小编Ank*_*hah的帖子

我用于传递意图的 Firebasemessagingservice 类代码：

private void showNotification(String message){
    Intent intent=new Intent(this, DrawerActivity.class);
    intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
    intent.putExtra("data", message);
    PendingIntent pendingIntent=PendingIntent.getActivity(this,0,intent,PendingIntent.FLAG_UPDATE_CURRENT);

    NotificationCompat.Builder builder=new NotificationCompat.Builder(this)
            .setAutoCancel(true)
            .setContentTitle("Registry")
            .setContentText(message)
            .setSmallIcon(R.drawable.com_facebook_button_send_icon_blue)
            .setContentIntent(pendingIntent);
    NotificationManager manager=(NotificationManager) getSystemService(NOTIFICATION_SERVICE);
    manager.notify(0,builder.build());
}

我在 onCreate() 方法中的 Fragment BaseActivity 代码：

Intent notifyIntent = getIntent();
    Bundle extras = notifyIntent.getExtras();
    if (extras != null) {

       replacefragment code;

    }

它不工作..

为什么在运行应用程序时总是会出现NullPointerException？每次我启动我的genymotion模拟器,然后第一次运行应用程序,它崩溃,但第二次我运行我的应用程序工作顺利.我不知道为什么它会在第一次运行时发生.

这是我的Splash屏幕,它从RetrieveGamesBGTask中检索JSON对象:

public class Splash extends Activity {
     RetrieveGamesBGTask retrieveGamesBGTask;
    String json_string;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.splash);

        Thread thread = new Thread(){
            @Override
            public void run() {
                try {
                    retrieveGamesBGTask = new RetrieveGamesBGTask();
                    retrieveGamesBGTask.execute();
                    sleep(3000);
                    Intent intent = new Intent(getApplication(), Games.class);
                    intent.putExtra("json_data", json_string);
                    intent.putExtra("json_data", retrieveGamesBGTask.getResult());
                    startActivity(intent);
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }
            }
        };
        thread.start();

这是下一个应用程序,它在第一次运行时每次崩溃:

 retrieveGamesBGTask = new RetrieveGamesBGTask();
        retrieveGamesBGTask.execute();

  Intent intent = this.getIntent();

        if (intent != null) {
            json_string = intent.getStringExtra("json_data");
        }


        try { …

错误:(1,0)android gradle插件版本2.3.0-alpha1太旧了,请更新到最新版本.

要从命令行覆盖此检查,请将ANDROID_DAILY_OVERRIDE环境变量设置为"7e7deaebeebf38c3d877c687336265b8c39674f5"

知道我应该使用什么Gradle插件版本？我在金丝雀频道使用Android Studio 2.3 Beta 1.

我有以下问题.我需要验证日期和时间,因此如果星期几是星期二或星期四,并且时间是2:00到3:00 PM ,则返回false .

我有两个选择:

if (appointmentRequest.getDateTime().getDayOfWeek() == DayOfWeek.TUESDAY
                || appointmentRequest.getDateTime().getDayOfWeek() == DayOfWeek.THURSDAY) {
            if (appointmentRequest.getDateTime().getHour() == 2) {
                return false;
            }
        }

选项2:

if ((appointmentRequest.getDateTime().getDayOfWeek() == DayOfWeek.TUESDAY
                || appointmentRequest.getDateTime().getDayOfWeek() == DayOfWeek.THURSDAY)
                && (appointmentRequest.getDateTime().getHour() == 2)) {
            return false;
        }

在这种情况下,最佳做法是什么？