFieldException e) {
            e.printStackTrace();
            return false;
        } catch (IllegalAccessException e) {
            e.printStackTrace();
            return false;
        } catch (NullPointerException e) {
            e.printStackTrace();
            return false;
        }
    }
}

推荐答案

最终想出来，这是因为，根据我的理解，设置选框的TextViews需要在实际开始选框之前被选中。我更新了我在问题中发布的MarqueeToolbar类，可以在这个Gist中找到： https：// gist .github.com / InsanityOnABun / 95c0757f2f527cc50e39

Figured it out eventually, it was because, from what I understand, TextViews that are set marquee need to be selected before they will actually start marqueeing. I updated my MarqueeToolbar class that I posted in the question, which can be found in this Gist: https://gist.github.com/InsanityOnABun/95c0757f2f527cc50e39

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