Android多行工具栏标题 [英] Android Multiline Toolbar Title

问题描述

我有一个工具栏，当它在横向模式下不像平常那​​样宽，但它的高度比平常高，因此我想将标题设置为多行（准确地说是2行）在景观中。我尝试了一些将TextView放在工具栏中的东西，但是当我尝试访问TextView来设置它的标题时（因为标题是可变的）我在使用findViewById后得到一个NullPointer。

I have a Toolbar that when in landscape mode isn't as wide as usual, but it has more height than usual and for that reason I want to set the title to be multiline (2 lines to be precise) when it is in landscape. I have tried some things where I put a TextView inside of the Toolbar, but when I try to access the TextView to set it's title (since the the title is variable) I get a NullPointer after using findViewById.

以下是当前情况的一些代码（没有多行）：

Here is some code of the current situation (without multiline):

@Override
protected void onResume() {
    super.onResume();
    Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar2);
    setSupportActionBar(toolbar);
    getSupportActionBar().setDisplayHomeAsUpEnabled(true);
    if (getResources().getConfiguration().orientation == Configuration.ORIENTATION_LANDSCAPE) {
        Display display = getWindowManager().getDefaultDisplay();
        Point size = new Point();
        display.getSize(size);
        int width = (int)( size.x * 0.37);
        int height =  Math.round(size.x * 0.63f * 0.25f);
        RelativeLayout.LayoutParams params = new RelativeLayout.LayoutParams(width,height);
        toolbar.setLayoutParams(params);
    }
    if (executeOnResume) {
        currentProject = getIntent().getParcelableExtra("Project");
        getSupportActionBar().setTitle("This is a pretty long piece of text, I hope it fits");
        // A lot of irrelevant code...
        //...
        //...
    } else { loadStuff();}
}

这是工具栏xml：

<android.support.v7.widget.Toolbar
        android:id="@+id/toolbar2"
        android:title="@string/menuLabel1a"
        app:layout_widthPercent="37%"
        app:layout_heightPercent="26%"
        android:gravity="top"
        app:titleTextAppearance="@style/toolbarTitleText"
        android:background="@color/greyLight"
        android:theme="@style/AppTheme.AppBarOverlay"
        app:popupTheme="@style/AppTheme.PopupOverlay" />

推荐答案

试试这个：

 <android.support.v7.widget.Toolbar
    android:id="@+id/toolbar2"
    android:layout_width="match_parent"
    android:layout_height="@dimen/double_height_toolbar"
    android:gravity="top"
    app:titleTextAppearance="@style/toolbarTitleText"
    android:background="@color/greyLight"
    android:theme="@style/AppTheme.AppBarOverlay"
    app:popupTheme="@style/AppTheme.PopupOverlay">

        <TextView
            android:id="@+id/product_details_title"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:gravity="top"
            android:title="@string/menuLabel1a"
            android:paddingTop="@dimen/padding_normal"
            style="@android:style/TextAppearance.Holo.Widget.ActionBar.Title.Inverse"
            android:maxLines="2" />

</android.support.v7.widget.Toolbar>

其他解决方案适用于ActionBar

ActionBar的默认TextView不支持换行，并且没有公开的方法将其设置为换行。因此，您可以创建灵活的布局，如下所示： action_bar_title_layout.xml ：

The default TextView of the ActionBar does not support line wrapping, and there is no exposed method to set it to wrap. So you can create a flexible layout, like this: action_bar_title_layout.xml:

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical">

<TextView
    android:id="@+id/action_bar_title"
    android:layout_height="match_parent"
    android:layout_width="wrap_content"
    android:gravity="center_vertical"
    android:ellipsize="end"
    android:maxLines="2"/>

</LinearLayout>

然后将其设置为ActionBar上的自定义布局：

Then set this as the custom layout on your ActionBar:

ActionBar actionBar = getActionBar();
actionBar.setDisplayShowCustomEnabled(true);
actionBar.setCustomView(R.layout.action_bar_title_layout);
((TextView) findViewById(R.id.action_bar_title)).setText(
    "This is a long text title that will wrap to multiple lines, when necessary.");

这篇关于Android多行工具栏标题的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！