1

我使用setRetainInstance(true)on SherlockListFragment，并希望它在屏幕旋转期间不会破坏和重新创建自己。然而，事实并非如此。onActivityCreated每次我执行旋转时它仍然会调用。

WatchlistFragment.java

package org.yccheok.jstock.gui;

import android.os.Bundle;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;

import com.actionbarsherlock.app.SherlockFragment;
import com.actionbarsherlock.app.SherlockListFragment;

public class WatchlistFragment extends SherlockListFragment {
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        Log.i(TAG, "WatchlistFragment onCreate");
    }

    @Override
    public void onActivityCreated(Bundle savedInstanceState) {
        super.onActivityCreated(savedInstanceState);
        Log.i(TAG, "WatchlistFragment onActivityCreated");

        // Not sure why. After I setRetainInstance to true, onActivityCreated is still
        // called for each screen rotation changes.
        setRetainInstance(true);

        setListAdapter(new ArrayAdapter<String>(getActivity(), android.R.layout.simple_list_item_1, getTimeConsumingData()));
    }

    public String[] getTimeConsumingData() {
        Log.i(TAG, "WatchlistFragment getTimeConsumingData");
        return new String[] { "A", "B", "C"};
    }

    private static final String TAG = WatchlistFragment.class.getSimpleName();
}

JStockFragmentActivity.java

package org.yccheok.jstock.gui;

import android.os.Bundle;
import android.util.Log;

import com.actionbarsherlock.app.SherlockFragmentActivity;

public class JStockFragmentActivity extends SherlockFragmentActivity {
    @Override
    public void onCreate(Bundle savedInstanceState) {
        Log.i(TAG, "JStockFragmentActivity onCreate");
        super.onCreate(savedInstanceState);     
        setContentView(R.layout.jstock_fragment_activity);
    }

    private static final String TAG = JStockFragmentActivity.class.getSimpleName();
}

jstock_fragment_activity.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical" >

    <fragment class="org.yccheok.jstock.gui.WatchlistFragment"
        android:layout_width="match_parent"
        android:layout_height="match_parent" />

</LinearLayout>

每次轮换我都会得到以下 logcat

02-25 20:11:10.562: I/JStockFragmentActivity(6989): JStockFragmentActivity onCreate
02-25 20:11:10.597: I/WatchlistFragment(6989): WatchlistFragment onCreate
02-25 20:11:10.613: I/WatchlistFragment(6989): WatchlistFragment onActivityCreated
02-25 20:11:10.613: I/WatchlistFragment(6989): WatchlistFragment getTimeConsumingData
02-25 20:11:12.078: I/JStockFragmentActivity(6989): JStockFragmentActivity onCreate
02-25 20:11:12.109: I/WatchlistFragment(6989): WatchlistFragment onCreate
02-25 20:11:12.121: I/WatchlistFragment(6989): WatchlistFragment onActivityCreated
02-25 20:11:12.121: I/WatchlistFragment(6989): WatchlistFragment getTimeConsumingData
02-25 20:11:17.492: I/JStockFragmentActivity(6989): JStockFragmentActivity onCreate
02-25 20:11:17.519: I/WatchlistFragment(6989): WatchlistFragment onCreate
02-25 20:11:17.527: I/WatchlistFragment(6989): WatchlistFragment onActivityCreated
02-25 20:11:17.527: I/WatchlistFragment(6989): WatchlistFragment getTimeConsumingData

我想有没有应该在轮换期间一次又一次地setRetainInstance(true)创造？WatchlistFragment

4

2 回答 2

0

这是对规格的正确编码：

  • onDestroy()不会被调用（但onDetach()仍然会被调用，因为片段正在与其当前活动分离）。
  • onCreate(Bundle)不会被调用，因为片段没有被重新创建。
  • onAttach(Activity)并且onActivityCreated(Bundle)仍然会被调用。
于 2013-02-25T12:08:52.740 回答
0

是的，它调用onActivityCreated()但它不调用onCreate()and onCreateView()。因此，将您不想被再次调用的代码移动到onCreate().

于 2013-02-25T12:09:34.230 回答