Question

我有Spinner可以通过字符串从资源中选择文件，但我希望在Spinner中显示其他名称..现在工作正常，但显示名称pic.jpg ..我想要文本和值

文本

String s = {"picture car" , "picture mobile"}

和值

String[] spinnerValue = {"pic.jpg", "pic2.jpg"};


 spinnerDropDownView =(Spinner)findViewById(R.id.spinner1);
        ArrayAdapter<String> adapter = new ArrayAdapter<>(test.this, android.R.layout.simple_list_item_1, spinnerValue);
        spinnerDropDownView.setAdapter(adapter);

Answer 1

使用具有键值对pojo模型的Spinner适配器请参阅以下代码以获取更多详细信息

步骤1：创建将处理密钥和

的POJO类

@Override
public void serialize(Map<String, Object> value, JsonGenerator gen, SerializerProvider serializers) throws IOException {
    Map<String, Object> adaptedValue = new HashMap<>(value);

    for (Map.Entry<String, Object> e : value.entrySet()) {
        if (e.getValue() instanceof Date) {
            adaptedValue.put(e.getKey() + "[date]", ((Date) e.getValue()).getTime());
            adaptedValue.remove(e.getKey());
        }
    }

    new ObjectMapper().writeValue(gen, adaptedValue);
}

注意：toString（）方法很重要，因为它负责在微调器中显示数据，你可以根据需要修改toString（）

步骤2：准备要在微调器中加载的数据

public class Country {

private String id;
private String name;

public Country(String id, String name) {
    this.id = id;
    this.name = name;
}


public String getId() {
    return id;
}

public void setId(String id) {
    this.id = id;
}

public String getName() {
    return name;
}

public void setName(String name) {
    this.name = name;
}


//to display object as a string in spinner
@Override
public String toString() {
    return name;
}

@Override
public boolean equals(Object obj) {
    if(obj instanceof Country){
        Country c = (Country )obj;
        if(c.getName().equals(name) && c.getId()==id ) return true;
    }

    return false;
}

}

步骤3：最后在微调器的onitemselected侦听器方法中获取所选项的键和值

 private void setData() {

    ArrayList<Country> countryList = new ArrayList<>();
    //Add countries

    countryList.add(new Country("1", "India"));
    countryList.add(new Country("2", "USA"));
    countryList.add(new Country("3", "China"));
    countryList.add(new Country("4", "UK"));

    //fill data in spinner 
    ArrayAdapter<Country> adapter = new ArrayAdapter<Country>(context, android.R.layout.simple_spinner_dropdown_item, countryList);
    spinner_country.setAdapter(adapter);
    spinner_country.setSelection(adapter.getPosition(myItem));//Optional to set the selected item.    
}

设置值并在Spinner中显示Text

1 个答案: