我有自定义SimpleCursorAdapter MySqlCursorAdapter。我想在我的班级MySqlCursorAdapter中使用PageFragment但是，我有一个错误。
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public class Pager extends FragmentActivity {
SQLiteDatabase db;
Cursor c;
ContentValues cv;
static final String Tag = "States";
static final int PAGE_COUNT = 4;
ViewPager pager;
PagerAdapter pagerAdapter;
LinearLayout L_view;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.pager);
//мой блок получаю курсор
SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
String id_for_listtsk_today = sdf.format(new Date());
ContentValues cv = new ContentValues();
DBHelper dbHelper = new DBHelper(this);
final SQLiteDatabase db = dbHelper.getWritableDatabase();
try {
c=dbHelper.getCursor(id_for_listtsk_today);
} catch (SQLException sqle) {
Log.d(Tag, "неудача");
throw sqle;
}
//String[] arr_date = logCursor(c);
c.close();
db.close();
pager = (ViewPager) findViewById(R.id.pager);
pagerAdapter = new MyFragmentPagerAdapter(getSupportFragmentManager());
pager.setAdapter(pagerAdapter);
pager.setOnPageChangeListener(new OnPageChangeListener() {
@Override
public void onPageSelected(int position) {
Log.d(Tag, "onPageSelected, position = " + position);
}
@Override
public void onPageScrolled(int position, float positionOffset,
int positionOffsetPixels) {
}
@Override
public void onPageScrollStateChanged(int state) {
}
});
}
/*@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
return true;
}*/
private class MyFragmentPagerAdapter extends FragmentPagerAdapter {
public MyFragmentPagerAdapter(FragmentManager fm) {
super(fm);
}
@Override
public Fragment getItem(int position) {
return PageFragment.newInstance(position);
}
@Override
public int getCount() {
return PAGE_COUNT;
}
@Override
public CharSequence getPageTitle(int position) {
return "Title " + position;
}
}
static 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;
}
}
PageFragment.java
public class PageFragment extends Fragment {
static final String ARGUMENT_PAGE_NUMBER = "arg_page_number";
int pageNumber;
int backColor;
final String Tag="States";
SQLiteDatabase db;
static Cursor c, c2;
ContentValues cv;
static int itemselected, id_itemselected;
final static int M_EDIT1 = 100;
final static int M_EDIT2 = 101;
final static int M_DELETE = 102;
final static int M_ADD = 103;
final static int M_REF = 104;
final static int D_EDIT = 200;
final static int D_DELETE = 201;
final static int D_ADD = 202;
ListView lvMain_today;
DialogFragment dlg1;
TextView tv;
static SimpleCursorAdapter scAdapter, scAdapter2;
MySqlCursorAdapter adapter = null;
static PageFragment newInstance(int page) {
PageFragment pageFragment = new PageFragment();
Bundle arguments = new Bundle();
arguments.putInt(ARGUMENT_PAGE_NUMBER, page);
pageFragment.setArguments(arguments);
return pageFragment;
}
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
pageNumber = getArguments().getInt(ARGUMENT_PAGE_NUMBER);
// dlg1 = new dialog_edit();
}
@Override
public boolean onContextItemSelected(MenuItem item)
{
switch (item.getItemId())
{
case M_EDIT1:
dlg1.show(getFragmentManager(), "dlg1");
break;
case M_EDIT2:
Toast.makeText(getActivity(), "Изменение во втором списке", Toast.LENGTH_SHORT).show();
break;
case M_DELETE:
//dlg2.show(getFragmentManager(), "dlg2");
break;
case M_ADD:
break;
default:
return super.onContextItemSelected(item);
}
return true;
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
Log.d(Tag, "onCreateView1");
View view = inflater.inflate(R.layout.activity_page_fragment, null);
lvMain_today = (ListView) view.findViewById(R.id.list);
//tv = (TextView) view.findViewById(R.id.tv);
Log.d(Tag, "onCreateView2");
OnCreateContextMenuListener occm1 = new OnCreateContextMenuListener() {
@Override
public void onCreateContextMenu(ContextMenu menu, View v,
ContextMenuInfo menuInfo) {
// TODO Auto-generated method stub
AdapterContextMenuInfo aMenuInfo = (AdapterContextMenuInfo) menuInfo;
itemselected = aMenuInfo.position;
id_itemselected = (int) aMenuInfo.id;
menu.add(Menu.NONE, M_EDIT1, Menu.NONE, "Изменить1");
menu.add(Menu.NONE, M_DELETE, Menu.NONE, "Удалить1");
menu.add(Menu.NONE, M_ADD, Menu.NONE, Integer.toString(id_itemselected));
}
};
Log.d(Tag, "onCreateView3");
OnCreateContextMenuListener occm2 = new OnCreateContextMenuListener() {
@Override
public void onCreateContextMenu(ContextMenu menu, View v,
ContextMenuInfo menuInfo) {
// TODO Auto-generated method stub
AdapterContextMenuInfo aMenuInfo = (AdapterContextMenuInfo) menuInfo;
itemselected = aMenuInfo.position;
id_itemselected = (int) aMenuInfo.id;
menu.add(Menu.NONE, M_EDIT2, Menu.NONE, "Изменить2");
menu.add(Menu.NONE, M_DELETE, Menu.NONE, "Удалить2");
menu.add(Menu.NONE, M_ADD, Menu.NONE, Integer.toString(id_itemselected));
}
};
switch (pageNumber){
case 0:
Log.d(Tag, "switch (pageNumber)1");
// DBase = new DataBase(getActivity());
// db = DBase.getWritableDatabase();
// c = db.query("items1", null, null, null, null, null, null);
case 1:
//пробуем*****
Log.d(Tag, "onCreateView4");
SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
String id_for_listtsk_today = sdf.format(new Date());
ContentValues cv = new ContentValues();
DBHelper dbHelper = new DBHelper(getActivity());
final SQLiteDatabase db = dbHelper.getWritableDatabase();
Log.d(Tag, "onCreateView5");
try {
c=dbHelper.getCursor(id_for_listtsk_today);
} catch (SQLException sqle) {
Log.d(Tag, "неудача");
throw sqle;
}
String[] arr_date = Pager.logCursor(c);
//*************
Log.d(Tag, "onCreateView6");
getActivity().startManagingCursor(c);
int[] listFields = new int[] { R.id.txtTitle, R.id.textData1 };
String[] dbColumns = new String[] { DBHelper.COLUMN_NAME, DBHelper.COLUMN_TASK };
// Log.d(Tag, "трассировка" );
adapter = new MySqlCursorAdapter(
getActivity(), R.layout.my_list_item,
c, dbColumns, listFields,
dbHelper);
Log.d(Tag, "onCreateView7");
lvMain_today.setAdapter(adapter);
registerForContextMenu(lvMain_today);
lvMain_today.setOnCreateContextMenuListener(occm1);
db.close();
break;
// Log.d(Tag, "switch (pageNumber)2");
// DBase = new DataBase(getActivity());
// db = DBase.getWritableDatabase();
// c2 = db.query("items2", null, null, null, null, null, null);
// getActivity().startManagingCursor(c2);
// String[] from2 = new String[] {"item"};
// int[] to2 = new int[] {R.id.tvText};
// scAdapter2 = new SimpleCursorAdapter(getActivity(), R.layout.item, c2, from2, to2);
// lvMain.setAdapter(scAdapter2);
// lvMain.setOnCreateContextMenuListener(occm2);
// db.close();
// break;
}
return view;
}
}
MySQLCcursorAdapter.java
public class MySqlCursorAdapter extends SimpleCursorAdapter implements OnClickListener {
final String Tag="States";
private Context context;
private DBHelper dbHelper;
private Cursor currentCursor;
TextView txtTitle;
TextView txtTitle1;
final String needsAction="completed";
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
&& String.valueOf(this.currentCursor
.getString(this.currentCursor
.getColumnIndex(DBHelper.COLUMN_STATUS))).equals(needsAction)) {
cBox.setChecked(true);
} else {
cBox.setChecked(false);
}
cBox.setOnClickListener(this);
txtTitle = (TextView) v.findViewById(R.id.txtTitle);
txtTitle1 = (TextView) v.findViewById(R.id.textData1);
txtTitle.setText(this.currentCursor.getString(this.currentCursor
.getColumnIndex(DBHelper.COLUMN_TIME))+" , "+this.currentCursor.getString(this.currentCursor
.getColumnIndex(DBHelper.COLUMN_NAME)));
txtTitle1.setText(this.currentCursor.getString(this.currentCursor
.getColumnIndex(DBHelper.COLUMN_TASK)));
if (cBox.isChecked())
{
//Log.d(Tag, " pos=" + pos);
txtTitle.setPaintFlags(txtTitle.getPaintFlags() | Paint.STRIKE_THRU_TEXT_FLAG);
txtTitle1.setPaintFlags(txtTitle1.getPaintFlags() | Paint.STRIKE_THRU_TEXT_FLAG);
}
else
{
//Log.d(Tag, "!pos=" + pos);
txtTitle.setPaintFlags(txtTitle.getPaintFlags() & ~Paint.STRIKE_THRU_TEXT_FLAG);
txtTitle1.setPaintFlags(txtTitle1.getPaintFlags() & ~Paint.STRIKE_THRU_TEXT_FLAG);
// txtTitle1.setSelected(true);
}
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(View v) в адаптере");
if(dbHelper.dbSqlite==null) {
//Log.d(Tag, "00000000000");
SQLiteDatabase db = dbHelper.getWritableDatabase();
//Log.d(Tag, "onClick");
CheckBox cBox = (CheckBox) v;
Integer _id = (Integer) cBox.getTag();
//Integer _id = 4;
//Log.d(Tag, "Integer _id="+_id.toString());
ContentValues values = new ContentValues();
values.put(" status", cBox.isChecked() ? "completed" : "needsAction");
try {
db.update("mytable", values, "_id = ?", new String[] { Integer.toString(_id) });
} catch (SQLException sqle) {
// Log.d(Tag, "неудача");
throw sqle;
}
}
}}
日志
06-10 09:23:52.437: D/States(5342): MainActivity: onDestroy()
06-10 09:23:52.460: D/States(5342): запустили службу ServiceUpdate
06-10 09:23:52.812: D/States(5605): onStartCommand
06-10 09:23:52.828: D/States(5605): onCreate
06-10 09:23:52.843: D/States(5605): Service onDestroy(). Stop AlarmManager at 2013-06-10 09:23:52.834
06-10 09:23:52.843: V/com.example.ok1.ServiceUpdate(5605): AlarmManger started at 2013-06-10 09:23:52.847
06-10 09:23:52.953: D/States(5342): getCursor() получаем курсор с базы
06-10 09:23:52.960: D/States(5342): getCursor() получили курсор с базы
06-10 09:23:53.031: D/States(5342): onCreateView1
06-10 09:23:53.078: D/dalvikvm(5342): GC_EXTERNAL_ALLOC freed 236K, 47% free 3103K/5767K, external 973K/1036K, paused 42ms
06-10 09:23:53.125: D/States(5342): onCreateView2
06-10 09:23:53.125: D/States(5342): onCreateView3
06-10 09:23:53.125: D/States(5342): switch (pageNumber)1
06-10 09:23:53.125: D/States(5342): onCreateView4
06-10 09:23:53.148: D/States(5342): onCreateView5
06-10 09:23:53.148: D/States(5342): getCursor() получаем курсор с базы
06-10 09:23:53.164: D/States(5342): getCursor() получили курсор с базы
06-10 09:23:53.164: D/States(5342): мы в курсоре
06-10 09:23:53.164: D/States(5342): onCreateView6
06-10 09:23:53.171: D/States(5342): onCreateView7
06-10 09:24:29.335: D/AndroidRuntime(5342): Shutting down VM
06-10 09:24:29.335: W/dalvikvm(5342): threadid=1: thread exiting with uncaught exception (group=0x40018578)
06-10 09:24:29.398: E/AndroidRuntime(5342): FATAL EXCEPTION: main
06-10 09:24:29.398: E/AndroidRuntime(5342): java.lang.NullPointerException
06-10 09:24:29.398: E/AndroidRuntime(5342): at com.example.ok1.PageFragment.onCreateView(PageFragment.java:191)
06-10 09:24:29.398: E/AndroidRuntime(5342): at android.support.v4.app.Fragment.performCreateView(Fragment.java:1460)
06-10 09:24:29.398: E/AndroidRuntime(5342): at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:911)
06-10 09:24:29.398: E/AndroidRuntime(5342): at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1088)
06-10 09:24:29.398: E/AndroidRuntime(5342): at android.support.v4.app.BackStackRecord.run(BackStackRecord.java:682)
06-10 09:24:29.398: E/AndroidRuntime(5342): at android.support.v4.app.FragmentManagerImpl.execPendingActions(FragmentManager.java:1444)
06-10 09:24:29.398: E/AndroidRuntime(5342): at android.support.v4.app.FragmentManagerImpl.executePendingTransactions(FragmentManager.java:461)
06-10 09:24:29.398: E/AndroidRuntime(5342): at android.support.v4.app.FragmentPagerAdapter.finishUpdate(FragmentPagerAdapter.java:141)
06-10 09:24:29.398: E/AndroidRuntime(5342): at android.support.v4.view.ViewPager.populate(ViewPager.java:1064)
06-10 09:24:29.398: E/AndroidRuntime(5342): at android.support.v4.view.ViewPager.populate(ViewPager.java:911)
06-10 09:24:29.398: E/AndroidRuntime(5342): at android.support.v4.view.ViewPager.onMeasure(ViewPager.java:1432)
06-10 09:24:29.398: E/AndroidRuntime(5342): at android.view.View.measure(View.java:8313)
06-10 09:24:29.398: E/AndroidRuntime(5342): at android.widget.RelativeLayout.measureChildHorizontal(RelativeLayout.java:581)
06-10 09:24:29.398: E/AndroidRuntime(5342): at android.widget.RelativeLayout.onMeasure(RelativeLayout.java:365)
06-10 09:24:29.398: E/AndroidRuntime(5342): at android.view.View.measure(View.java:8313)
06-10 09:24:29.398: E/AndroidRuntime(5342): at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:3138)
06-10 09:24:29.398: E/AndroidRuntime(5342): at android.widget.FrameLayout.onMeasure(FrameLayout.java:250)
06-10 09:24:29.398: E/AndroidRuntime(5342): at android.view.View.measure(View.java:8313)
06-10 09:24:29.398: E/AndroidRuntime(5342): at android.widget.LinearLayout.measureVertical(LinearLayout.java:531)
06-10 09:24:29.398: E/AndroidRuntime(5342): at android.widget.LinearLayout.onMeasure(LinearLayout.java:309)
06-10 09:24:29.398: E/AndroidRuntime(5342): at android.view.View.measure(View.java:8313)
06-10 09:24:29.398: E/AndroidRuntime(5342): at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:3138)
06-10 09:24:29.398: E/AndroidRuntime(5342): at android.widget.FrameLayout.onMeasure(FrameLayout.java:250)
06-10 09:24:29.398: E/AndroidRuntime(5342): at android.view.View.measure(View.java:8313)
06-10 09:24:29.398: E/AndroidRuntime(5342): at android.view.ViewRoot.performTraversals(ViewRoot.java:847)
06-10 09:24:29.398: E/AndroidRuntime(5342): at android.view.ViewRoot.handleMessage(ViewRoot.java:1867)
06-10 09:24:29.398: E/AndroidRuntime(5342): at android.os.Handler.dispatchMessage(Handler.java:99)
06-10 09:24:29.398: E/AndroidRuntime(5342): at android.os.Looper.loop(Looper.java:130)
06-10 09:24:29.398: E/AndroidRuntime(5342): at android.app.ActivityThread.main(ActivityThread.java:3687)
06-10 09:24:29.398: E/AndroidRuntime(5342): at java.lang.reflect.Method.invokeNative(Native Method)
06-10 09:24:29.398: E/AndroidRuntime(5342): at java.lang.reflect.Method.invoke(Method.java:507)
06-10 09:24:29.398: E/AndroidRuntime(5342): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:867)
06-10 09:24:29.398: E/AndroidRuntime(5342): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:625)
06-10 09:24:29.398: E/AndroidRuntime(5342): at dalvik.system.NativeStart.main(Native Method)
06-10 09:24:32.070: W/jdwp(5342): Debugger is telling the VM to exit with code=1
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:background="#CCFFCC"
android:gravity="center_vertical"
android:orientation="horizontal" >
<CheckBox
android:id="@+id/bcheck"
android:layout_width="62dp"
android:layout_height="wrap_content"
android:layout_marginLeft="15dp"
android:focusable="false"
android:gravity="center_vertical|center_horizontal" />
<LinearLayout
android:layout_width="246dp"
android:layout_height="match_parent"
android:orientation="vertical" >
<TextView
android:id="@+id/txtTitle"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:focusable="false"
android:gravity="left|center_vertical"
android:maxLength="25"
android:text="Test"
android:textColor="#000000"
android:textSize="18dp"
android:textStyle="bold" />
<TextView
android:id="@+id/textData1"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:ellipsize="marquee"
android:focusable="false"
android:maxLength="40"
android:maxLines="1"
android:scrollHorizontally="true"
android:text="TextView"
android:textColor="#000000" />
</LinearLayout>
</LinearLayout>
Pager.xml
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".MainActivity">
<android.support.v4.view.ViewPager
android:id="@+id/pager"
android:layout_width="match_parent"
android:layout_height="match_parent">
<android.support.v4.view.PagerTabStrip
android:id="@+id/pagerTabStrip"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_gravity="top">
</android.support.v4.view.PagerTabStrip>
</android.support.v4.view.ViewPager>
</RelativeLayout>
activity_page_fragment.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical">
<ListView
android:id="@+id/lvMain"
android:layout_width="match_parent"
android:layout_height="wrap_content">
</ListView>
<TextView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="@+id/tv"
android:text="Запись 1">
</TextView>
</LinearLayout>
我做错了什么？
答案 0 :(得分：1)
您正在使用
搜索ListView lvMain_today = (ListView) view.findViewById(R.id.list);
但在activity_page_fragment.xml内，ID为android:id="@+id/lvMain"。
因此，访问ListView会在lvMain_today.setAdapter(adapter);
请将布局xml中的ID更改为 R.id.list 。
也许这个tutorial可以帮助您理解堆栈跟踪。