Controller class used to encapsulate the usage of croutons.

CroutonController.java

package your_package;

import android.app.Activity;
import android.app.Application;
import android.content.res.Resources;
import android.os.Bundle;

import cyour_package.R;

import javax.inject.Inject;
import javax.inject.Singleton;

import de.keyboardsurfer.android.widget.crouton.Configuration;
import de.keyboardsurfer.android.widget.crouton.Crouton;
import de.keyboardsurfer.android.widget.crouton.Style;

import static de.keyboardsurfer.android.widget.crouton.Configuration.DURATION_SHORT;

/**
 * Activity scoped controller used to show "croutons" for confirmation, warning and error messages.
 *
 * @author Sebastian Engel
 */
@Singleton
public class CroutonController {

    private final Activity activity;
    private Style confirmationStyle;
    private Style warningStyle;
    private Style errorStyle;

    @Inject
    public CroutonController(Activity activity) {
        this.activity = activity;

        initCroutonStyles();
        ensureProperCleanup();
    }

    ///////////////////////////////////////////////////////////////////////////
    // Public behavior
    ///////////////////////////////////////////////////////////////////////////

    public void showConfirmationMessage(String message) {
        Crouton.showText(activity, message, confirmationStyle);
    }

    public void showWarningMessage(String message) {
        Crouton.showText(activity, message, warningStyle);
    }

    public void showErrorMessage(String message) {
        Crouton.showText(activity, message, errorStyle);
    }

    ///////////////////////////////////////////////////////////////////////////
    // Internal behavior
    ///////////////////////////////////////////////////////////////////////////

    private void initCroutonStyles() {
        Resources resources = activity.getResources();

        confirmationStyle = new Style.Builder()
                .setConfiguration(new Configuration.Builder().setDuration(DURATION_SHORT).build())
                .setHeightDimensionResId(R.dimen.crouton_height)
                .setBackgroundColorValue(resources.getColor(R.color.crouton_confirmation_background))
                .build();

        warningStyle = new Style.Builder()
                .setConfiguration(new Configuration.Builder().setDuration(DURATION_SHORT).build())
                .setHeightDimensionResId(R.dimen.crouton_height)
                .setBackgroundColorValue(resources.getColor(R.color.crouton_warning_background))
                .build();

        errorStyle = new Style.Builder()
                .setConfiguration(new Configuration.Builder().setDuration(DURATION_SHORT).build())
                .setHeightDimensionResId(R.dimen.crouton_height)
                .setBackgroundColorValue(resources.getColor(R.color.crouton_error_background))
                .build();
    }

    private void ensureProperCleanup() {
        // See https://github.com/keyboardsurfer/Crouton#important
        // See https://github.com/keyboardsurfer/Crouton/issues/24

        Application app = activity.getApplication();
        app.registerActivityLifecycleCallbacks(new Application.ActivityLifecycleCallbacks() {
            @Override public void onActivityCreated(Activity activity, Bundle savedInstanceState) {}
            @Override public void onActivityStarted(Activity activity) {}
            @Override public void onActivityResumed(Activity activity) {}
            @Override public void onActivityPaused(Activity activity) {}
            @Override public void onActivityStopped(Activity activity) {}
            @Override public void onActivitySaveInstanceState(Activity activity, Bundle outState) {}
            @Override public void onActivityDestroyed(Activity activity) {
                Crouton.cancelAllCroutons();
                Crouton.clearCroutonsForActivity(activity);
            }
        });
    }

}