Utils.java

package com.blundell.chromecastexample.app.cast;

import android.app.AlertDialog;
import android.content.Context;
import android.content.DialogInterface;
import android.graphics.Point;
import android.view.Display;
import android.view.WindowManager;
import android.widget.Toast;

import com.blundell.chromecastexample.app.R;
import com.google.sample.castcompanionlibrary.cast.exceptions.CastException;
import com.google.sample.castcompanionlibrary.cast.exceptions.NoConnectionException;
import com.google.sample.castcompanionlibrary.cast.exceptions.TransientNetworkDisconnectionException;

import java.io.IOException;

/**
 * A collection of utility methods, all static.
 */
public class Utils {

    /*
     * Making sure public utility methods remain static
     */
    private Utils() {
    }

    @SuppressWarnings("deprecation")
    /**
     * Returns the screen/display size
     *
     * @param ctx
     * @return
     */
    public static Point getDisplaySize(Context context) {
        WindowManager wm = (WindowManager) context.getSystemService(Context.WINDOW_SERVICE);
        Display display = wm.getDefaultDisplay();
        int width = display.getWidth();
        int height = display.getHeight();
        return new Point(width, height);
    }

    /**
     * Shows an error dialog with a given text message.
     *
     * @param context
     * @param errorString
     */
    public static final void showErrorDialog(Context context, String errorString) {
        new AlertDialog.Builder(context).setTitle(com.blundell.chromecastexample.app.R.string.error)
                .setMessage(errorString)
                .setPositiveButton(R.string.ok, new DialogInterface.OnClickListener() {
                    @Override
                    public void onClick(DialogInterface dialog, int id) {
                        dialog.cancel();
                    }
                })
                .create()
                .show();
    }

    /**
     * Shows an "Oops" error dialog with a text provided by a resource ID
     *
     * @param context
     * @param resourceId
     */
    public static final void showOopsDialog(Context context, int resourceId) {
        new AlertDialog.Builder(context).setTitle(R.string.oops)
                .setMessage(context.getString(resourceId))
                .setPositiveButton(R.string.ok, new DialogInterface.OnClickListener() {
                    @Override
                    public void onClick(DialogInterface dialog, int id) {
                        dialog.cancel();
                    }
                })
                .setIcon(android.R.drawable.ic_dialog_alert)
                .create()
                .show();
    }

    /**
     * A utility method to handle a few types of exceptions that are commonly thrown by the cast
     * APIs in this library. It has special treatments for
     * {@link com.google.sample.castcompanionlibrary.cast.exceptions.TransientNetworkDisconnectionException}, {@link com.google.sample.castcompanionlibrary.cast.exceptions.NoConnectionException} and shows an
     * "Oops" dialog conveying certain messages to the user. The following resource IDs can be used
     * to control the messages that are shown:
     * <p/>
     * <ul>
     * <li><code>R.string.connection_lost_retry</code></li>
     * <li><code>R.string.connection_lost</code></li>
     * <li><code>R.string.failed_to_perfrom_action</code></li>
     * </ul>
     *
     * @param context
     * @param e
     */
    public static void handleException(Context context, Exception e) {
        int resourceId = 0;
        if (e instanceof TransientNetworkDisconnectionException) {
            // temporary loss of connectivity
            resourceId = R.string.connection_lost_retry;

        } else if (e instanceof NoConnectionException) {
            // connection gone
            resourceId = R.string.connection_lost;
        } else if (e instanceof RuntimeException ||
                e instanceof IOException ||
                e instanceof CastException) {
            // something more serious happened
            resourceId = R.string.failed_to_perfrom_action;
        } else {
            // well, who knows!
            resourceId = R.string.failed_to_perfrom_action;
        }
        if (resourceId > 0) {
            showOopsDialog(context, resourceId);
        }
    }

    /**
     * Shows a (long) toast.
     *
     * @param context
     * @param resourceId
     */
    public static void showToast(Context context, int resourceId) {
        Toast.makeText(context, context.getString(resourceId), Toast.LENGTH_LONG).show();
    }

}