Question

我是Android的新手，想知道如何在一个页面上拥有4个微调器，但是依赖于彼此的价值。我试图这样做，以便当您选择第一个的值时，例如第二个微调器的值可能会改变，但我需要第三个微调器依赖于第二个微调器的值，与第四个微调器相同取决于第三个微调器的值（因为我有这么多的可能性）。我正确设置了布局我只是无法让我的主类中的代码正常工作。

我在网上发现了类似的内容，描述了如何使用2个微调器，但我需要它有4个。

＆＃13;

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
         
    }
}

＆＃13;

如果有人能给我看一个4个微调器的例子，那就太棒了。提前谢谢！

Answer 1

首先初始化你的四个微调器：

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);

并实施您的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;
   }
}

如何使4个微调器依赖于彼此的值

1 个答案: