自定义listview在自定义alertdialog中崩溃

我的问题是什么？我正试图在对话中创建一个自定义适配器。我不明白错误的原因是什么。自定义listview在自定义alertdialog中崩溃

创建对话框：

protected Dialog onCreateDialog(int id) { 
    AlertDialog.Builder adb = new AlertDialog.Builder(this); 
    adb.setTitle("Choose contact"); 

    view = (LinearLayout) getLayoutInflater().inflate(R.layout.dialog, null); 
    adb.setView(view); 

    deditText = (EditText) view.findViewById(R.id.deditText); 
    deditText.addTextChangedListener(this); 
    dlvNames = (ListView) view.findViewById(R.id.dlvCheck); 

    Cursor cursor = getContentResolver().query(
      ContactsContract.CommonDataKinds.Phone.CONTENT_URI, 
      new String[] { Phone._ID, Phone.DISPLAY_NAME, Phone.NUMBER }, 
      null, null, null); 

     startManagingCursor(cursor); 


    while (cursor.moveToNext()) { 
     ID=i; 
     CID=Long.valueOf(cursor.getString(0)); 
     NAME=cursor.getString(1); 
     PHONE=cursor.getString(2); 

     Contact_List.add(new Contact(ID,CID,NAME,PHONE)); 

     i++; 
    } 

    contactAdapter = new ContactAdapter(this,Contact_List); 
    //crashes here 
    dlvNames.setAdapter(contactAdapter); 

    dialog = adb.create(); 
    return dialog; 
}

创建自定义适配器：

public class ContactAdapter extends ArrayAdapter<Contact> { 

private final Activity context; 
ArrayList<Contact> Contact_List; 
LayoutInflater lInflater; 


static class ViewHolder { 
     public TextView tvName; 
     public TextView tvPhone; 

    } 
public ContactAdapter(Activity context, ArrayList<Contact> Contact_List) { 

    super(context, R.layout.item, Contact_List); 
    this.context = context; 
    this.Contact_List = Contact_List; 
} 

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

    ViewHolder holder; 
    View view = convertView; 

    if (view == null) { 
     LayoutInflater inflater = context.getLayoutInflater(); 

     //view = lInflater.inflate(R.layout.item, parent, false); 

     view = inflater.inflate(R.layout.item, null, true); 

     holder = new ViewHolder(); 
     holder.tvName = (TextView) view.findViewById(R.id.tvName); 
     holder.tvPhone = (TextView) view.findViewById(R.id.tvPhone); 
     convertView.setTag(holder); 
    } else { 
     holder = (ViewHolder) view.getTag(); 
    } 

    Contact c = getContact(position); 

    holder.tvName.setText(c.name); 
    holder.tvPhone.setText(c.phone); 


    return view; 
} 
    Contact getContact(int position) { 
     return ((Contact) getItem(position)); 
     } 
}

logcat的：

01-17 06:40:31.801: E/AndroidRuntime(1263): FATAL EXCEPTION: main 
    01-17 06:40:31.801: E/AndroidRuntime(1263): java.lang.NullPointerException 
    01-17 06:40:31.801: E/AndroidRuntime(1263):  at com.example.testreadcontacts.ContactAdapter.getView(ContactAdapter.java:50) 
    01-17 06:40:31.801: E/AndroidRuntime(1263):  at android.widget.AbsListView.obtainView(AbsListView.java:2271) 
    01-17 06:40:31.801: E/AndroidRuntime(1263):  at android.widget.ListView.measureHeightOfChildren(ListView.java:1244) 
    01-17 06:40:31.801: E/AndroidRuntime(1263):  at android.widget.ListView.onMeasure(ListView.java:1156) 
    01-17 06:40:31.801: E/AndroidRuntime(1263):  at android.view.View.measure(View.java:15172) 
    01-17 06:40:31.801: E/AndroidRuntime(1263):  at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:4816) 
    01-17 06:40:31.801: E/AndroidRuntime(1263):  at android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java:1390) 
    01-17 06:40:31.801: E/AndroidRuntime(1263):  at android.widget.LinearLayout.measureVertical(LinearLayout.java:681) 
    01-17 06:40:31.801: E/AndroidRuntime(1263):  at android.widget.LinearLayout.onMeasure(LinearLayout.java:574) 
    01-17 06:40:31.801: E/AndroidRuntime(1263):  at android.view.View.measure(View.java:15172) 
    01-17 06:40:31.801: E/AndroidRuntime(1263):  at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:4816) 
    01-17 06:40:31.801: E/AndroidRuntime(1263):  at android.widget.FrameLayout.onMeasure(FrameLayout.java:310) 
    01-17 06:40:31.801: E/AndroidRuntime(1263):  at android.view.View.measure(View.java:15172) 
    01-17 06:40:31.801: E/AndroidRuntime(1263):  at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:4816) 
    01-17 06:40:31.801: E/AndroidRuntime(1263):  at android.widget.FrameLayout.onMeasure(FrameLayout.java:310) 
    01-17 06:40:31.801: E/AndroidRuntime(1263):  at android.view.View.measure(View.java:15172) 
    01-17 06:40:31.801: E/AndroidRuntime(1263):  at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:4816) 
    01-17 06:40:31.801: E/AndroidRuntime(1263):  at android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java:1390) 
    01-17 06:40:31.801: E/AndroidRuntime(1263):  at android.widget.LinearLayout.measureVertical(LinearLayout.java:681) 
    01-17 06:40:31.801: E/AndroidRuntime(1263):  at android.widget.LinearLayout.onMeasure(LinearLayout.java:574) 
    01-17 06:40:31.801: E/AndroidRuntime(1263):  at android.view.View.measure(View.java:15172) 
    01-17 06:40:31.801: E/AndroidRuntime(1263):  at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:4816) 
    01-17 06:40:31.801: E/AndroidRuntime(1263):  at android.widget.FrameLayout.onMeasure(FrameLayout.java:310) 
    01-17 06:40:31.801: E/AndroidRuntime(1263):  at android.view.View.measure(View.java:15172) 
    01-17 06:40:31.801: E/AndroidRuntime(1263):  at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:4816) 
    01-17 06:40:31.801: E/AndroidRuntime(1263):  at android.widget.FrameLayout.onMeasure(FrameLayout.java:310) 
    01-17 06:40:31.801: E/AndroidRuntime(1263):  at android.view.View.measure(View.java:15172) 
    01-17 06:40:31.801: E/AndroidRuntime(1263):  at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:4816) 
    01-17 06:40:31.801: E/AndroidRuntime(1263):  at android.widget.FrameLayout.onMeasure(FrameLayout.java:310) 
    01-17 06:40:31.801: E/AndroidRuntime(1263):  at com.android.internal.policy.impl.PhoneWindow$DecorView.onMeasure(PhoneWindow.java:2148) 
    01-17 06:40:31.801: E/AndroidRuntime(1263):  at android.view.View.measure(View.java:15172) 
    01-17 06:40:31.801: E/AndroidRuntime(1263):  at android.view.ViewRootImpl.performMeasure(ViewRootImpl.java:1850) 
    01-17 06:40:31.801: E/AndroidRuntime(1263):  at android.view.ViewRootImpl.measureHierarchy(ViewRootImpl.java:1102) 
    01-17 06:40:31.801: E/AndroidRuntime(1263):  at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:1275) 
    01-17 06:40:31.801: E/AndroidRuntime(1263):  at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:1000) 
    01-17 06:40:31.801: E/AndroidRuntime(1263):  at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:4214) 
    01-17 06:40:31.801: E/AndroidRuntime(1263):  at android.view.Choreographer$CallbackRecord.run(Choreographer.java:725) 
    01-17 06:40:31.801: E/AndroidRuntime(1263):  at android.view.Choreographer.doCallbacks(Choreographer.java:555) 
    01-17 06:40:31.801: E/AndroidRuntime(1263):  at android.view.Choreographer.doFrame(Choreographer.java:525) 
    01-17 06:40:31.801: E/AndroidRuntime(1263):  at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:711) 
    01-17 06:40:31.801: E/AndroidRuntime(1263):  at android.os.Handler.handleCallback(Handler.java:615) 
    01-17 06:40:31.801: E/AndroidRuntime(1263):  at android.os.Handler.dispatchMessage(Handler.java:92) 
    01-17 06:40:31.801: E/AndroidRuntime(1263):  at android.os.Looper.loop(Looper.java:137) 
    01-17 06:40:31.801: E/AndroidRuntime(1263):  at android.app.ActivityThread.main(ActivityThread.java:4745) 
    01-17 06:40:31.801: E/AndroidRuntime(1263):  at java.lang.reflect.Method.invokeNative(Native Method) 
    01-17 06:40:31.801: E/AndroidRuntime(1263):  at java.lang.reflect.Method.invoke(Method.java:511) 
    01-17 06:40:31.801: E/AndroidRuntime(1263):  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:786) 
    01-17 06:40:31.801: E/AndroidRuntime(1263):  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553) 
    01-17 06:40:31.801: E/AndroidRuntime(1263):  at dalvik.system.NativeStart.main(Native Method)

来源

2013-01-17 Olia Bric

ContactAdapter.java:50是什么？ –

它的自定义适配器 –

我的意思是该文件的第50行是什么？ –

convertView.setTag(holder);

这是检查空块内。如果你点击这一行，那么该变量将被保留为空。你希望它是view.setTag。

来源

2013-01-17 07:17:14

太棒了！我改变这一行 –

我GUE ss是，所述接触可以为空，尝试：

Contact c = getContact(position); 
if(c != null) { 
    holder.tvName.setText(c.name); 
    holder.tvPhone.setText(c.phone); 
}

来源

2013-01-17 07:15:01 Nermeen

自定义listview在自定义alertdialog中崩溃

回答

相关问题