Android-标准工具栏高度

The recommended minimum size for touchable elements is 48 dp, see this page for more detailed metrics.

Its best to use ?attr/actionBarSize as @Jaison Brooks commented.

In the material guidelines, suggested height is 56dp:

Toolbar: 56dp

You can use the following method to get the AppBar height programatically

private static final int DEFAULT_TOOLBAR_HEIGHT = 56;


private static int toolBarHeight = -1;


public static int getToolBarHeight(Context context) {
if (toolBarHeight > 0) {
return toolBarHeight;
}
final Resources resources = context.getResources();
final int resourceId = resources.getIdentifier("action_bar_size", "dimen", "android");
toolBarHeight = resourceId > 0 ?
resources.getDimensionPixelSize(resourceId) :
(int) convertDpToPixel(DEFAULT_TOOLBAR_HEIGHT);
return toolBarHeight;
}


public static float convertDpToPixel(Context context, float dp) {
float scale = context.getResources().getDisplayMetrics().density;
return dp * scale + 0.5f;
}

For phones it is 56dp and for large devices like tablets which you have more spaces it could be 64dp

In addition to @vedant1811 answer, you can programmatically obtain actionBarSize from attrs:

TypedValue tv = new TypedValue();
if (context.getTheme().resolveAttribute(android.R.attr.actionBarSize, tv, true))
{
actionBarHeight = TypedValue.complexToDimensionPixelSize(tv.data, context.getResources().getDisplayMetrics());
}

you can use the toolbar widget that already exist in android and put the height wrap_content , so it will better to get the default size that come with it.

here

<android.support.v7.widget.Toolbar
android:id="@+id/toolbar"
android:layout_height="wrap_content"
android:layout_width="match_parent"
android:background="@color/dark_cerulean">


<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal"
android:paddingEnd="16dp"
android:paddingStart="16dp">


<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_weight="1"
android:layout_gravity="end"
android:gravity="end"
android:layout_marginEnd="16dp"
android:textColor="@color/white"
android:id="@+id/toolbar_title" />


<ImageView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:src="@drawable/image1"
android:id="@+id/image"/>


</LinearLayout>




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

Here's my Kotlin solution

fun getActionBarHeight(activity: Activity): Int {
val typedValue = TypedValue()
if (activity.theme.resolveAttribute(
android.R.attr.actionBarSize,
typedValue,
true
)
) return TypedValue.complexToDimensionPixelSize(
typedValue.data,
activity.resources.displayMetrics
)
return 0
}