我创建了一个简单的演示，其中我只是在sqlite中存储了名字和姓氏这两个值，并在列表视图中显示。但是当我尝试两个时添加更多值，如电话no.address，state，国家等。我收到错误。它显示消息，如无法读取行和列数据。 请帮我两个添加9或10个值并在列表视图中显示。这是我的代码。
AddActivity.Java
public class AddActivity extends Activity implements OnClickListener {
private Button btn_save;
private EditText edit_first,edit_last,phoneNo;
private DbHelper mHelper;
private SQLiteDatabase dataBase;
private String id,fname,lname,pno;
private boolean isUpdate;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.add);
btn_save=(Button)findViewById(R.id.save_btn);
edit_first=(EditText)findViewById(R.id.frst_editTxt);
edit_last=(EditText)findViewById(R.id.last_editTxt);
phoneNo=(EditText)findViewById(R.id.phoneNo);
isUpdate=getIntent().getExtras().getBoolean("update");
if(isUpdate)
{
id=getIntent().getExtras().getString("ID");
fname=getIntent().getExtras().getString("Fname");
lname=getIntent().getExtras().getString("Lname");
pno=getIntent().getExtras().getString("Pno");
edit_first.setText(fname);
edit_last.setText(lname);
phoneNo.setText(pno);
}
btn_save.setOnClickListener(this);
mHelper=new DbHelper(this);
}
public void onClick(View v) {
fname=edit_first.getText().toString().trim();
lname=edit_last.getText().toString().trim();
pno=phoneNo.getText().toString().trim();
if(fname.length()>0 && lname.length()>0)
{
saveData();
}
else
{
AlertDialog.Builder alertBuilder=new AlertDialog.Builder(AddActivity.this);
alertBuilder.setTitle("Invalid Data");
alertBuilder.setMessage("Please, Enter valid data");
alertBuilder.setPositiveButton("Ok", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int which) {
dialog.cancel();
}
});
alertBuilder.create().show();
}
}
private void saveData(){
dataBase=mHelper.getWritableDatabase();
ContentValues values=new ContentValues();
values.put(DbHelper.KEY_FNAME,fname);
values.put(DbHelper.KEY_LNAME,lname );
values.put(DbHelper.KEY_PHONENO,pno );
System.out.println("");
if(isUpdate)
{
dataBase.update(DbHelper.TABLE_NAME, values, DbHelper.KEY_ID+"="+id, null);
}
else
{
dataBase.insert(DbHelper.TABLE_NAME, null, values);
}
dataBase.close();
finish();
}
}
DisplayAdapter.java
public class DisplayAdapter extends BaseAdapter {
private Context mContext;
private ArrayList<String> id;
private ArrayList<String> firstName;
private ArrayList<String> lastName;
private ArrayList<String> phoneNo;
public DisplayAdapter(Context c, ArrayList<String> id,ArrayList<String> fname, ArrayList<String> lname,ArrayList<String> pno) {
this.mContext = c;
this.id = id;
this.firstName = fname;
this.lastName = lname;
this.phoneNo = pno;
}
public int getCount() {
// TODO Auto-generated method stub
return id.size();
}
public Object getItem(int position) {
// TODO Auto-generated method stub
return null;
}
public long getItemId(int position) {
// TODO Auto-generated method stub
return 0;
}
public View getView(int pos, View child, ViewGroup parent) {
Holder mHolder;
LayoutInflater layoutInflater;
if (child == null) {
layoutInflater = (LayoutInflater) mContext.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
child = layoutInflater.inflate(R.layout.listcell, null);
mHolder = new Holder();
mHolder.txt_id = (TextView) child.findViewById(R.id.txt_id);
mHolder.txt_fName = (TextView) child.findViewById(R.id.txt_fName);
mHolder.txt_lName = (TextView) child.findViewById(R.id.txt_lName);
mHolder.phoneTextView = (TextView) child.findViewById(R.id.phoneTextView);
child.setTag(mHolder);
} else {
mHolder = (Holder) child.getTag();
}
mHolder.txt_id.setText(id.get(pos));
mHolder.txt_fName.setText(firstName.get(pos));
mHolder.txt_lName.setText(lastName.get(pos));
mHolder.phoneTextView.setText(phoneNo.get(pos));
return child;
}
public class Holder {
TextView txt_id;
TextView txt_fName;
TextView txt_lName;
TextView phoneTextView;
}
}
Database Helper.java
public class DbHelper extends SQLiteOpenHelper {
static String DATABASE_NAME="userdata";
public static final String TABLE_NAME="user";
public static final String KEY_FNAME="fname";
public static final String KEY_LNAME="lname";
public static final String KEY_PHONENO="pno";
public static final String KEY_ID="id";
public DbHelper(Context context) {
super(context, DATABASE_NAME, null, 1);
}
@Override
public void onCreate(SQLiteDatabase db) {
String CREATE_TABLE="CREATE TABLE "+TABLE_NAME+" ("+KEY_ID+" INTEGER PRIMARY KEY, "+KEY_FNAME+" TEXT, "+KEY_LNAME+" TEXT, "+KEY_PHONENO+" TEXT)";
db.execSQL(CREATE_TABLE);
}
@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
db.execSQL("DROP TABLE IF EXISTS "+TABLE_NAME);
onCreate(db);
}
}
DisplayActivity.java
public class DisplayActivity extends Activity {
private DbHelper mHelper;
private SQLiteDatabase dataBase;
private ArrayList<String> userId = new ArrayList<String>();
private ArrayList<String> user_fName = new ArrayList<String>();
private ArrayList<String> user_lName = new ArrayList<String>();
private ArrayList<String> user_phoneNo = new ArrayList<String>();
private ListView userList;
private AlertDialog.Builder build;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.display_activity);
userList = (ListView) findViewById(R.id.List);
mHelper = new DbHelper(this);
//add new record
findViewById(R.id.btnAdd).setOnClickListener(new OnClickListener() {
public void onClick(View v) {
Intent i = new Intent(getApplicationContext(), AddActivity.class);
i.putExtra("update", false);
startActivity(i);
}
});
//click to update data
userList.setOnItemClickListener(new OnItemClickListener() {
public void onItemClick(AdapterView<?> arg0, View arg1, int arg2, long arg3) {
Intent i = new Intent(getApplicationContext(), AddActivity.class);
i.putExtra("Fname", user_fName.get(arg2));
i.putExtra("Lname", user_lName.get(arg2));
i.putExtra("Lname", user_phoneNo.get(arg2));
i.putExtra("ID", userId.get(arg2));
i.putExtra("update", true);
startActivity(i);
}
});
//long click to delete data
userList.setOnItemLongClickListener(new OnItemLongClickListener() {
public boolean onItemLongClick(AdapterView<?> arg0, View arg1, final int arg2, long arg3) {
build = new AlertDialog.Builder(DisplayActivity.this);
build.setTitle("Delete " + user_fName.get(arg2) + " " + user_lName.get(arg2));
build.setMessage("Do you want to delete ?");
build.setPositiveButton("Yes",new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int which) {
Toast.makeText( getApplicationContext(),
user_fName.get(arg2) + " "
+ user_lName.get(arg2)
+user_phoneNo.get(arg2)
+ " is deleted.", 3000).show();
dataBase.delete(
DbHelper.TABLE_NAME,
DbHelper.KEY_ID + "="
+ userId.get(arg2), null);
displayData();
dialog.cancel();
}
});
build.setNegativeButton("No", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int which) {
dialog.cancel();
}
});
AlertDialog alert = build.create();
alert.show();
return true;
}
});
}
@Override
protected void onResume() {
displayData();
super.onResume();
}
/**
* displays data from SQLite
*/
private void displayData() {
dataBase = mHelper.getWritableDatabase();
Cursor mCursor = dataBase.rawQuery("SELECT * FROM " + DbHelper.TABLE_NAME, null);
userId.clear();
user_fName.clear();
user_lName.clear();
user_phoneNo.clear();
if (mCursor.moveToFirst()) {
do {
userId.add(mCursor.getString(mCursor.getColumnIndex(DbHelper.KEY_ID)));
user_fName.add(mCursor.getString(mCursor.getColumnIndex(DbHelper.KEY_FNAME)));
user_lName.add(mCursor.getString(mCursor.getColumnIndex(DbHelper.KEY_LNAME)));
user_phoneNo.add(mCursor.getString(mCursor.getColumnIndex(DbHelper.KEY_PHONENO)));
} while (mCursor.moveToNext());
}
DisplayAdapter disadpt = new DisplayAdapter(DisplayActivity.this,userId, user_fName, user_lName,user_phoneNo);
userList.setAdapter(disadpt);
mCursor.close();
}
}
答案 0 :(得分：1)
以下是从数据库中存储和获取数据的示例。
public class Database extends SQLiteOpenHelper {
public static final String KEY_ID= "id";
public static final String KEY_SURVEY_UPLOAD = "IS_SURVEY_UPLOAD";
public static final String KEY_SURVEY_COMPLETE = "IS_SURVEY_COMPLETE";
public static final String KEY_DEVICE_ID = "DEVICE_ID";
public static final String KEY_LATITUDE = "LATITUDE";
public static final String KEY_LONGITUDE = "LONGITUDE";
public static final String KEY_FILE_ID = "FILE_ID";
public static final String DATABASE_NAME = "DatabaseName";
public static final String DATABASE_TABLE_one = "Table1";
private static final String CREATE_TABLE__NUM = "create table "+DATABASE_TABLE_SURVEY+
" ("+KEY_SURVEY_COMPLETE+" TEXT,"+KEY_FILE_ID+" INTEGER,"+KEY_DEVICE_ID+" TEXT,"+KEY_LATITUDE+" TEXT, "+KEY_LONGITUDE+" TEXT, "+KEY_SURVEY_UPLOAD+" TEXT, "+KEY_SURVEYID+" INTEGER PRIMARY KEY AUTOINCREMENT )";
public Database(Context context, String name, CursorFactory factory,
int version) {
super(context, name, null, 1);
// TODO Auto-generated constructor stub
}
@Override
public void onCreate(SQLiteDatabase db) {
// TODO Auto-generated method stub
System.out.println("crteate table");
db.execSQL(CREATE_TABLE_SURVEY_CONTENT);
}
@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
// TODO Auto-generated method stub
db.execSQL("DROP TABLE IF EXISTS " + DATABASE_TABLE_one);
onCreate(db);
}
public boolean insertData(SurveyBean bean)
{
System.out.println("insert_SURVEY");
SQLiteDatabase db = this.getWritableDatabase();
ContentValues contentValues = new ContentValues();
contentValues.put(KEY_SURVEY_COMPLETE, "false");
contentValues.put(KEY_SURVEY_UPLOAD, "0");
contentValues.put(KEY_LATITUDE, bean.getLatitude());
contentValues.put(KEY_LONGITUDE, bean.getLongitude());
contentValues.put(KEY_DEVICE_ID, bean.getDeviceId());
contentValues.put(KEY_FILE_ID, Integer.getInteger(bean.getFileId()));
long id=db.insert(DATABASE_TABLE_SURVEY, null, contentValues);
System.out.println("last inserted ID"+id);
db.close();
return true;
}
public ArrayList<SurveyBean> getAllData(){
ArrayList<SurveyBean> arrayList = new ArrayList<SurveyBean>();
SQLiteDatabase db = this.getWritableDatabase();
Cursor cc = db.rawQuery("SELECT *" + " FROM " + DATABASE_TABLE_SURVEY, null);
cc.moveToFirst();
while(cc.isAfterLast() == false){
SurveyBean bean = new SurveyBean();
bean.set_isSurveyComplete(cc.getString(cc.getColumnIndex(KEY_SURVEY_COMPLETE)));
bean.set_isSurveyUpload(cc.getString(cc.getColumnIndex(KEY_SURVEY_UPLOAD)));
bean.set_surveyId(Integer.parseInt(cc.getString(cc.getColumnIndex(KEY_SURVEYID))));
bean.setDeviceId(cc.getString(cc.getColumnIndex(KEY_DEVICE_ID)));
bean.setLatitude(cc.getString(cc.getColumnIndex(KEY_LATITUDE)));
bean.setLongitude(cc.getString(cc.getColumnIndex(KEY_LONGITUDE)));
bean.setFileId(String.valueOf(cc.getInt(cc.getColumnIndex(KEY_FILE_ID))));
arrayList.add(bean);
cc.moveToNext();
}
db.close();
return arrayList ;
}
}
答案 1 :(得分：-1)
看，我做了一个简单的应用程序，从android中的sqlite数据库创建一个列表视图。看看它。它可以帮到你。
main.xml中
<?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"
>
<TextView
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="@string/hello"
/>
</LinearLayout>
DBHelper.java
import android.content.Context;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteException;
import android.database.sqlite.SQLiteOpenHelper;
public class DBHelper extends SQLiteOpenHelper{
public SQLiteDatabase DB;
public String DBPath;
public static String DBName = "testdb";
public static final int version = '1';
public static Context currentContext;
public static String tableName = "tbl_details";
public DBHelper(Context context) {
super(context, DBName, null, version);
currentContext = context;
DBPath = "/data/data/" + context.getPackageName() + "/databases";
createDatabase();
}
@Override
public void onCreate(SQLiteDatabase db) {
// TODO Auto-generated method stub
}
@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
// TODO Auto-generated method stub
}
private void createDatabase() {
boolean dbExists = checkDbExists();
if (dbExists) {
// do nothing
} else {
DB = currentContext.openOrCreateDatabase(DBName, 0, null);
DB.execSQL("CREATE TABLE IF NOT EXISTS " +
tableName +
" (LastName VARCHAR, FirstName VARCHAR," +
" Country VARCHAR, Age INT(3));");
DB.execSQL("INSERT INTO " +
tableName +
" Values ('A','vijay','India',20);");
DB.execSQL("INSERT INTO " +
tableName +
" Values ('B','ajay','Pakistan',25);");
DB.execSQL("INSERT INTO " +
tableName +
" Values ('C','suraj','Bangladesh',30);");
DB.execSQL("INSERT INTO " +
tableName +
" Values ('D','jayesh','China',35);");
DB.execSQL("INSERT INTO " +
tableName +
" Values ('E','ramesh','Nepal',40);");
DB.execSQL("INSERT INTO " +
tableName +
" Values ('F','suresh','SriLanka',45);");
}
}
private boolean checkDbExists() {
SQLiteDatabase checkDB = null;
try {
String myPath = DBPath + DBName;
checkDB = SQLiteDatabase.openDatabase(myPath, null,
SQLiteDatabase.OPEN_READONLY);
} catch (SQLiteException e) {
// database does't exist yet.
}
if (checkDB != null) {
checkDB.close();
}
return checkDB != null ? true : false;
}
}
的manifest.xml
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.ListViewFromSQLiteDB"
android:versionCode="1"
android:versionName="1.0">
<application android:icon="@drawable/icon" android:label="@string/app_name">
<activity android:name="com.example.ListViewFromSQLiteDB.DataListView"
android:label="@string/app_name">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>
</manifest>
ListViewFromSQLiteDB.java
import java.util.ArrayList;
import android.app.ListActivity;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteException;
import android.os.Bundle;
import android.util.Log;
import android.widget.ArrayAdapter;
import android.widget.TextView;
public class DataListView extends ListActivity {
private ArrayList<String> results = new ArrayList<String>();
private String tableName = DBHelper.tableName;
private SQLiteDatabase newDB;
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
openAndQueryDatabase();
displayResultList();
}
private void displayResultList() {
TextView tView = new TextView(this);
tView.setText("This data is retrieved from the database and only 4 " +
"of the results are displayed");
getListView().addHeaderView(tView);
setListAdapter(new ArrayAdapter<String>(this,
android.R.layout.simple_list_item_1, results));
getListView().setTextFilterEnabled(true);
}
private void openAndQueryDatabase() {
try {
DBHelper dbHelper = new DBHelper(this.getApplicationContext());
newDB = dbHelper.getWritableDatabase();
Cursor c = newDB.rawQuery("SELECT FirstName, Age FROM " +
tableName +
" where Age > 10 LIMIT 4", null);
if (c != null ) {
if (c.moveToFirst()) {
do {
String firstName = c.getString(c.getColumnIndex("FirstName"));
int age = c.getInt(c.getColumnIndex("Age"));
results.add("Name: " + firstName + ",Age: " + age);
}while (c.moveToNext());
}
}
} catch (SQLiteException se ) {
Log.e(getClass().getSimpleName(), "Could not create or Open the database");
} finally {
if (newDB != null)
newDB.execSQL("DELETE FROM " + tableName);
newDB.close();
}
}
}
}