1
我有一个扩展simplecursoradapter的适配器。出于某种原因，我似乎无法看到，我的getView甚至没有被调用。我在getView中有一个断点，它永远不会到达那里，列表只显示为空。任何人都可以看看，看看我做错了什么？为什么getView没有被调用？
package com.example.ok1;
import java.text.SimpleDateFormat;
import java.util.Date;
import android.app.Activity;
import android.content.ContentValues;
import android.content.Intent;
import android.content.SharedPreferences;
import android.content.SharedPreferences.Editor;
import android.database.Cursor;
import android.database.SQLException;
import android.database.sqlite.SQLiteDatabase;
import android.os.Bundle;
import android.util.Log;
import android.util.SparseBooleanArray;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.ListView;
import android.widget.TextView;
import android.app.ListActivity;
public class MainActivity extends Activity {
// Button btnCalendar;
//*******************************************8
String[] names = {"Иван", "Марья", "Петр", "Антон", "Даша", "Борис",
"Костя", "Игорь", "Анна", "Денис", "Андрей"};
//Button buttonAddTask;
final String Tag="States";
final String Ten = "Ten";
TextView txtDataTaskToday;
String id_for_listtsk_today;
ListView lvMain_today;
String[] arr_date;
SharedPreferences sPref;
static Cursor c;
private ListView listView = null;
//public static String id_for_listtsk_today;
// static SQLiteDatabase db;
MySqlCursorAdapter adapter = null;
//***********************************************8
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
// btnCalendar = (Button) findViewById(R.id.btnActTwo);
// btnCalendar.setOnClickListener(this);
//*********************************************
// переменные для query
String[] columns = null;
String selection = null;
String[] selectionArgs = null;
String groupBy = null;
String having = null;
String orderBy = null;
//*********работа с БД****************
// создаем объект для данных
// txtDataTaskToday = (TextView) findViewById(R.id.txtDataTaskToday);
SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
String id_for_listtsk_today = sdf.format(new Date());
//final String b = id_for_listtsk_today;
// txtDataTaskToday.setText(id_for_listtsk_today.toString());
Log.d(Tag, "id_for_listtsk_today ="+id_for_listtsk_today);
ContentValues cv = new ContentValues();
DBHelper dbHelper = new DBHelper(this);
final SQLiteDatabase db = dbHelper.getWritableDatabase();
columns = new String[] {"name"};
selection = "data_id = ?";
selectionArgs = new String[] {id_for_listtsk_today};
//c = db.query("mytable", columns, selection, selectionArgs, null, null, null);
try {
c=dbHelper.getCursor();
} catch (SQLException sqle) {
Log.d(Tag, "неудача");
throw sqle;
}
String[] arr_date = logCursor(c);
//*********работа с БД****************
lvMain_today = (ListView) findViewById(R.id.list);
// lvMain_today.setChoiceMode(ListView.CHOICE_MODE_MULTIPLE);
//this.listView=getl
//listView = MainActivity.this.getlgetListView();
lvMain_today.setItemsCanFocus(false);
lvMain_today.setChoiceMode(ListView.CHOICE_MODE_MULTIPLE);
//ArrayAdapter<String> adapter = new ArrayAdapter<String>(this,android.R.layout.simple_list_item_multiple_choice, arr_date);// R.layout.item, my_list_item
startManagingCursor(c);
int[] listFields = new int[] { R.id.txtTitle };
String[] dbColumns = new String[] { DBHelper.COLUMN_NAME };
Log.d(Tag, "трассировка");
MainActivity.this.adapter = new MySqlCursorAdapter(
this, R.layout.my_list_item,
c, dbColumns, listFields,
dbHelper);
//
lvMain_today.setAdapter(MainActivity.this.adapter);
// setListAdapter(MainActivity.this.adapter);
names = arr_date;
c.close();
db.close();
dbHelper.close();
lvMain_today.setOnItemClickListener(new OnItemClickListener() {
public void onItemClick(AdapterView<?> parent, View view,
int position, long id) {
SparseBooleanArray chosen = ((ListView) parent).getCheckedItemPositions();
for (int i = 0; i < chosen.size(); i++) {
int key = chosen.keyAt(i);
if (chosen.get(key))
Log.d(Tag, "выделены ====="+names[key]);
Log.d(Tag, "itemClick: position = " + position + ", id = "
+ id);}
//****************nen пробная фигня**************
// String[] columns = null;
// String selection = null;
// String[] selectionArgs = null;
// String groupBy = null;
// String having = null;
// String orderBy = null;
// columns = new String[] {"name"};
// selection = "data_id = ?";
// selectionArgs = new String[] {id_for_listtsk_today};//id_for_listtsk_today
// Cursor c = db.query("mytable", columns, selection, selectionArgs, null, null, null);
// String[] arr = logCursor(c);
//**************************************************
// String s=test();
}
});
// lvMain_today.setOnItemSelectedListener(new OnItemSelectedListener() {
// public void onItemSelected(AdapterView<?> parent, View view,
// int position, long id) {
// Log.d(Tag, "Было выделение позиции меню!!!!position = " + position + ", id = "
// + id);
// }
//
// public void onNothingSelected(AdapterView<?> parent) {
// Log.d(Tag, "itemSelect: nothing");
// }
// });
}
private String[] logCursor(Cursor c) {
// TODO Auto-generated method stub
final String Tag="States";
String[] arr_date = new String[c.getCount()];//String[] arr_date = new String[] {};
Log.d(Tag,"мы в курсоре");
if (c!=null) {
if (c.moveToFirst()) {
// Log.d(Tag,"мы в курсоре1");
String str;
int i=-1;
do {
// Log.d(Tag,"мы в курсоре2");
str="";
i=i+1;
for (String cn: c.getColumnNames()) {
str = str.concat(c.getString(c.getColumnIndex(cn)));
}
Log.d(Tag, "++++"+str);
arr_date[i]=String.valueOf(str);
} while (c.moveToNext());
}
}
return arr_date;
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
menu.add(0, 1, 0, "календарь");
menu.add(0, 2, 0, "Убрать выполненные");
menu.add(0, 3, 3, "Уйти");
// menu.add(1, 4, 1, "copy");
// menu.add(1, 5, 2, "paste");
// menu.add(1, 6, 4, "exit");
return super.onCreateOptionsMenu(menu);
// getMenuInflater().inflate(R.menu.main, menu);
//return true;
}
public boolean onOptionsItemSelected(MenuItem item) {
// TODO Auto-generated method stub
StringBuilder sb = new StringBuilder();
// Выведем в TextView информацию о нажатом пункте меню
// txtDataTaskToday.setText("Item Menu");
// txtDataTaskToday.setText(item.getGroupId());
//// txtDataTaskToday.setText("\r\n itemId: " + String.valueOf(item.getItemId()));
// txtDataTaskToday.setText("\r\n order: " + String.valueOf(item.getOrder()));
// txtDataTaskToday.setText("\r\n title: " + item.getTitle());
switch (item.getItemId()) {
case 1:
Intent intent = new Intent(this, ToDoCalendarActivity.class);
startActivity(intent);
break;
case 2:
SparseBooleanArray sbArray = lvMain_today.getCheckedItemPositions();
for (int i = 0; i < sbArray.size(); i++) {
int key = sbArray.keyAt(i);
if (sbArray.get(key))
Log.d(Tag, "выделены "+names[key]);
sPref = getPreferences(MODE_PRIVATE);
Editor ed = sPref.edit();
ed.putString(Ten, "1");
ed.commit();
Log.d(Tag, "ставим константу для скрытия");
}
break;
case 3:
sPref = getPreferences(MODE_PRIVATE);
String savedText = sPref.getString(Ten, "");
Log.d(Tag, "ten= "+ savedText);
finish();
break;
}
return super.onOptionsItemSelected(item);
}
// @Override
// public void onClick(View v) {
// // TODO Auto-generated method stub
// switch (v.getId()) {
// case R.id.btnActTwo:
//
// Intent intent = new Intent(this, ToDoCalendarActivity.class);
// startActivity(intent);
// break;
// }
// }
}
MySqlCursorAdapter
package com.example.ok1;
import android.content.ContentValues;
import android.content.Context;
import android.database.Cursor;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.ViewGroup;
import android.widget.CheckBox;
import android.widget.SimpleCursorAdapter;
import android.widget.TextView;
public class MySqlCursorAdapter extends SimpleCursorAdapter implements OnClickListener {
final String Tag="States";
private Context context;
private DBHelper dbHelper;
private Cursor currentCursor;
public MySqlCursorAdapter(Context context, int layout, Cursor c,
String[] from, int[] to, DBHelper dbHelper) {
super(context, layout, c, from, to);
Log.d(Tag, "трассировка1");
this.currentCursor = c;
this.context = context;
this.dbHelper = dbHelper;
Log.d(Tag, "MySqlCursorAdapter()");
Integer b = c.getCount();
Log.d(Tag, "b="+b);
}
public View getView(int pos, View inView, ViewGroup parent) {
Log.d(Tag, "getView() + posss=" + pos);
View v = inView;
if (v == null) {
LayoutInflater inflater = (LayoutInflater) context
.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
v = inflater.inflate(R.layout.my_list_item, null);
}
this.currentCursor.moveToPosition(pos);
CheckBox cBox = (CheckBox) v.findViewById(R.id.bcheck);
cBox.setTag(Integer.parseInt(this.currentCursor
.getString(this.currentCursor
.getColumnIndex(DBHelper.COLUMN_ID))));
Log.d(Tag, "tag="+cBox.getTag().toString());
if (this.currentCursor.getString(this.currentCursor
.getColumnIndex(DBHelper.COLUMN_STATUS)) != null
&& Integer.parseInt(this.currentCursor
.getString(this.currentCursor
.getColumnIndex(DBHelper.COLUMN_STATUS))) != 0) {
cBox.setChecked(true);
} else {
cBox.setChecked(false);
}
cBox.setOnClickListener(this);
TextView txtTitle = (TextView) v.findViewById(R.id.txtTitle);
txtTitle.setText(this.currentCursor.getString(this.currentCursor
.getColumnIndex(DBHelper.COLUMN_NAME)));
return (v);
}
public void ClearSelections() {
Log.d(Tag, "ClearSelections()");
//this.dbHelper.clearSelections();
//this.currentCursor.requery();
}
@Override
public void onClick(View v) {
Log.d(Tag, "onClick");
CheckBox cBox = (CheckBox) v;
Integer _id = (Integer) cBox.getTag();
Log.d(Tag, "Integer _id="+_id.toString());
ContentValues values = new ContentValues();
values.put(" selected", cBox.isChecked() ? 1 : 0);
//this.dbHelper.dbSqlite.update(SqlHelper.TABLE_NAME, values, "_id=?",
// new String[] { Integer.toString(_id) });
}
}
DBHelper
package com.example.ok1;
import android.content.Context;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteOpenHelper;
import android.database.sqlite.SQLiteQueryBuilder;
import android.util.Log;
public class DBHelper extends SQLiteOpenHelper {
final String Tag="States";
public static final String COLUMN_ID = "_id";
public static final String COLUMN_DATA = "data_id";
public static final String COLUMN_NAME = "name";
public static final String COLUMN_STATUS = "status";
public static final String TABLE_NAME = "mytable";
public SQLiteDatabase dbSqlite;
public DBHelper(Context context) {
// конструктор суперкласса
super(context, "myDB", null, 1);
}
@Override
public void onCreate(SQLiteDatabase db) {
Log.d(Tag, "--- onCreate database ---");
// создаем таблицу с полями
db.execSQL("create table mytable ("
+ "_id integer primary key autoincrement,"
+ "data_id text,"
+ "name text,"
+ "task text,"
+ "status integer"
+ ");");
}
@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
}
public Cursor getCursor() {
Log.d(Tag, "getCursor() получили курсор с базы");
String[] columns = null;
String selection = null;
String[] selectionArgs = null;
String groupBy = null;
String having = null;
String orderBy = null;
// SQLiteQueryBuilder queryBuilder = new SQLiteQueryBuilder();
// queryBuilder.setTables(TABLE_NAME);
// String[] asColumnsToReturn = new String[] { COLUMN_ID, COLUMN_NAME,
// COLUMN_DATA, COLUMN_STATUS };
// Cursor mCursor = queryBuilder.query(dbSqlite, asColumnsToReturn, null,
// null, null, null, "title ASC");
// Log.d(Tag, "getCursor() получили курсор с базы конец");
final SQLiteDatabase db = this.getWritableDatabase();
columns = new String[] { COLUMN_ID, COLUMN_DATA, COLUMN_NAME, COLUMN_STATUS };
// selection = "data_id = ?";
// selectionArgs = new String[] {id_for_listtsk_today};
Cursor c = db.query("mytable", columns, null, null, null, null, null);
return c;
}
}
ActivityMain.xml
<!--?xml version="1.0" encoding="utf-8"?-->
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:orientation="vertical" android:layout_width="fill_parent" android:layout_height="fill_parent" android:background="#81BEF7" android:scrollbars="vertical">
<TableLayout android:id="@+id/TableLayout01" android:layout_width="fill_parent" android:layout_height="fill_parent" >
<TableRow>
<ListView
android:id="@+id/list"
android:layout_width="wrap_content"
android:layout_height="wrap_content" >
</ListView>
</TableRow>
</TableLayout>
</LinearLayout>
my_list_item.xml
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:gravity="center_vertical"
android:orientation="horizontal" >
<CheckBox
android:id="@+id/bcheck"
android:layout_height="wrap_content"
android:layout_width="wrap_content"
android:focusable="false">
</CheckBox>
<TextView
android:id="@+id/txtTitle"
android:layout_width="138dp"
android:layout_height="?android:attr/listPreferredItemHeight"
android:focusable="false"
android:gravity="left|center_vertical"
android:text="Test" >
</TextView>
<LinearLayout
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:gravity="right|center_vertical"
android:orientation="horizontal" >
<ImageButton
android:id="@+id/ImageButton01"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_weight="0.50"
android:clickable="true" >
</ImageButton>
</LinearLayout>
</LinearLayout>
你有NPE吗？ –
不，只是不叫getview – kelebro63
@Override注释丢失 – jeevamuthu