通过反射ToolBar中TextView的setEllipsize方法，设置标题中间为截断位置
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private void setEllipsize(Toolbar toolBar) {
try {
Field field = Toolbar.class.getDeclaredField("mTitleTextView");
field.setAccessible(true);
TextView textView = (TextView) field.get(toolBar);
textView.setEllipsize(TextUtils.TruncateAt.MIDDLE);
} catch (Exception ignored) {
Log.e(LOG_TAG, ignored.getMessage());
}
}