Question

遇到问题

在布局上有2个微调器，并希望得到这个微调器的依赖性结构

String[] main={"Moscov","LosAngeles","Pekin"};
String[] one={"1","2","3","4"};
String[] two={"2","2","5","8"};
String[] tree={"5","7","3","2"};

为具有主数组的第一个微调器创建第一个适配器。并且依赖于项目选择必须克服具有依赖于选择的阵列的适配器如果是第1项，那么适配器包含数组1，如果第2项则是数组2

Answer 1

您将创建spinner，并根据第一个Adapter上spinner的选择，为第二个onItemSelected设置Spinner。像

这样的东西

@Override
public void onItemSelected(AdapterView<?> spinner, View view, int position,long arg3)
{
        TextView tv = (TextView)view;  // convert the view to TextView
        String selected = tv.getText().toString();
        if (selected.equals("Moscov"))
        {
            // set the Adapter here with the first set of values
        }
        else if(selected.equals("LosAngeles"))
        {
            // set the Adapter here with the second set of values
        }
        else
        {
            // set the Adapter here with the third set of values
        }
}

如果您将position放入String Arrays，也可以使用可能更具可扩展性的ArrayList。

Answer 2

@Override
public void onItemSelected(AdapterView<?> spinner, View view, int position,long arg3)
{

      switch(position) 
       { 
         case : 0;
       // called first array
        break;

       case : 1;
      // called second array
       break;
    }
}

Answer 3

检查此代码段，在此微调器2的值中依赖于微调器1

public class MainActivity extends Activity {

Spinner s1,s2;
Button btn;
String s;
TextView tv;
ArrayAdapter<String> adap1,adap2,adap3; 
@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    s1=(Spinner)findViewById(R.id.spinner1);
    s2=(Spinner)findViewById(R.id.spinner2);
    btn=(Button)findViewById(R.id.button1);
    tv=(TextView)findViewById(R.id.tv1);


    String[] v1=getResources().getStringArray(R.array.c1);
    String[] v2=getResources().getStringArray(R.array.c2);
    String[] v3=getResources().getStringArray(R.array.c3);

    adap1=new ArrayAdapter<String>(this, android.R.layout.simple_spinner_item, v1);
    adap2=new ArrayAdapter<String>(this, android.R.layout.simple_spinner_item, v2);
    adap3=new ArrayAdapter<String>(this, android.R.layout.simple_spinner_item, v3);

}


@Override
public boolean onCreateOptionsMenu(Menu menu) {
    // Inflate the menu; this adds items to the action bar if it is present.
    getMenuInflater().inflate(R.menu.main, menu);
    return true;
}
public class ItemSelectedListenerr implements OnItemSelectedListener  {

    String[] v=getResources().getStringArray(R.array.c1);
    public String s;
    @Override
    public void onItemSelected(AdapterView<?> arg0, View arg1, int arg2,
            long arg3) {
        // TODO Auto-generated method stub

        s=arg0.getItemAtPosition(arg2).toString();
        if(arg2==0)
        {
            s2.setAdapter(adap1);
        }
        if(arg2==1)
        {
            s2.setAdapter(adap2);
        }
        if(arg2==2)
        {
            s2.setAdapter(adap3);
        }

        tv.setText(s);
        Log.i("hahaha", "item selected is"+s);

    }


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

    }

}

}

我希望这会帮助你。：）

spinner数据依赖于android

3 个答案: