您好,我對Android開發甚至Java非常陌生,我做了一個應用程序,該應用程序應該連接到SQLite數據庫並能夠插入更新,顯示和刪除數據。到目前爲止,我可以插入數據並將其顯示在列表視圖中。從這裏我的計劃是有兩個按鈕在listview的每個項目中刪除和一個更新,但我努力獲得按鈕的工作任何幫助,將不勝感激謝謝。更新和刪除ListView中的SQLite行
這個活動是什麼需要輸入和插入行我的表
package com.example.votesmart2;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
import com.example.votesmart2.FeedReaderContract.FeedEntry;
import android.os.Bundle;
import android.app.Activity;
import android.content.ContentValues;
import android.content.Intent;
import android.database.sqlite.SQLiteDatabase;
import android.view.Menu;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
public class Zip extends Activity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.zip);
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.zip, menu);
return true;
}
public void onSubmit(View view){
System.out.println("button just pressed");
FeedReaderDbHelper mDbHelper = new FeedReaderDbHelper(getApplicationContext());
System.out.println("database class instantized/database created");
EditText first = (EditText)findViewById(R.id.fname_input);
String finalFirst = first.getText().toString();
EditText last = (EditText)findViewById(R.id.lname_input);
String finalLast = last.getText().toString();
EditText zip = (EditText)findViewById(R.id.zipcode_input);
int finalZip = Integer.parseInt(zip.getText().toString());
EditText age = (EditText)findViewById(R.id.age_input);
int finalAge =Integer.parseInt(age.getText().toString());
EditText sex = (EditText)findViewById(R.id.sex_input);
String finalSex = sex.getText().toString();
System.out.println("gets all data from edit text");
SQLiteDatabase db = mDbHelper.getWritableDatabase();
System.out.println("got writable database");
ContentValues values = new ContentValues();
values.putNull(FeedEntry._ID);
values.put(FeedEntry.col_first, finalFirst);
values.put(FeedEntry.col_last, finalLast);
values.put(FeedEntry.col_zip, finalZip);
values.put(FeedEntry.col_age, finalAge);
values.put(FeedEntry.col_sex, finalSex);
long newRowId = db.insert(FeedEntry.table_name, null, values);
Intent intent = new Intent(Zip.this, EditProfile.class);
startActivity(intent);
}
}
這是一個顯示我的數據的活動
package com.example.votesmart2;
import java.util.ArrayList;
import java.util.List;
import com.example.votesmart2.FeedReaderContract.FeedEntry;
import android.app.Activity;
import android.app.ListActivity;
import android.content.Intent;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;
import android.os.Bundle;
import android.view.Menu;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.ListView;
import android.widget.TextView;
public class EditProfile extends ListActivity {
protected void onCreate(Bundle savedInstanceState) {
System.out.println("onCreate begins");
super.onCreate(savedInstanceState);
setContentView(R.layout.editprofile);
Intent intent = getIntent();
System.out.println("intent received");
FeedReaderDbHelper feedReaderDbHelper = new FeedReaderDbHelper(this);
System.out.println("istantiate db class");
ListView listView = (ListView)findViewById(R.id.list);
System.out.println("list view declared");
ListAdapter listAdapter = new ListAdapter(this, feedReaderDbHelper.getRecords());
System.out.println("running of select query complete");
listView.setAdapter(listAdapter);
System.out.println("values sent to adapter for listview formatting");
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.zip, menu);
return true;
}
/*public void onDelete(View view){
DeleteRecord deleteRecord = new DeleteRecord();
deleteRecord.deleteRecord(null);
Intent i = new Intent(EditProfile.this, EditProfile.class); //your class
startActivity(i);
finish();
}*/
public void onUpdate(View view){
}
}
這是我的適配器
package com.example.votesmart2;
import com.example.votesmart2.FeedReaderContract.FeedEntry;
import android.content.Context;
import android.content.Intent;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;
import android.view.LayoutInflater;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.ViewGroup;
import android.widget.Button;
import android.widget.CursorAdapter;
import android.widget.ImageButton;
import android.widget.TextView;
public class ListAdapter extends CursorAdapter{
public ListAdapter(Context context, Cursor cursor){
super(context, cursor);
}
@Override
public void bindView(View view, final Context context, Cursor cursor) {
// TODO Auto-generated method stub
TextView nameTextView = (TextView) view.findViewById(R.id.first_view).getTag();
nameTextView.setText(cursor.getString(cursor.getColumnIndex(FeedEntry.col_first)));
TextView lastTextView = (TextView) view.findViewById(R.id.last_view);
lastTextView.setText(cursor.getString(cursor.getColumnIndex(FeedEntry.col_last)));
TextView zipTextView = (TextView) view.findViewById(R.id.zip_view);
zipTextView.setText(cursor.getString(cursor.getColumnIndex(FeedEntry.col_zip)));
TextView ageTextView = (TextView) view.findViewById(R.id.age_view);
ageTextView.setText(cursor.getString(cursor.getColumnIndex(FeedEntry.col_age)));
TextView sexTextView = (TextView) view.findViewById(R.id.sex_view);
sexTextView.setText(cursor.getString(cursor.getColumnIndex(FeedEntry.col_sex)));
Button delete = (Button) view.findViewById(R.id.delete);
delete.setTag(nameTextView);
}
public View newView(Context context, Cursor cursor, ViewGroup parent) {
// TODO Auto-generated method stub
LayoutInflater inflater = LayoutInflater.from(parent.getContext());
View view = inflater.inflate(R.layout.profile_list_item, parent, false);
return view;
}
public void onDelete()
{
//FeedReaderDbHelper dbHelper = new FeedReaderDbHelper(context);
//dbHelper.delete(nameTextView);
FeedReaderDbHelper mDbHelper = new FeedReaderDbHelper(null);//getApplicationContext()
SQLiteDatabase db = mDbHelper.getWritableDatabase();
String selection = FeedEntry.col_first + " LIKE = ";
String[] selectionArgs = { String.setTag()};
db.delete(FeedEntry.table_name, selection, selectionArgs);
}
}
和我的數據庫幫手
package com.example.votesmart2;
import com.example.votesmart2.FeedReaderContract.FeedEntry;
import android.content.Context;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteOpenHelper;
import android.widget.TextView;
public class FeedReaderDbHelper extends SQLiteOpenHelper{
private static final String text_type = " TEXT";
private static final String int_type = " INTEGER";
private static final String comma_sep = ", ";
private static final String open_paren = " (";
private static final String close_paren = ")";
private static final String sql_create_entries = "CREATE TABLE " + FeedEntry.table_name + open_paren +
FeedEntry.col_id + " INTEGER PRIMARY KEY, " +
FeedEntry.col_first + text_type + comma_sep +
FeedEntry.col_last + text_type + comma_sep +
FeedEntry.col_zip + int_type + comma_sep +
FeedEntry.col_age + int_type + comma_sep +
FeedEntry.col_sex + text_type + close_paren;
private static final String sql_delete_entries = "DROP TABLE IF EXISTS " + FeedEntry.table_name;
//INCREMENT VERSION NUMBER IF CHANGE DATABASE SCHEMA
public static final int database_version = 7;
public static final String database_name = "VoteSmarter.db";
public FeedReaderDbHelper(Context context) {
super(context, database_name, null, database_version);
// TODO Auto-generated constructor stub
}
@Override
public void onCreate(SQLiteDatabase db) {
// TODO Auto-generated method stub
db.execSQL(sql_create_entries);
}
@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
// TODO Auto-generated method stub
db.execSQL(sql_delete_entries);
onCreate(db);
}
SQLiteDatabase db = getWritableDatabase();
public Cursor getRecords(){
String[] projection = { FeedEntry.col_id,
FeedEntry.col_first,
FeedEntry.col_last,
FeedEntry.col_zip,
FeedEntry.col_age,
FeedEntry.col_sex};
String sortOrder = FeedEntry.col_first + " DESC";
Cursor c = db.query(FeedEntry.table_name, projection, null, null, null, null, sortOrder);
return c;
}
public void delete(TextView nameTextView) {
// TODO Auto-generated method stub
String selection = FeedEntry.col_first + " LIKE ?";
String[] selectionArgs = { String.valueOf(nameTextView)};
db.delete(FeedEntry.table_name, selection, selectionArgs);
}
}
任何幫助將不勝感激我一直在努力與此一段時間了。謝謝