应用自定义的ListView对于一个的CursorAdapter

问题描述

我建立用于列出从联系人光标接触与该联系人的电话号码和姓名，以及用于图像的地方两个文本视图列表，自定义列表视图。我得到一个错误nullpoint当我尝试的setText我的TextView即使我检查变量，看看他们是否包含字符串我没有想法什么不妥的地方。

 公共查看getView（INT位置，查看convertView，父母的ViewGroup）{
 查看rowView = convertView;
 视图缓冲视图缓冲= NULL; 如果（rowView == NULL）{
  LayoutInflater吹气=（LayoutInflater）_context.getSystemService（
        Context.LAYOUT_INFLATER_SERVICE）;  rowView = inflater.inflate（R.layout.row，NULL）;
  视图缓冲=新视图缓冲（rowView）;
  rowView.setTag（视图缓冲）;
 }
 其他{
  视图缓冲=（视图缓冲）rowView.getTag（）;
 }
 _cursor.moveToPosition（位置）;
 INT ID = _cursor.getColumnIndex（People._ID）;
 INT numbercolumn = _cursor.getColumnIndex（People.NUMBER）;
 INT名称列= _cursor.getColumnIndex（People.NAME）;
 字符串标记=标记;
 Log.i（标签的getItem（位置）的ToString（））; 字符串名称;
 串号;
 数= _cursor.getString（numbercolumn）; 名称= _cursor.getString（名称列）; Log.i（test6386号码）;
 Log.i（Test456，名）; TextView的nameView = viewCache.getName（）;
 TextView的numberView = viewCache.getNumber（）;
 nameView.setText（名）;
 numberView.setText（数）; URI URI = ContentUris.withAppendedId（People.CONTENT_URI，_cursor.getLong（ID））;
 位图位图= People.loadContactPhoto（_context，URI，R.drawable.icon，NULL）;
 viewCache.getIcon（）setImageBitmap（位图）。 回报（rowView）;
    }
 

解决方案

我看着办吧，你必须覆盖NewView的和bindview方法

 公共类RowAdapter扩展的CursorAdapter {私人最终LayoutInflater mInflater;公共RowAdapter（上下文的背景下，光标C）{
超（背景下，C）;
mInflater = LayoutInflater.from（上下文）;}@覆盖
公共无效bindView（查看视图，上下文的背景下，光标光标）{视图缓冲视图缓冲= NULL;
查看rowView =视图。
视图缓冲=（视图缓冲）rowView.getTag（）;ImageView的ImageView的=（ImageView的）view.findViewById（R.id.C​​ontactIcon）;
INT ID = cursor.getColumnIndex（HelpiDB.KEY_ID）;
INT名称列= cursor.getColumnIndex（HelpiDB.KEY_NAME）;
INT numbercolumn = cursor.getColumnIndex（HelpiDB.KEY_NUMBER）;
URI URI = ContentUris.withAppendedId（People.CONTENT_URI，cursor.getLong（ID））;位图位图= People.loadContactPhoto（背景下，URI，R.drawable.icon，NULL）;字符串名称= cursor.getString（名称列）;
串号= cursor.getString（numbercolumn）;imageView.setImageBitmap（位图）;TextView的nameTextView = viewCache.getName（）;
nameTextView.setText（名）;TextView的numberTextView = viewCache.getNumber（）;
numberTextView.setText（数）;
ImageView的图标=（ImageView的）view.findViewById（android.R.id.icon）;
布尔交叉=通过Boolean.valueOf（cursor.getString（HelpiDB.CHECK_COLUMN））;如果（交叉）{
    icon.setImageState（新INT [] {} android.R.attr.state_checked，真实）;}其他{
    icon.setImageState（新INT [] {}，真）;}}@覆盖
公共查看NewView的（上下文的背景下，光标光标的ViewGroup父）{最后查看视图= mInflater.inflate（R.layout.row，父母，假）;
视图缓冲视图缓冲=新视图缓冲（视图）;
view.setTag（视图缓冲）;
bindView（查看，背景，光标）;
返回视图。}
 

}

I am building a custom listview used to list contacts from the contact cursor into a list with two text view for the phone number and name of the contact as well as a place for the images. I am getting a nullpoint error when i try to setText for my TextView Even though i checked the variable to see if they contained a string I have no ideas whats wrong with it.

 public View getView(int position, View convertView, ViewGroup parent) {
 View rowView=convertView;
 ViewCache viewCache=null;

 if (rowView==null) {
  LayoutInflater inflater=(LayoutInflater)_context.getSystemService(
        Context.LAYOUT_INFLATER_SERVICE);

  rowView=inflater.inflate(R.layout.row, null);
  viewCache = new ViewCache(rowView);
  rowView.setTag(viewCache);
 }
 else {
  viewCache=(ViewCache)rowView.getTag();
 }
 _cursor.moveToPosition(position);
 int id = _cursor.getColumnIndex(People._ID);
 int numbercolumn = _cursor.getColumnIndex(People.NUMBER);
 int namecolumn = _cursor.getColumnIndex(People.NAME);
 String tag = "tag";
 Log.i(tag, getItem(position).toString());

 String name;
 String number;
 number = _cursor.getString(numbercolumn);

 name = _cursor.getString(namecolumn);

 Log.i("test6386", number);
 Log.i("Test456", name);

 TextView nameView = viewCache.getName();
 TextView numberView = viewCache.getNumber();
 nameView.setText(name);
 numberView.setText(number);

 Uri uri = ContentUris.withAppendedId(People.CONTENT_URI, _cursor.getLong(id));
 Bitmap bitmap = People.loadContactPhoto(_context, uri, R.drawable.icon, null);


 viewCache.getIcon().setImageBitmap(bitmap);

 return(rowView);
    }

解决方案

I figure it out you have to overwrite the newview and bindview methods

public class RowAdapter extends CursorAdapter {

private final LayoutInflater mInflater;

public RowAdapter(Context context, Cursor c) {
super(context, c);
mInflater = LayoutInflater.from(context);

}

@Override
public void bindView(View view, Context context, Cursor cursor) {

ViewCache viewCache = null;
View rowView = view;
viewCache = (ViewCache) rowView.getTag();

ImageView imageView = (ImageView) view.findViewById(R.id.ContactIcon);
int id = cursor.getColumnIndex(HelpiDB.KEY_ID);
int namecolumn = cursor.getColumnIndex(HelpiDB.KEY_NAME);
int numbercolumn = cursor.getColumnIndex(HelpiDB.KEY_NUMBER);
Uri uri = ContentUris.withAppendedId(People.CONTENT_URI, cursor.getLong(id));

Bitmap bitmap = People.loadContactPhoto(context, uri, R.drawable.icon, null);

String name = cursor.getString(namecolumn);
String number = cursor.getString(numbercolumn);

imageView.setImageBitmap(bitmap);

TextView nameTextView = viewCache.getName();
nameTextView.setText(name);

TextView numberTextView = viewCache.getNumber();
numberTextView.setText(number);
ImageView icon = (ImageView) view.findViewById(android.R.id.icon);
boolean crossed = Boolean.valueOf(cursor.getString(HelpiDB.CHECK_COLUMN));

if (crossed) {
    icon.setImageState(new int[] { android.R.attr.state_checked }, true);

} else {
    icon.setImageState(new int[] {}, true);

}

}

@Override
public View newView(Context context, Cursor cursor, ViewGroup parent) {

final View view = mInflater.inflate(R.layout.row, parent, false);
ViewCache viewCache = new ViewCache(view);
view.setTag(viewCache);
bindView(view, context, cursor);
return view;

}

}

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