LogsDialog.java

package ru.ltst.u2020mvp.ui.logs;

import android.app.AlertDialog;
import android.content.Context;
import android.content.Intent;
import android.net.Uri;
import android.widget.ListView;
import android.widget.Toast;

import java.io.File;

import ru.ltst.u2020mvp.data.LumberYard;
import ru.ltst.u2020mvp.util.Intents;
import rx.Subscriber;
import rx.android.schedulers.AndroidSchedulers;
import rx.schedulers.Schedulers;
import rx.subscriptions.CompositeSubscription;

public final class LogsDialog extends AlertDialog {
    private final LumberYard lumberYard;
    private final LogAdapter adapter;

    private CompositeSubscription subscriptions;

    public LogsDialog(Context context, LumberYard lumberYard) {
        super(context);
        this.lumberYard = lumberYard;

        adapter = new LogAdapter(context);

        ListView listView = new ListView(context);
        listView.setTranscriptMode(ListView.TRANSCRIPT_MODE_NORMAL);
        listView.setAdapter(adapter);

        setTitle("Logs");
        setView(listView);
        setButton(BUTTON_NEGATIVE, "Close", (dialog, which) -> {
            // NO-OP.
        });
        setButton(BUTTON_POSITIVE, "Share", (dialog, which) -> {
            share();
        });
    }

    @Override
    protected void onStart() {
        super.onStart();

        adapter.setLogs(lumberYard.bufferedLogs());

        subscriptions = new CompositeSubscription();
        subscriptions.add(lumberYard.logs() //
            .observeOn(AndroidSchedulers.mainThread()) //
            .subscribe(adapter));
    }

    @Override
    protected void onStop() {
        super.onStop();
        subscriptions.unsubscribe();
    }

    private void share() {
        lumberYard.save() //
            .subscribeOn(Schedulers.io()) //
            .observeOn(AndroidSchedulers.mainThread()) //
            .subscribe(new Subscriber<File>() {
                @Override
                public void onCompleted() {
                    // NO-OP.
                }

                @Override
                public void onError(Throwable e) {
                    Toast.makeText(getContext(), "Couldn't save the logs for sharing.", Toast.LENGTH_SHORT)
                            .show();
                }

                @Override
                public void onNext(File file) {
                    Intent sendIntent = new Intent(Intent.ACTION_SEND);
                    sendIntent.setType("text/plain");
                    sendIntent.putExtra(Intent.EXTRA_STREAM, Uri.fromFile(file));
                    Intents.maybeStartChooser(getContext(), sendIntent);
                }
            });
    }
}