0

我是初学者，目前正在尝试使用 Google Maps Api V2+fragments+actionbar 进行实验，但我想我在这里碰壁了。这个应用程序的目的非常简单，您可以从片段上的编辑文本或操作栏的编辑文本中键入位置，然后当您点击搜索时，应用程序会在所需位置上显示带有标记的地图。如果我输入搜索并点击按钮，我会收到以下错误：

 01-10 17:29:06.560: E/AndroidRuntime(17425): FATAL EXCEPTION: main
01-10 17:29:06.560: E/AndroidRuntime(17425): java.lang.NullPointerException
01-10 17:29:06.560: E/AndroidRuntime(17425):    at alan.android.testMapas.FragOne$1.onClick(FragOne.java:32)
01-10 17:29:06.560: E/AndroidRuntime(17425):    at android.view.View.performClick(View.java:3574)
01-10 17:29:06.560: E/AndroidRuntime(17425):    at android.view.View$PerformClick.run(View.java:14293)
01-10 17:29:06.560: E/AndroidRuntime(17425):    at android.os.Handler.handleCallback(Handler.java:605)
01-10 17:29:06.560: E/AndroidRuntime(17425):    at android.os.Handler.dispatchMessage(Handler.java:92)
01-10 17:29:06.560: E/AndroidRuntime(17425):    at android.os.Looper.loop(Looper.java:137)
01-10 17:29:06.560: E/AndroidRuntime(17425):    at android.app.ActivityThread.main(ActivityThread.java:4441)
01-10 17:29:06.560: E/AndroidRuntime(17425):    at java.lang.reflect.Method.invokeNative(Native Method)
01-10 17:29:06.560: E/AndroidRuntime(17425):    at java.lang.reflect.Method.invoke(Method.java:511)
01-10 17:29:06.560: E/AndroidRuntime(17425):    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:823)
01-10 17:29:06.560: E/AndroidRuntime(17425):    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:590)
01-10 17:29:06.560: E/AndroidRuntime(17425):    at dalvik.system.NativeStart.main(Native Method)

它仅在地图已经显示时才有效，但如果我更改选项卡并返回或再次搜索，我会得到一个 inflate 异常：

01-10 17:32:26.080: E/AndroidRuntime(17681): FATAL EXCEPTION: main
01-10 17:32:26.080: E/AndroidRuntime(17681): android.view.InflateException: Binary XML file line #2: Error inflating class fragment
01-10 17:32:26.080: E/AndroidRuntime(17681):    at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:697)
01-10 17:32:26.080: E/AndroidRuntime(17681):    at android.view.LayoutInflater.inflate(LayoutInflater.java:466)
01-10 17:32:26.080: E/AndroidRuntime(17681):    at android.view.LayoutInflater.inflate(LayoutInflater.java:396)
01-10 17:32:26.080: E/AndroidRuntime(17681):    at alan.android.testMapas.FragSearch.onCreateView(FragSearch.java:35)
01-10 17:32:26.080: E/AndroidRuntime(17681):    at android.support.v4.app.Fragment.performCreateView(Fragment.java:1460)
01-10 17:32:26.080: E/AndroidRuntime(17681):    at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:911)
01-10 17:32:26.080: E/AndroidRuntime(17681):    at android.support.v4.app.FragmentManagerImpl.attachFragment(FragmentManager.java:1264)
01-10 17:32:26.080: E/AndroidRuntime(17681):    at android.support.v4.app.BackStackRecord.run(BackStackRecord.java:672)
01-10 17:32:26.080: E/AndroidRuntime(17681):    at android.support.v4.app.FragmentManagerImpl.execPendingActions(FragmentManager.java:1444)
01-10 17:32:26.080: E/AndroidRuntime(17681):    at android.support.v4.app.FragmentManagerImpl$1.run(FragmentManager.java:429)
01-10 17:32:26.080: E/AndroidRuntime(17681):    at android.os.Handler.handleCallback(Handler.java:605)
01-10 17:32:26.080: E/AndroidRuntime(17681):    at android.os.Handler.dispatchMessage(Handler.java:92)
01-10 17:32:26.080: E/AndroidRuntime(17681):    at android.os.Looper.loop(Looper.java:137)
01-10 17:32:26.080: E/AndroidRuntime(17681):    at android.app.ActivityThread.main(ActivityThread.java:4441)
01-10 17:32:26.080: E/AndroidRuntime(17681):    at java.lang.reflect.Method.invokeNative(Native Method)
01-10 17:32:26.080: E/AndroidRuntime(17681):    at java.lang.reflect.Method.invoke(Method.java:511)
01-10 17:32:26.080: E/AndroidRuntime(17681):    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:823)
01-10 17:32:26.080: E/AndroidRuntime(17681):    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:590)
01-10 17:32:26.080: E/AndroidRuntime(17681):    at dalvik.system.NativeStart.main(Native Method)
01-10 17:32:26.080: E/AndroidRuntime(17681): Caused by: java.lang.IllegalArgumentException: Binary XML file line #2: Duplicate id 0x7f040036, tag null, or parent id 0x0 with another fragment for com.google.android.gms.maps.SupportMapFragment
01-10 17:32:26.080: E/AndroidRuntime(17681):    at android.support.v4.app.FragmentActivity.onCreateView(FragmentActivity.java:285)
01-10 17:32:26.080: E/AndroidRuntime(17681):    at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:669)
01-10 17:32:26.080: E/AndroidRuntime(17681):    ... 18 more

以下是主要活动：

public class MainActivity extends SherlockFragmentActivity {

    public ActionBar bar;
    private EditText txtsearch;




    // private

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        bar = getSupportActionBar();
        //mTabSeeker=new TabSeeker(bar);
        bar.setNavigationMode(ActionBar.NAVIGATION_MODE_TABS);
        bar.setDisplayShowTitleEnabled(false);

        Tab tab0 = bar
                .newTab()
                .setText("1")
                .setTabListener(
                        new SherlockTabListener<FragOne>(this, "One",
                                FragOne.class));
        bar.addTab(tab0);

        Tab tab1 = bar
                .newTab()
                .setText("2")
                .setTabListener(
                        new SherlockTabListener<FragSearch>(this, "Search",
                                FragSearch.class));
        bar.addTab(tab1);


    }




    @Override
    public boolean onCreateOptionsMenu(Menu menu) {

        MenuInflater inflater = getSupportMenuInflater();
        inflater.inflate(R.menu.activity_main, (Menu)menu);

        View v = (View)menu.findItem(R.id.searchoption).getActionView();

        txtsearch = (EditText)v.findViewById(R.id.txt_search);

        txtsearch.setOnEditorActionListener(new EditText.OnEditorActionListener() {

            @Override
            public boolean onEditorAction(TextView v, int actionId, KeyEvent event) {
                // TODO Auto-generated method stub
                FragSearch fs;
                bar.setSelectedNavigationItem(1);

                fs = (FragSearch) getSupportFragmentManager().findFragmentByTag("Search");
                fs.locateSearch(txtsearch.getText().toString());

                return false;
            }
        });

        return super.onCreateOptionsMenu(menu);
    }

搜索片段

public class FragSearch extends SherlockFragment{

    private CameraUpdate camUpd1;
    private GoogleMap map;
    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
            Bundle savedInstanceState) {
        // TODO Auto-generated method stub

        View view = inflater.inflate(R.layout.fragsearch,container,false);
        map = ((SupportMapFragment)getSherlockActivity().getSupportFragmentManager().findFragmentById(R.id.map)).getMap();

        map.setMapType(GoogleMap.MAP_TYPE_NORMAL);


        return view;
    }

    public void locateSearch(String text){
        Geocoder geocoder = new Geocoder(getActivity(),Locale.getDefault());
        try {
            List<Address>list= geocoder.getFromLocationName(text, 1);
            if(list!=null){
            Double lat=(Double) list.get(0).getLatitude();
            Double lng=(Double)list.get(0).getLongitude();
            LatLng ubicacion = new LatLng(lat,lng);
            CameraPosition camUpd1=new CameraPosition.Builder().target(ubicacion).zoom(16).build();
            CameraUpdate camUpd3 = CameraUpdateFactory.newCameraPosition(camUpd1);
            map.clear();

            map.addMarker(new MarkerOptions().position(new LatLng(lat,lng)).title(text));

            map.animateCamera(camUpd3);
            }else{

            }
        } catch (Exception e) {
            // TODO Auto-generated catch block
            Toast.makeText(getSherlockActivity(), "Search Error", Toast.LENGTH_SHORT).show();
            e.printStackTrace();
        }
    }
}

FragOne.java

    public class FragOne extends SherlockFragment {
    private EditText et;

    public View onCreateView(LayoutInflater inflater, ViewGroup container,
            Bundle savedInstanceState) {
        // TODO Auto-generated method stub

        View view = inflater.inflate(R.layout.fragone, container, false);

        et = (EditText) view.findViewById(R.id.editText1);
        Button bt = (Button) view.findViewById(R.id.button1);

        bt.setOnClickListener(new View.OnClickListener() {

            @Override
            public void onClick(View v) {
                // TODO Auto-generated method stub
                FragSearch fb;
                String text;
                text = et.getText().toString();
                fb = (FragSearch) getSherlockActivity()
                        .getSupportFragmentManager()
                        .findFragmentByTag("Search");
                fb.locateSearch(text);
            }
        });

        return view;
    }

}

碎片搜索.xml

<?xml version="1.0" encoding="utf-8"?>
<fragment xmlns:android="http://schemas.android.com/apk/res/android"
        android:id="@+id/map"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        class="com.google.android.gms.maps.SupportMapFragment"/>

和 search.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="horizontal" >

    <EditText
        style="@style/Theme.Sherlock.Light.Dialog"
        android:id="@+id/txt_search"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:layout_weight="0.67"

        android:inputType="text" />

</LinearLayout>

谢谢大家！如果需要我发布项目中的任何内容，请告诉我。

编辑：我已经更新了两个日志，我认为给出了 nullpointer，因为它必须在访问 locateSearch 方法之前被实例化，所以我认为我必须找到一种方法将文本作为参数传递并定位它有已实例化，但至于 InflateExceptioin 看起来我将不得不找到另一种方法来扩展该片段的视图，因为 TabListener 是我在其他应用程序上使用的，没有关于常规片段的问题。有任何想法吗？

4

2 回答 2

2 
java.lang.NullPointerException
    at alan.android.testMapas.FragOne$1.onClick(FragOne.java:32)

对于您的第一组错误，您的 Button 的 OnClickListener 中有一个空值。我猜是fb因为我看不到你在哪里给任何 Fragment 标签"Prestamo"。但从第 32 行开始，如 LogCat 所述。

Caused by: java.lang.IllegalArgumentException: Binary XML file line #2: Duplicate id 0x7f040036, tag null, or parent id 0x0 with another fragment for com.google.android.gms.maps.SupportMapFragment

第二组错误发生是因为每次单击选项卡时都会创建现有片段的新副本。（因此出现重复的 id 错误。）您的 TabListener 应该重新加载已经存在的片段。这是一个简单的教程来帮助。

于 2013-01-09T21:14:40.397 回答
1

最后我把 IllegalArgumentException 排除在外。在做了一些研究之后，我最终改变了我的 OnCreateView() 并扩展了 SupportMapFragment 而不是 SherlockFragment。这是代码：

public class FragSearch extends SupportMapFragment {

    private GoogleMap map;

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
            Bundle savedInstanceState) {

        View view = super.onCreateView(inflater, container, savedInstanceState);
        map = getMap();
        map.setMapType(GoogleMap.MAP_TYPE_NORMAL);

        return view;
    }

    public void locateSearch(String text) {
        Geocoder geocoder = new Geocoder(getActivity(), Locale.getDefault());
        try {
            List<Address> list = geocoder.getFromLocationName(text, 1);
            if (list != null) {
                Double lat = (Double) list.get(0).getLatitude();
                Double lng = (Double) list.get(0).getLongitude();
                LatLng ubicacion = new LatLng(lat, lng);
                CameraPosition camUpd1 = new CameraPosition.Builder()
                        .target(ubicacion).zoom(16).build();
                CameraUpdate camUpd3 = CameraUpdateFactory
                        .newCameraPosition(camUpd1);
                map.clear();

                map.addMarker(new MarkerOptions()
                        .position(new LatLng(lat, lng)).title(text));

                map.animateCamera(camUpd3);
            } else {

            }
        } catch (Exception e) {
            Toast.makeText(getActivity(), "Search Error", Toast.LENGTH_SHORT)
                    .show();
            e.printStackTrace();
        }
    }
}

至于 NPE，似乎它抛出了那个异常，因为我试图在实例化该对象之前访问方法，所以看来我必须尝试找到解决方法。

于 2013-01-10T18:08:33.567 回答