在Google地图上搜索时出现NullPointer或InflateException

Question

我是初学者，我正在尝试使用Google Maps Api V2 +片段+动作栏进行实验，但我想我在这里碰壁了。此应用程序的purpouse非常简单，您可以从片段上的edittext或操作栏中的edittext键入位置，然后当您点击搜索时，应用程序会在所需位置显示带有标记的地图。如果我键入搜索并按下按钮，则会出现以下错误：

 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)

只有在地图已经显示时才有效，但如果我更改标签并返回或再次搜索，我会得到一个膨胀异常：

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;
    }

}

fragsearch.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>

提前谢谢大家！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nullpointer是给出的，因为它必须在访问locateSearch方法之前进行实例化，所以我想我必须找到一种方法来传递文本作为参数并且一旦被实例化就被定位，但是对于InflateExceptio，看起来我将不得不找到另一种方式来膨胀该片段的视图，因为TabListener是我在其他应用程序上使用的没有问题的常规碎片。有什么想法吗？

Answer 1

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

对于您的第一组错误，您在Button的OnClickListener中有一个空值。我猜它是fb，因为我看不到你给任何片段标记"Prestamo"的位置。但是从LogCat说明的第32行开始。

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

发生第二组错误，因为每次单击选项卡时都要创建现有Fragment的新副本。 （因此重复的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tutorial来帮助。

Answer 2

最后我将IllegalArgumentException排除在外。在做了一些研究后，我最后改变了一点我的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，它似乎抛出了异常，因为我试图在实例化该对象之前访问方法，所以我似乎必须尝试为此找到解决方法。