AppCompatActivity

androidx.appcompat.app.AppCompatActivity
extends FragmentActivity implements AppCompatCallback,
TaskStackBuilder.SupportParentable, ActionBarDrawerToggle.DelegateProvider

成员：

    private AppCompatDelegate mDelegate;
    private Resources mResources;

FragmentActivity

androidx.fragment.app. FragmentActivity
extends ComponentActivity implements
ActivityCompat.OnRequestPermissionsResultCallback,
ActivityCompat.RequestPermissionsRequestCodeValidator
成员：

final FragmentController mFragments = FragmentController.createController(new HostCallbacks());
final LifecycleRegistry mFragmentLifecycleRegistry = new LifecycleRegistry(this);
boolean mCreated;
boolean mResumed;
boolean mStopped = true;
boolean mRequestedPermissionsFromFragment;
SparseArrayCompat<String> mPendingFragmentActivityResults;

AppCompatCallback

androidx.appcompat.app. AppCompatCallback
interface类型

TaskStackBuilder

为跨任务导航构建合成的回栈的实用工具类
在Android 3.0及更新版本上。

ActionBarDrawerToggle

ActionBar相关