给用户第一印象---应用启动界面

作为与用户的第一次亲密接触

splash界面的作用：

1、展现App的Logo，给用户的第一印象；一般包括图标和应用名称，或者加一句标语

2、应用程序初始化的操作；如初始化网络，或者获取用户位置信息，设备信息等
3、检查应用程序的版本；用于提醒版本更新等操作
4、检查当前应用程序是否合法注册；

public class AppUtil {

	/**
	 * 获取应用程序名称
	 */
	public static String getAppName(Context context) {
		try {
			PackageManager packageManager = context.getPackageManager();
			PackageInfo packageInfo = packageManager.getPackageInfo(context.getPackageName(), 0);
			int labelRes = packageInfo.applicationInfo.labelRes;
			return context.getResources().getString(labelRes);
		} catch (NameNotFoundException e) {
			e.printStackTrace();
		}
		return null;
	}

	/**
	 * [获取应用程序版本名称信息]
	 * @param context
	 * @return 当前应用的版本名称
	 */
	public static String getVersionName(Context context) {
		try {
			PackageManager packageManager = context.getPackageManager();
			PackageInfo packageInfo = packageManager.getPackageInfo(context.getPackageName(), 0);
			return packageInfo.versionName;
		} catch (NameNotFoundException e) {
			e.printStackTrace();
		}
		return null;
	}

}

 /** 弹出更新对话框
	 */
	private void showUpdate() {
		Builder builder = new Builder(this);
		builder.setTitle("发现新版本");
		builder.setMessage(Update.DESCRIPTION);
		builder.setPositiveButton("立即下载", new OnClickListener() {
			public void onClick(DialogInterface dialog, int which) {
				startService(new Intent(SplashActivity.this, UpdateService.class));
				handler.sendEmptyMessage(ENTER_HOME);
			}
		});
		builder.setNegativeButton("以后再说", new OnClickListener() {
			public void onClick(DialogInterface dialog, int which) {
				handler.sendEmptyMessage(ENTER_HOME);
			}
		});
		builder.show();
	};

/**通知栏后台下载apk的服务*/
public class UpdateService extends Service {

	// 标题
	private int titleId = R.string.app_name;

	// 文件存储
	private File updateDir = null;
	private File updateFile = null;

	// 通知栏
	private NotificationManager updateNotificationManager = null;
	private Notification updateNotification = null;

	private RemoteViews remoteViews;// 状态栏通知显示的view

	@Override
	public IBinder onBind(Intent intent) {
		return null;
	}

	@Override
	public int onStartCommand(Intent intent, int flags, int startId) {
		System.out.println("开始下载");
		// 创建文件
		if (Environment.MEDIA_MOUNTED.equals(Environment.getExternalStorageState())) {
			updateDir = new File(Environment.getExternalStorageDirectory().getAbsolutePath());
			updateFile = new File(updateDir.getPath(), getResources().getString(titleId) + ".apk");
		}

		// 创建通知栏
		this.updateNotificationManager = (NotificationManager) getSystemService(NOTIFICATION_SERVICE);
		this.updateNotification = new Notification();
		this.updateNotification.flags |= Notification.FLAG_AUTO_CANCEL;
		// 通知栏视图
		remoteViews = new RemoteViews(getPackageName(), R.layout.notification_update);
		remoteViews.setImageViewResource(R.id.iv_update_icon, R.drawable.ic_launcher);
		updateNotification.contentView = remoteViews;
		updateNotification.icon = R.drawable.ic_launcher;// 设置通知消息的图标
		updateNotification.tickerText = "正在下载。。。";// 设置通知消息的标题
		// 发出通知
		updateNotificationManager.notify(0, updateNotification);

		// 下载apk
		FinalHttp http = new FinalHttp();
		String url = Update.APKURL;
		http.download(url, updateFile.getAbsolutePath(), new AjaxCallBack<File>() {
			@Override
			public void onFailure(Throwable t, int errorNo, String strMsg) {
				// 下载失败
				remoteViews.setTextViewText(R.id.tv_update_text, "下载失败");
				remoteViews.setProgressBar(R.id.pb_update_progress, 100, 30, false);
				updateNotification.contentView = remoteViews;
				updateNotificationManager.notify(0, updateNotification);
				// 停止服务
				stopSelf();
				super.onFailure(t, errorNo, strMsg);
			}

			@Override
			public void onLoading(long count, long current) {
				int progress = (int) (current * 100 / count);
				remoteViews.setTextViewText(R.id.tv_update_text, "已下载" + progress + "%");
				remoteViews.setProgressBar(R.id.pb_update_progress, 100, (int) progress, false);
				updateNotification.contentView = remoteViews;
				updateNotificationManager.notify(0, updateNotification);
				super.onLoading(count, current);
			}

			@Override
			public void onSuccess(File t) {
				// 点击安装PendingIntent
				Uri uri = Uri.fromFile(t);
				Intent installIntent = new Intent(Intent.ACTION_VIEW);
				installIntent.setDataAndType(uri, "application/vnd.android.package-archive");
				PendingIntent updatePendingIntent = PendingIntent.getActivity(UpdateService.this, 0, installIntent, 0);

				updateNotification.defaults = Notification.DEFAULT_SOUND;// 铃声提醒
				remoteViews.setTextViewText(R.id.tv_update_text, "下载完成，点击安装");
				remoteViews.setProgressBar(R.id.pb_update_progress, 100, 100, false);
				updateNotification.contentView = remoteViews;
				updateNotification.setLatestEventInfo(getApplicationContext(), "APP", "下载完成，点击安装", updatePendingIntent);
				updateNotificationManager.notify(0, updateNotification);
				// 停止服务
				stopSelf();
				super.onSuccess(t);
			}
		});
		return super.onStartCommand(intent, flags, startId);
	}

}