Monday, March 3, 2014

android listview error Press


android listview pointer debug
Will Daniel, now has his own encounter a problem, get yourself an example of a contact's listview, but the press, then the error, first put the code, 
 
public class ListviewtestActivity extends Activity 
@ Override 
protected void onCreate (Bundle savedInstanceState) {
super.onCreate (savedInstanceState); 
setContentView (R.layout.activity_listviewtest); 
final List > 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  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  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, "add"); 
menu.add (0, 1, 0, "delete"); 
menu.add (0, 2, 0, "Delete 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; 
} 
}); 
}

Press the error log, reporting null pointer error 
 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)

Please tell brother Daniel in the end is where the problem that way for a long time will not own debugging<-! Main posts under Banner (D4) -><-! Posts under the main text (D5) ->
Reply:
Reply own right, resolved, because the property is set listview inside a multiple-selection android: choiceMode = "multipleChoiceModal"
But he is still not sure why it went wrong
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