使用兼容包以使用Fragments定位2.2.
重新编码活动以在应用程序中使用片段后,我无法获得方向更改/状态管理工作,因此我创建了一个带有单个FragmentActivity和单个片段的小型测试应用程序.
方向更改的日志很奇怪,多次调用片段OnCreateView.
我显然缺少一些东西 - 比如分离片段并重新连接它而不是创建一个新实例,但是我看不到任何可以指示我出错的文档.
请问有人能说清楚我在做错了吗.谢谢
方向更改后的日志如下.
Initial creation
12-04 11:57:15.808: D/FragmentTest.FragmentTestActivity(3143): onCreate
12-04 11:57:15.945: D/FragmentTest.FragmentOne(3143): OnCreateView
12-04 11:57:16.081: D/FragmentTest.FragmentOne(3143): OnCreateView->SavedInstanceState null
Orientation Change 1
12-04 11:57:39.031: D/FragmentTest.FragmentOne(3143): onSaveInstanceState
12-04 11:57:39.031: D/FragmentTest.FragmentTestActivity(3143): onCreate
12-04 11:57:39.031: D/FragmentTest.FragmentOne(3143): OnCreateView
12-04 11:57:39.031: D/FragmentTest.FragmentOne(3143): OnCreateView->SavedInstanceState not null
12-04 11:57:39.031: D/FragmentTest.FragmentOne(3143): OnCreateView
12-04 11:57:39.167: D/FragmentTest.FragmentOne(3143): OnCreateView->SavedInstanceState null
Orientation Change 2
12-04 11:58:32.162: D/FragmentTest.FragmentOne(3143): onSaveInstanceState
12-04 11:58:32.162: D/FragmentTest.FragmentOne(3143): onSaveInstanceState
12-04 11:58:32.361: D/FragmentTest.FragmentTestActivity(3143): onCreate
12-04 11:58:32.361: D/FragmentTest.FragmentOne(3143): OnCreateView
12-04 11:58:32.361: D/FragmentTest.FragmentOne(3143): OnCreateView->SavedInstanceState not null
12-04 11:58:32.361: …我有一个PictureFragment,用于从我的缩略图中选择全屏显示图片.它工作正常,但是当我旋转我的智能手机时,图片也会旋转并变得非常难看,因为它的高度现在是它的实际宽度等等.如何关闭此片段的旋转？我一直在阅读如何为整个活动做这件事但是对于剩下的活动而言,我希望保持自动旋转.或者,如果这也很容易,我怎样才能设法在旋转时刻意缩放图片以保持其纵横比？
我感谢任何帮助.
我有一个listFragment这是我的onActivityCreated:
@Override
public void onActivityCreated(Bundle savedInstanceState) {
super.onActivityCreated(savedInstanceState);
if (savedInstanceState != null) {
utenti=savedInstanceState.getParcelableArrayList("array");
}else{
threadutenti= (GetUtenti) new GetUtenti(this.getActivity(), utenti).execute();
}
当我旋转我的设备时,我有第一个savedInstanceState非null(我知道了)但是在使用onActivityCreated null调用onActivityCreated之后!为什么？我想在ListFragment上获取我的对象utenti而不是我的活动..
当EditTextUI中的一行获得焦点时,将DatePickerFragment启动用户输入日期.
在方向更改时,如果EditText线具有焦点和先前输入的日期(这样length() > 0),我不希望片段自动显示.
有没有办法修改或添加代码,以便如果新创建活动并且该EditText行具有焦点,它将不会自动启动 DatePickerFragment？
做某事是不是一个好主意onResume()？
或做的东西savedInstanceState()和!=null？
public class Activity extends AppCompatActivity {
...
EditText.setOnFocusChangeListener(new OnFocusChangeListener() {
@Override
public void onFocusChange(View v, boolean hasFocus) {
...
if (hasFocus && (EditText.getText().length() == 0)) {
DatePickerFragment newFragment = new DatePickerFragment();
newFragment.show(getSupportFragmentManager(), "datePicker");
}
else if (hasFocus && (EditText.getText().length() > 0)) {
...
DatePickerFragment newFragment = new DatePickerFragment();
newFragment.show(getSupportFragmentManager(), "datePicker");
}
}
});
}
我有简单的活动和片段交易。我注意到在Fragment的oncreateView上的配置更改被两次调用。为什么会这样呢？
活动代码在这里：
@Override
protected void onCreate(Bundle savedInstanceState) {
System.out.println("Activity created");
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
FragmentManager manager = getSupportFragmentManager();
BlankFragment fragment = new BlankFragment();
addFragmentToActivity(manager,
fragment,
R.id.root_activity_create
);
}
public static void addFragmentToActivity (FragmentManager fragmentManager,
Fragment fragment,
int frameId)
{
FragmentTransaction transaction = fragmentManager.beginTransaction();
transaction.replace(frameId, fragment);
transaction.commit();
}
片段代码在这里：
public class BlankFragment extends Fragment {
public BlankFragment() {
// Required empty public constructor
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// Inflate the layout for this fragment
return inflater.inflate(R.layout.fragment_blank, …