Java Android ListView不显示数据库信息
以上附件是该问题的截图。不会使用数据库的信息更新： XML文件Java Android ListView不显示数据库信息,java,android,database,sqlite,listview,Java,Android,Database,Sqlite,Listview,以上附件是该问题的截图。不会使用数据库的信息更新： XML文件 <?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:id="@+id/catChooser" android:layout_width
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/catChooser"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical" >
<Spinner
android:id="@+id/categoryChoose"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginTop="5dip"
android:entries="@array/catergory_arrays"
android:gravity="right" />
<ListView
android:id="@+id/dbListView"
android:layout_width="match_parent"
android:layout_height="400dp"
android:layout_marginTop="10dip" >
</ListView>
<Button
android:id="@+id/scanCurrent"
android:layout_width="match_parent"
android:layout_height="50dp"
android:layout_marginTop="10dip"
android:text="@string/scan" />
<Button
android:id="@+id/editItemCurrent"
android:layout_width="match_parent"
android:layout_height="50dp"
android:layout_marginBottom="10dp"
android:text="@string/editItem" />
</LinearLayout>
package com.example.fooditemmonitor;
import java.util.ArrayList;
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;
import android.util.Log;
public final class ItemDatabase {
// the Activity or Application that is creating an object from this class.
Context context;
// a reference to the database used by this application/object
private SQLiteDatabase db;
// These constants are specific to the database.
private final String DATABASE_NAME = "ItemDatabase.sqlite";
private final int DATABASE_VERSION = 3;
// These constants are specific to the database table.
private final String TABLE_NAME = "foodItems";
private final String COLUMN_NAME_ENTRY_ID = "entryid";
private final String COLUMN_NAME_BARCODE = "barcode";
private final String COLUMN_NAME_TITLE = "title";
private final String COLUMN_NAME_QUANTITY = "quantity";
private final String COLUMN_NAME_DATE = "date";
String SQL_DELETE_ENTRIES = "DROP TABLE IF EXISTS " + TABLE_NAME;
String SQL_CREATE_TABLE = "create table " + TABLE_NAME + " ("
+ COLUMN_NAME_ENTRY_ID
+ " integer primary key autoincrement not null," + COLUMN_NAME_DATE
+ " date," + COLUMN_NAME_BARCODE + " text," + COLUMN_NAME_TITLE
+ " text," + COLUMN_NAME_QUANTITY + " int" + ");";
public ItemDatabase(Context context) {
this.context = context;
// create or open the database
ItemDatabaseHelper helper = new ItemDatabaseHelper(context);
this.db = helper.getWritableDatabase();
}
public void addRow(String rowStringOne, String rowStringTwo,
String rowStringThree, int rowIntFour) {
// this is a key value pair holder used by android's SQLite functions
ContentValues values = new ContentValues();
values.put(COLUMN_NAME_DATE, rowStringOne);
values.put(COLUMN_NAME_BARCODE, rowStringTwo);
values.put(COLUMN_NAME_TITLE, rowStringThree);
values.put(COLUMN_NAME_QUANTITY, rowIntFour);
// ask the database object to insert the new data
try {
db.insert(TABLE_NAME, null, values);
} catch (Exception e) {
Log.e("DB ERROR", e.toString());
e.printStackTrace();
}
}
public void updateRow(long rowID, String rowStringOne, String rowStringTwo,
String rowStringThree, int rowIntFour) {
// this is a key value pair holder used by android's SQLite functions
ContentValues values = new ContentValues();
values.put(COLUMN_NAME_DATE, rowStringOne);
values.put(COLUMN_NAME_BARCODE, rowStringTwo);
values.put(COLUMN_NAME_TITLE, rowStringThree);
values.put(COLUMN_NAME_QUANTITY, rowIntFour);
// ask the database object to update the database row of given rowID
try {
db.update(TABLE_NAME, values, COLUMN_NAME_ENTRY_ID + "=" + rowID,
null);
} catch (Exception e) {
Log.e("DB Error", e.toString());
e.printStackTrace();
}
}
public void deleteRow(long rowID) {
// ask the database manager to delete the row of given id
try {
db.delete(TABLE_NAME, COLUMN_NAME_ENTRY_ID + "=" + rowID, null);
} catch (Exception e) {
Log.e("DB ERROR", e.toString());
e.printStackTrace();
}
}
public ArrayList<ArrayList<Object>> getAllRowsAsArrays() {
// create an ArrayList that will hold all of the data collected from
// the database.
ArrayList<ArrayList<Object>> dataArrays = new ArrayList<ArrayList<Object>>();
// this is a database call that creates a "cursor" object.
// the cursor object store the information collected from the
// database and is used to iterate through the data.
Cursor cursor;
try {
// ask the database object to create the cursor.
cursor = db.query(TABLE_NAME, new String[] { COLUMN_NAME_DATE,
COLUMN_NAME_TITLE, COLUMN_NAME_QUANTITY }, null, null,
null, null, COLUMN_NAME_TITLE + " DESC");
// move the cursor's pointer to position zero.
cursor.moveToFirst();
// if there is data after the current cursor position, add it to the
// ArrayList.
while (cursor.moveToNext()) {
// your content
ArrayList<Object> dataList = new ArrayList<Object>();
dataList.add(cursor.getColumnIndex(COLUMN_NAME_DATE));
dataList.add(cursor.getColumnIndex(COLUMN_NAME_TITLE));
dataList.add(cursor.getColumnIndex(COLUMN_NAME_QUANTITY));
dataArrays.add(dataList);
}
} catch (SQLException e) {
Log.e("DB Error", e.toString());
e.printStackTrace();
}
// return the ArrayList that holds the data collected from the database.
return dataArrays;
}
public class ItemDatabaseHelper extends SQLiteOpenHelper {
public ItemDatabaseHelper(Context context) {
super(context, DATABASE_NAME, null, DATABASE_VERSION);
}
public void onCreate(SQLiteDatabase db) {
// execute the query string to the database.
db.execSQL(SQL_CREATE_TABLE);
}
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
// This database is only a cache for online data, so its upgrade
// policy is to simply to discard the data and start over
db.execSQL(SQL_DELETE_ENTRIES);
onCreate(db);
}
}
}
package com.example.fooditemmonitor;
import java.util.ArrayList;
import android.app.Activity;
import android.content.Context;
import android.content.Intent;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuInflater;
import android.view.View;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.ListView;
public class CurrentItems extends Activity {
ItemDatabase db;
Context context;
Button addButton, editButton;
ListView listView;
// the table that displays the data
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.current_inventory);
db = new ItemDatabase(this);
// create references and listeners for the GUI interface
setupViews();
// make the buttons clicks perform actions
addButtonListeners();
displaySearch();
}
private void setupViews() {
// bring up current database items
listView = (ListView) findViewById(R.id.dbListView);
// THE BUTTONS
addButton = (Button) findViewById(R.id.scanCurrent);
editButton = (Button) findViewById(R.id.editItemCurrent);
}
private void addButtonListeners() {
addButton.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
startActivity(new Intent(CurrentItems.this, AddItem.class));
}
});
editButton.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
startActivity(new Intent(CurrentItems.this, EditItems.class));
}
});
}
private void displaySearch() {
// TODO Auto-generated method stub
ArrayList<ArrayList<Object>> data = db.getAllRowsAsArrays();
final ArrayList<String> items = new ArrayList<String>();
final ArrayAdapter<String> aa;
aa = new ArrayAdapter<String>(this,
android.R.layout.simple_list_item_1, items);
for (int position = 0; position < data.size(); position++) {
ArrayList<Object> row = data.get(position);
items.add("\nDate:" + row.get(0).toString() + " Title:"
+ row.get(1).toString() + "\n" + "Quantity:"
+ Integer.parseInt(row.get(2).toString()) + "\n");
aa.notifyDataSetChanged();
}
listView.setAdapter(aa);
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
MenuInflater inflater = getMenuInflater();
inflater.inflate(R.menu.main, menu);
return super.onCreateOptionsMenu(menu);
}
}
package com.example.foodeTommonitor；
导入java.util.ArrayList；
导入android.app.Activity；
导入android.content.Context；
导入android.content.Intent；
导入android.os.Bundle；
导入android.view.Menu；
导入android.view.MenuInflater；
导入android.view.view；
导入android.widget.ArrayAdapter；
导入android.widget.Button；
导入android.widget.ListView；
公共类CurrentItems扩展活动{
项目数据库数据库；
语境；
按钮addButton，editButton；
列表视图列表视图；
//显示数据的表
@凌驾
创建时的公共void（Bundle savedInstanceState）{
super.onCreate（savedInstanceState）；
setContentView（R.layout.current_inventory）；
db=新的项目数据库（此）；
//为GUI界面创建引用和侦听器
setupview（）；
//使按钮单击执行操作
addButtonListeners（）；
displaySearch（）；
}
私有void setupViews（）{
//调出当前数据库项
listView=（listView）findViewById（R.id.dbListView）；
//按钮
addButton=（按钮）findViewById（R.id.scanCurrent）；
editButton=（按钮）findViewById（R.id.editItemCurrent）；
}
私有void addButtonListeners（）{
addButton.setOnClickListener（新视图.OnClickListener（）{
@凌驾
公共void onClick（视图v）{
startActivity（新意图（CurrentItems.this，AddItem.class））；
}
});
editButton.setOnClickListener（新视图.OnClickListener（）{
@凌驾
公共void onClick（视图v）{
startActivity（新意图（CurrentItems.this、EditItems.class））；
}
});
}
私有void displaySearch（）{
//TODO自动生成的方法存根
ArrayList data=db.getAllrowsaArrays（）；
最终ArrayList项=新ArrayList（）；
最终阵列适配器aa；
aa=新阵列适配器（此，
android.R.layout.simple_list_item_1，items）；
对于（int position=0；position<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/catChooser"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical" >
<Spinner
android:id="@+id/categoryChoose"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginTop="5dip"
android:entries="@array/catergory_arrays"
android:gravity="right" />
<ListView
android:id="@+id/dbListView"
android:layout_width="match_parent"
android:layout_height="400dp"
android:layout_marginTop="10dip" >
</ListView>
<Button
android:id="@+id/scanCurrent"
android:layout_width="match_parent"
android:layout_height="50dp"
android:layout_marginTop="10dip"
android:text="@string/scan" />
<Button
android:id="@+id/editItemCurrent"
android:layout_width="match_parent"
android:layout_height="50dp"
android:layout_marginBottom="10dp"
android:text="@string/editItem" />
</LinearLayout>
package com.example.fooditemmonitor;
import java.util.ArrayList;
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;
import android.util.Log;
public final class ItemDatabase {
// the Activity or Application that is creating an object from this class.
Context context;
// a reference to the database used by this application/object
private SQLiteDatabase db;
// These constants are specific to the database.
private final String DATABASE_NAME = "ItemDatabase.sqlite";
private final int DATABASE_VERSION = 3;
// These constants are specific to the database table.
private final String TABLE_NAME = "foodItems";
private final String COLUMN_NAME_ENTRY_ID = "entryid";
private final String COLUMN_NAME_BARCODE = "barcode";
private final String COLUMN_NAME_TITLE = "title";
private final String COLUMN_NAME_QUANTITY = "quantity";
private final String COLUMN_NAME_DATE = "date";
String SQL_DELETE_ENTRIES = "DROP TABLE IF EXISTS " + TABLE_NAME;
String SQL_CREATE_TABLE = "create table " + TABLE_NAME + " ("
+ COLUMN_NAME_ENTRY_ID
+ " integer primary key autoincrement not null," + COLUMN_NAME_DATE
+ " date," + COLUMN_NAME_BARCODE + " text," + COLUMN_NAME_TITLE
+ " text," + COLUMN_NAME_QUANTITY + " int" + ");";
public ItemDatabase(Context context) {
this.context = context;
// create or open the database
ItemDatabaseHelper helper = new ItemDatabaseHelper(context);
this.db = helper.getWritableDatabase();
}
public void addRow(String rowStringOne, String rowStringTwo,
String rowStringThree, int rowIntFour) {
// this is a key value pair holder used by android's SQLite functions
ContentValues values = new ContentValues();
values.put(COLUMN_NAME_DATE, rowStringOne);
values.put(COLUMN_NAME_BARCODE, rowStringTwo);
values.put(COLUMN_NAME_TITLE, rowStringThree);
values.put(COLUMN_NAME_QUANTITY, rowIntFour);
// ask the database object to insert the new data
try {
db.insert(TABLE_NAME, null, values);
} catch (Exception e) {
Log.e("DB ERROR", e.toString());
e.printStackTrace();
}
}
public void updateRow(long rowID, String rowStringOne, String rowStringTwo,
String rowStringThree, int rowIntFour) {
// this is a key value pair holder used by android's SQLite functions
ContentValues values = new ContentValues();
values.put(COLUMN_NAME_DATE, rowStringOne);
values.put(COLUMN_NAME_BARCODE, rowStringTwo);
values.put(COLUMN_NAME_TITLE, rowStringThree);
values.put(COLUMN_NAME_QUANTITY, rowIntFour);
// ask the database object to update the database row of given rowID
try {
db.update(TABLE_NAME, values, COLUMN_NAME_ENTRY_ID + "=" + rowID,
null);
} catch (Exception e) {
Log.e("DB Error", e.toString());
e.printStackTrace();
}
}
public void deleteRow(long rowID) {
// ask the database manager to delete the row of given id
try {
db.delete(TABLE_NAME, COLUMN_NAME_ENTRY_ID + "=" + rowID, null);
} catch (Exception e) {
Log.e("DB ERROR", e.toString());
e.printStackTrace();
}
}
public ArrayList<ArrayList<Object>> getAllRowsAsArrays() {
// create an ArrayList that will hold all of the data collected from
// the database.
ArrayList<ArrayList<Object>> dataArrays = new ArrayList<ArrayList<Object>>();
// this is a database call that creates a "cursor" object.
// the cursor object store the information collected from the
// database and is used to iterate through the data.
Cursor cursor;
try {
// ask the database object to create the cursor.
cursor = db.query(TABLE_NAME, new String[] { COLUMN_NAME_DATE,
COLUMN_NAME_TITLE, COLUMN_NAME_QUANTITY }, null, null,
null, null, COLUMN_NAME_TITLE + " DESC");
// move the cursor's pointer to position zero.
cursor.moveToFirst();
// if there is data after the current cursor position, add it to the
// ArrayList.
while (cursor.moveToNext()) {
// your content
ArrayList<Object> dataList = new ArrayList<Object>();
dataList.add(cursor.getColumnIndex(COLUMN_NAME_DATE));
dataList.add(cursor.getColumnIndex(COLUMN_NAME_TITLE));
dataList.add(cursor.getColumnIndex(COLUMN_NAME_QUANTITY));
dataArrays.add(dataList);
}
} catch (SQLException e) {
Log.e("DB Error", e.toString());
e.printStackTrace();
}
// return the ArrayList that holds the data collected from the database.
return dataArrays;
}
public class ItemDatabaseHelper extends SQLiteOpenHelper {
public ItemDatabaseHelper(Context context) {
super(context, DATABASE_NAME, null, DATABASE_VERSION);
}
public void onCreate(SQLiteDatabase db) {
// execute the query string to the database.
db.execSQL(SQL_CREATE_TABLE);
}
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
// This database is only a cache for online data, so its upgrade
// policy is to simply to discard the data and start over
db.execSQL(SQL_DELETE_ENTRIES);
onCreate(db);
}
}
}
package com.example.foodeTommonitor；
导入java.util.ArrayList；
导入android.content.ContentValues；
导入android.content.Context；
导入android.database.Cursor；
导入android.database.SQLException；
导入android.database.sqlite.SQLiteDatabase；
导入android.database.sqlite.SQLiteOpenHelper；
导入android.util.Log；
公共最终类项目数据库{
//正在从此类创建对象的活动或应用程序。
语境；
//此应用程序/对象使用的数据库的引用
专用数据库数据库；
//这些常量特定于数据库。
私有最终字符串数据库\u NAME=“ItemDatabase.sqlite”；
私有最终int数据库_版本=3；
//这些常量特定于数据库表。
私有最终字符串表\u NAME=“foodItems”；
私有最终字符串列\u NAME\u ENTRY\u ID=“entryid”；
私有最终字符串列\u NAME\u BARCODE=“BARCODE”；
私有最终字符串列\u NAME\u TITLE=“TITLE”；
私有最终字符串列\u NAME\u QUANTITY=“QUANTITY”；
私有最终字符串列\u NAME\u DATE=“DATE”；
字符串SQL\u DELETE\u ENTRIES=“如果存在，则删除表格”+表格名称；
字符串SQL\u CREATE\u TABLE=“CREATE TABLE”+TABLE\u NAME+”（“
+列\u名称\u条目\u ID
+“整型主键自动递增不为空，”+列\u名称\u日期
+“日期”+“列名称”+“条形码”+“文本”+“列名称”\u标题
+“文本，“+列名称\数量+”整数“+”；
公共项目数据库（上下文）{
this.context=上下文；
//创建或打开数据库
ItemDatabaseHelper=新的ItemDatabaseHelper（上下文）；
this.db=helper.getWritableDatabase（）；
}
public void addRow（字符串rowStringOne、字符串rowStringTwo、，
字符串行三，整数行四）{
//这是android的SQLite函数使用的键值对持有者
ContentValues=新的ContentValues（）；
value.put（列\名称\日期，rowStringOne）；
value.put（列\名称\条形码，第二行）；
value.put（列\名称\标题，第三行）；
value.put（列\名称\数量，第四行）；
//要求数据库对象插入新数据
试一试{
db.insert（表名称，空，值）；
}捕获（例外e）{
Log.e（“DB ERROR”，e.toString（））；
e、 printStackTrace（）；
}
}
public void updateRow（长rowID、字符串rowStringOne、字符串rowStringTwo、，
字符串行三，整数行四）{
//这是android的SQLite函数使用的键值对持有者
ContentValues=新的ContentValues（）；
value.put（列\名称\日期，rowStringOne）；
value.put（列\名称\条形码，第二行）；
value.put（列名称