使用兼容性包使用碎片來定位2.2。安卓片段生命週期中的方向變化
重新編碼的活動使用的片段在一個應用程序我不能得到取向的變化/狀態管理工作,所以我已經創建了一個FragmentActivity和一個片段一個小的測試應用程序之後。
來自方向更改的日誌很奇怪,並且多次調用片段OnCreateView。
我顯然缺少的東西 - 像detatching片段和重新安裝它,而不是創建一個新的實例,但我看不出這將表明我要去哪裏錯了任何文件。
任何人都可以在我這裏做錯了請點亮一些。 謝謝
方向更改後的日誌如下所示。
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: D/FragmentTest.FragmentOne(3143): OnCreateView
12-04 11:58:32.361: D/FragmentTest.FragmentOne(3143): OnCreateView->SavedInstanceState not null
12-04 11:58:32.498: D/FragmentTest.FragmentOne(3143): OnCreateView
12-04 11:58:32.498: D/FragmentTest.FragmentOne(3143): OnCreateView->SavedInstanceState null
主要活動(FragmentActivity)
public class FragmentTestActivity extends FragmentActivity {
/** Called when the activity is first created. */
private static final String TAG = "FragmentTest.FragmentTestActivity";
FragmentManager mFragmentManager;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
Log.d(TAG, "onCreate");
mFragmentManager = getSupportFragmentManager();
FragmentTransaction fragmentTransaction = mFragmentManager.beginTransaction();
FragmentOne fragment = new FragmentOne();
fragmentTransaction.add(R.id.fragment_container, fragment);
fragmentTransaction.commit();
}
和碎片
public class FragmentOne extends Fragment {
private static final String TAG = "FragmentTest.FragmentOne";
EditText mEditText;
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
Log.d(TAG, "OnCreateView");
View v = inflater.inflate(R.layout.fragmentonelayout, container, false);
// Retrieve the text editor, and restore the last saved state if needed.
mEditText = (EditText)v.findViewById(R.id.editText1);
if (savedInstanceState != null) {
Log.d(TAG, "OnCreateView->SavedInstanceState not null");
mEditText.setText(savedInstanceState.getCharSequence("text"));
}
else {
Log.d(TAG,"OnCreateView->SavedInstanceState null");
}
return v;
}
@Override
public void onSaveInstanceState(Bundle outState) {
super.onSaveInstanceState(outState);
Log.d(TAG, "FragmentOne.onSaveInstanceState");
// Remember the current text, to restore if we later restart.
outState.putCharSequence("text", mEditText.getText());
}
清單
<uses-sdk android:minSdkVersion="8" />
<application
android:icon="@drawable/ic_launcher"
android:label="@string/app_name" >
<activity
android:label="@string/app_name"
android:name=".activities.FragmentTestActivity"
android:configChanges="orientation">
<intent-filter >
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>
我不知道這是否是一個正確的答案,但嘗試使用標籤添加片段時,添加(R.id.fragment_container,片段,「MYTAG」),或失敗,替換(R.id.fragment_container,片段,「MYTAG」) – Jason
做一些調查。當主活動(FragmentTestActivity)在方向更改時重新啓動,並且我獲得FragmentManager的新實例時,執行FindFragmentByTag以找到它仍然存在的片段,以便在重新創建主活動時保留它的片段。如果我找到這個片段並且什麼都不做,那麼無論如何它都會用MainActivity重新顯示。 – MartinS