我有一个"活动A"启动两个片段,主页按钮是活动A的一部分,当从createFragment按下后退按钮时,它应该返回到活动A之前的活动,它使用finish()方法做得很好但是当我有第二个片段,followersFragment,它添加在createFragment的ontop上并隐藏了createFragment(因为我不希望信息在创建中丢失),然后我点击后退按钮然后切换回创建片段但是当我点击时来自createFragment的后退按钮它不会再回到活动A而且什么都不做......没有错误...
这是我保存片段(不是活动A)的活动的代码:
@Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar actions click
switch (item.getItemId()) {
// lets user travel back to where they came from
case android.R.id.home:
if(displayShown == 1) {
displayView(2, 0);
} else {
}
return true;
private void displayView(int i, int position) {
Log.d(Constants.DEBUG, "display view called " +position);
boolean createPost = true;
// update the main content by replacing fragments
Fragment fragment = null;
switch (position) {
case 0:
//avoid recreating createPostFragment if already created because all data will be erased
if(createPostFragment == null){
createPost = false;
Log.d(Constants.DEBUG, "fragment create DOES NOT EXIST ");
createPostFragment = new CreatePostFragment();
}
fragment = createPostFragment;
break;
case 1:
followerFragment = new FollowerFragment();
fragment = followerFragment;
break;
default:
break;
}
if (fragment != null) {
FragmentManager fragmentManager = getFragmentManager();
trans = fragmentManager.beginTransaction();
//if createpostfrag already created just show
if (createPost && position == 0) {
trans.remove(followerFragment);
trans.show(createPostFragment);
trans.commit();
//hide createpostfrag so we can reuse
} else {
if(position == 1) {
Bundle extraData = new Bundle();
extraData.putInt("follow", i);
fragment.setArguments(extraData);
trans.add(R.id.frame_container, fragment, null).commit();
trans.hide(createPostFragment);
}
if(position == 0) {
trans.add(R.id.frame_container, fragment, "keepAlive").commit();
}
}
} else {
// error in creating fragment
Log.d(Constants.DEBUG, "Error in creating fragment or no fragment needed");
}
}