我是 Android 的新手，我正在尝试从微调器中获取字符串。我做了一些研究，但找不到任何有用的东西。无需尝试获取 String 代码即可正常工作。这是有效的代码:
assert staticSpinner2 != null;
staticSpinner2.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
@Override
public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {
String spinnerLanguage2 = staticSpinner2.getSelectedItem().toString();
}
public String getSpin(String spinnerLanguage2) {
return spinnerLanguage2;
}
@Override
public void onNothingSelected(AdapterView<?> parent) {
}
});
我尝试使用如下的 getter 方法，但没有出现任何错误:
assert staticSpinner2 != null;
staticSpinner2.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
@Override
public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {
String spinnerLanguage2 = staticSpinner2.getSelectedItem().toString();
}
public String getSpinnerString(String spinnerLanguage2) {
return spinnerLanguage2;
}
@Override
public void onNothingSelected(AdapterView<?> parent) {
}
});
我正在尝试使用以下方法将此字符串设置为 TextView :
assert staticSpinner2 != null;
staticSpinner2.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
@Override
public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {
String spinnerLanguage2 = staticSpinner2.getSelectedItem().toString();
}
public String getSpinnerString(String spinnerLanguage2) {
return spinnerLanguage2;
}
@Override
public void onNothingSelected(AdapterView<?> parent) {
}
});
MainActivityClassName AnObject = new MainActivityClassName();
text.setText(AnObject.getSpinnerString());
我收到一条错误消息“无法解析方法 getSpin()”。我确实意识到我没有将任何参数传递给该方法，但我不知道如何在此处执行此操作。我感谢以不同方式解决问题的任何帮助或任何其他建议。提前致谢。
如果有帮助，这是完整的代码:
public class MainActivity extends AppCompatActivity {
TextView text;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_json);
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
text = (TextView) findViewById(R.id.textView);
// spinner 1
final Spinner staticSpinner1 = (Spinner) findViewById(R.id.spinner1);
// Create an ArrayAdapter using the string array and a default spinner
ArrayAdapter<CharSequence> staticAdapter1 = ArrayAdapter
.createFromResource(this, R.array.lang,
android.R.layout.simple_spinner_item);
// Specify the layout to use when the list of choices appears
staticAdapter1
.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
// Apply the adapter to the spinner
staticSpinner1.setAdapter(staticAdapter1);
// spinner 2
final Spinner staticSpinner2 = (Spinner) findViewById(R.id.spinner2);
staticSpinner1.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
@Override
public void onItemSelected(AdapterView<?> arg0, View arg1,
int arg2, long arg3) {
String spinnerLanguage = staticSpinner1.getSelectedItem().toString();
switch (spinnerLanguage) {
case "Afrikaans":
// Create an ArrayAdapter using the string array and a default spinner
ArrayAdapter<CharSequence> staticAdapterAF = ArrayAdapter
.createFromResource(getBaseContext(), R.array.af,
android.R.layout.simple_spinner_item);
// Specify the layout to use when the list of choices appears
staticAdapterAF
.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
// Apply the adapter to the spinner
staticSpinner2.setAdapter(staticAdapterAF);
break;
case "French":
// Create an ArrayAdapter using the string array and a default spinner
ArrayAdapter<CharSequence> staticAdapterFR = ArrayAdapter
.createFromResource(getBaseContext(), R.array.fr,
android.R.layout.simple_spinner_item);
// Specify the layout to use when the list of choices appears
staticAdapterFR
.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
// Apply the adapter to the spinner
staticSpinner2.setAdapter(staticAdapterFR);
break;
case "English":
// Create an ArrayAdapter using the string array and a default spinner
ArrayAdapter<CharSequence> staticAdapterEN = ArrayAdapter
.createFromResource(getBaseContext(), R.array.en,
android.R.layout.simple_spinner_item);
// Specify the layout to use when the list of choices appears
staticAdapterEN
.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
// Apply the adapter to the spinner
staticSpinner2.setAdapter(staticAdapterEN);
break;
case "Turkish":
// Create an ArrayAdapter using the string array and a default spinner
ArrayAdapter<CharSequence> staticAdapterTR = ArrayAdapter
.createFromResource(getBaseContext(), R.array.tr,
android.R.layout.simple_spinner_item);
// Specify the layout to use when the list of choices appears
staticAdapterTR
.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
// Apply the adapter to the spinner
staticSpinner2.setAdapter(staticAdapterTR);
break;
}
}
@Override
public void onNothingSelected(AdapterView<?> arg0) {
}
});
assert staticSpinner2 != null;
staticSpinner2.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
@Override
public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {
String spinnerLanguage2 = staticSpinner2.getSelectedItem().toString();
}
public String getSpin(String spinnerLanguage2) {
return spinnerLanguage2;
}
@Override
public void onNothingSelected(AdapterView<?> parent) {
}
});
MainActivity AnObject = new MainActivity();
text.setText(AnObject.getSpinnerString());
}
最佳答案
你可以这样做:
String selectedText = null;
staticSpinner2.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
@Override
public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {
selectedText = parent.getItemAtPosition(position).toString();
}
@Override
public void onNothingSelected(AdapterView<?> parent) {
}
});
现在您可以使用 selectedText 变量传递给您想要的任何方法。但是，请记住，除非您在微调器中选择某些内容，否则它的值为 null。
关于java - 如何从 setOnItemSelectedListener 方法获取字符串？，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/36131281/