这很难解释，但我会尝试。
我有一个Listview，显示当前保存在SQLite数据库中的所有项目。但Listview仅显示数据集行的部分内容。 单击列表视图项时，将启动一个新的活动（ResultEntryActivity），其中显示所有行内容。在该活动中，我希望用户能够在他/她点击按钮时删除该条目。然后，intent会将用户带回listview所在的SearchEntryActivity。 然后删除列表视图项，但是当我点击现在位于刚刚删除的项目的位置的项目时，ResultEntryActivity中不会显示任何内容。但不知何故，listview项目本身（显示部分内容）显示了正确的内容...... 有谁知道如何解决这一问题？我真的需要它来工作。
这些是SearchEntryActivity的重要方法：
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_search);
initDb();
initListView();
initAdapter();
setItemListener();
}
@Override
protected void onDestroy() {
myDb.close();
super.onDestroy();
}
private void initDb() {
myDb = HomeActivity.myDb;
myDb.open();
}
@Override
protected void onResume(){
super.onResume();
getAdapter.swapItems(myDb.getAllEntryItems(0, "list"));
}
private void initListView() {
listView = (ListView) findViewById(R.id.list);
}
private void initAdapter() {
myList = myDb.getAllEntryItems(0, "list");
Collections.sort(myList);
getAdapter = new ListViewAdapter(this, myList);
listView.setAdapter(getAdapter);
}
private void setItemListener() {
listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
Intent i = new Intent(SearchActivity.this, ResultEntryActivity.class);
id += 1;
i.putExtra("entryId", id);
i.putExtra("listItemId", position);
startActivity(i);
}
});
}
这些是ResultEntryActivity的重要方法：
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_result_entry);
initComponents();
initDb();
viewAll();
deleteEntry();
}
private void deleteEntry() {
deleteEntry.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
view.startAnimation(buttonAnimation);
showAlert();
}
});
}
private void showAlert() {
AlertDialog.Builder passwordDialog = new AlertDialog.Builder(this);
LayoutInflater inflater = (LayoutInflater)ResultEntryActivity.this.getSystemService(LAYOUT_INFLATER_SERVICE);
View layout = inflater.inflate(R.layout.delete_alert_layout, null);
Button yes = (Button)layout.findViewById(R.id.button_yes);
Button no = (Button)layout.findViewById(R.id.button_no);
dialog = passwordDialog.create();
dialog.setView(layout);
dialog.setCancelable(false);
yes.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
view.startAnimation(buttonAnimation);
dialog.dismiss();
myDb.deleteEntry(""+entryId+"");
Toast.makeText(ResultEntryActivity.this, entryDeleted, Toast.LENGTH_LONG).show();
Intent i = new Intent(ResultEntryActivity.this, SearchActivity.class);
i.putExtra("position", entryId);
startActivity(i);
}
});
no.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
view.startAnimation(buttonAnimation);
//Eintrag soll nicht gelöscht werden -> Alert Dialog wird einfach geschlossen und nichts passiert.
dialog.dismiss();
}
});
dialog.show();
}
private void initDb() {
myDb = HomeActivity.myDb;
myDb.open();
}
private void initComponents() {
imageView= (ImageView) findViewById(R.id.image_view);
mapImageView = (ImageView) findViewById(R.id.map_image_view);
dateView = (TextView) findViewById(R.id.result_date);
dateView.setPaintFlags(dateView.getPaintFlags() | Paint.UNDERLINE_TEXT_FLAG);
headlineView = (TextView) findViewById(R.id.result_headline);
textView = (TextView) findViewById(R.id.result_text);
editEntry = (ImageButton)findViewById(R.id.edit_this_entry);
deleteEntry = (ImageButton)findViewById(R.id.delete_this_entry);
}
public void viewAll(){
Bundle idBundle = getIntent().getExtras();
entryId = (long) idBundle.get("entryId");
System.out.println(entryId);
myDb.getAllEntryItems(entryId, "entry");
}
这是来自我的数据库：
public ArrayList<EntryItem> getAllEntryItems(long id, String entryOrList) {
if(entryOrList.equals("entry")){
Cursor cursor = database.query(TABLE_NAME, new String[] {COL_ID, COL_DATE, COL_HEAD, COL_IMAGE, COL_MAP,COL_TEXT }, COL_ID + "=" + id +"", null, null, null, null);
if (cursor.moveToFirst()) {
do {
String date = cursor.getString(INDEX_DATE);
ResultEntryActivity.dateView.setText(date);
String headline = cursor.getString(INDEX_HEAD);
ResultEntryActivity.headlineView.setText(headline);
String text = cursor.getString(INDEX_TEXT);
ResultEntryActivity.textView.setText(text);
byte[] image = cursor.getBlob(INDEX_IMAGE);
if(image !=null){
ResultEntryActivity.imageView.setVisibility(View.VISIBLE);
ResultEntryActivity.imageView.setImageBitmap(DbBitmapUtility.getImage(image));
}
byte[] map = cursor.getBlob(INDEX_MAP);
if(map != null){
ResultEntryActivity.mapImageView.setVisibility(View.VISIBLE);
ResultEntryActivity.mapImageView.setImageBitmap(DbBitmapUtility.getImage(map));
}
} while (cursor.moveToNext());
}
cursor.close();
}else if(entryOrList.equals("list")){
ArrayList<EntryItem> listItems = new ArrayList<EntryItem>();
Cursor cursor = database.query(TABLE_NAME, new String[] { COL_ID, COL_DATE,
COL_HEAD, COL_IMAGE }, null, null, null, null, null);
if (cursor.moveToFirst()) {
do {
String date = cursor.getString(INDEX_DATE);
String headline = cursor.getString(INDEX_HEAD);
if(cursor.getBlob(INDEX_IMAGE) != null){
byte[] image = cursor.getBlob(INDEX_IMAGE);
listItems.add(new EntryItem(date, headline, image, null, null));
}else {
listItems.add(new EntryItem(date, headline, null, null, null));
}
} while (cursor.moveToNext());
}
cursor.close();
return listItems;
}
return null;
}
public void deleteEntry(String id){
database.delete(TABLE_NAME, "ID = ?", new String[] {id});
}
我希望我添加了相关的所有内容。对不起，这太多了，但我真的需要帮助。 感谢。