Android 如何从sqlite数据库中填充listview片段
我被卡住了,无法就如何填写Android 如何从sqlite数据库中填充listview片段,android,sqlite,fragment,android-listfragment,Android,Sqlite,Fragment,Android Listfragment,我被卡住了,无法就如何填写SQLite数据库中的listfragment记录提供建议。我已经尝试了很多教程,但没有一个没有坐下来或失败。我们在创建视图时遇到的最大问题是,理论上我知道如何将Listview放入活动中 在这里加入mainActivity、特定片段和数据库操作类。因为任何帮助都将是最受欢迎的 MainActivity.java package sk.tomino.login; import java.util.Locale; import sk.tomino.login.Nast
SQLite数据库中的listfragment
记录提供建议。我已经尝试了很多教程,但没有一个没有坐下来或失败。我们在创建视图时遇到的最大问题是,理论上我知道如何将Listview放入活动中
在这里加入mainActivity、特定片段和数据库操作类。因为任何帮助都将是最受欢迎的
MainActivity.java
package sk.tomino.login;
import java.util.Locale;
import sk.tomino.login.NastaveniaActivity;
import android.content.Intent;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentActivity;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentPagerAdapter;
import android.support.v4.view.ViewPager;
import android.view.Menu;
import android.view.MenuItem;
import android.widget.Toast;
public class MainActivity extends FragmentActivity {
public static final String PREZIVKA = "prezivka";
MyPagerAdapter mMyPagerAdapter;
ViewPager mViewPager;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Intent i = getIntent();
String prezivka = getResources().getString(R.string.logged)+" "+i.getStringExtra(PREZIVKA);
if (prezivka.length()>0)
Toast.makeText (this, prezivka, Toast.LENGTH_SHORT).show();
mMyPagerAdapter = new MyPagerAdapter(
getSupportFragmentManager());
mViewPager = (ViewPager) findViewById(R.id.pager);
mViewPager.setAdapter(mMyPagerAdapter);
}
@Override
public boolean onCreateOptionsMenu(Menu menu)
{
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
/**
* A {@link FragmentPagerAdapter} that returns a fragment corresponding to
* one of the sections/tabs/pages.
*/
public class MyPagerAdapter extends FragmentPagerAdapter {
public MyPagerAdapter(FragmentManager fm) {
super(fm);
}
@Override
public Fragment getItem(int position) {
switch(position){
case 0:
return UlohaFragment.newInstance();
case 1:
return PredmetFragment.newInstance();
case 2:
return PoznamkaFragment.newInstance();
case 3:
return SviatokFragment.newInstance();
default:
return UlohaFragment.newInstance();
}
}
@Override
public int getCount() {
// Show 4 total pages.
return 4;
}
@Override
public CharSequence getPageTitle(int position) {
Locale l = Locale.getDefault();
switch (position) {
case 0:
return getString(R.string.title_section1).toUpperCase(l);
case 1:
return getString(R.string.title_section2).toUpperCase(l);
case 2:
return getString(R.string.title_section3).toUpperCase(l);
case 3:
return getString(R.string.title_section4).toUpperCase(l);
}
return null;
}
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle presses on the action bar items
switch (item.getItemId()) {
case R.id.action_pridat:
openPridaj();
return true;
case R.id.action_hladat:
openHladaj();
return true;
case R.id.action_settings:
openSettings();
return true;
case R.id.action_app:
openApp();
return true;
default:
return super.onOptionsItemSelected(item);
}
}
public void openPridaj()
{
Intent intent = new Intent(this, PridajActivity.class);
startActivity(intent);
}
public void openHladaj()
{
Intent intent = new Intent(this, HladajActivity.class);
startActivity(intent);
}
public void openSettings()
{
Intent intent = new Intent(this, NastaveniaActivity.class);
startActivity(intent);
}
public void openApp()
{
Intent intent = new Intent(this, AppActivity.class);
startActivity(intent);
}
}
package sk.tomino.login;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
public class PoznamkaFragment extends Fragment
{
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View v = inflater.inflate(R.layout.poznamka_frag, container, false);
return v;
}
public static PoznamkaFragment newInstance() {
PoznamkaFragment f = new PoznamkaFragment();
return f;
}
}
package sk.tomino.login;
import android.app.Application;
import android.content.ContentValues;
import android.content.Context;
import android.database.Cursor;
import android.database.SQLException;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteOpenHelper;
public class DatabaseOp extends Application
{
protected static final String DATABASE_NAME = "student_diar";
protected static final int DATABASE_VERSION = 1;
private static final String DATABASE_CREATE =
"CREATE TABLE user (meno varchar NOT NULL, heslo varchar NOT NULL,CONSTRAINT Key1 PRIMARY KEY (meno));"
+ "CREATE TABLE udalost (id int NOT NULL ,meno varchar NOT NULL, typ int NOT NULL, nazov varchar NOT NULL,"
+ "datum date NOT NULL, poznamka varchar, hodina time, dlzka int, poloha varchar,"
+ "CONSTRAINT Key6 PRIMARY KEY (id,meno),CONSTRAINT ma FOREIGN KEY (meno) REFERENCES User (meno));";
private final Context mCtx;
private SQLiteDatabase mDb;
private DatabaseHelper mDbHelper;
private static class DatabaseHelper extends SQLiteOpenHelper {
DatabaseHelper(Context context) {
super(context, DATABASE_NAME, null, DATABASE_VERSION);
}
@Override
public void onCreate(SQLiteDatabase db)
{
db.execSQL(DATABASE_CREATE);
}
@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion)
{
db.execSQL("DROP TABLE IF EXISTS udalost, user");
onCreate(db);
}
}
public DatabaseOp(Context ctx) {
this.mCtx = ctx;
}
public DatabaseOp open () throws SQLException
{
mDbHelper = new DatabaseHelper (mCtx);
mDb = mDbHelper.getWritableDatabase();
return this;
}
public void close()
{
mDbHelper.close();
}
public long createNote (String nazov, String poznamka)
{
ContentValues initialValues = new ContentValues ();
initialValues.put("nazov", nazov);
initialValues.put("poznamka", poznamka);
//initialValues.put("typ", typ);
return mDb.insert("udalost", null, initialValues);
}
public boolean deleteNote (long rowId)
{
return mDb.delete("udalost", "id"+"="+rowId, null) > 0;
}
public Cursor fetchAllNotes ()
{
return mDb.rawQuery("select * from udalost;", null);
//return mDb.rawQuery("select * from udalost where typ = 2;", null);
}
public Cursor fetchNote(long rowId) throws SQLException
{
Cursor mCursor = mDb.rawQuery("select * from udalost where id = "+rowId+";", null);
if (mCursor != null)
{
mCursor.moveToFirst();
}
return mCursor;
}
public boolean updateNote(long rowId, String nazov, String poznamka)
{
ContentValues args = new ContentValues();
args.put("nazov", nazov);
args.put("poznamka", poznamka);
return mDb.update("udalost", args, "id" + "=" + rowId, null) > 0;
}
}
PoznamkaFragment.java
package sk.tomino.login;
import java.util.Locale;
import sk.tomino.login.NastaveniaActivity;
import android.content.Intent;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentActivity;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentPagerAdapter;
import android.support.v4.view.ViewPager;
import android.view.Menu;
import android.view.MenuItem;
import android.widget.Toast;
public class MainActivity extends FragmentActivity {
public static final String PREZIVKA = "prezivka";
MyPagerAdapter mMyPagerAdapter;
ViewPager mViewPager;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Intent i = getIntent();
String prezivka = getResources().getString(R.string.logged)+" "+i.getStringExtra(PREZIVKA);
if (prezivka.length()>0)
Toast.makeText (this, prezivka, Toast.LENGTH_SHORT).show();
mMyPagerAdapter = new MyPagerAdapter(
getSupportFragmentManager());
mViewPager = (ViewPager) findViewById(R.id.pager);
mViewPager.setAdapter(mMyPagerAdapter);
}
@Override
public boolean onCreateOptionsMenu(Menu menu)
{
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
/**
* A {@link FragmentPagerAdapter} that returns a fragment corresponding to
* one of the sections/tabs/pages.
*/
public class MyPagerAdapter extends FragmentPagerAdapter {
public MyPagerAdapter(FragmentManager fm) {
super(fm);
}
@Override
public Fragment getItem(int position) {
switch(position){
case 0:
return UlohaFragment.newInstance();
case 1:
return PredmetFragment.newInstance();
case 2:
return PoznamkaFragment.newInstance();
case 3:
return SviatokFragment.newInstance();
default:
return UlohaFragment.newInstance();
}
}
@Override
public int getCount() {
// Show 4 total pages.
return 4;
}
@Override
public CharSequence getPageTitle(int position) {
Locale l = Locale.getDefault();
switch (position) {
case 0:
return getString(R.string.title_section1).toUpperCase(l);
case 1:
return getString(R.string.title_section2).toUpperCase(l);
case 2:
return getString(R.string.title_section3).toUpperCase(l);
case 3:
return getString(R.string.title_section4).toUpperCase(l);
}
return null;
}
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle presses on the action bar items
switch (item.getItemId()) {
case R.id.action_pridat:
openPridaj();
return true;
case R.id.action_hladat:
openHladaj();
return true;
case R.id.action_settings:
openSettings();
return true;
case R.id.action_app:
openApp();
return true;
default:
return super.onOptionsItemSelected(item);
}
}
public void openPridaj()
{
Intent intent = new Intent(this, PridajActivity.class);
startActivity(intent);
}
public void openHladaj()
{
Intent intent = new Intent(this, HladajActivity.class);
startActivity(intent);
}
public void openSettings()
{
Intent intent = new Intent(this, NastaveniaActivity.class);
startActivity(intent);
}
public void openApp()
{
Intent intent = new Intent(this, AppActivity.class);
startActivity(intent);
}
}
package sk.tomino.login;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
public class PoznamkaFragment extends Fragment
{
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View v = inflater.inflate(R.layout.poznamka_frag, container, false);
return v;
}
public static PoznamkaFragment newInstance() {
PoznamkaFragment f = new PoznamkaFragment();
return f;
}
}
package sk.tomino.login;
import android.app.Application;
import android.content.ContentValues;
import android.content.Context;
import android.database.Cursor;
import android.database.SQLException;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteOpenHelper;
public class DatabaseOp extends Application
{
protected static final String DATABASE_NAME = "student_diar";
protected static final int DATABASE_VERSION = 1;
private static final String DATABASE_CREATE =
"CREATE TABLE user (meno varchar NOT NULL, heslo varchar NOT NULL,CONSTRAINT Key1 PRIMARY KEY (meno));"
+ "CREATE TABLE udalost (id int NOT NULL ,meno varchar NOT NULL, typ int NOT NULL, nazov varchar NOT NULL,"
+ "datum date NOT NULL, poznamka varchar, hodina time, dlzka int, poloha varchar,"
+ "CONSTRAINT Key6 PRIMARY KEY (id,meno),CONSTRAINT ma FOREIGN KEY (meno) REFERENCES User (meno));";
private final Context mCtx;
private SQLiteDatabase mDb;
private DatabaseHelper mDbHelper;
private static class DatabaseHelper extends SQLiteOpenHelper {
DatabaseHelper(Context context) {
super(context, DATABASE_NAME, null, DATABASE_VERSION);
}
@Override
public void onCreate(SQLiteDatabase db)
{
db.execSQL(DATABASE_CREATE);
}
@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion)
{
db.execSQL("DROP TABLE IF EXISTS udalost, user");
onCreate(db);
}
}
public DatabaseOp(Context ctx) {
this.mCtx = ctx;
}
public DatabaseOp open () throws SQLException
{
mDbHelper = new DatabaseHelper (mCtx);
mDb = mDbHelper.getWritableDatabase();
return this;
}
public void close()
{
mDbHelper.close();
}
public long createNote (String nazov, String poznamka)
{
ContentValues initialValues = new ContentValues ();
initialValues.put("nazov", nazov);
initialValues.put("poznamka", poznamka);
//initialValues.put("typ", typ);
return mDb.insert("udalost", null, initialValues);
}
public boolean deleteNote (long rowId)
{
return mDb.delete("udalost", "id"+"="+rowId, null) > 0;
}
public Cursor fetchAllNotes ()
{
return mDb.rawQuery("select * from udalost;", null);
//return mDb.rawQuery("select * from udalost where typ = 2;", null);
}
public Cursor fetchNote(long rowId) throws SQLException
{
Cursor mCursor = mDb.rawQuery("select * from udalost where id = "+rowId+";", null);
if (mCursor != null)
{
mCursor.moveToFirst();
}
return mCursor;
}
public boolean updateNote(long rowId, String nazov, String poznamka)
{
ContentValues args = new ContentValues();
args.put("nazov", nazov);
args.put("poznamka", poznamka);
return mDb.update("udalost", args, "id" + "=" + rowId, null) > 0;
}
}
DatabaseOp.java
package sk.tomino.login;
import java.util.Locale;
import sk.tomino.login.NastaveniaActivity;
import android.content.Intent;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentActivity;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentPagerAdapter;
import android.support.v4.view.ViewPager;
import android.view.Menu;
import android.view.MenuItem;
import android.widget.Toast;
public class MainActivity extends FragmentActivity {
public static final String PREZIVKA = "prezivka";
MyPagerAdapter mMyPagerAdapter;
ViewPager mViewPager;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Intent i = getIntent();
String prezivka = getResources().getString(R.string.logged)+" "+i.getStringExtra(PREZIVKA);
if (prezivka.length()>0)
Toast.makeText (this, prezivka, Toast.LENGTH_SHORT).show();
mMyPagerAdapter = new MyPagerAdapter(
getSupportFragmentManager());
mViewPager = (ViewPager) findViewById(R.id.pager);
mViewPager.setAdapter(mMyPagerAdapter);
}
@Override
public boolean onCreateOptionsMenu(Menu menu)
{
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
/**
* A {@link FragmentPagerAdapter} that returns a fragment corresponding to
* one of the sections/tabs/pages.
*/
public class MyPagerAdapter extends FragmentPagerAdapter {
public MyPagerAdapter(FragmentManager fm) {
super(fm);
}
@Override
public Fragment getItem(int position) {
switch(position){
case 0:
return UlohaFragment.newInstance();
case 1:
return PredmetFragment.newInstance();
case 2:
return PoznamkaFragment.newInstance();
case 3:
return SviatokFragment.newInstance();
default:
return UlohaFragment.newInstance();
}
}
@Override
public int getCount() {
// Show 4 total pages.
return 4;
}
@Override
public CharSequence getPageTitle(int position) {
Locale l = Locale.getDefault();
switch (position) {
case 0:
return getString(R.string.title_section1).toUpperCase(l);
case 1:
return getString(R.string.title_section2).toUpperCase(l);
case 2:
return getString(R.string.title_section3).toUpperCase(l);
case 3:
return getString(R.string.title_section4).toUpperCase(l);
}
return null;
}
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle presses on the action bar items
switch (item.getItemId()) {
case R.id.action_pridat:
openPridaj();
return true;
case R.id.action_hladat:
openHladaj();
return true;
case R.id.action_settings:
openSettings();
return true;
case R.id.action_app:
openApp();
return true;
default:
return super.onOptionsItemSelected(item);
}
}
public void openPridaj()
{
Intent intent = new Intent(this, PridajActivity.class);
startActivity(intent);
}
public void openHladaj()
{
Intent intent = new Intent(this, HladajActivity.class);
startActivity(intent);
}
public void openSettings()
{
Intent intent = new Intent(this, NastaveniaActivity.class);
startActivity(intent);
}
public void openApp()
{
Intent intent = new Intent(this, AppActivity.class);
startActivity(intent);
}
}
package sk.tomino.login;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
public class PoznamkaFragment extends Fragment
{
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View v = inflater.inflate(R.layout.poznamka_frag, container, false);
return v;
}
public static PoznamkaFragment newInstance() {
PoznamkaFragment f = new PoznamkaFragment();
return f;
}
}
package sk.tomino.login;
import android.app.Application;
import android.content.ContentValues;
import android.content.Context;
import android.database.Cursor;
import android.database.SQLException;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteOpenHelper;
public class DatabaseOp extends Application
{
protected static final String DATABASE_NAME = "student_diar";
protected static final int DATABASE_VERSION = 1;
private static final String DATABASE_CREATE =
"CREATE TABLE user (meno varchar NOT NULL, heslo varchar NOT NULL,CONSTRAINT Key1 PRIMARY KEY (meno));"
+ "CREATE TABLE udalost (id int NOT NULL ,meno varchar NOT NULL, typ int NOT NULL, nazov varchar NOT NULL,"
+ "datum date NOT NULL, poznamka varchar, hodina time, dlzka int, poloha varchar,"
+ "CONSTRAINT Key6 PRIMARY KEY (id,meno),CONSTRAINT ma FOREIGN KEY (meno) REFERENCES User (meno));";
private final Context mCtx;
private SQLiteDatabase mDb;
private DatabaseHelper mDbHelper;
private static class DatabaseHelper extends SQLiteOpenHelper {
DatabaseHelper(Context context) {
super(context, DATABASE_NAME, null, DATABASE_VERSION);
}
@Override
public void onCreate(SQLiteDatabase db)
{
db.execSQL(DATABASE_CREATE);
}
@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion)
{
db.execSQL("DROP TABLE IF EXISTS udalost, user");
onCreate(db);
}
}
public DatabaseOp(Context ctx) {
this.mCtx = ctx;
}
public DatabaseOp open () throws SQLException
{
mDbHelper = new DatabaseHelper (mCtx);
mDb = mDbHelper.getWritableDatabase();
return this;
}
public void close()
{
mDbHelper.close();
}
public long createNote (String nazov, String poznamka)
{
ContentValues initialValues = new ContentValues ();
initialValues.put("nazov", nazov);
initialValues.put("poznamka", poznamka);
//initialValues.put("typ", typ);
return mDb.insert("udalost", null, initialValues);
}
public boolean deleteNote (long rowId)
{
return mDb.delete("udalost", "id"+"="+rowId, null) > 0;
}
public Cursor fetchAllNotes ()
{
return mDb.rawQuery("select * from udalost;", null);
//return mDb.rawQuery("select * from udalost where typ = 2;", null);
}
public Cursor fetchNote(long rowId) throws SQLException
{
Cursor mCursor = mDb.rawQuery("select * from udalost where id = "+rowId+";", null);
if (mCursor != null)
{
mCursor.moveToFirst();
}
return mCursor;
}
public boolean updateNote(long rowId, String nazov, String poznamka)
{
ContentValues args = new ContentValues();
args.put("nazov", nazov);
args.put("poznamka", poznamka);
return mDb.update("udalost", args, "id" + "=" + rowId, null) > 0;
}
}
- 设置包含listView的布局文件
- 将此
列表视图
以正常片段充气
- 使用
CursorAdapter
填充列表并将其设置为自定义适配器
名单
要做到这一点,请使用常用教程。您的listfragment在哪里,或者您尝试在哪里填充它?确切地说,对于listfragment,我还没有,但我使用了很多教程来填充activity fullfilling,只有开发人员提供的那种类型,因此。。。我不知道如何使用这种类型,因为您的代码中没有任何内容来填充listfragment。所以我不明白,你的问题是什么。