无法启动活动Android
当我尝试启动此活动时,我有一个NPE。在我尝试添加导航抽屉之前,此活动工作正常。我没有设法找到如何把这项工作结合起来。 我把我的Oncreate方法放在下面。此活动显示一个带有Json解析的列表视图和一个抽屉菜单,用于访问其他活动 我的代码:无法启动活动Android,android,oncreate,Android,Oncreate,当我尝试启动此活动时,我有一个NPE。在我尝试添加导航抽屉之前,此活动工作正常。我没有设法找到如何把这项工作结合起来。 我把我的Oncreate方法放在下面。此活动显示一个带有Json解析的列表视图和一个抽屉菜单,用于访问其他活动 我的代码: public class FavoritesActivity extends Activity { private DrawerLayout mDrawerLayout; private ListView mDrawerList; private Ac
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> {
申报你的
mDrawerList.setOnItemClickListener(new SlideMenuClickListener());
之后
mDrawerList.setAdapter(adapter);
像这样:
mDrawerList.setAdapter(adapter);
mDrawerList.setOnItemClickListener(new SlideMenuClickListener());
请勿在发布您的logcat@Xavier第145行是什么?mDrawerList.setOnItemClickListener(新的SlideMenuClickListener());似乎没有名为list\u slidermenu的资源。mDrawerList似乎为空。清理后仍然没有。01-29 10:41:01.723:E/AndroidRuntime(8291):由以下原因引起:java.lang.NullPointerException 01-29 10:41:01.723:E/AndroidRuntime(8291):位于com.begital.vitalis.FavoritesActivity.onCreate(FavoritesActivity.java:150)150:mDrawerList.setAdapter(adapter);让我们一起去吧,我来了!!!!我把我所有的东西都放在碎片里了,就像你说的,一切都正常!比我想象的要容易!非常感谢你!
mDrawerList.setAdapter(adapter);
mDrawerList.setOnItemClickListener(new SlideMenuClickListener());