我有一个偏好类，其中我实现了一些逻辑。我希望能够检测到该首选项何时关闭，以便我可以断开google API客户端。
我的自定义偏好类。一切正常但是当我关闭首选项并再次打开它时，它会显示一个错误，即具有该ID的API客户端已经存在。
我的首选项类代表整个首选项屏幕，它具有位置自动完成文本编辑器。
的preferences.xml
<?xml version="1.0" encoding="utf-8"?>
<PreferenceScreen
xmlns:android="http://schemas.android.com/apk/res/android">
<PreferenceCategory
android:title="Notifications"
android:key="pref_key_storage_settings">
<SwitchPreference
android:key="pref_enable_notifications"
android:title="News notifications"
android:defaultValue="true" />
<EditTextPreference
android:key="pref_confirms_needed"
android:digits="0123456789"
android:inputType="number"
android:title="@string/pref_confirmsNeeded"
android:defaultValue="0"
android:dialogMessage="Enter minimum number of confirms news should have for you to be notified about it."
android:summary="You will be notified only for news that have higher number of confirms than the number you set here." />
<Preference
android:key="pref_location_screen"
android:persistent="false"
android:title="Notification range" />
</PreferenceCategory>
</PreferenceScreen>
我没有显示任何代码，因为我想保持简单。如果您需要，请告诉我！
编辑
我添加了代码
LocationPreference.xml
public class LocationPreference extends Preference implements GoogleApiClient.ConnectionCallbacks, GoogleApiClient.OnConnectionFailedListener {
private static final String TAG = "LocationPreference";
private Context mContext;
private PlaceAutocompleteAdapter mLocationAutocompleteAdapter;
private GoogleApiClient mGoogleApiClient;
private static final LatLngBounds LAT_LNG_BOUNDS = new LatLngBounds(
new LatLng(-40, -168), new LatLng(71, 136));
private View autocompleteSearch;
// widgets
private AutoCompleteTextView mSearchText;
public LocationPreference(Context context) {
super(context);
setLayoutResource(R.layout.location_preference);
mContext = context;
}
public LocationPreference(Context context, AttributeSet attrs)
{
super(context, attrs);
setLayoutResource(R.layout.location_preference);
mContext = context;
}
public LocationPreference(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
setLayoutResource(R.layout.location_preference);
mContext = context;
}
private void init() {
if (mGoogleApiClient == null) {
mGoogleApiClient = new GoogleApiClient
.Builder(mContext)
.addApi(Places.GEO_DATA_API)
.addApi(Places.PLACE_DETECTION_API)
.enableAutoManage((AppCompatActivity) mContext,this)
.build();
}
mLocationAutocompleteAdapter = new PlaceAutocompleteAdapter(
mContext, mGoogleApiClient, LAT_LNG_BOUNDS, null);
mSearchText.setAdapter(mLocationAutocompleteAdapter);
mSearchText.setOnEditorActionListener(new TextView.OnEditorActionListener() {
@Override
public boolean onEditorAction(TextView textView, int i, KeyEvent keyEvent) {
if (i == EditorInfo.IME_ACTION_SEARCH
|| i == EditorInfo.IME_ACTION_DONE
|| keyEvent.getAction() == keyEvent.ACTION_DOWN
|| keyEvent.getAction() == keyEvent.KEYCODE_ENTER) {
//geoLocate();
}
return false;
}
});
}
@Override
protected void finalize() throws Throwable {
super.finalize();
if (mGoogleApiClient != null && mGoogleApiClient.isConnected()) {
mGoogleApiClient.stopAutoManage((AppCompatActivity) mContext);
mGoogleApiClient.disconnect();
}
}
@Override
protected View onCreateView(ViewGroup parent) {
super.onCreateView(parent);
LayoutInflater li = (LayoutInflater) getContext().getSystemService(Context.LAYOUT_INFLATER_SERVICE);
if (autocompleteSearch == null) {
autocompleteSearch = li.inflate(R.layout.location_preference, parent, false);
mSearchText = autocompleteSearch.findViewById(R.id.location_pref_input);
mSearchText.setOnItemClickListener(mAutocompleteClickListener);
init();
}
return autocompleteSearch;
}
private AdapterView.OnItemClickListener mAutocompleteClickListener = new AdapterView.OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> adapterView, View view, int i, long l) {
//hideSoftKeyboard();
Log.d(TAG, "OnItemClick()");
final AutocompletePrediction item = mLocationAutocompleteAdapter.getItem(i);
final String placeId = item.getPlaceId();
PendingResult<PlaceBuffer> placeResult = Places.GeoDataApi
.getPlaceById(mGoogleApiClient, placeId);
placeResult.setResultCallback(mUpdatePlaceDetailsCallback);
}
};
private ResultCallback<PlaceBuffer> mUpdatePlaceDetailsCallback = new ResultCallback<PlaceBuffer>() {
@Override
public void onResult(@NonNull PlaceBuffer places) {
Log.d(TAG, "onResult()");
if(!places.getStatus().isSuccess()){
Log.d(TAG, "onResult: Place query did not complete successfully: " + places.getStatus().toString());
places.release();
return;
}
final Place place = places.get(0);
persistString(CommonUtils.latLngToStr(place.getViewport().getCenter().latitude,
place.getViewport().getCenter().longitude));
SharedPreferences preferences = PreferenceManager.getDefaultSharedPreferences(mContext);
Map<String, ?> allEntries = preferences.getAll();
for (Map.Entry<String, ?> entry : allEntries.entrySet()) {
Log.d(TAG, entry.getKey() + ": " + entry.getValue().toString());
}
places.release();
}
};
@Override
public void onConnectionFailed(@NonNull ConnectionResult connectionResult) {
}
@Override
public void onConnected(@Nullable Bundle bundle) {
}
@Override
public void onConnectionSuspended(int i) {
Log.i(TAG, "Connection suspended");
mGoogleApiClient.connect();
}
}
Aaditi
我认为我最好的办法就是检查Google Api客户端是否存在。
真的需要查看您的代码并更清楚地了解您要执行的操作。
但是，如果您在用户关闭偏好设置时尝试关闭所有内容，主要是返回到应用主屏幕，您可以尝试断开Google API客户端的连接。 onBackPressed活动calllback
@Override
public void onBackPressed()
{
super.onBackPressed();
// Do your stuff here.
}
实际上，你冷得更深，并在onBackPressed之后触发的Destroy回调中执行
@Override
public void onDestroy()
{
super.onDestroy();
// Do your stuff here.
}
在返回您的应用活动之前，这应该是最后一次回调。哦，对不起，对于偏好，请尝试onPrepareForRemoval回调
@Override
public void onPrepareForRemoval()
{
super.onPrepareForRemoval();
// Close the google api here.
}
然后，如果这不起作用，请尝试将Google API关闭/断开连接到PreferenceActivity onDestroy回调。
我个人建议重构代码以使用PreferenceFragment而不是Preference。