应用程序图标未显示在标题栏中

Question

The App icon, definted in the manifest isn't showing in the latest 5.0.1. It looks just fine in the lesser software updates:

 <application
        android:allowBackup="true"
        android:icon="@drawable/airoperf"
        android:label="@string/app_name"
       >

Any ideas why this isn't working anymore?

Answer 1

It is working just fine. It is simply off by default, per Material Design.

Use getActionBar().setDisplayShowHomeEnabled(true); (native action bar) or getSupportActionBar().setDisplayShowHomeEnabled(true); ( appcompat-v7 action bar) to enable it.

Answer 2

Here's another way -

getSupportActionBar().setDisplayShowHomeEnabled(true);
getSupportActionBar().setLogo(R.mipmap.ic_launcher);
getSupportActionBar().setDisplayUseLogoEnabled(true);