我想过一些不那么优雅的方法来解决这个问题，但我知道我一定遗漏了什么。
我的onItemSelected立即启动，没有与用户进行任何交互，这是不希望的行为。我希望UI能够等到用户选择某样东西后再执行任何操作。
我甚至尝试在onResume()中设置监听器，希望能有所帮助，但它没有。
我怎样才能阻止它在用户可以触摸控件之前发射?
public class CMSHome extends Activity {
private Spinner spinner;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
// Heres my spinner ///////////////////////////////////////////
spinner = (Spinner) findViewById(R.id.spinner);
ArrayAdapter<CharSequence> adapter = ArrayAdapter.createFromResource(
this, R.array.pm_list, android.R.layout.simple_spinner_item);
adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
spinner.setAdapter(adapter);
};
public void onResume() {
super.onResume();
spinner.setOnItemSelectedListener(new MyOnItemSelectedListener());
}
public class MyOnItemSelectedListener implements OnItemSelectedListener {
public void onItemSelected(AdapterView<?> parent,
View view, int pos, long id) {
Intent i = new Intent(CMSHome.this, ListProjects.class);
i.putExtra("bEmpID", parent.getItemAtPosition(pos).toString());
startActivity(i);
Toast.makeText(parent.getContext(), "The pm is " +
parent.getItemAtPosition(pos).toString(), Toast.LENGTH_LONG).show();
}
public void onNothingSelected(AdapterView parent) {
// Do nothing.
}
}
}
设计一种通用的转轮，只需数据输入，由用户选择，优点:
1. 保持旋转样式相同的应用程序。
2. 在任何地方启动旋转器。
3.易于处理链接转轮(重新启动ReuseSpinner与不同的数据)。
我的演示示例:ReuseSpinner
传递数据到ReuseSpinner:
Intent intent = new Intent(MainActivity.this, SpinnerActivity.class);
intent.putExtra(SpinnerActivity.Extra_Resource, arrayList);
startActivityForResult(intent, mRequestCode_select_country_prompt);
获取用户选择:
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
// TODO Auto-generated method stub
super.onActivityResult(requestCode, resultCode, data);
if(requestCode == mRequestCode_select_country && resultCode == RESULT_OK){
if(data != null){
Map.Entry<String,String> entry = (Map.Entry<String,String>) data.getSerializableExtra(SpinnerActivity.Result_Data);
if(entry != null){
Log.i(TAG, String.format("get result -> key:%s , value:%s", entry.getKey(), entry.getValue()));
}
}
}
}
这不是一个完美的解决方案，但如果你喜欢将起始字符串作为一个占位符，你可以添加占位符弹簧值("Day_of_Work_Out")
@Override
public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {
String name = (String) parent.getItemAtPosition(position);
if (name.equals("Day_of_Work_Out")) {
}else {
workOutD = name;
Intent intent = new Intent();
workOutNam = workOutName.getText().toString();
if (workOutNam == null) {
startActivity(intent);
Log.i("NewWorkOutActivity","Name is null");
}else {
Log.i("NewWorkOutActivity","Name Not null");
Toast.makeText(NewWorkOutActivity.this, "Please Select a Day", Toast.LENGTH_LONG).show();
}
}
}
我用最简单的方法做到了:
private AdapterView.OnItemSelectedListener listener;
private Spinner spinner;
onCreate ();
spinner = (Spinner) findViewById(R.id.spinner);
listener = new AdapterView.OnItemSelectedListener() {
@Override
public void onItemSelected(AdapterView<?> adapterView, View view, int position, long l) {
Log.i("H - Spinner selected position", position);
}
@Override
public void onNothingSelected(AdapterView<?> adapterView) {
}
};
spinner.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
@Override
public void onItemSelected(AdapterView<?> adapterView, View view, int i, long l) {
spinner.setOnItemSelectedListener(listener);
}
@Override
public void onNothingSelected(AdapterView<?> adapterView) {
}
});
Done
只是为了补充使用onTouchListener来区分对setOnItemSelectedListener的自动调用(这是Activity初始化的一部分，等等)与实际用户交互触发的对它的调用之间的提示，在尝试了其他一些建议后，我做了以下工作，并发现它用最少的代码行就能很好地工作。
只需要为你的Activity/Fragment设置一个布尔字段:
private Boolean spinnerTouched = false;
然后在你设置你的旋转器的setOnItemSelectedListener之前，设置一个onTouchListener:
spinner.setOnTouchListener(new View.OnTouchListener() {
@Override
public boolean onTouch(View v, MotionEvent event) {
System.out.println("Real touch felt.");
spinnerTouched = true;
return false;
}
});
spinner.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
...
if (spinnerTouched){
//Do the stuff you only want triggered by real user interaction.
}
spinnerTouched = false;
