カスタムを使用して名前のリストを作成しようとしていますListView
。各行には、編集および削除ボタンがあります。
編集ボタンは正常に機能しますが、ユーザーが編集ボタンまたは削除ボタンを押した後にデータベースを更新する方法がわかりません。
これは私がやりたいことです:
UI とデータベースから行を削除したい。
ユーザーがオプション メニューのデータベース保存ボタンを押したときに、編集可能なテキストを保存したいと考えています。
これが私のコードです:
EditList.java [メイン]
package edit.list;
import android.app.Activity;
import android.content.Intent;
import android.database.Cursor;
import android.os.Bundle;
import android.view.View;
import android.widget.ListView;
import android.widget.RelativeLayout;
import android.widget.SimpleCursorAdapter;
import android.widget.TextView;
public class EditLIST extends Activity {
private AndroidSQLite mySQLiteAdapter ;
final static String EXTRA_MESSAGE = "edit.list.message";
public void onClick (View view) {
Intent intent = new Intent(this,display.class);
RelativeLayout relativeLayout = (RelativeLayout) view.getParent();
TextView textView = (TextView) relativeLayout.findViewById(R.id.textView1);
// TextView textView=(TextView) findViewById(R.id.textView1);
String message = textView.getText().toString();
intent.putExtra(EXTRA_MESSAGE,message);
startActivity(intent);
}
public void delete (View view){
//[what i have to write here]
}
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_edit_list);
ListView listContent = (ListView)findViewById(R.id.listView1);
mySQLiteAdapter = new AndroidSQLite(this);
mySQLiteAdapter.openToWrite();
mySQLiteAdapter.deleteAll();
mySQLiteAdapter.insert("umesh");
mySQLiteAdapter.insert("ramesh");
mySQLiteAdapter.insert("piyush");
mySQLiteAdapter.close();
mySQLiteAdapter = new AndroidSQLite(this);
mySQLiteAdapter.openToRead();
Cursor cursor = mySQLiteAdapter.queueAll();
startManagingCursor(cursor);
String[] from = new String[]{AndroidSQLite.KEY_FNAME};
int[] to = new int[]{R.id.textView1};
SimpleCursorAdapter cursorAdapter =
new SimpleCursorAdapter(this, R.layout.button, cursor, from, to);
listContent.setAdapter(cursorAdapter);
}
protected void onDestroy() {
super.onDestroy();
mySQLiteAdapter.close();
}
}
AndroidSQLite.java
package edit.list;
import android.content.ContentValues;
import android.content.Context;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteOpenHelper;
import android.database.sqlite.SQLiteDatabase.CursorFactory;
public class AndroidSQLite {
public static final String MYDATABASE_NAME = "abncd";
public static final String MYDATABASE_TABLE = "zxc";
public static final int MYDATABASE_VERSION = 1;
public static final String KEY_ID = "_id";
public static final String KEY_FNAME = "FNAME";
public static final String KEY_CONTENT1 = "Content1";
//create table MY_DATABASE (ID integer primary key, Content text not null);
private static final String SCRIPT_CREATE_DATABASE =
"create table " + MYDATABASE_TABLE + " ("
+ KEY_ID + " integer primary key autoincrement, "
+ KEY_FNAME + " text not null);";
private SQLiteHelper sqLiteHelper;
private SQLiteDatabase sqLiteDatabase;
private Context context;
public AndroidSQLite(Context c){
context = c;
}
public AndroidSQLite openToRead() throws android.database.SQLException {
sqLiteHelper = new SQLiteHelper(context, MYDATABASE_NAME, null, MYDATABASE_VERSION);
sqLiteDatabase = sqLiteHelper.getReadableDatabase();
return this;
}
public AndroidSQLite openToWrite() throws android.database.SQLException {
sqLiteHelper = new SQLiteHelper(context, MYDATABASE_NAME, null, MYDATABASE_VERSION);
sqLiteDatabase = sqLiteHelper.getWritableDatabase();
return this;
}
public void close(){
sqLiteHelper.close();
}
public long insert(String fname){
ContentValues contentValues = new ContentValues();
contentValues.put(KEY_FNAME, fname);
return sqLiteDatabase.insert(MYDATABASE_TABLE, null, contentValues);
}
public int deleteAll(){
return sqLiteDatabase.delete(MYDATABASE_TABLE, null, null);
}
public Cursor queueAll(){
String[] columns = new String[]{KEY_ID, KEY_FNAME};
Cursor cursor = sqLiteDatabase.query(MYDATABASE_TABLE, columns,
null, null, null, null, null);
return cursor;
}
public void delete(long id)
{
sqLiteDatabase.delete(MYDATABASE_TABLE, KEY_ID+"="+id, null);
}
public void update_byID(int id, String v1)
{
ContentValues values = new ContentValues();
values.put(KEY_CONTENT1, v1);
sqLiteDatabase.update(MYDATABASE_TABLE, values, KEY_ID+"="+id, null);
}
public class SQLiteHelper extends SQLiteOpenHelper {
public SQLiteHelper(Context context, String name,
CursorFactory factory, int version) {
super(context, name, factory, version);
}
@Override
public void onCreate(SQLiteDatabase db) {
// TODO Auto-generated method stub
db.execSQL(SCRIPT_CREATE_DATABASE);
}
@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
// TODO Auto-generated method stub
}
}
}
表示.java
package edit.list;
import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuInflater;
import android.view.MenuItem;
import android.widget.EditText;
import android.widget.Toast;
public class display extends Activity {
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.display);
// Get the message from the intent
Intent intent = getIntent();
String message = intent.getStringExtra(EditLIST.EXTRA_MESSAGE);
// Create the text view
EditText editText = new EditText(this);
editText.setTextSize(40);
editText.setText(message);
// Set the text view as the activity layout
setContentView(editText);
}
public boolean onCreateOptionsMenu (Menu menu)
{
MenuInflater inflater = getMenuInflater();
inflater.inflate(R.menu.activity_edit_list,menu);
return true;
}
public boolean onOptionsItemSelected(MenuItem item)
{
//int id=et1.getId();
// Handle item selection
switch (item.getItemId())
{
case R.id.save:
//[WHAT I HAVE 2 WRITE HERE]
finish();
return true;
case R.id.cancel:
Toast.makeText(this, "Cancle clicked",Toast.LENGTH_SHORT).show();
return true;
default:
return super.onOptionsItemSelected(item);
}
}
}
ここにxmlファイル.. activity_edit_list.xml
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:id="@+id/RelativeLayout1"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="horizontal" >
<ListView
android:id="@+id/listView1"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:drawSelectorOnTop="false">
</ListView>
</RelativeLayout>
ボタン.xml
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent" >
<Button
android:id="@+id/button1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentRight="true"
android:onClick="onClick"
android:text="delete" />
<Button
android:id="@+id/button2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentTop="true"
android:layout_toLeftOf="@+id/button1"
android:onClick="Click"
android:text="edit" />
<TextView
android:id="@+id/textView1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignBottom="@+id/button2"
android:layout_alignParentLeft="true"
android:layout_alignParentTop="true"
android:layout_toLeftOf="@+id/button2"
android:text=" " />
</RelativeLayout>
https://lh6.googleusercontent.com/-NfeEPAeYSDo/UCtlQQepw2I/AAAAAAAAA-I/SnAUytNSO-Q/s640/Capture.JPG