java - 如何使4个微调器彼此依赖

我是android的新手，想知道如何在页面上放置4个微调器，但又取决于彼此的价值。我正在尝试使之成为一个示例，例如当您选择第一个微调器的值时，第二个微调器的值可能会发生变化，但是我需要第三个微调器来取决于第二个微调器的值，而第四个微调器则与之相同取决于第三个微调器的值(因为我有很多可能性)。我已经正确设置了布局，但是我无法在主类中获取正确的代码。

我在网上找到类似的东西，描述了如何使用2个微调框，但我需要有4个。

package com.bar.example.androidspinnerexample;

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;
import android.widget.Toast;

public class SpinnerEx4Activity extends Activity implements
OnItemSelectedListener{
Spinner s1,s2;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        // TODO Auto-generated method stub
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_spinner_ex4);
        s1 = (Spinner)findViewById(R.id.spinner1);
        s2 = (Spinner)findViewById(R.id.spinner2);
        s1.setOnItemSelectedListener(this);
    }
    @Override
    public void onItemSelected(AdapterView<?> arg0, View arg1, int arg2,
            long arg3) {
        // TODO Auto-generated method stub
        String sp1= String.valueOf(s1.getSelectedItem());
        Toast.makeText(this, sp1, Toast.LENGTH_SHORT).show();
        if(sp1.contentEquals("Income")) {
            List<String> list = new ArrayList<String>();
            list.add("Salary");
            list.add("Sales");
            list.add("Others");
            ArrayAdapter<String> dataAdapter = new ArrayAdapter<String>(this,
                android.R.layout.simple_spinner_item, list);
            dataAdapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
            dataAdapter.notifyDataSetChanged();
            s2.setAdapter(dataAdapter);
        }
        if(sp1.contentEquals("Expense")) {
            List<String> list = new ArrayList<String>();
            list.add("Conveyance");
            list.add("Breakfast");
            list.add("Purchase");
            ArrayAdapter<String> dataAdapter2 = new ArrayAdapter<String>(this,
                android.R.layout.simple_spinner_item, list);
            dataAdapter2.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
            dataAdapter2.notifyDataSetChanged();
            s2.setAdapter(dataAdapter2);
        }

    }
    @Override
    public void onNothingSelected(AdapterView<?> arg0) {
        // TODO Auto-generated method stub

    }
}

如果有人可以向我展示4个微调器的示例，那就太好了。提前致谢!

最佳答案

首先初始化您的四个微调器:

s1 = (Spinner)findViewById(R.id.spinner1);
s2 = (Spinner)findViewById(R.id.spinner2);
s3 = (Spinner)findViewById(R.id.spinner3);
s4 = (Spinner)findViewById(R.id.spinner4);

然后设置监听器:

s1.setOnItemSelectedListener(this);
s2.setOnItemSelectedListener(this);
s3.setOnItemSelectedListener(this);
s4.setOnItemSelectedListener(this);

并实现您的onItemSelected方法，如下所示:

@Override
public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {
   int spinnerId = view.getId();
   switch(spinnerId) {
      case R.id.spinner1:
          // do spinner 1 stuff
          // spinner 1 has changed update spinner 2 here
          break;
      case R.id.spinner2:
          // do spinner 2 stuff
          // spinner 2 has changed update spinner 3 here
          break;
      case R.id.spinner3:
          // do spinner 3 stuff
          // spinner 3 has changed update spinner 4 here
          break;
      case R.id.spinner4:
          // do spinner 4 stuff
          break;
   }
}