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在我的登录活动中，我在选项菜单Login和Change User上创建了2个按钮。如果用户点击更改用户，则数据将从手机中删除。我显示一个对话框，要求用户确认此操作。optionsmenu两种情况都执行
它似乎工作正常，直到用户注销一次，然后不在用户名和密码textviews中输入任何凭据。如果用户点击登录按钮时这些为空，则显示“请输入有效名称”的Toast消息，但对话框也会显示询问用户是否想更改用户。
我的问题是为什么对话框显示要求用户确认他们想要更改用户，当此代码不在选项菜单中的登录情况下？这就像用户点击空字段登录时那样更改用户代码执行。预先感谢马特。
@Override
public boolean onOptionsItemSelected(MenuItem item) {
Cursor allFromCompIdTable = nfcscannerapplication.loginValidate.queryAllFromCompanyIdTable();
if(allFromCompIdTable.getCount() > 0){
if(allFromCompIdTable.moveToLast()){
compId = allFromCompIdTable.getString(allFromCompIdTable
.getColumnIndex(LoginValidate.C_COMPANY_ID_OUTSIDE_APP_PURPOSES));
}
}
if(isAllowChangeUser.equalsIgnoreCase("false")){
if(item.getItemId() == R.id.changeuser)
item.setVisible(false);
}
switch (item.getItemId()) {
case R.id.login:
Log.e(TAG, "login clicked from opts menu");
theUsername = userName.getText().toString();
if(theUsername.trim().equalsIgnoreCase("")){
Toast.makeText(
EntryActivity.this,
"Please enter a valid name.",
Toast.LENGTH_LONG).show();
onCreate(sIs);
}else{
thePassword = passwordPin.getText().toString();
String loginType = "1";
if(isSavePassword.trim().equalsIgnoreCase("false")){
if(! thePassword.trim().equalsIgnoreCase("")){
String[] params = new String[]{compId, theUsername, thePassword, loginType};
//validate user Asynchonously on background thread
AsyncValidateCarer avc = new AsyncValidateCarer();
avc.execute(params);
}else{
Toast.makeText(
EntryActivity.this,
"Please enter a valid password.",
Toast.LENGTH_LONG).show();
}
}else if(isSavePassword.trim().equalsIgnoreCase("true")){
Cursor c = nfcscannerapplication.loginValidate.queryAllFromCarer();
String firstNameFromDB = null;
String passwordFromDB = null;
String carerIdFromDB = null;
if(c != null && c.getCount() > 0){
c.moveToLast();
firstNameFromDB = c.getString(c.getColumnIndex(LoginValidate.C_CARER_FIRSTNAME));
passwordFromDB = c.getString(c.getColumnIndex(LoginValidate.C_PASSWORD));
carerIdFromDB = c.getString(c.getColumnIndex(LoginValidate.C_CARER_ID));
carerID = carerIdFromDB;
}else{
String[] params = new String[]{compId, theUsername, thePassword, loginType};
//validate user Asynchonously on background thread
AsyncValidateCarer avc = new AsyncValidateCarer();
avc.execute(params);
}
if(theUsername.trim().equalsIgnoreCase(firstNameFromDB) &&
thePassword.trim().equalsIgnoreCase(passwordFromDB)){
Intent intent2 = new Intent(EntryActivity.this,
NfcscannerActivity.class);
intent2.setAction(CUSTOM_QRCODE_ACTION);
intent2.putExtra("carerid", carerID);
startActivity(intent2);
}
}
return true;
}
case R.id.changeuser:
AlertDialog.Builder alertDialogBuilder = new AlertDialog.Builder(this);
alertDialogBuilder.setMessage("Are you sure you want to change user? All call history and messages will be deleted.")
.setCancelable(false)
.setPositiveButton("OK",
new DialogInterface.OnClickListener(){
public void onClick(DialogInterface dialog, int id){
Log.e(TAG, "change user button clicked");
nfcscannerapplication.loginValidate.deleteTableCarer();
nfcscannerapplication.loginValidate.deleteTableTransactions();
Toast.makeText(
EntryActivity.this,
"Carer logged out",
Toast.LENGTH_LONG).show();
EntryActivity.this.onCreate(sIs);
}
});
alertDialogBuilder.setNegativeButton("Cancel",
new DialogInterface.OnClickListener(){
public void onClick(DialogInterface dialog, int id){
}
});
AlertDialog alert = alertDialogBuilder.create();
alert.show();
return true;
default:
return super.onOptionsItemSelected(item);
}
}
谢谢工作正常。我不得不添加一个返回true;在2个大小写块之外的方法结束处以及默认情况之后。 – turtleboy