Java tutorial
/* * Copyright (c) 2017 dmfs GmbH * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ package com.smoothsync.smoothsetup.microfragments; import android.content.Context; import android.os.AsyncTask; import android.os.Bundle; import android.os.Handler; import android.os.Parcel; import android.support.annotation.NonNull; import android.support.annotation.Nullable; import android.support.v4.app.Fragment; import android.view.LayoutInflater; import android.view.View; import android.view.ViewGroup; import com.smoothsync.api.SmoothSyncApi; import com.smoothsync.api.model.Provider; import com.smoothsync.smoothsetup.ProvidersLoadTask; import com.smoothsync.smoothsetup.R; import com.smoothsync.smoothsetup.services.FutureApiServiceConnection; import com.smoothsync.smoothsetup.services.SmoothSyncApiProxy; import com.smoothsync.smoothsetup.utils.AsyncTaskResult; import com.smoothsync.smoothsetup.utils.ThrowingAsyncTask; import org.dmfs.android.bolts.service.FutureServiceConnection; import org.dmfs.android.microfragments.FragmentEnvironment; import org.dmfs.android.microfragments.MicroFragment; import org.dmfs.android.microfragments.MicroFragmentEnvironment; import org.dmfs.android.microfragments.MicroFragmentHost; import org.dmfs.android.microfragments.Timestamp; import org.dmfs.android.microfragments.timestamps.UiTimestamp; import org.dmfs.android.microfragments.transitions.ForwardTransition; import org.dmfs.android.microfragments.transitions.XFaded; import org.dmfs.android.microwizard.MicroWizard; import org.dmfs.android.microwizard.box.Unboxed; import org.dmfs.optional.NullSafe; import org.dmfs.optional.Optional; import java.util.List; /** * A {@link MicroFragment} that loads a provider by its id before moving on to a setup step. * * @author Marten Gajda */ public final class ProvidersLoadMicroFragment implements MicroFragment<ProvidersLoadMicroFragment.Params> { public final static Creator<ProvidersLoadMicroFragment> CREATOR = new Creator<ProvidersLoadMicroFragment>() { @Override public ProvidersLoadMicroFragment createFromParcel(Parcel source) { return new ProvidersLoadMicroFragment(new NullSafe<>(source.readString()), new Unboxed<MicroWizard<ChooseProviderMicroFragment.ProviderSelection>>(source).value()); } @Override public ProvidersLoadMicroFragment[] newArray(int size) { return new ProvidersLoadMicroFragment[size]; } }; @Nullable private final Optional<String> mAccount; private final MicroWizard<ChooseProviderMicroFragment.ProviderSelection> mNext; protected interface Params { Optional<String> username(); MicroWizard<ChooseProviderMicroFragment.ProviderSelection> next(); } /** * Create a {@link ProvidersLoadMicroFragment} that loads the provider with the given id. * * @param account * An optional account identifier to set up. * @param next */ public ProvidersLoadMicroFragment(@Nullable Optional<String> account, MicroWizard<ChooseProviderMicroFragment.ProviderSelection> next) { mAccount = account; mNext = next; } @NonNull @Override public String title(@NonNull Context context) { return context.getString(R.string.smoothsetup_wizard_title_loading); } @Override public boolean skipOnBack() { return true; } @NonNull @Override public Fragment fragment(@NonNull Context context, @NonNull MicroFragmentHost host) { return new LoadFragment(); } @NonNull @Override public Params parameter() { return new Params() { @Override public Optional<String> username() { return mAccount; } @Override public MicroWizard<ChooseProviderMicroFragment.ProviderSelection> next() { return mNext; } }; } @Override public int describeContents() { return 0; } @Override public void writeToParcel(Parcel dest, int flags) { dest.writeString(mAccount.value(null)); dest.writeParcelable(mNext.boxed(), flags); } public final static class LoadFragment extends Fragment implements ThrowingAsyncTask.OnResultCallback<List<Provider>> { private final static int DELAY_WAIT_MESSAGE = 2500; private final Runnable mShowWaitMessage = new Runnable() { @Override public void run() { getView().findViewById(android.R.id.message).animate().alpha(1f).start(); } }; private Handler mHandler = new Handler(); private FutureServiceConnection<SmoothSyncApi> mApiService; private MicroFragmentEnvironment<Params> mMicroFragmentEnvironment; private Timestamp mTimestamp = new UiTimestamp(); @Override public void onCreate(@Nullable Bundle savedInstanceState) { super.onCreate(savedInstanceState); mMicroFragmentEnvironment = new FragmentEnvironment<>(this); mApiService = new FutureApiServiceConnection(getActivity()); } @Override public void onResume() { super.onResume(); new ProvidersLoadTask(new SmoothSyncApiProxy(mApiService), this) .executeOnExecutor(AsyncTask.THREAD_POOL_EXECUTOR); } @Nullable @Override public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) { View result = inflater.inflate(R.layout.smoothsetup_microfragment_loading, container, false); mHandler.postDelayed(mShowWaitMessage, DELAY_WAIT_MESSAGE); return result; } @Override public void onDestroyView() { mHandler.removeCallbacks(mShowWaitMessage); super.onDestroyView(); } @Override public void onDestroy() { mApiService.disconnect(); super.onDestroy(); } @Override public void onResult(final AsyncTaskResult<List<Provider>> result) { if (!isResumed()) { return; } try { List<Provider> providers = result.value(); mMicroFragmentEnvironment.host().execute(getActivity(), new XFaded( new ForwardTransition<>(mMicroFragmentEnvironment.microFragment().parameter().next() .microFragment(getActivity(), new ChooseProviderMicroFragment.ProviderSelection() { @NonNull @Override public Provider[] providers() { return providers.toArray(new Provider[providers.size()]); } @NonNull @Override public Optional<String> username() { return mMicroFragmentEnvironment.microFragment().parameter().username(); } })))); } catch (Exception e) { mMicroFragmentEnvironment.host().execute(getActivity(), new XFaded(new ForwardTransition<>( new ErrorRetryMicroFragment(getString(R.string.smoothsetup_error_load_provider)), mTimestamp))); } } } }