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這是我的數據庫代碼，我想從我的數據庫檢索名稱，並顯示它在另一個Java文件下面列出的另一個java文件profilelist.jar。但我不能做到PLZ告訴我這個代碼是否正確？在數據庫中顯示數據在列表視圖
package a.vaccination;
import android.annotation.TargetApi;
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.os.Build;
import android.util.Log;
@TargetApi(Build.VERSION_CODES.JELLY_BEAN)
public class datahandler {
public static final String KEY_ROWID = "id";
public static final String KEY_name = "name";
public static final String KEY_dob = "dob";
public static final String KEY_contact = "contact";
public static final String KEY_email = "email";
private static final String TAG = "DBAdapter";
private static final String DATABASE_NAME = "profile";
private static final String DATABASE_TABLE = "baby";
private static final int DATABASE_VERSION = 2;
private static final String DATABASE_CREATE = "create table if not exists"
+ DATABASE_TABLE
+ "(id integer primary key autoincrement, "
+ "name VARCHAR not null, dob date, contact VARCHAR, email
VARCHAR);";
private final Context context;
private DatabaseHelper DBHelper;
private SQLiteDatabase db;
public datahandler(Context ctx) {
this.context = ctx;
DBHelper = new DatabaseHelper(context);
}
protected static class DatabaseHelper extends SQLiteOpenHelper {
DatabaseHelper(Context context) {
super(context, DATABASE_NAME, null, DATABASE_VERSION);
}
@Override
public void onCreate(SQLiteDatabase db) {
// TODO Auto-generated method stub
try {
db.execSQL(DATABASE_CREATE);
// db = DBHelper.getWritableDatabase();
Log.i(DATABASE_NAME, "create");
} catch (SQLException e) {
e.printStackTrace();
}
}
@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
// TODO Auto-generated method stub
Log.w(TAG, "Upgrading database from version " + oldVersion + " to "
+ newVersion + ", which will destroy all old
data");
db.execSQL("DROP TABLE IF EXISTS contacts");
onCreate(db);
}
}
// ---opens the database---
public datahandler open() throws SQLException {
db = DBHelper.getWritableDatabase();
return this;
}
// ---closes the database---
public void close() {
DBHelper.close();
}
// ---insert a record into the database---
public long insertRecord(String name, String dob, String contact,
String email) {
ContentValues initialValues = new ContentValues();
initialValues.put(KEY_name, name);
initialValues.put(KEY_dob, dob);
initialValues.put(KEY_contact, contact);
initialValues.put(KEY_email, email);
Log.i(DATABASE_NAME, "values added");
return db.insert(DATABASE_TABLE, null, initialValues);
}
// ---updates a record---
public boolean updateRecord(long rowId, String name, String dob,
String contact, String email) {
ContentValues args = new ContentValues();
args.put(KEY_name, name);
args.put(KEY_dob, dob);
args.put(KEY_contact, contact);
args.put(KEY_email, email);
return db.update(DATABASE_TABLE, args, KEY_ROWID + "=" + rowId, null) > 0;
}
public Cursor getAllTitles() {
return db.query(DATABASE_TABLE, new String[] { KEY_ROWID, KEY_name,
KEY_dob, KEY_contact, KEY_email }, null, null, null, null,
null, null);
}
// ---retrieves a particular title---
public Cursor getTitle(long rowId) throws SQLException {
Cursor mCursor = db.query(true, DATABASE_TABLE, new String[] {
KEY_ROWID, KEY_name, KEY_email, KEY_dob, KEY_contact },
KEY_ROWID + "=" + rowId, null, null, null, null, null,
null);
if (mCursor != null) {
mCursor.moveToFirst();
}
return mCursor;
}
public void getReadableDatabase() {
// TODO Auto-generated method stub
Cursor cur = db
.rawQuery("select rowid _id,* from DATABASE_TABLE", null);
}
}
profilelist.java
package a.vaccination;
import android.app.Activity;
import android.content.Intent;
import android.database.Cursor;
import android.os.Bundle;
import android.support.v4.widget.SimpleCursorAdapter;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.Button;
import android.widget.ListView;
import android.widget.Toast;
//this shows profies of baby and option of add new one
public class profilelist extends Activity implements OnItemClickListener {
datahandler db = new datahandler(this);
SimpleCursorAdapter adapter = null;
Cursor c;
@SuppressWarnings("deprecation")
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.child);
Button add = (Button) findViewById(R.id.button1);
add.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
// navigate to create profile
Intent it = new Intent(profilelist.this,
createprofile.class);
startActivity(it);
}
});
db.open();
Cursor c = db.getAllTitles();
if (c.moveToFirst()) {
do {
DisplayRecord(c);
} while (c.moveToNext());
}
db.close();
// ---get a Record---
db.open();
c = db.getTitle(2);
if (c.moveToFirst())
DisplayRecord(c);
else
Toast.makeText(this, "No Assignments found", Toast.LENGTH_LONG)
.show();
db.close();
}
public void DisplayRecord(Cursor c) {
// TODO Auto-generated method stub
Toast.makeText(
this,
"id: " + c.getString(0) + "\n" + "name: " + c.getString(1)
+ "\n" + " dob: " + c.getString(2) +
"contact"
+ c.getString(3) + "email" +
c.getString(4),
Toast.LENGTH_SHORT).show();
String[] columns = new String[] { datahandler.KEY_name };
int[] to = new int[] { R.id.name };
adapter = new SimpleCursorAdapter(this, R.layout.child, c, columns,
to, 0);
ListView names = (ListView) findViewById(R.id.listView1);
names.setAdapter(adapter);
names.setOnItemClickListener(this);
}
我在 a.vaccination.datahandler.getTitle（datahandler.java:115） 和 了對錯誤的a.vaccination.profilelist.onCreate（ProfileList文件的.java：67） java.lang.NoSuchMethodError：android.database.sqlite.SQLiteDatabaseb.query 我提供既profilelist.java和datahandler.java以上
plz幫助我的IM嚴重這裏 @覆蓋卡住 公共無效onItemClick（適配器視圖爲arg0，ARG1觀，詮釋ARG2，長ARG3）{// TODO自動生成方法存根
Intent i = new Intent(profilelist.this, vaccination.class);
startActivity(i);
}
}
可能重複的[從SQLite數據庫填充列表視圖]（http://stackoverflow.com/questions/8656901/populating-a-listview-from- a-sqlite-database） – 2017-03-30 05:15:55