追踪报错日志的来源
//第二步:
public FragmentManager getSupportFragmentManager() {
return mHost.getFragmentManagerImpl();
}
//第三步：
FragmentManagerImpl getFragmentManagerImpl() {
return mFragmentManager;
}
//第四步：看beginTransaction()方法@Override
br/>@Override
return new BackStackRecord(this);
}
//第五步：看BackStackRecord类中看commit方法@Override
br/>@Override
return commitInternal(false);
}
@Override
public int commitAllowingStateLoss() {
return commitInternal(true);
}
//第六步：可以看到这俩函数的区别就是commitInternal()方法中参数一个为true，一个为false
int commitInternal(boolean allowStateLoss) {
if (mCommitted) throw new IllegalStateException("commit already called");
if (FragmentManagerImpl.DEBUG) {
Log.v(TAG, "Commit: " + this);
LogWriter logw = new LogWriter(TAG);
PrintWriter pw = new PrintWriter(logw);
dump(" ", null, pw, null);
pw.close();
}
mCommitted = true;
if (mAddToBackStack) {
mIndex = mManager.allocBackStackIndex(this);
} else {
mIndex = -1;
}
mManager.enqueueAction(this, allowStateLoss);
return mIndex;
}
//第七步：再追踪到enqueueAction(this,allowStateLoss)
public void enqueueAction(OpGenerator action, boolean allowStateLoss) {
if (!allowStateLoss) {
checkStateLoss();
}
synchronized (this) {
if (mDestroyed || mHost == null) {
throw new IllegalStateException("Activity has been destroyed");
}
if (mPendingActions == null) {
mPendingActions = new ArrayList<>();
}
mPendingActions.add(action);
scheduleCommit();
}
}
//第八步：checkStateLoss()方法，这里可以看到抛出的错误日志呢
private void checkStateLoss() {
if (mStateSaved) {
throw new IllegalStateException(
"Can not perform this action after onSaveInstanceState");
}
if (mNoTransactionsBecause != null) {
throw new IllegalStateException(
"Can not perform this action inside of " + mNoTransactionsBecause);
}
}
