我已经制作了一个基本的应用程序，其中我使用sqlite数据库来管理来宾的记录，我也使用删除功能删除条目，但使用他们的ID，所以，我想在点击后执行此操作特别是我要删除它的条目。我是android的新手，所以请帮助我，我已经尝试了很多像我的代码如下来的访客列表和plz告诉我添加到哪里使这种情况发生：这是我的数据库类
public class HotOrNot
{
public static final String KEY_ROWID = "_id";
public static final String KEY_NAME = "guest_name";
public static final String KEY_HOTNESS = "guest_address";
private static final String DATABASE_NAME = "Hotdbdb";
private static final String DATABASE_TABLE = "peopleTable";
private static final int DATABASE_VERSION = 1;
private DbHelper ourHelper;
private final Context ourContext;
private SQLiteDatabase ourDatabase;
private static class DbHelper extends SQLiteOpenHelper
{
public DbHelper(Context context)
{
super(context, DATABASE_NAME, null, DATABASE_VERSION);
}
@Override
public void onCreate(SQLiteDatabase db)
{
db.execSQL("CREATE TABLE " + DATABASE_TABLE + " (" + KEY_ROWID + " INTEGER PRIMARY KEY , " + KEY_NAME + " TEXT NOT NULL, " + KEY_HOTNESS + " TEXT NOT NULL);");
}
@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion)
{
db.execSQL("DROP TABLE IF EXITS " + DATABASE_TABLE);
onCreate(db);
}
}
public HotOrNot(Context c)
{
ourContext = c;
}
public HotOrNot open() throws SQLException
{
ourHelper = new DbHelper(ourContext);
ourDatabase = ourHelper.getWritableDatabase();
return this;
}
public void close()
{
ourHelper.close();
}
public long createEntry(String name, String hotness)
{
ContentValues cv = new ContentValues();
cv.put(KEY_NAME, name);
cv.put(KEY_HOTNESS, hotness);
return ourDatabase.insert(DATABASE_TABLE, null, cv);
}
public String getData()
{
String[] columns = new String[]{ KEY_ROWID, KEY_NAME, KEY_HOTNESS};
Cursor c = ourDatabase.query(DATABASE_TABLE, columns, null, null, null, null, null);
String result = "";
int iRow = c.getColumnIndex(KEY_ROWID);
int iName = c.getColumnIndex(KEY_NAME);
int iHotness = c.getColumnIndex(KEY_HOTNESS);
for (c.moveToFirst(); !c.isAfterLast(); c.moveToNext())
{
result = result + c.getString(iRow) + " " + c.getString(iName) + " " + c.getString(iHotness) + "\n";
}
return result;
}
public String getName(long l) {
// TODO Auto-generated method stub
String[] columns = new String[]{ KEY_ROWID, KEY_NAME, KEY_HOTNESS};
Cursor c= ourDatabase.query(DATABASE_TABLE,columns,KEY_ROWID + "=" + l, null ,null,null,null);
if(c != null){
c.moveToFirst();
String name=c.getString(1);
return name;
}
return null;
}
public String getHotness(long l) {
// TODO Auto-generated method stub
String[] columns = new String[]{ KEY_ROWID, KEY_NAME, KEY_HOTNESS};
Cursor c= ourDatabase.query(DATABASE_TABLE, columns, KEY_ROWID + "=" + l, null ,null,null,null);
if(c != null){
c.moveToFirst();
String hotness=c.getString(2);
return hotness;
}
return null;
}
public void updateEntry(long lRow, String mName, String mHotness) throws SQLException {
// TODO Auto-generated method stub
ContentValues cvUpdate=new ContentValues();
cvUpdate.put(KEY_NAME,mName);
cvUpdate.put(KEY_HOTNESS, mHotness);
ourDatabase.update(DATABASE_TABLE,cvUpdate,KEY_ROWID + "=" + lRow,null);
}
public void DeletEntry(long lRow1) throws SQLException {
// TODO Auto-generated method stub
ourDatabase.delete(DATABASE_TABLE, KEY_ROWID + "=" + lRow1, null);
}
private ListView findViewById(Object list) {
// TODO Auto-generated method stub
return null;
}
}
这是我的添加访客班级
public class add_Guest extends Activity implements OnClickListener
{
Button sqlUpdate, sqlView,sqlDelete,sqlGetInfo,sqlModify;
EditText sqlName, sqlHotness,sqlRow;
private Context context;
@Override
protected void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.add_guest);
sqlUpdate = (Button) findViewById(R.id.bSQLUpdate);
sqlName = (EditText) findViewById(R.id.etSQLName);
sqlHotness = (EditText) findViewById(R.id.etSQLHotness);
sqlView = (Button) findViewById(R.id.bSQLopenView);
Button sqlex = (Button) findViewById(R.id.bexport);
sqlView.setOnClickListener(this);
sqlUpdate.setOnClickListener(this);
sqlRow = (EditText) findViewById(R.id.etSQLrowinfo);
sqlDelete = (Button) findViewById(R.id.bSQLdelete);
sqlGetInfo= (Button) findViewById(R.id.bgetinfo);
sqlModify = (Button) findViewById(R.id.bSQLmodify);
sqlDelete.setOnClickListener(this);
sqlModify.setOnClickListener(this);
sqlGetInfo.setOnClickListener(this);
sqlex.setOnClickListener(this);
}
public void onClick(View arg0){
int id = arg0.getId();
if (id == R.id.bSQLUpdate) {
boolean didItWork = true;
try
{
String name = sqlName.getText().toString();
String hotness = sqlHotness.getText().toString();
HotOrNot entry = new HotOrNot(add_Guest.this);
entry.open();
entry.createEntry(name, hotness);
entry.close();
}
catch(Exception e )
{
didItWork = false;
String error = e.toString();
Dialog d = new Dialog(this);
d.setTitle("CATCH");
TextView tv = new TextView(this);
tv.setText(error);
d.setContentView(tv);
d.show();
}
finally
{
if (didItWork)
{
Dialog d = new Dialog(this);
d.setTitle("FINALLY");
TextView tv = new TextView(this);
tv.setText("GOOD");
d.setContentView(tv);
d.show();
}
}
} else if (id == R.id.bSQLopenView) {
Intent i = new Intent("com.example.datewithme.SQLVIEW");
startActivity(i);
} else if (id == R.id.bgetinfo) {
try{
String s = sqlRow.getText().toString();
long l= Long.parseLong(s);
HotOrNot hon=new HotOrNot(this);
hon.open();
String returnedName=hon.getName(l);
String returnedHotness=hon.getHotness(l);
hon.close();
sqlName.setText(returnedName);
sqlHotness.setText(returnedHotness);
}
catch(Exception e )
{
String error = e.toString();
Dialog d = new Dialog(this);
d.setTitle("CATCH");
TextView tv = new TextView(this);
tv.setText(error);
d.setContentView(tv);
d.show();
}
}
else if (id == R.id.bSQLmodify) {
try{String mName = sqlName.getText().toString();
String mHotness = sqlHotness.getText().toString();
String sRow = sqlRow.getText().toString();
long lRow= Long.parseLong(sRow);
HotOrNot ex=new HotOrNot(this);
ex.open();
ex.updateEntry(lRow,mName,mHotness);
ex.close();
}
catch(Exception e )
{
String error = e.toString();
Dialog d = new Dialog(this);
d.setTitle("CATCH");
TextView tv = new TextView(this);
tv.setText(error);
d.setContentView(tv);
d.show();
}
} else if (id == R.id.bSQLdelete){
try{ String sRow1 = sqlRow.getText().toString();
long lRow1= Long.parseLong(sRow1);
HotOrNot ex1=new HotOrNot(this);
ex1.open();
ex1.DeletEntry(lRow1);
ex1.close();
}
catch(Exception e )
{
String error = e.toString();
Dialog d = new Dialog(this);
d.setTitle("CATCH");
TextView tv = new TextView(this);
tv.setText(error);
d.setContentView(tv);
d.show();
}
}
}
}