我得到了答案,希望它能帮助像我这样的人......
不要像我在上面的代码中那样在创建首选项时提及意图。在 OnPreferenceClickListener 上提及意图,然后执行 StartActivityForResult()
// Intent preference
DevicePref = getPreferenceManager().createPreferenceScreen(this);
// Show a Screen with list of Devices Discovered
DevicePref.setOnPreferenceClickListener(onPreferenceClick);
DevicePref.setTitle("Select Device");
DevicePref.setSummary(mSelectedDevice);
deviceOptionsCat.addPreference(DevicePref);
然后创建 OnPreferenceClickListner 并在此处执行 StartActivityFromResult()
OnPreferenceClickListener onPreferenceClick = new Preference.OnPreferenceClickListener() {
public boolean onPreferenceClick(Preference preference) {
if (preference ==DevicePref )
{
Intent i = new Intent(DevuiceOptions.this,getDevice.class);
DevicePref.setIntent(i);
startActivityForResult(i,CHOOSE_DEVICE);
}
return true;
}
};
最后得到结果句柄 onActivityResult 并更新 Summary 字段。
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data)
{
switch (requestCode) {
case Constants.CHOOSE_DEVICE:
{
if (data!=null )
{
Bundle b = data.getExtras();
mSelectedDevice = (String) b.get("Name");
UpdatePreferences();
}
}
}
}
谢谢