android - SupportMapFragment 在方向更改时重新创建

Question

我正在创建一个简单的应用程序，它在选项卡中使用谷歌地图，在其他选项卡中使用其他内容。问题是当我改变方向时 map 会重新创建，所以我转到 latlng 0,0

这是我的代码

MainAcitivy.java

private static final String MAP_FRAGMENT_TAG = "map";
private static final String DUMMY_FRAGMENT_TAG = "DUMMY";

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    // Set up the action bar to show tabs.
    final ActionBar actionBar = getSupportActionBar();
    actionBar.setNavigationMode(ActionBar.NAVIGATION_MODE_TABS);
    //
    // // For each of the sections in the app, add a tab to the action bar.
    actionBar.addTab(actionBar
        .newTab()
            .setText(R.string.title_section1)
                .setTabListener(
                    new TabListener<SupportMapFragment>(this,
                        MAP_FRAGMENT_TAG, SupportMapFragment.class)));
    actionBar
        .addTab(actionBar
            .newTab()
                .setText(R.string.title_section2)
                    .setTabListener(
                        new TabListener<DummySectionFragment>(this,
                            DUMMY_FRAGMENT_TAG,
                                DummySectionFragment.class)));

}

TabListener.java

public class TabListener<T extends Fragment> implements ActionBar.TabListener {
    private Fragment mFragment;
    private final SherlockFragmentActivity mActivity;
    private final String mTag;
    private final Class<T> mClass;

    public TabListener(SherlockFragmentActivity activity, String tag,
    Class<T> clz) {
        mActivity = activity;
        mTag = tag;
        mClass = clz;
    }

    /* The following are each of the ActionBar.TabListener callbacks */

    public void onTabSelected(Tab tab, FragmentTransaction ft) {
        if (mFragment == null) {
            mFragment = mActivity.getSupportFragmentManager()
                .findFragmentByTag(mTag);
        }
        if (mFragment == null) {
            mFragment = Fragment.instantiate(mActivity, mClass.getName());
            ft.add(android.R.id.content, mFragment, mTag);
        } else {
            ft.attach(mFragment);
        }
    }

    public void onTabUnselected(Tab tab, FragmentTransaction ft) {
        if (mFragment != null) {
            ft.detach(mFragment);
        }
    }

    public void onTabReselected(Tab tab, FragmentTransaction ft) {
    }
}

Answer 1

使用

setRetainInstance(true);

在 MapFragment 的 onCreate 方法中