Simple email application for Android. Original source code: https://framagit.org/dystopia-project/simple-email
 

131 lines
3.8 KiB

package eu.faircode.email;
/*
This file is part of Safe email.
Safe email is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
NetGuard is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with NetGuard. If not, see <http://www.gnu.org/licenses/>.
Copyright 2018 by Marcel Bokhorst (M66B)
*/
import android.content.Context;
import android.os.Bundle;
import android.util.Log;
import androidx.appcompat.app.AppCompatActivity;
import androidx.fragment.app.Fragment;
import androidx.loader.app.LoaderManager;
import androidx.loader.content.AsyncTaskLoader;
import androidx.loader.content.Loader;
//
// This simple loader is simple to use, but it is also simple to cause bugs that can easily lead to crashes
// Make sure to not access any member in any outer scope from onLoad
//
public abstract class SimpleLoader<T> {
private Context context;
private LoaderManager manager;
public void load(AppCompatActivity activity, int id, Bundle args) {
this.context = activity;
this.manager = LoaderManager.getInstance(activity);
manager.restartLoader(id, args, callbacks).forceLoad();
}
public void load(Fragment fragment, int id, Bundle args) {
this.context = fragment.getContext();
this.manager = LoaderManager.getInstance(fragment);
manager.restartLoader(id, args, callbacks).forceLoad();
}
public T onLoad(Bundle args) throws Throwable {
// Be careful not to access members in outer scopes
return null;
}
public void onLoaded(Bundle args, T data) {
}
public void onException(Bundle args, Throwable ex) {
}
protected Context getContext() {
return context;
}
private static class CommonLoader extends AsyncTaskLoader<Result> {
Bundle args;
SimpleLoader loader;
CommonLoader(Context context) {
super(context);
}
void setArgs(Bundle args, SimpleLoader x) {
this.args = args;
this.loader = x;
}
protected void onStartLoading() {
forceLoad();
}
@Override
public Result loadInBackground() {
Result result = new Result();
try {
result.data = loader.onLoad(args);
} catch (Throwable ex) {
Log.e(Helper.TAG, ex + "\n" + Log.getStackTraceString(ex));
result.ex = ex;
}
return result;
}
}
private LoaderManager.LoaderCallbacks callbacks = new LoaderManager.LoaderCallbacks<Result>() {
@Override
public Loader<Result> onCreateLoader(int id, Bundle args) {
CommonLoader loader = new CommonLoader(context);
loader.setArgs(args, SimpleLoader.this);
return loader;
}
@Override
public void onLoadFinished(Loader<Result> loader, Result data) {
manager.destroyLoader(loader.getId());
CommonLoader common = (CommonLoader) loader;
if (data.ex == null)
onLoaded(common.args, (T) data.data);
else
onException(common.args, data.ex);
common.args = null;
common.loader = null;
manager = null;
}
@Override
public void onLoaderReset(Loader<Result> loader) {
}
};
private static class Result {
Throwable ex;
Object data;
}
}