Intent.getExtras()始终返回null

Question

我正试图通过onCreate我希望"重定向" 的通知和事件来运行活动.为此添加了对Intent课堂信息的思考.一个重要的特性是生成通知的类是通过服务执行的.我从getApplicationContext类提供的方法中检索上下文android.app.Application.每当我调用方法getExtras()返回时null.我究竟做错了什么？

public class OXAppUpdateHandler {

    private void addNotification(Context context, int iconID,
           CharSequence tickerText, CharSequence title, CharSequence content) {

        CharSequence notificationTicket = tickerText;
        CharSequence notificationTitle = title;
        CharSequence notificationContent = content;

        long when = System.currentTimeMillis();

        Intent intent = new Intent(context, MainActivity_.class);
        intent.setFlags(
            Intent.FLAG_ACTIVITY_CLEAR_TOP | Intent.FLAG_ACTIVITY_SINGLE_TOP);
        intent.putExtra(OPEN_UPDATE_ACTIVITY_KEY, 1);

        PendingIntent pendingIntent = 
            PendingIntent.getActivity(context, 0, intent, 0);

        NotificationManager notificationManager = 
            (NotificationManager) context.getSystemService(
                Context.NOTIFICATION_SERVICE);
        Notification notification = 
            new Notification(iconID, notificationTicket, when);
        notification.setLatestEventInfo(context, notificationTitle, 
                                        notificationContent, pendingIntent);
        notificationManager.notify(NOTIFICATION_ID, notification);
    }

    public static boolean isUpdateStart(Intent intent) {
        Bundle bundle = intent.getExtras();
        boolean result = bundle != null && 
                         bundle.containsKey(OPEN_UPDATE_ACTIVITY_KEY);
        if (result) {
            bundle.remove(OPEN_UPDATE_ACTIVITY_KEY);
        }
        return result;
        }
    }

    @EActivity(R.layout.activity_main)
    public class MainActivity extends Activity {
        @Override
        protected void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            if (OXAppUpdateHandler.isUpdateStart(getIntent())) {
                startActivity(new Intent(this, UpdateActivity_.class));
            }
        }
    }

Answer 1

我要靠窗外猜测你的问题在这里:

PendingIntent pendingIntent = PendingIntent.getActivity(context, 0, intent, 0);

您传递intent到getActivity()并期望你会得到一个PendingIntent符合您Intent和您的包括演员.不幸的是,如果PendingIntent系统中已经存在与您匹配的浮动Intent(不考虑您的Intent额外内容),那么getActivity()将返回给您PendingIntent.

要查看这是否是问题,请尝试以下操作:

PendingIntent pendingIntent = PendingIntent.getActivity(context, 0, intent,
                    PendingIntent.FLAG_UPDATE_CURRENT);

这表示如果已经有一个PendingIntent与Intent系统中的某个位置相匹配,那么它应该用intent参数中的附加内容替换附加内容.