Toolbar title not in center when Back Button is enable

问题

I'm trying to display my toolbar title in the center and to do it I use the method which is given in this answer :-Toolbar Center title

However, when I enable back button in my activity by following code:

toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
mActionBar = getSupportActionBar();
mActionBar.setDisplayHomeAsUpEnabled(true);
mActionBar.setDisplayShowHomeEnabled(true);

The title of toolbar doesn't show up in the center but slightly off-centered towards the right.

How can I achieve centered title without being affected by the back button or menu bar?

回答1:

Add a TextView inside the Toolbar & don't forget to set the following attribute inside your TextView.

android:layout_marginRight="?android:attr/actionBarSize"

OR

android:layout_marginEnd="?android:attr/actionBarSize"

code snippet:

<android.support.v7.widget.Toolbar
    android:id="@+id/custom_toolbar"
    android:layout_width="match_parent"
    android:layout_height="?android:attr/actionBarSize"
    android:background="@android:color/holo_red_dark">
    <TextView
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="abc"
        android:textColor="@android:color/white"
        android:textSize="20sp"
        android:layout_marginRight="?android:attr/actionBarSize"
        android:gravity="center"/>

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

Refer to this tutorial for more information.

回答2:

Having a placeholder image the same size as the back arrow and setting it to be invisible when the back arrow is not shown and gone when it's displayed did the trick for me.

<?xml version="1.0" encoding="utf-8"?>
<android.support.v7.widget.Toolbar
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:id="@+id/toolbar"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:background="@color/blue"
    android:minHeight="?attr/actionBarSize"
    app:contentInsetEnd="0dp"
    app:contentInsetLeft="0dp"
    app:contentInsetRight="0dp"
    app:contentInsetStart="0dp"
    app:popupTheme="@style/ThemeOverlay.AppCompat.Light"
    app:theme="@style/ThemeOverlay.AppCompat.Dark.ActionBar">

<ImageView
    android:id="@+id/iv_placeholder"
    android:layout_width="72dp"
    android:layout_height="48dp"
    android:src="@drawable/ic_actionbar_hamburger"
    android:visibility="invisible"/>


<TextView
    android:id="@+id/logo_tv"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:layout_marginEnd="?attr/actionBarSize"
    android:gravity="center"
    android:text=""
    android:textColor="@color/white"
    android:textStyle="normal"/>

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

回答3:

Just add android:paddingEnd="72dp; to the Toolbar layout.

<android.support.v7.widget.Toolbar
                android:id="@+id/toolbar"
                android:layout_width="match_parent"
                android:layout_height="?android:attr/actionBarSize"
                app:contentScrim="@color/colorPrimary"
                app:layout_collapseMode="pin"
                android:paddingEnd="72dp"
                app:popupTheme="@style/ThemeOverlay.AppCompat.Dark"
                app:title="Title">

a simple workaround

回答4:

The reason why the title is not centered when you use a back button as navigation icon, is that navigation icon is represented as AppCompatImageButton and is added to the same layout as your title TextView. Using Arshak's answer is not a bad idea, but ?android:attr/actionBarSize is not a good way to define the end margin. As the action bar height is probably the same size as icon's width, it might work, but might not work on all devices. Could be a good idea to specify this size from material design guidelines.

回答5:

Dont set propterties like this

mActionBar = getSupportActionBar();
mActionBar.setDisplayHomeAsUpEnabled(true);
mActionBar.setDisplayShowHomeEnabled(true);

Do like this

        Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
        // Title and subtitle
        toolbar.setTitle(R.string.about_toolbar_title);
        toolbar.setSubtitleTextColor(Color.WHITE);
        toolbar.setTitleTextColor(Color.WHITE);
        toolbar.setBackgroundColor(getResources().getColor(
                R.color.themeToolbarColor));
        toolbar.setNavigationIcon(R.drawable.ic_action_back);
        toolbar.setNavigationOnClickListener(new OnClickListener() {

            @Override
            public void onClick(View v) {
               finish();  // to go back  finish() will do your work.
                //mActionBar.setDisplayHomeAsUpEnabled(true);
                //mActionBar.setDisplayShowHomeEnabled(true);
            }
        });

来源：https://stackoverflow.com/questions/38582331/toolbar-title-not-in-center-when-back-button-is-enable

标签

android

android-toolbar