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我正在處理FrameLayouts以支持加載不同片段的Activity。第一個片段是MapFragment,另一個片段是MapDownloadManagerFragment。這裏在FrameLayout上工作的地圖popBackStack()不起作用
我有一個關於popBackStack()方法的問題。 MapFragment不顯示任何地圖。它在popBackStack()執行後只顯示白色背景。
下面的代碼:
private MapFragment mMapFragment = null;
private FragmentTransaction mFragmentTransaction;
private MapDownloadManagerFragment mMapDownloadManagerFragment;
protected void onCreate(Bundle savedInstanceState) {
if (mMapFragment == null) {
mMapFragment = new MapFragment();
}
mFragmentTransaction = getFragmentManager().beginTransaction();
mFragmentTransaction.add(R.id.main_frame_layout, mMapFragment, mFragmentID);
mFragmentTransaction.setTransition(FragmentTransaction.TRANSIT_FRAGMENT_FADE);
mFragmentTransaction.commit();
}
private void onClickMenutItem() {
mMapDownloadManagerFragment = new MapDownloadManagerFragment();
mFragmentTransaction = getFragmentManager().beginTransaction();
mFragmentTransaction.replace(R.id.main_frame_layout, mMapDownloadManagerFragment, mdmFragmentID);
mFragmentTransaction.setTransition(FragmentTransaction.TRANSIT_FRAGMENT_FADE);
mFragmentTransaction.addToBackStack(null);
mFragmentTransaction.commit();
}
@Override
public void onBackPressed() {
Log.d(TAG, "Back stack count " + getFragmentManager().getBackStackEntryCount());
if(getFragmentManager().getBackStackEntryCount() == 0) {
finish();
} else {
getFragmentManager().popBackStack();
}
}
有沒有誰遇到過這個問題的人?我需要你的幫助。提前致謝。