Fragment启动流程-思维导图

Fragment启动分析

performLaunchActivity(...)

实例化Activity

final FragmentController mFragments = FragmentController.createController(new HostCallbacks());

public HostCallbacks() {\u00A0 \u00A0 \u00A0 \u00A0 \u00A0 \u00A0 super(Activity.this );\u00A0 \u00A0 \u00A0 \u00A0 }

final FragmentManagerImpl mFragmentManager = new FragmentManagerImpl();

public static final FragmentController createController(FragmentHostCallback callbacks) {\u00A0 \u00A0 \u00A0 \u00A0 return new FragmentController(callbacks);\u00A0 \u00A0 }

private FragmentController(FragmentHostCallback callbacks) {\u00A0 \u00A0 \u00A0 \u00A0 mHost = callbacks;\u00A0 \u00A0 }

activity.attach(...)

mFragments.attachHost(null);

final void performCreate(Bundle icicle) {\u00A0 \u00A0 \u00A0 \u00A0 onCreate(icicle);\u00A0 \u00A0 \u00A0 \u00A0 ...\u00A0 \u00A0 \u00A0 \u00A0 performCreateCommon();\u00A0 \u00A0 }

protected void onCreate(@Nullable Bundle savedInstanceState) {...mFragments.dispatchCreate();...}

public void dispatchCreate() {\u00A0 \u00A0 \u00A0 \u00A0 mHost.mFragmentManager.dispatchCreate();\u00A0 \u00A0 }

public FragmentManager getFragmentManager() {\u00A0 \u00A0 \u00A0 \u00A0 return mFragments.getFragmentManager();\u00A0 \u00A0 }

public FragmentManager getFragmentManager() {\u00A0 \u00A0 \u00A0 \u00A0 return mHost.getFragmentManagerImpl();\u00A0 \u00A0 }

FragmentManagerImpl getFragmentManagerImpl() {\u00A0 \u00A0 \u00A0 \u00A0 return mFragmentManager;\u00A0 \u00A0 }

public FragmentTransaction beginTransaction() {\u00A0 \u00A0 \u00A0 \u00A0 return new BackStackRecord(this);\u00A0 \u00A0 }

public BackStackRecord(FragmentManagerImpl manager) {\u00A0 \u00A0 \u00A0 \u00A0 mManager = manager;\u00A0 \u00A0 }

void addOp(Op op) {\u00A0 \u00A0 \u00A0 \u00A0 if (mHead == null) {\u00A0 \u00A0 \u00A0 \u00A0 \u00A0 \u00A0 mHead = mTail = op;\u00A0 \u00A0 \u00A0 \u00A0 } else {\u00A0 \u00A0 \u00A0 \u00A0 \u00A0 \u00A0 op.prev = mTail;\u00A0 \u00A0 \u00A0 \u00A0 \u00A0 \u00A0 mTail.next = op;\u00A0 \u00A0 \u00A0 \u00A0 \u00A0 \u00A0 mTail = op;\u00A0 \u00A0 \u00A0 \u00A0 }\u00A0 \u00A0 \u00A0 \u00A0 op.enterAnim = mEnterAnim;\u00A0 \u00A0 \u00A0 \u00A0 op.exitAnim = mExitAnim;\u00A0 \u00A0 \u00A0 \u00A0 op.popEnterAnim = mPopEnterAnim;\u00A0 \u00A0 \u00A0 \u00A0 op.popExitAnim = mPopExitAnim;\u00A0 \u00A0 \u00A0 \u00A0 mNumOp++;\u00A0 \u00A0 }

\u00A0public int commit() {\u00A0 \u00A0 \u00A0 \u00A0 return commitInternal(false);\u00A0 \u00A0 }

Runnable mExecCommit = new Runnable() {\u00A0 \u00A0 \u00A0 \u00A0 @Override\u00A0 \u00A0 \u00A0 \u00A0 public void run() {\u00A0 \u00A0 \u00A0 \u00A0 \u00A0 \u00A0 execPendingActions();\u00A0 \u00A0 \u00A0 \u00A0 }\u00A0 \u00A0 };

\u00A0 \u00A0 public boolean execPendingActions() {\u00A0 \u00A0 \u00A0 \u00A0 ...\u00A0 \u00A0 \u00A0 \u00A0 boolean didSomething = false;\u00A0 \u00A0 \u00A0 \u00A0 while (true) {\u00A0 \u00A0 \u00A0 \u00A0 \u00A0 \u00A0 int numActions;\u00A0 \u00A0 \u00A0 \u00A0 \u00A0 \u00A0\u00A0\u00A0 \u00A0 \u00A0 \u00A0 \u00A0 \u00A0 synchronized (this) {\u00A0 \u00A0 \u00A0 \u00A0 \u00A0 \u00A0 \u00A0 \u00A0 if (mPendingActions == null || mPendingActions.size() == 0) {\u00A0 \u00A0 \u00A0 \u00A0 \u00A0 \u00A0 \u00A0 \u00A0 \u00A0 \u00A0 break;\u00A0 \u00A0 \u00A0 \u00A0 \u00A0 \u00A0 \u00A0 \u00A0 }\u00A0 \u00A0 \u00A0 \u00A0 \u00A0 \u00A0 \u00A0 \u00A0\u00A0\u00A0 \u00A0 \u00A0 \u00A0 \u00A0 \u00A0 \u00A0 \u00A0 numActions = mPendingActions.size();\u00A0 \u00A0 \u00A0 \u00A0 \u00A0 \u00A0 \u00A0 \u00A0 if (mTmpActions == null || mTmpActions.length numActions) {\u00A0 \u00A0 \u00A0 \u00A0 \u00A0 \u00A0 \u00A0 \u00A0 \u00A0 \u00A0 mTmpActions = new Runnable[numActions];\u00A0 \u00A0 \u00A0 \u00A0 \u00A0 \u00A0 \u00A0 \u00A0 }\u00A0 \u00A0 \u00A0 \u00A0 \u00A0 \u00A0 \u00A0 \u00A0 mPendingActions.toArray(mTmpActions);\u00A0 \u00A0 \u00A0 \u00A0 \u00A0 \u00A0 \u00A0 \u00A0 mPendingActions.clear();\u00A0 \u00A0 \u00A0 \u00A0 \u00A0 \u00A0 \u00A0 \u00A0 mHost.getHandler().removeCallbacks(mExecCommit);\u00A0 \u00A0 \u00A0 \u00A0 \u00A0 \u00A0 }\u00A0 \u00A0 \u00A0 \u00A0 \u00A0 \u00A0\u00A0\u00A0 \u00A0 \u00A0 \u00A0 \u00A0 \u00A0 mExecutingActions = true;\u00A0 \u00A0 \u00A0 \u00A0 \u00A0 \u00A0 for (int i=0; inumActions; i++) {\u00A0 \u00A0 \u00A0 \u00A0 \u00A0 \u00A0 \u00A0 \u00A0 mTmpActions[i].run();\u00A0 \u00A0 \u00A0 \u00A0 \u00A0 \u00A0 \u00A0 \u00A0 mTmpActions[i] = null;\u00A0 \u00A0 \u00A0 \u00A0 \u00A0 \u00A0 }\u00A0 \u00A0 \u00A0 \u00A0 \u00A0 \u00A0 mExecutingActions = false;\u00A0 \u00A0 \u00A0 \u00A0 \u00A0 \u00A0 didSomething = true;\u00A0 \u00A0 \u00A0 \u00A0 }\u00A0 \u00A0 \u00A0 \u00A0 ...\u00A0 \u00A0 \u00A0 \u00A0 return didSomething;\u00A0 \u00A0 }

public void onAttach(Context context) {...}

void performCreate(Bundle savedInstanceState) {\u00A0 \u00A0 \u00A0 \u00A0 ...\u00A0 \u00A0 \u00A0 \u00A0 onCreate(savedInstanceState);\u00A0 \u00A0 \u00A0 \u00A0 ...\u00A0 \u00A0 }

public void onCreate(@Nullable Bundle savedInstanceState) {...}

final void performCreateCommon() {\u00A0 \u00A0 \u00A0 \u00A0 ...\u00A0 \u00A0 \u00A0 \u00A0 mFragments.dispatchActivityCreated();\u00A0 \u00A0 \u00A0 \u00A0 ...\u00A0 \u00A0 }

public void dispatchActivityCreated() {\u00A0 \u00A0 \u00A0 \u00A0 mHost.mFragmentManager.dispatchActivityCreated();\u00A0 \u00A0 }

void performActivityCreated(Bundle savedInstanceState) {\u00A0 \u00A0 \u00A0 \u00A0 ...\u00A0 \u00A0 \u00A0 \u00A0 onActivityCreated(savedInstanceState);\u00A0 \u00A0 \u00A0 \u00A0 ...\u00A0 \u00A0 }

public void onActivityCreated(@Nullable Bundle savedInstanceState) {\u00A0 \u00A0 \u00A0 \u00A0 ...\u00A0 \u00A0 }