Android中,一些用于统一管理的类,比如 log,比如 toast,比如 url等(toast篇)

用于显示单例的toast,还是很简单的,一个类即可:

/**
 * @author tyxo
 * @qq 1577441454
 * @date 2015/6/3 12:02
 * @desc 显示单例的吐司，能连续快速弹的吐司
 */
public class ToastUtil {

    private static Toast toast;

    /*public static void showToastS(String text) {
        if (toast == null) {
            toast = Toast.makeText(MyApp.getAppContext(), text, Toast.LENGTH_SHORT);
        }
        toast.setText(text);
        toast.show();
    }*/

    public static void showToastS(Context mContext, String text) {
        if (toast == null) {
            toast = Toast.makeText(mContext, text, Toast.LENGTH_SHORT);
        }
        toast.setText(text);
        toast.show();
    }


    /*public static void showToastS(MyApp myApp, String text, String activityName) {
        if (AndroidUtil.isCurrentActivityTop(myApp, activityName)) {
            if (toast == null) {
                toast = Toast.makeText(myApp, text, Toast.LENGTH_SHORT);
            }
            toast.setText(text);
            toast.show();
        }
    }*/

    /*public static void showToastL(String text) {
        if (toast == null) {
            toast = Toast.makeText(MyApp.getAppContext(), text, Toast.LENGTH_LONG);
        }
        toast.setText(text);
        toast.show();
    }*/

    /*public static void showToastL(MyApp myApp, String text) {
        if (toast == null) {
            toast = Toast.makeText(myApp, text, Toast.LENGTH_LONG);
        }
        toast.setText(text);
        toast.show();
    }*/
}

当我们使用的时候,直接ToastUtil.showS(context,"要吐的内容").

可能有的童鞋对上面注释的第一个方法有疑问,为啥不传context可以直接显示toast呢?

这里有个Application的全局类,在一个应用(即一个app)中,系统内会自动创建一个全局的application类,(想要细了解的请找度娘),可以在这个类里面保存一些配置的值,在整个应用中,无论是哪个类都可以获取到application内保存的值,这个类可以自己继承系统的,然后做一些修改,

作为父类的application:

public class BaseApplication extends Application {

	@Override
	public void onCreate() {
		super.onCreate();
		instance = this;
	}

	private static BaseApplication instance;

	public static BaseApplication getInstance() {
		return instance;
	}
}

application具体实现类:

public class MyApp extends BaseApplication {

    private boolean isLogin;
    private static PlatUser mCurrentUser;
    private static MyApp singleton;
    private static Context mContext;
    public static String AppName = "ENT_PLAT_APP";
    public static final String USER_DATA_FILE = "user_data";
    private static final String TAG_FOR_LOGGER = "Logger";

    /**
     * 初始化事件（重载）
     */
    @Override
    public void onCreate() {
        super.onCreate();

        singleton = this;
        mContext = getApplicationContext();
        Logger.init(TAG_FOR_LOGGER).setLogLevel(LogLevel.FULL);                                        //日志打印.hideThreadInfo()
        //创建默认的ImageLoader配置参数
        ImageLoaderConfiguration configuration = ImageLoaderConfiguration.createDefault(this);

        //Initialize ImageLoader with configuration.
        ImageLoader.getInstance().init(configuration);

        startService(new Intent(getAppContext(), MonitorUserService.class));

    }

    public static MyApp getInstance() {
        return singleton;
    }

    /** 设置当前登录用户，启动消息监听服务 */
    public void setCurrentUser(PlatUser user) {
        this.mCurrentUser = user;

        if (user != null) {
            JpushManager.getInstance(mContext).initJpush();
            JpushManager.getInstance(mContext).setAlias("ENT_PLAT_APP_" + user.userId);
            HLog.i("tyxo", "用户别名" + "ENT_PLAT_APP_" + user.userId);
        } else {
            JpushManager.getInstance(mContext).stopJpush();
        }
    }

    public PlatUser getCurrentUser() { return this.mCurrentUser; }

    public boolean isLogin() {
        return isLogin;
    }

    public void setIsLogin(boolean b) {
        isLogin = b;
    }

    public static Context getAppContext() {
        return MyApp.mContext;
    }

    @Override
    public void onTerminate() {
        super.onTerminate();
    }

    public static DisplayMetrics md = null;

    public static DisplayMetrics getDM(Context context) {
        if (md == null) {
            md = new DisplayMetrics();
            WindowManager wm = (WindowManager) context
                    .getSystemService(Context.WINDOW_SERVICE);
            wm.getDefaultDisplay().getMetrics(md);
        }
        return md;
    }

    /**
     * 检查网络状态
     */
    public boolean CheckNetworkState(Context context) {

        ConnectivityManager manager = (ConnectivityManager) this
                .getSystemService(Context.CONNECTIVITY_SERVICE);

        NetworkInfo mMobile = manager
                .getNetworkInfo(ConnectivityManager.TYPE_MOBILE);
        NetworkInfo mWifi = manager
                .getNetworkInfo(ConnectivityManager.TYPE_WIFI);

        // 如果3G、WIFI、2G等网络状态是连接的，则退出，否则显示提示信息进入网络设置界面
        if (mMobile != null && mMobile.isConnected()) {
            return true;
        }
        if (mWifi != null && mWifi.isConnected()) {
            return true;
        }

        DialogUtil.showTipsMy(context);

        return false;
    }
}

这个类请尽量存一些整个app通用的值,尽量少做操作,因为是整个应用共享,生命周期是最长的,存的太多,释放不了,甚至会OOM哟!!