無法啓動活動Android

當我嘗試啓動此活動時，我有一個NPE。此活動工作正常，直到我嘗試添加導航抽屜。我沒有設法找到如何一起完成這項工作。我把bellow我的創建方法。此活動使用Json解析和抽屜菜單顯示列表視圖以訪問其他活動。無法啓動活動Android

我的代碼：

public class FavoritesActivity extends Activity { 


private DrawerLayout mDrawerLayout; 
private ListView mDrawerList; 
private ActionBarDrawerToggle mDrawerToggle; 

// nav drawer title 
private CharSequence mDrawerTitle; 

// used to store app title 
private CharSequence mTitle; 

// slide menu items 
private String[] navMenuTitles; 
private TypedArray navMenuIcons; 

private ArrayList<NavDrawerItem> navDrawerItems; 
private NavDrawerListAdapter adapter; 

private ProgressDialog pDialog; 

private static String mylat; 
private static String mylng; 

// URL to get JSON 

private static String url2 = "http://apiurl"; 

// JSON Node names 
private static final String TAG_NAME = "shop_name"; 
private static final String TAG_ADDRESS_STRING = "shop_address"; 
private static final String TAG_URL = "shop_url"; 
private static final String TAG_BOOKLET_URL = "feuilletez"; 
TextView shop_address; 
TextView shop_name; 
TextView shop_url; 
private LocationManager locMan; 
ImageButton feuilletez; 
private ListView list; 

private String latitude; 
private String longitude; 


ArrayList<String>shoplatitude; 
ArrayList<String>shoplongitude; 
ArrayList<String>shopname; 
ArrayList<String>shopaddress; 
ArrayList<String>shopurl; 

// Hashmap for ListView 
ArrayList<HashMap<String, String>> oslist = new ArrayList<HashMap<String, String>>(); 

@Override 
public void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 


    setContentView(R.layout.activity_favorites); 

    mTitle = mDrawerTitle = getTitle(); 

    // load slide menu items 
    navMenuTitles = getResources().getStringArray(R.array.nav_drawer_items); 

    // nav drawer icons from resources 
    navMenuIcons = getResources() 
      .obtainTypedArray(R.array.nav_drawer_icons); 

    mDrawerLayout = (DrawerLayout) findViewById(R.id.drawer_layout); 
    mDrawerList = (ListView) findViewById(R.id.list_slidermenu); 

    navDrawerItems = new ArrayList<NavDrawerItem>(); 

    // adding nav drawer items to array 
    navDrawerItems.add(new NavDrawerItem(navMenuTitles[0], navMenuIcons.getResourceId(0, -1))); 

    navDrawerItems.add(new NavDrawerItem(navMenuTitles[1], navMenuIcons.getResourceId(1, -1))); 

    navDrawerItems.add(new NavDrawerItem(navMenuTitles[2], navMenuIcons.getResourceId(2, -1))); 

    navDrawerItems.add(new NavDrawerItem(navMenuTitles[3], navMenuIcons.getResourceId(3, -1))); 

    navDrawerItems.add(new NavDrawerItem(navMenuTitles[4], navMenuIcons.getResourceId(4, -1))); 

    navDrawerItems.add(new NavDrawerItem(navMenuTitles[5], navMenuIcons.getResourceId(5, -1))); 

    navDrawerItems.add(new NavDrawerItem(navMenuTitles[6], navMenuIcons.getResourceId(6, -1), true, "3")); 

    navDrawerItems.add(new NavDrawerItem(navMenuTitles[7], navMenuIcons.getResourceId(7, -1))); 

    navDrawerItems.add(new NavDrawerItem(navMenuTitles[8], navMenuIcons.getResourceId(8, -1))); 

    navDrawerItems.add(new NavDrawerItem(navMenuTitles[9], navMenuIcons.getResourceId(9, -1))); 


    // Recycle the typed array 
    navMenuIcons.recycle(); 

    mDrawerList.setOnItemClickListener(new SlideMenuClickListener()); 

    // setting the nav drawer list adapter 
    adapter = new NavDrawerListAdapter(getApplicationContext(), 
      navDrawerItems); 
    mDrawerList.setAdapter(adapter); 

    // enabling action bar app icon and behaving it as toggle button 
    getActionBar().setDisplayHomeAsUpEnabled(true); 
    getActionBar().setHomeButtonEnabled(true); 

    // Calling async task to get json 
    new GetJson().execute(); 

    mDrawerToggle = new ActionBarDrawerToggle(this, mDrawerLayout, 
      R.drawable.ic_drawer, //nav menu toggle icon 
      R.string.app_name, // nav drawer open - description for accessibility 
      R.string.app_name // nav drawer close - description for accessibility 
    ) { 
     public void onDrawerClosed(View view) { 
      getActionBar().setTitle(mTitle); 
      // calling onPrepareOptionsMenu() to show action bar icons 
      invalidateOptionsMenu(); 
     } 

     public void onDrawerOpened(View drawerView) { 
      getActionBar().setTitle(mDrawerTitle); 
      // calling onPrepareOptionsMenu() to hide action bar icons 
      invalidateOptionsMenu(); 
     } 
    }; 

    mDrawerLayout.setDrawerListener(mDrawerToggle); 

    if (savedInstanceState == null) { 
     // on first time display view for first nav item 
     displayView(1); 
    } 
} 

/** 
* Slide menu item click listener 
* */ 
public class SlideMenuClickListener implements 
     ListView.OnItemClickListener { 
    @Override 
    public void onItemClick(AdapterView<?> parent, View view, int position, 
      long id) { 
     // display view for selected nav drawer item 
     displayView(position); 

    } 





} 

/** 
* Async task class to get json by making HTTP call 
* */ 
private class GetJson extends AsyncTask<Void, Void, Void> {

...

的logcat：

01-29 10:00:29.573: E/AndroidRuntime(6923): FATAL EXCEPTION: main 
01-29 10:00:29.573: E/AndroidRuntime(6923): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.begital.vitalis/com.begital.vitalis.FavoritesActivity}: java.lang.NullPointerException 
01-29 10:00:29.573: E/AndroidRuntime(6923):  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2059) 
01-29 10:00:29.573: E/AndroidRuntime(6923):  at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2084) 
01-29 10:00:29.573: E/AndroidRuntime(6923):  at android.app.ActivityThread.access$600(ActivityThread.java:130) 
01-29 10:00:29.573: E/AndroidRuntime(6923):  at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1195) 
01-29 10:00:29.573: E/AndroidRuntime(6923):  at android.os.Handler.dispatchMessage(Handler.java:99) 
01-29 10:00:29.573: E/AndroidRuntime(6923):  at android.os.Looper.loop(Looper.java:137) 
01-29 10:00:29.573: E/AndroidRuntime(6923):  at android.app.ActivityThread.main(ActivityThread.java:4745) 
01-29 10:00:29.573: E/AndroidRuntime(6923):  at java.lang.reflect.Method.invokeNative(Native Method) 
01-29 10:00:29.573: E/AndroidRuntime(6923):  at java.lang.reflect.Method.invoke(Method.java:511) 
01-29 10:00:29.573: E/AndroidRuntime(6923):  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:786) 
01-29 10:00:29.573: E/AndroidRuntime(6923):  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553) 
01-29 10:00:29.573: E/AndroidRuntime(6923):  at dalvik.system.NativeStart.main(Native Method) 
01-29 10:00:29.573: E/AndroidRuntime(6923): Caused by: java.lang.NullPointerException 
01-29 10:00:29.573: E/AndroidRuntime(6923):  at com.begital.vitalis.FavoritesActivity.onCreate(FavoritesActivity.java:145) 
01-29 10:00:29.573: E/AndroidRuntime(6923):  at android.app.Activity.performCreate(Activity.java:5008) 
01-29 10:00:29.573: E/AndroidRuntime(6923):  at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1079) 
01-29 10:00:29.573: E/AndroidRuntime(6923):  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2023) 
01-29 10:00:29.573: E/AndroidRuntime(6923):  ... 11 more

來源

2014-01-29 Xavier

張貼您的logcat –

我剛添加它。 – Xavier

@Xavier 145線是什麼？ –

聲明你

mDrawerList.setOnItemClickListener(new SlideMenuClickListener());

後

mDrawerList.setAdapter(adapter);

這樣的：

mDrawerList.setAdapter(adapter); 
mDrawerList.setOnItemClickListener(new SlideMenuClickListener());

不要在onItemClick以前setAdapter聲明。

來源

2014-01-29 09:24:19

Stil NPE。不工作。 – Xavier

NPE在線號碼和代碼？ –

看清潔項目是否有效？ –

無法啓動活動Android

回答

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