Audinaut-subsonic-app-android/app/src/main/java/net/nullsum/audinaut/util/LoadingTask.java

package net.nullsum.audinaut.util;

import android.app.Activity;
import android.app.ProgressDialog;

import net.nullsum.audinaut.activity.SubsonicActivity;

/**
 * @author Sindre Mehus
 * @version $Id$
 */
public abstract class LoadingTask<T> extends BackgroundTask<T> {

    private final Activity tabActivity;
    private final boolean cancellable;
    private ProgressDialog loading;

    public LoadingTask(Activity activity) {
        super(activity);
        tabActivity = activity;
        this.cancellable = true;
    }

    public LoadingTask(Activity activity, final boolean cancellable) {
        super(activity);
        tabActivity = activity;
        this.cancellable = cancellable;
    }

    @Override
    public void execute() {
        loading = ProgressDialog.show(tabActivity, "", "Loading. Please Wait...", true, cancellable, dialog -> cancel());

        queue.offer(task = new Task() {
            @Override
            public void onDone(T result) {
                if (loading.isShowing()) {
                    loading.dismiss();
                }
                done(result);
            }

            @Override
            public void onError(Throwable t) {
                if (loading.isShowing()) {
                    loading.dismiss();
                }
                error(t);
            }
        });
    }

    @Override
    public boolean isCancelled() {
        return (tabActivity instanceof SubsonicActivity && ((SubsonicActivity) tabActivity).isDestroyedCompat()) || cancelled.get();
    }

    @Override
    public void updateProgress(final String message) {
        if (!cancelled.get()) {
            getHandler().post(() -> loading.setMessage(message));
        }
    }
}