使用兼容性包使用碎片来定位2.2。安卓片段生命周期中的方向变化
重新编码的活动使用的片段在一个应用程序我不能得到取向的变化/状态管理工作,所以我已经创建了一个FragmentActivity和一个片段一个小的测试应用程序之后。
来自方向更改的日志很奇怪,并且多次调用片段OnCreateView。
我显然缺少的东西 - 像detatching片段和重新安装它,而不是创建一个新的实例,但我看不出这将表明我要去哪里错了任何文件。
任何人都可以在我这里做错了请点亮一些。 谢谢
方向更改后的日志如下所示。
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
主要活动(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());
}
清单
<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>
我不知道这是否是一个正确的答案,但尝试使用标签添加片段时,添加(R.id.fragment_container,片段,“MYTAG”),或失败,替换(R.id.fragment_container,片段,“MYTAG”) – Jason
做一些调查。当主活动(FragmentTestActivity)在方向更改时重新启动,并且我获得FragmentManager的新实例时,执行FindFragmentByTag以找到它仍然存在的片段,以便在重新创建主活动时保留它的片段。如果我找到这个片段并且什么都不做,那么无论如何它都会用MainActivity重新显示。 – MartinS