我有一个包含6个值的数组.. 我在spinner中设置该数组，默认选择为3 .. 当用户选择低于3时，我想显示一个警告对话框，如无法选择..如果用户选择上面3表示我想显示一个警告对话框，如你确定要改变.. 问题是在更改了上面的3之后，我将微调器的选择设置为更改位置..但是警报对话框在我的程序中显示了两倍的时间.. 请给我任何解决方案？..
import android.app.ProgressDialog;
import android.content.DialogInterface;
import android.os.Handler;
import android.support.v7.app.AlertDialog;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.Spinner;
import com.android.c_fiber.Intro_Slider.SessionManagement;
import java.util.Arrays;
import java.util.HashMap;
public class spinnerDoubt extends AppCompatActivity{
String[] plans,months;
int changed_plan_position,changed_month_position;
int plan_position,plan_month;
String selectedItem;
Spinner spinner_plan,spinner_month;
String plan;
String month = "1";
boolean isChanged = false;
boolean isMonthChanged = false;
SessionManagement sessionManagement;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_pay_details);
plans = new String[]{"Start","Fast","Hot","Pace","Electric","Thunder"};
months = new String[]{"1","3","6","12"};
spinner_plan = (Spinner) findViewById(R.id.pay_plan);
spinner_month = (Spinner) findViewById(R.id.pay_month);
final ProgressDialog progressDialog = new ProgressDialog(this);
progressDialog.setMessage("Loading...");
progressDialog.setProgressStyle(ProgressDialog.STYLE_SPINNER);
progressDialog.show();
Runnable progressRunnable = new Runnable() {
@Override
public void run() {
sessionManagement = new SessionManagement(this);
HashMap<String,String> hashMap = sessionManagement.getUserDetails();
plan = hashMap.get(SessionManagement.KEY_PLAN_NAME);
plan_position = Arrays.asList(plans).indexOf(plan);
plan_month = Arrays.asList(months).indexOf(month);
ArrayAdapter arrayAdapter = new ArrayAdapter(this,R.layout.layout_spinner,R.id.spinner_text,plans);
spinner_plan.setAdapter(arrayAdapter);
spinner_plan.setSelection(plan_position);
ArrayAdapter arrayAdapter_month = new ArrayAdapter(this,R.layout.layout_spinner,R.id.spinner_text,months);
spinner_month.setAdapter(arrayAdapter_month);
spinner_month.setSelection(plan_month);
progressDialog.dismiss();
}
};
Handler pdCanceller = new Handler();
pdCanceller.postDelayed(progressRunnable, 2000);
spinner_plan.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener()
{
public void onItemSelected(AdapterView<?> parent, View view, int position, long id)
{
selectedItem = parent.getItemAtPosition(position).toString();
int selectPosition = parent.getSelectedItemPosition();
Log.e("plan_position_1",plan_position+"");
Log.e("selectedItem",selectPosition+"");
if (!isChanged)
{
if (selectPosition > plan_position)
{
dialogInterfacePlan("Are You Sure To Change!..");
}
else if (selectPosition < plan_position)
{
AlertDialog.Builder builder = new AlertDialog.Builder(this);
builder.setMessage("You Can't Downgrade.. \n Please Contact Our Customer Care Executive.. \n Thank You..")
.setCancelable(false)
.setPositiveButton("OK", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int id) {
spinner_plan.setSelection(plan_position);
dialog.cancel();
}
});
AlertDialog alert = builder.create();
alert.show();
}
}
else {
if (selectPosition == plan_position)
{
isChanged = true;
dialogInterfacePlan("Are You Sure To Change!..");
}
else if (selectPosition>plan_position)
{
isChanged = true;
dialogInterfacePlan("Are You Sure To Change!..");
}
else if (selectPosition<plan_position) {
AlertDialog.Builder builder = new AlertDialog.Builder(this);
builder.setMessage("You Can't Downgrade.. \n Please Contact Our Customer Care Executive.. \n Thank You..")
.setCancelable(false)
.setNegativeButton("OK", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int id) {
isChanged = true;
spinner_plan.setSelection(changed_plan_position);
dialog.cancel();
}
});
AlertDialog alert = builder.create();
alert.show();
}
}
} // to close the onItemSelected
public void onNothingSelected(AdapterView<?> parent)
{
}
});
spinner_month.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener()
{
public void onItemSelected(AdapterView<?> parent, View view, int position, long id)
{
int selectPosition = parent.getSelectedItemPosition();
if (!isMonthChanged)
{
if (selectPosition>plan_month)
{
dialogInterfaceMonth("Are You Sure To Change?..");
}
}
else
{
if (selectPosition == plan_month){
isChanged = true;
dialogInterfaceMonth("Are You Sure To Change?..");
}
else if (selectPosition > changed_month_position){
isChanged = true;
dialogInterfaceMonth("Are You Sure To Change?..");
}
else if (selectPosition<changed_month_position) {
isChanged = true;
dialogInterfaceMonth("Are You Sure To Change?..");
}
}
} // to close the onItemSelected
public void onNothingSelected(AdapterView<?> parent)
{
}
});
}
public void dialogInterfacePlan(String text)
{
AlertDialog.Builder builder = new AlertDialog.Builder(this);
builder.setMessage(text)
.setCancelable(false)
.setPositiveButton("Yes", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int id) {
changed_plan_position = Arrays.asList(plans).indexOf(selectedItem);
isChanged = true;
Log.e("After Changed",plan);
Log.e("After Changed",changed_plan_position+"");
}
})
.setNegativeButton("No", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialogInterface, int i) {
if (isChanged) {
spinner_plan.setSelection(changed_plan_position);
dialogInterface.cancel();
}
else
{
spinner_plan.setSelection(plan_position);
dialogInterface.cancel();
}
}
});
AlertDialog alert = builder.create();
alert.show();
}
public void dialogInterfaceMonth(String text)
{
AlertDialog.Builder builder = new AlertDialog.Builder(this);
builder.setMessage(text)
.setCancelable(false)
.setPositiveButton("Yes", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int id) {
String change_month = spinner_month.getSelectedItem().toString();
changed_month_position = Arrays.asList(months).indexOf(change_month);
isMonthChanged = true;
if (changed_month_position == 0)
{
spinner_month.setSelection(changed_month_position);
}
else if (changed_month_position == 1)
{
spinner_month.setSelection(changed_month_position);
}
else if (changed_month_position == 2)
{
spinner_month.setSelection(changed_month_position);
}
else
{
spinner_month.setSelection(changed_month_position);
}
}
})
.setNegativeButton("No", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialogInterface, int i) {
if (isChanged) {
spinner_month.setSelection(changed_month_position);
dialogInterface.cancel();
}
else
{
spinner_month.setSelection(plan_month);
dialogInterface.cancel();
}
}
});
AlertDialog alert = builder.create();
alert.show();
}
}
答案 0 :(得分：1)
由于行 -
，您看到对话框两次spinner_plan.setSelection(plan_position);
这会触发对OnItemSelectedListener的调用，再次显示该对话框
您可以使用简单的布尔变量来控制何时显示对话框。
希望这有帮助 -
boolean isChanged = false;
boolean isMonthChanged = false;
boolean shouldShowDialog=true;
.......
将听众更新为此 -
spinner_plan.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {
selectedItem = parent.getItemAtPosition(position).toString();
final int selectPosition = parent.getSelectedItemPosition();
Log.e("plan_position_1", plan_position + "");
Log.e("selectedItem", selectPosition + "");
if(shouldShowDialog){
if (!isChanged) {
if (selectPosition > plan_position) {
dialogInterfacePlan("Are You Sure To Change!..");
} else if (selectPosition < plan_position) {
AlertDialog.Builder builder = new AlertDialog.Builder(MainActivity.this);
builder.setMessage("You Can't Downgrade.. \n Please Contact Our Customer Care Executive.. \n Thank You..")
.setCancelable(false)
.setPositiveButton("OK", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int id) {
spinner_plan.setSelection(plan_position);
shouldShowDialog = false;
dialog.cancel();
}
});
AlertDialog alert = builder.create();
alert.show();
}
} else {
if (selectPosition == plan_position) {
isChanged = true;
dialogInterfacePlan("Are You Sure To Change!..");
} else if (selectPosition > plan_position) {
isChanged = true;
dialogInterfacePlan("Are You Sure To Change!..");
} else if (selectPosition < plan_position) {
AlertDialog.Builder builder = new AlertDialog.Builder(MainActivity.this);
builder.setMessage("You Can't Downgrade.. \n Please Contact Our Customer Care Executive.. \n Thank You..")
.setCancelable(false)
.setNegativeButton("OK", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int id) {
isChanged = true;
spinner_plan.setSelection(changed_plan_position);
shouldShowDialog = false;
dialog.cancel();
}
});
AlertDialog alert = builder.create();
alert.show();
}
}
}
shouldShowDialog = true;
} // to close the onItemSelected
public void onNothingSelected(AdapterView<?> parent) {
}
});
和方法dialogInterfacePlan到此 -
public void dialogInterfacePlan(String text) {
AlertDialog.Builder builder = new AlertDialog.Builder(this);
builder.setMessage(text)
.setCancelable(false)
.setPositiveButton("Yes", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int id) {
changed_plan_position = Arrays.asList(plans).indexOf(selectedItem);
isChanged = true;
Log.e("After Changed", plan);
Log.e("After Changed", changed_plan_position + "");
}
})
.setNegativeButton("No", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialogInterface, int i) {
if (isChanged) {
spinner_plan.setSelection(changed_plan_position);
shouldShowDialog=false;
dialogInterface.cancel();
} else {
spinner_plan.setSelection(plan_position);
dialogInterface.cancel();
}
}
});
AlertDialog alert = builder.create();
alert.show();
}