[英]How to stop toast & alertDialog losing focus on my EditText filter
更新：
最新更新 - 添加了getChanges（）方法。
第二次更新 - 我添加了整個ShoppingList.java類。
第一次更新 - 在2個人喜歡這個問題但沒有答案之后，我已經為這個問題開了一筆賞金。
題：
我有類似的問題，一旦我開始一個新的意圖，然后返回到原始頁面，我無法重新過濾我的ListView。 這是通過使用overResume（）方法並從另一個過濾器方法中調用我的過濾器代碼來解決的。
我有的最新問題是應該在我的應用頁面上使用dialogBuilder或toast消息，然后再次將過濾器文本消隱，即我的過濾器忽略輸入到我的過濾器EditText中的任何文本。
以下是一些突出顯示問題的屏幕截圖：
加載列表的項目：
搜索詞輸入到過濾器EditText中並正確過濾：
第一個項目“A”被編輯為“AB”。 Toast消息確認了該動作：
這就是問題，對話框構建器（編輯項目的方式）和Toast消息是完整的，在EditText中輸入一個新的過濾器術語，過濾器不再過濾：
這是我的過濾器代碼：
package com.example.flybaseapp;
public class ShoppingList extends ListActivity implements OnClickListener {
Button AddItem;
Button showShop;
ListView showItems;
SimpleCursorAdapter cursorAdapter;
Long itemId;
TextView totalPrice;
String itemDescription;
int itemAmount;
int itemPrice;
EditText itemNameEdit;
DBHandlerShop getCons;
Dialog e1;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.shoppinglistlayout);
AddItem = (Button) findViewById(R.id.btnAddItem);
showShop = (Button) findViewById(R.id.btnSearchShops);
showItems = (ListView) findViewById(android.R.id.list);
totalPrice = (TextView) findViewById(R.id.totalListPrice);
AddItem.setOnClickListener(this);
showShop.setOnClickListener(this);
setList();
int setPrice = updateTotal();
totalPrice.setText(Integer.toString(setPrice));
itemNameEdit = (EditText) findViewById(R.id.inputItemName);
showItems.setTextFilterEnabled(true);
itemNameEdit.addTextChangedListener(new TextWatcher() {
@Override
public void afterTextChanged(Editable s) {
}
@Override
public void beforeTextChanged(CharSequence s, int start, int count,
int after) {
}
@Override
public void onTextChanged(CharSequence s, int start, int before,
int count) {
cursorAdapter.getFilter().filter(s.toString());
showItems.refreshDrawableState();
}
});
getCons = new DBHandlerShop(this, null, null);
getCons.open();
cursorAdapter.setFilterQueryProvider(new FilterQueryProvider() {
public Cursor runQuery(CharSequence constraint) {
return getCons.getChanges((constraint.toString()));
}
});
showItems.setAdapter(cursorAdapter);
}
@Override
public void onClick(View clickedAdd) {
switch (clickedAdd.getId()) {
case (R.id.btnAddItem):
show();
break;
case (R.id.btnSearchShops):
Intent checkGPS = new Intent("com.example.flybaseapp.CheckGPS");
startActivity(checkGPS);
break;
}
}
@Override
protected void onListItemClick(ListView l, View v, int position, long idd) {
super.onListItemClick(l, v, position, idd);
itemId = idd;
final CharSequence[] items = { "Edit Item", "Delete Item" };
Builder alertDialogBuilder = new AlertDialog.Builder(ShoppingList.this);
alertDialogBuilder.setTitle("Item Options:");
alertDialogBuilder.setItems(items,
new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int item) {
if (items[item].equals("Edit Item")) {
AlertDialog.Builder builder = new AlertDialog.Builder(
ShoppingList.this);
builder.setTitle("Edit Item");
DBHandlerShop setEdit = new DBHandlerShop(
ShoppingList.this, null, null);
setEdit.open();
String itemName = setEdit.getItem(itemId);
int itemAmount = setEdit.getItemQuan(itemId);
int itemPrice = setEdit.getItemCost(itemId);
setEdit.close();
LinearLayout layout = new LinearLayout(
ShoppingList.this);
layout.setOrientation(LinearLayout.VERTICAL);
final EditText titleBox = new EditText(
ShoppingList.this);
titleBox.setText(itemName);
titleBox.setHint("Item Name:");
layout.addView(titleBox);
final EditText quantityBox = new EditText(
ShoppingList.this);
quantityBox.setText(Integer.toString(itemAmount));
quantityBox.setHint("Item Quantity");
layout.addView(quantityBox);
final EditText priceBox = new EditText(
ShoppingList.this);
priceBox.setText(Integer.toString(itemPrice));
priceBox.setHint("Item Price.");
layout.addView(priceBox);
builder.setView(layout);
builder.setPositiveButton("Ok",
new DialogInterface.OnClickListener() {
public void onClick(
DialogInterface dialog,
int whichButton) {
Editable valueItem = titleBox
.getText();
Editable valueAmount = quantityBox
.getText();
Editable valuePrice = priceBox
.getText();
String itemDescription = valueItem
.toString();
String s = valueAmount.toString();
int itemAmount = Integer
.parseInt(s);
String a = valuePrice.toString();
int itemPrice = Integer.parseInt(a);
try {
DBHandlerShop update = new DBHandlerShop(
ShoppingList.this,
null, null);
int totalCombined = itemAmount
* itemPrice;
update.open();
update.updateItem(itemId,
itemDescription,
itemAmount, itemPrice);
update.close();
int setPrice = updateTotal();
totalPrice.setText(Integer
.toString(setPrice));
} catch (Exception e) {
Toast.makeText(
getApplicationContext(),
"Items not updated.",
Toast.LENGTH_SHORT)
.show();
} finally {
Toast.makeText(
getApplicationContext(),
"Items updated.",
Toast.LENGTH_SHORT)
.show();
setList();
}
}
});
builder.setNegativeButton("Cancel",
new DialogInterface.OnClickListener() {
public void onClick(
DialogInterface dialog,
int whichButton) {
}
});
builder.show();
}
else if (items[item].equals("Delete Item")) {
try {
DBHandlerShop delete = new DBHandlerShop(
ShoppingList.this, null, null);
delete.open();
delete.deleteItem(itemId);
delete.close();
DBHandlerShop findPrice = new DBHandlerShop(
ShoppingList.this, null, null);
findPrice.open();
int returnedCost = findPrice
.getItemCost(itemId);
findPrice.close();
int cost = updateTotal();
int newTotal = cost - returnedCost;
totalPrice.setText(Integer.toString(newTotal));
}
catch (Exception e) {
Toast.makeText(getApplicationContext(),
"Item failed to be deleted.",
Toast.LENGTH_SHORT).show();
}
finally {
Toast.makeText(getApplicationContext(),
"Item deleted from the list.",
Toast.LENGTH_SHORT).show();
setList();
}
}
}
});
alertDialogBuilder.show();
}
@SuppressWarnings("deprecation")
private void setList() {
DBHandlerShop DBShop = new DBHandlerShop(this, null, null);
DBHandlerShop searchItems = new DBHandlerShop(this, null, null);
searchItems.open();
Cursor cursor = searchItems.getItems();
startManagingCursor(cursor);
searchItems.close();
String[] from = new String[] { DBShop.KEY_ITEMSHOP, DBShop.KEY_ITEMNUM,
DBShop.KEY_ITEMPRICE };
int[] to = new int[] { R.id.txtSetItem, R.id.txtSetAmount,
R.id.txtSetPrice };
cursorAdapter = new SimpleCursorAdapter(this, R.layout.setshoppinglist,
cursor, from, to);
showItems.setAdapter(cursorAdapter);
}
private int updateTotal() {
DBHandlerShop total = new DBHandlerShop(this, null, null);
int totalPrice = 0;
total.open();
Cursor totalPrices = total.getTotals();
total.close();
if (totalPrices != null) {
startManagingCursor(totalPrices);
if (totalPrices.moveToFirst()) {
do {
int cost = totalPrices.getInt(3);
int amount = totalPrices.getInt(2);
int totalCost = cost * amount;
totalPrice += totalCost;
} while (totalPrices.moveToNext());
return totalPrice;
}
}
else {
return totalPrice;
}
return 0;
}
private void show() {
AlertDialog.Builder builder = new AlertDialog.Builder(ShoppingList.this);
builder.setTitle("Enter Item Details:");
LinearLayout layout = new LinearLayout(this);
layout.setOrientation(LinearLayout.VERTICAL);
final EditText titleBox = new EditText(this);
titleBox.setHint("Item Name:");
layout.addView(titleBox);
final EditText quantityBox = new EditText(this);
quantityBox.setHint("Item Quantity");
layout.addView(quantityBox);
final EditText priceBox = new EditText(this);
priceBox.setHint("Item Price.");
layout.addView(priceBox);
builder.setView(layout);
builder.setPositiveButton("Ok", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int whichButton) {
try {
Editable valueItem = titleBox.getText();
Editable valueAmount = quantityBox.getText();
Editable valuePrice = priceBox.getText();
itemDescription = valueItem.toString();
String s = valueAmount.toString();
itemAmount = Integer.parseInt(s);
String a = valuePrice.toString();
itemPrice = Integer.parseInt(a);
DBHandlerShop addItem = new DBHandlerShop(
ShoppingList.this, null, null);
addItem.open();
addItem.insertItems(itemDescription, itemAmount, itemPrice);
addItem.close();
} catch (Exception e) {
Toast.makeText(getApplicationContext(),
"Item failed to be added", Toast.LENGTH_SHORT)
.show();
} finally {
Toast.makeText(getApplicationContext(),
"Item added to your list", Toast.LENGTH_SHORT)
.show();
int cost = updateTotal();
totalPrice.setText(Integer.toString(cost));
setList();
}
}
});
builder.setNegativeButton("Cancel",
new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int whichButton) {
}
});
builder.show();
}
@Override
protected void onResume() {
super.onResume();
setList();
showItems.setTextFilterEnabled(true);
itemNameEdit.addTextChangedListener(new TextWatcher() {
@Override
public void afterTextChanged(Editable s) {
}
@Override
public void beforeTextChanged(CharSequence s, int start, int count,
int after) {
}
@Override
public void onTextChanged(CharSequence s, int start, int before,
int count) {
cursorAdapter.getFilter().filter(s.toString());
showItems.refreshDrawableState();
}
});
getCons = new DBHandlerShop(this, null, null);
getCons.open();
cursorAdapter.setFilterQueryProvider(new FilterQueryProvider() {
public Cursor runQuery(CharSequence constraint) {
return getCons.getChanges((constraint.toString()));
}
});
showItems.setAdapter(cursorAdapter);
}
}
來自Database Handler類的getChanges（）：
public Cursor getChanges(String constraintPassed) {
String [] columns = new String[]{KEY_ROWSHOPID, KEY_ITEMSHOP, KEY_ITEMNUM, KEY_ITEMPRICE};
Cursor c = null;
if(constraintPassed.equals(""))
{
c = ourDatabase.query(DATABASE_TABLESHOP, columns, null, null, null, null, null);
}
else
{
c = ourDatabase.query(DATABASE_TABLESHOP, columns, KEY_ITEMSHOP + " LIKE'" + constraintPassed + "%'", null, null, null, KEY_ITEMSHOP + " ASC", null);
}
if( c != null)
{
c.moveToFirst();
}
return c;
}
編輯完成后，是否需要實施生命周期方法？ 如果是這樣，有人可能會向我推進正確的方向，因為我嘗試過onResume（）和onRestart（）無濟於事。
更新過濾器后，嘗試在適配器上調用notifyDataSetChanged() 。 這應該通知ListView它還需要刷新其數據。
據我所見，你正在運行getCons.open(); 多次沒有關閉它們之間。 我不知道open()方法是否忽略多個調用或多次調用會導致錯誤，但您可能想嘗試是否可以通過移動getCons.open();來修復它getCons.open(); 直接在getCons = new DBHandlerShop(this, null, null);下面getCons = new DBHandlerShop(this, null, null); 。
我發現，解決這個問題的一個簡單方法是通過在編輯完成后啟動一個新的intent對象來簡單地調用該類。 這仍然使流程的整體操作流暢而快速，當然也允許我在編輯后進行過濾。 因此，對於暫時的人來說，這就是我將如何使用它。
我想你應該用
android:hapticFeedbackEnabled="true"
android:imeOptions="actionNext"
android:nextFocusUp="@id/editeText1"
android:nextFocusLeft="@id/edittextText"
android:includeFontPadding="true"
我看到你的情況正在發生什么。 每次用戶成功編輯項目時，您都要為列表設置新的適配器！ 而在你的情況下，也TextWatcher加入到onCreate方法您的EditText是使用第一個適配器（在onTextChanged法）在onCreate方法也創造中，第一次創建活動！
有幾種方法可以解決這個問題。 一種方法是改變你實施活動的整個方式（我個人不會這樣做）。
另一種方法是簡單地改變setList方法，該方法在onCreate方法中第一次被調用，並且每次用戶成功編輯項目時。 這是我將要詳細解釋的解決方案，因為它既快速又簡單，而且不耗費時間：
所以你的setList方法應如下所示：
@SuppressWarnings("deprecation")
private void setList() {
DBHandlerShop DBShop = new DBHandlerShop(this, null, null);
DBHandlerShop searchItems = new DBHandlerShop(this, null, null);
searchItems.open();
Cursor cursor = searchItems.getItems();
startManagingCursor(cursor);
searchItems.close();
String[] from = new String [] { DBShop.KEY_ITEMSHOP , DBShop.KEY_ITEMNUM, DBShop.KEY_ITEMPRICE };
int[] to = new int[] { R.id.txtSetItem, R.id.txtSetAmount, R.id.txtSetPrice };
// Check the cursor adapter is previously created
if ( cursorAdapter == null ) {
// There is no previous cursors, create a new one
cursorAdapter = new SimpleCursorAdapter(this, R.layout.setshoppinglist, cursor, from, to);
showItems.setAdapter(cursorAdapter);
}
else {
// There is a previous adapter
// Stop managing its cursor
stopManagingCursor ( cursorAdapter.getCursor() );
// Assign the new cursor to the current adapter
// The old cursor will be closed
cursorAdapter.changeCursor ( cursor );
// No need to refresh the list, it will be automatically refreshed after the adapter's cursor is changed
}
}
以這種方式，列表的適配器與TextWatcher用於過濾列表的適配器相同。 它應該工作，嘗試一下，讓我知道會發生什么。
您可以嘗試以下更改..
顯示您的Toast項目更新/刪除消息后調用此方法
cursorAdapter.notifyDataSetChanged();
在你的setList（）方法中添加以下內容..
cursorAdapter.registerDataSetObserver(new DataSetObserver() {
@Override
public void onChanged() {
super.onChanged();
setList();
}});
並在代碼下移動到setList（）
itemNameEdit.addTextChangedListener(new TextWatcher() {
@Override
public void afterTextChanged(Editable s) {
}
@Override
public void beforeTextChanged(CharSequence s, int start, int count,
int after) {
}
@Override
public void onTextChanged(CharSequence s, int start, int before,
int count) {
cursorAdapter.getFilter().filter(s.toString());
showItems.refreshDrawableState();
}
});
getCons = new DBHandlerShop(this, null, null);
getCons.open();
cursorAdapter.setFilterQueryProvider(new FilterQueryProvider() {
public Cursor runQuery(CharSequence constraint) {
return getCons.getChanges((constraint.toString()));
}
});
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