问题
I have gone through so much code and tried to figure out what I am doing wrong but i am flunked and am wasting time. It would be pretty simple but I cannot figure it out..
I am developing an android app and need to put 2 spinners on one activity. the second spinner will populate based on the entry selected on the first spinner. Sounds simple right?
So here is what I wanna do. If user selects Mobile, contents from the choosePersonalPlan should be displayed, when users selects Large business chooseLargeBusplan should run and the final entry should invoke chooseSmallMedPlan. All I get is the items from ChooseSmallMedPlan displaying all the time.
heres my code. please let me know wth I am doing wrong!
Java file
package com.example.mobilebillforecaster;
import java.util.ArrayList;
import java.util.List;
import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.Spinner;
import android.widget.AdapterView.OnItemSelectedListener;
public class Du_postpaid extends Activity {
public Spinner catspinner,planspinner3,planspinner1,planspinner2;
protected void onCreate(Bundle mbfSplash) {
super.onCreate(mbfSplash);
setContentView(R.layout.postpaid);
chooseCategory();
choosePersonalPlan();
chooseLargeBusPlan();
chooseSmallMedPlan();
}
public void chooseCategory() {
catspinner = (Spinner) findViewById(R.id.catspinner);
ArrayAdapter<CharSequence> catAdapter = ArrayAdapter.createFromResource(this, R.array.ducategory, android.R.layout.simple_spinner_item);
catAdapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
catspinner.setAdapter(catAdapter);
}
private void choosePersonalPlan(){
planspinner1 = (Spinner) findViewById(R.id.planspinner);
List<String> planlist = new ArrayList<String>();
planlist.add("Elite Regular Plan");
planlist.add("Elite Super Plans");
planlist.add("Emirati Plan");
planlist.add("Pay As You Go");
planlist.add("Visitor Mobile Line");
ArrayAdapter<String> planAdapter1 = new ArrayAdapter<String>(this,
android.R.layout.simple_spinner_item, planlist);
planAdapter1.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
planspinner1.setAdapter(planAdapter1);
}
private void chooseLargeBusPlan(){
planspinner2 = (Spinner) findViewById(R.id.planspinner);
List<String> planlist1 = new ArrayList<String>();
planlist1.add("Premier Plan");
planlist1.add("The Executive Plan");
planlist1.add("Business Circle Plan");
planlist1.add("Business Diamond Plan");
ArrayAdapter<String> planAdapter2 = new ArrayAdapter<String>(this,
android.R.layout.simple_spinner_item, planlist1);
planAdapter2.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
planspinner2.setAdapter(planAdapter2);
}
private void chooseSmallMedPlan(){
planspinner2 = (Spinner) findViewById(R.id.planspinner);
List<String> planlist2 = new ArrayList<String>();
planlist2.add("Business Super Plan");
planlist2.add("Her Business Super Plan");
planlist2.add("Business Circle Plan");
planlist2.add("Pay As you Go® Plus");
ArrayAdapter<String> planAdapter3 = new ArrayAdapter<String>(this,
android.R.layout.simple_spinner_item, planlist2);
planAdapter3.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
planspinner2.setAdapter(planAdapter3);
}
public class planOnClickListener implements OnItemSelectedListener {
@Override
public void onItemSelected(AdapterView<?> parent, View v, int pos,
long id) {
parent.getItemAtPosition(pos);
if (pos==0){
choosePersonalPlan();
}else if (pos==1){
chooseLargeBusPlan();
} else if (pos==2){
chooseSmallMedPlan();
}
}
@Override
public void onNothingSelected(AdapterView<?> arg0) {
// TODO Auto-generated method stub
}
}
}
XML
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:gravity="left" >
<TextView
android:id="@+id/postp"
android:layout_width="130dp"
android:layout_height="50dp"
android:layout_alignParentTop="true"
android:layout_centerHorizontal="true"
android:layout_marginTop="15dp"
android:gravity="center"
android:text="@string/postp"
android:textSize="30dp"
/>
<Spinner
android:id="@+id/catspinner"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_below="@+id/postp"
android:layout_marginTop="25dp"
android:entries="@array/ducategory"
android:prompt="@string/category_prompt"
/>
<Spinner
android:id="@+id/planspinner"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_below="@+id/catspinner" />
</RelativeLayout>
回答1:
Add
catspinner.setOnItemSelectedListener(new planOnClickListener());
to
chooseCategory();
Here's the whole code-
public class TemoActivity extends Activity {
public Spinner catspinner,planspinner3,planspinner1,planspinner2;
protected void onCreate(Bundle mbfSplash) {
super.onCreate(mbfSplash);
setContentView(R.layout.main);
chooseCategory();
choosePersonalPlan();
chooseLargeBusPlan();
chooseSmallMedPlan();
}
public void chooseCategory() {
catspinner = (Spinner) findViewById(R.id.catspinner);
ArrayAdapter<CharSequence> catAdapter = ArrayAdapter.createFromResource(this, R.array.ducategory, android.R.layout.simple_spinner_item);
catAdapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
catspinner.setAdapter(catAdapter);
catspinner.setOnItemSelectedListener(new planOnClickListener());
}
private void choosePersonalPlan(){
planspinner1 = (Spinner) findViewById(R.id.planspinner);
List<String> planlist = new ArrayList<String>();
planlist.add("Elite Regular Plan");
planlist.add("Elite Super Plans");
planlist.add("Emirati Plan");
planlist.add("Pay As You Go");
planlist.add("Visitor Mobile Line");
ArrayAdapter<String> planAdapter1 = new ArrayAdapter<String>(this,
android.R.layout.simple_spinner_item, planlist);
planAdapter1.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
planspinner1.setAdapter(planAdapter1);
}
private void chooseLargeBusPlan(){
planspinner2 = (Spinner) findViewById(R.id.planspinner);
List<String> planlist1 = new ArrayList<String>();
planlist1.add("Premier Plan");
planlist1.add("The Executive Plan");
planlist1.add("Business Circle Plan");
planlist1.add("Business Diamond Plan");
ArrayAdapter<String> planAdapter2 = new ArrayAdapter<String>(this,
android.R.layout.simple_spinner_item, planlist1);
planAdapter2.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
planspinner2.setAdapter(planAdapter2);
}
private void chooseSmallMedPlan(){
planspinner2 = (Spinner) findViewById(R.id.planspinner);
List<String> planlist2 = new ArrayList<String>();
planlist2.add("Business Super Plan");
planlist2.add("Her Business Super Plan");
planlist2.add("Business Circle Plan");
planlist2.add("Pay As you Go® Plus");
ArrayAdapter<String> planAdapter3 = new ArrayAdapter<String>(this,
android.R.layout.simple_spinner_item, planlist2);
planAdapter3.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
planspinner2.setAdapter(planAdapter3);
}
public class planOnClickListener implements OnItemSelectedListener {
@Override
public void onItemSelected(AdapterView<?> parent, View v, int pos,
long id) {
parent.getItemAtPosition(pos);
if (pos==0){
choosePersonalPlan();
}else if (pos==1){
chooseLargeBusPlan();
} else if (pos==2){
chooseSmallMedPlan();
}
}
@Override
public void onNothingSelected(AdapterView<?> arg0) {
// TODO Auto-generated method stub
}
}
}
回答2:
Omit choosePersonalPlan(); chooseLargeBusPlan(); chooseSmallMedPlan();
from onCreate() method
回答3:
In your code you are not setting the planOnClickListener() any where. I thing you forget to set the listener like this catspinner.setOnItemSelectedListener(new planOnClickListener());
来源：https://stackoverflow.com/questions/13749805/using-two-android-spinners-one-dependent-on-the-other