由于糟糕的编程风格和对 Android 的缺乏经验，我真的很沮丧。很抱歉告诉你们。
该应用程序的工作原理：
这是我的工作培训的待办事项应用程序。有 6 列。其中 3 个包含有关待办事项的信息，另外 3 个包含查看详细信息、编辑和删除屏幕。
即使在设置了 a 之后，当用户出于某种原因单击删除时notifyDataChange，我的屏幕也不会更新，并且仍会显示已删除的行。
关于这里发生了什么的任何想法？我已经尝试了大约 3 个小时的许多解决方案
如果代码有点乏味，请在此处发布代码。
带 s 的全班ListView：
package com.DCWebMakers.Vairon;
import java.util.ArrayList;
import java.util.List;
import android.app.Activity;
import android.app.Dialog;
import android.content.Intent;
import android.database.DataSetObserver;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.ViewGroup;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.CursorAdapter;
import android.widget.ListAdapter;
import android.widget.ListView;
import android.widget.TextView;
public class ManageAppointment extends Activity {
ListView rowLi, whenLi, postedLi, detailsLi, editLi, removeLi;
ArrayAdapter<String> whenAdapter, postedAdapter, detailsAdapter,
editAdapter, removeAdapter;
ArrayAdapter<Integer> rowAdapter;
final AppointmentInfo information = new AppointmentInfo(this);
@Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
/*
* The ListViews created here are not the proper way to make ListViews.
* This is for testing purposes and will be updated for efficiency. The
* remove also doesn't work properly
*/
super.onCreate(savedInstanceState);
setContentView(R.layout.manage_appointment);
initVariables();
try {
databaseManagement();
detailsLi.setOnItemClickListener(new OnItemClickListener() {
public void onItemClick(AdapterView<?> aV, View v, int pos,
long arg3) {
// TODO Auto-generated method stub
Intent openDetails = new Intent(
"com.DCWebMakers.Vairon.APPOINTMENTDETAILS");
openDetails.putExtra("position", pos);
startActivity(openDetails);
}
});
editLi.setOnItemClickListener(new OnItemClickListener() {
public void onItemClick(AdapterView<?> aV, View v, int pos,
long arg3) {
// TODO Auto-generated method stub
Intent openEdit = new Intent(
"com.DCWebMakers.Vairon.EDITAPPOINTMENT");
openEdit.putExtra("position", pos);
startActivity(openEdit);
notifyChangesToAdapters();
}
});
removeLi.setOnItemClickListener(new OnItemClickListener() {
public void onItemClick(AdapterView<?> aV, View v, int pos,
long arg3) {
// TODO Auto-generated method stub
databaseManagement();
information.open();
information.delete(pos);
information.close();
Dialog sucDeleted = new Dialog(ManageAppointment.this);
sucDeleted.setTitle("Sucesfully deleted");
TextView tvDintWorked = new TextView(ManageAppointment.this);
tvDintWorked.setText("The appointment at position:" + pos
+ " was sucesfully deleted");
sucDeleted.setContentView(tvDintWorked);
sucDeleted.show();
notifyChangesToAdapters();
}
});
} catch (Exception e) {
Dialog showError = new Dialog(this);
showError.setTitle("Error");
TextView tvDintWorked = new TextView(this);
String error = e.toString();
tvDintWorked.setText(error);
showError.setContentView(tvDintWorked);
showError.show();
}
}
public void initVariables() {
rowLi = (ListView) findViewById(R.id.rowList);
whenLi = (ListView) findViewById(R.id.whenList);
postedLi = (ListView) findViewById(R.id.postedList);
detailsLi = (ListView) findViewById(R.id.detailsList);
editLi = (ListView) findViewById(R.id.editList);
removeLi = (ListView) findViewById(R.id.removeList);
}
@Override
protected void onPause() { // TODO Auto-generated method stub
super.onPause();
}
@Override
protected void onResume() {
// TODO Auto-generated method stub
super.onResume();
notifyChangesToAdapters();
}
private void notifyChangesToAdapters() {
// TODO Auto-generated method stub
rowAdapter.notifyDataSetChanged();
whenAdapter.notifyDataSetChanged();
postedAdapter.notifyDataSetChanged();
detailsAdapter.notifyDataSetChanged();
editAdapter.notifyDataSetChanged();
removeAdapter.notifyDataSetChanged();
}
@Override
public void onBackPressed() {
// TODO Auto-generated method stub
super.onBackPressed();
Intent mainIntent = new Intent("com.DCWebMakers.Vairon.MAINMENU");
startActivity(mainIntent);
}
public void databaseManagement() {
information.open();
int primaryKey = information.getKeys();
String when[] = information.getWhen();
String posted[] = information.getPosted();
String details[] = new String[primaryKey];
Integer rowNumber[] = new Integer[primaryKey];
String edit[] = new String[primaryKey];
String delete[] = new String[primaryKey];
for (int set = 0; set < rowNumber.length; set++) {
rowNumber[set] = (set);
}
for (int set = 0; set < details.length; set++) {
details[set] = ("Details");
}
for (int set = 0; set < edit.length; set++) {
edit[set] = ("Edit");
}
for (int set = 0; set < delete.length; set++) {
delete[set] = ("Delete");
}
information.close();
rowAdapter = new ArrayAdapter<Integer>(ManageAppointment.this,
android.R.layout.simple_list_item_1, rowNumber);
whenAdapter = new ArrayAdapter<String>(ManageAppointment.this,
android.R.layout.simple_list_item_1, when);
postedAdapter = new ArrayAdapter<String>(ManageAppointment.this,
android.R.layout.simple_list_item_1, posted);
detailsAdapter = new ArrayAdapter<String>(ManageAppointment.this,
android.R.layout.simple_list_item_1, details);
editAdapter = new ArrayAdapter<String>(ManageAppointment.this,
android.R.layout.simple_list_item_1, edit);
removeAdapter = new ArrayAdapter<String>(ManageAppointment.this,
android.R.layout.simple_list_item_1, delete);
rowLi.setAdapter(rowAdapter);
whenLi.setAdapter(whenAdapter);
postedLi.setAdapter(postedAdapter);
detailsLi.setAdapter(detailsAdapter);
editLi.setAdapter(editAdapter);
removeLi.setAdapter(removeAdapter);
}
}
删除方法：
public void delete(int position) {
theDatabase.beginTransaction();
try {
theDatabase
.delete(DATABASE_TABLE, KEY_ROWID + "=" + position, null);
theDatabase.setTransactionSuccessful();
} catch (SQLiteException e) {
// TODO: handle exception
e.printStackTrace();
} finally {
theDatabase.endTransaction();
theDatabase.close();
}
}