你可以阅读安卓here http://developer.android.com/reference/android/support/v7/app/ActionBar.html#setDisplayHomeAsUpEnabled(boolean) and here http://developer.android.com/reference/android/support/v7/app/ActionBar.html#setDisplayHomeAsUpEnabled(boolean)了解更多信息。还this https://stackoverflow.com/questions/14545139/android-back-button-in-the-title-bar问题可能有帮助