android listview长按报错

public class ListviewtestActivity extends Activity 

	@Override

	protected void onCreate(Bundle savedInstanceState) {

		super.onCreate(savedInstanceState);

		setContentView(R.layout.activity_listviewtest);

		final List<Map<String, Object>> listItems=get_contacts(ListviewtestActivity.this);

	    BaseAdapter baseAdapter=new BaseAdapter() {

			

			@Override

			public View getView(int position, View convertView, ViewGroup parent) {

				// TODO Auto-generated method stub

				

				Map<String, Object> map=listItems.get(position);		

				LinearLayout linearLayout=new LinearLayout(ListviewtestActivity.this);

				linearLayout.setOrientation(0);

				

				LinearLayout linearLayout_t=new LinearLayout(ListviewtestActivity.this);

				linearLayout_t.setOrientation(1);

				TextView nameTextView=new TextView(ListviewtestActivity.this);

				nameTextView.setTextSize(20);

				nameTextView.setTextColor(Color.RED);

				TextView numberTextView=new TextView(ListviewtestActivity.this);

				numberTextView.setTextSize(15);

				numberTextView.setTextColor(Color.BLUE);

				linearLayout_t.addView(nameTextView);

				linearLayout_t.addView(numberTextView);

				

				LinearLayout linearLayout_c=new LinearLayout(ListviewtestActivity.this);

				linearLayout_c.setGravity(0x05);

				CheckBox selectCheckBox=new CheckBox(ListviewtestActivity.this);

				selectCheckBox.setClickable(false);

				selectCheckBox.setFocusable(false);

				selectCheckBox.setFocusableInTouchMode(false);

				linearLayout_c.addView(selectCheckBox);

				

				linearLayout.addView(linearLayout_t);

				linearLayout.addView(linearLayout_c);

				

				nameTextView.setText(map.get("name").toString());

				numberTextView.setText(map.get("number").toString());

				if (map.get("selected").toString().equals("0")) {

					selectCheckBox.setChecked(false);

				} else {

					selectCheckBox.setChecked(true);

				}

				Log.v("caicai", "getView_");

				return linearLayout;

			}

			

			@Override

			public long getItemId(int position) {

				// TODO Auto-generated method stub

				Log.v("caicai", "getItemId"+position);

				return position;

			}

			

			@Override

			public Object getItem(int position) {

				// TODO Auto-generated method stub

				Log.v("caicai", "getItem");

				return listItems.get(position);

			}

			

			@Override

			public int getCount() {

				// TODO Auto-generated method stub

				Log.v("caicai", "getCount"+listItems.size());

				return listItems.size();

			}

		};	

		ListView listView=(ListView)findViewById(R.id.listview_select_contact_test);

		listView.setAdapter(baseAdapter);	

		/*

		listView.setOnItemClickListener(new OnItemClickListener() {

			@Override

			public void onItemClick(AdapterView<?> parent, View view, int pasition, long id)

			{

				Map<String, Object> map=listItems.get(pasition);

				Log.v("caicai", map.get("name").toString());

						

			}

		});



		listView.setOnCreateContextMenuListener(new OnCreateContextMenuListener() {

                     

                    public void onCreateContextMenu(ContextMenu menu, View v,

                    		ContextMenu.ContextMenuInfo menuInfo) {

                    	   Log.v("caicai","setOnItemLongClickListener");

                    	       menu.add(0, 0, 0, "添加");

                                menu.add(0, 1, 0, "删除");

                                menu.add(0, 2, 0, "删除ALL");

                    }

         });*/

         listView.setOnItemLongClickListener(new OnItemLongClickListener() {

			@Override

			public boolean onItemLongClick(AdapterView<?> arg0,

					View arg1, int arg2, long arg3) {

				// TODO Auto-generated method stub

				Log.v("caicai", "setOnItemLongClickListener");

				return false;

			}

		});

	}

FATAL EXCEPTION: main

java.lang.NullPointerException

at com.android.internal.policy.impl.PhoneWindow$DecorView$ActionModeCallbackWrapper.onCreateActionMode(PhoneWindow.java:2709)

at com.android.internal.app.ActionBarImpl$ActionModeImpl.dispatchOnCreate(ActionBarImpl.java:945)

at com.android.internal.app.ActionBarImpl.startActionMode(ActionBarImpl.java:515)

at android.app.Activity.onWindowStartingActionMode(Activity.java:4962)

at com.android.internal.policy.impl.PhoneWindow$DecorView.startActionMode(PhoneWindow.java:2414)

at com.android.internal.policy.impl.PhoneWindow$DecorView.startActionModeForChild(PhoneWindow.java:2401)

at android.view.ViewGroup.startActionModeForChild(ViewGroup.java:654)

at android.view.ViewGroup.startActionModeForChild(ViewGroup.java:654)

at android.view.ViewGroup.startActionModeForChild(ViewGroup.java:654)

at android.view.View.startActionMode(View.java:4381)

at android.widget.AbsListView.performLongPress(AbsListView.java:2832)

at android.widget.AbsListView$CheckForLongPress.run(AbsListView.java:2792)

at android.os.Handler.handleCallback(Handler.java:725)

at android.os.Handler.dispatchMessage(Handler.java:92)

at android.os.Looper.loop(Looper.java:137)

at android.app.ActivityThread.main(ActivityThread.java:5199)

at java.lang.reflect.Method.invokeNative(Native Method)

at java.lang.reflect.Method.invoke(Method.java:511)

at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:797)

at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:564)

at dalvik.system.NativeStart.main(Native Method)