在Android中创建动态微调框

Question

我想创建三个微调框。在第一个Spinner中，我必须显示国家名称，根据国家名称的选择，我必须在第二个Spinner中加载该国家的州名称，并根据州的选择，我必须在第三个Spinner中加载该州的城市名称。任何人都可以发布任何示例，并请建议哪种技术更好地定义Java或Xml中的微调器数据。

ArrayAdapter<String> dataAdapter = new ArrayAdapter<String>(getActivity(),android.R.layout.simple_spinner_item, locations); 
dataAdapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item); 
s.setAdapter(dataAdapter); 

Answer 1

布局XML

<?xml version="1.0" encoding="utf-8"?> 
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" 
android:layout_width="fill_parent" 
android:layout_height="fill_parent" 
android:orientation="vertical" > 

<!-- Label --> 

<TextView 
    android:layout_width="fill_parent" 
    android:layout_height="wrap_content" 
    android:padding="8dip" 
    android:text="@string/lblAcc" /> 

<!-- Spinner Dropdown --> 

<Spinner 
    android:id="@+id/spinner1" 
    android:layout_width="fill_parent" 
    android:layout_height="wrap_content" 
    android:layout_marginLeft="8dip" 
    android:layout_marginRight="8dip" 
    android:layout_marginTop="10dip" 
    android:entries="@array/acc_type" /> 

<!-- Select Label --> 

<TextView 
    android:layout_width="fill_parent" 
    android:layout_height="wrap_content" 
    android:padding="8dip" 
    android:text="@string/lblSubAcc" /> 

<!-- Spinner Dropdown --> 
<Spinner 
    android:id="@+id/spinner2" 
    android:layout_width="fill_parent" 
    android:layout_height="wrap_content" 
    android:layout_marginTop="10dip" 
    android:layout_marginLeft="8dip" 
    android:layout_marginRight="8dip" 
/> 

资源XML，应该像下面

<?xml version="1.0" encoding="utf-8"?> 
<resources> 

<string name="app_name">Spinner Example</string> 
<string name="action_settings">Settings</string> 
<string name="lblAcc">Select Account Type</string> 
<string name="lblSubAcc">Select Account Head</string> 

<string-array name="acc_type"> 
    <item>Income</item> 
    <item>Expense</item> 
</string-array> 

</resources> 

和Java类中使用

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");//You should add items from db here (first spinner) 

     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");//you should add items from db here(2nd spinner) 

     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 

} 

随着如果其他阶梯，你可以添加更多的微调像第三个微调取决于第二个依此类推。