android onNewIntent和使用通知时问题

在Android收到通知，点击跳转的时候可能遇到一些问题。

1、onNewIntent()

onNewIntent()介绍:当我们设置activity的启动模式是singleTop的时候，再次启动这个activity就会走onNewIntent()–onResume()这样的流程，而不会再走onCreate()方法

  /**     * This is called for activities that set launchMode to "singleTop" in     * their package, or if a client used the {@link Intent#FLAG_ACTIVITY_SINGLE_TOP}     * flag when calling {@link #startActivity}.  In either case, when the     * activity is re-launched while at the top of the activity stack instead     * of a new instance of the activity being started, onNewIntent() will be     * called on the existing instance with the Intent that was used to     * re-launch it.      *       * <p>An activity will always be paused before receiving a new intent, so      * you can count on {@link #onResume} being called after this method.      *      * <p>Note that {@link #getIntent} still returns the original Intent.  You      * can use {@link #setIntent} to update it to this new Intent.      *      * @param intent The new intent that was started for the activity.      *       * @see #getIntent     * @see #setIntent      * @see #onResume      */    protected void onNewIntent(Intent intent) {    }

2、问题1：当通过Intent跳转的时候从Intent中取出的数据不是我们通过Intent传递的值。

示例：当我们收到通知的时候通过intent携带
intent.putExtra(“data”, “msg”);但在activity中取出来的并不是我们传递的数据。而是老的数据（这个数据是我们以前用过的）；

Intent intent = new Intent(context, MainActivity.class);            intent.putExtra("data", "msg");            PendingIntent pIntent = PendingIntent.getActivity(context, 0,                    intent, PendingIntent.FLAG_CANCEL_CURRENT);            mBuilder.setContentIntent(pIntent);            mNotificationManager.notify(pb.getId(), mBuilder.build());

在activity中

    @Override    protected void onNewIntent(Intent intent) {        super.onNewIntent(intent);        String data =   intent.getStringExtra("data");        System.out.println("notify-----" + data);    }

---

解决办法：
在onNewIntent()中加上setIntent(intent);The new Intent object to return from getIntent（通过设置返回给我们最新的intent）

@Override    protected void onNewIntent(Intent intent) {        super.onNewIntent(intent);        setIntent(intent);        String data = intent.getStringExtra(Constants.DATA);        System.out.println("notify-----" + data);        if (StringUtils.isBlank(data)) {            return;        }        if (data.equals(Constants.DATA_MSG)) {            setRightFragment(new ChatListFragment());        } else {            setRightFragment(new PatientListFragment());        }    }

2、问题1：设置了onNewIntent ()中的setIntent(intent); 仍然没有有取出最新的intent是携带的参数。

我在通知中判断不同的通知类型，产生不同的通知，代码如下，发现传递的产生一直为null，但我在intent中的确携带参数了。

    @TargetApi(Build.VERSION_CODES.JELLY_BEAN)    public void updateNotification(Context context, PushBean pb) {        NotificationManager mNotificationManager = (NotificationManager) context                .getSystemService(Context.NOTIFICATION_SERVICE);        NotificationCompat.Builder mBuilder = new NotificationCompat.Builder(                context);        System.out.println("--------type---" + pb.getType());        if (pb.getType().equals("1")) {            // 血糖推送            mBuilder.setContentTitle("血糖告警")                    .setContentText(pb.getMsg())                    .setTicker("收到血糖告警信息！")                    .setWhen(System.currentTimeMillis())                    .setPriority(Notification.PRIORITY_DEFAULT)                    .setAutoCancel(true)                    .setDefaults(                            Notification.DEFAULT_VIBRATE                                    | Notification.DEFAULT_LIGHTS)                    .setSmallIcon(R.drawable.notification_logo);            if ("-1".equals(pb.getCode())) {                mBuilder.setSound(Uri.parse("android.resource://"                        + context.getPackageName() + "/" + R.raw.low));            } else if ("1".equals(pb.getCode())) {                mBuilder.setSound(Uri.parse("android.resource://"                        + context.getPackageName() + "/" + R.raw.high));            }            Intent intent = new Intent(context, MainActivity.class);            intent.putExtra(Constants.DATA, Constants.DATA_BLOOD);            PendingIntent pIntent = PendingIntent.getActivity(context, 0,                    intent, 0);            mBuilder.setContentIntent(pIntent);            mNotificationManager.notify(pb.getId(), mBuilder.build());        } else {            // 医院互动            mBuilder.setContentTitle("医患互动").setContentText(pb.getMsg())                    .setTicker("收到医患互动信息！").setWhen(System.currentTimeMillis())                    .setPriority(Notification.PRIORITY_DEFAULT)                    .setAutoCancel(true).setDefaults(Notification.DEFAULT_ALL)                    .setSmallIcon(R.drawable.notification_logo);            Intent intent = new Intent(context, MainActivity.class);            intent.putExtra(Constants.DATA, Constants.DATA_MSG);            PendingIntent pIntent = PendingIntent.getActivity(context, 0,                    intent, 0);            mBuilder.setContentIntent(pIntent);            mNotificationManager.notify(pb.getId(), mBuilder.build());        }    }

后来发现问题是在PendingIntent上
当通过getActivity设置时

 public static PendingIntent getActivity(Context context, int requestCode,            Intent intent, int flags) {        return getActivity(context, requestCode, intent, flags, null);    }

第一个参数：上下文

第二个参数：requestCode
当我们使用Flags为PendingIntent.FLAG_UPDATE_CURRENT时如果没有传递requestCode时，那么通知来了，我们点击最后一个会跳转，而点击前面的都不会再跳转了
解决办法：
设置一个 int msgTag,在每次消息来的时候msgTag++;把这个值给requestCode这样值 不同，多个通知也都能响应点击事件了。

第三个参数：intent;

第四个参数：标记 FLAG_CANCEL_CURRENT 和FLAG_UPDATE_CURRENT

/**     * Flag for use with {@link #getActivity}, {@link #getBroadcast}, and     * {@link #getService}: if the described PendingIntent already exists,     * the current one is canceled before generating a new one.  You can use     * this to retrieve a new PendingIntent when you are only changing the     * extra data in the Intent; by canceling the previous pending intent,     * this ensures that only entities given the new data will be able to     * launch it.  If this assurance is not an issue, consider     * {@link #FLAG_UPDATE_CURRENT}.     */    public static final int FLAG_CANCEL_CURRENT = 1<<28;

---

  /**     * Flag for use with {@link #getActivity}, {@link #getBroadcast}, and     * {@link #getService}: if the described PendingIntent already exists,     * then keep it but its replace its extra data with what is in this new     * Intent.  This can be used if you are creating intents where only the     * extras change, and don't care that any entities that received your     * previous PendingIntent will be able to launch it with your new     * extras even if they are not explicitly given to it.     */    public static final int FLAG_UPDATE_CURRENT = 1<<27;

Flags为PendingIntent.FLAG_CANCEL_CURRENT，则只有最后一次PendingIntent有效，之前的都无效了。（只有点击最后一有个通知才会效，点击以前人都不会跳转）
Flags为PendingIntent.FLAG_UPDATE_CURRENT，对于FLAG_UPDATE_CURRENT,如果上面的num为常量， 则所有对应的Intent里面的extra被更新为最新的， 就是全部为最后一次的。
相反，如果requestCode每次不一样，则里面的Inent的数据没被更新（也就是说，如果每个requestCode不一样时，我们点击不同的通知才会做出跳转）。

正确的代码如下：

public class NotificationReceiver extends BroadcastReceiver {    private int msgTag = 0;    NotificationManager mNotificationManager;    @Override    public void onReceive(Context context, Intent intent) {        if (Constants.ACTION_PUSH.equals(intent.getAction())) {            String msg = intent.getExtras().getString("contacts");            System.out.println("收到通知------");            LogUtils.i("pushStatus", "收到的广播：" + msg);            if (StringUtils.isNotBlank(msg)) {                String[] result = msg.split(";/");                Gson gson = new Gson();                PushBean pb = gson.fromJson(result[2], PushBean.class);                if (StringUtils.isNotBlank(result[0])) {                    pb.setId(Integer.parseInt(result[0]));                }                updateNotification(context, pb);            }        }    }    @TargetApi(Build.VERSION_CODES.JELLY_BEAN)    public void updateNotification(Context context, PushBean pb) {        msgTag++;        NotificationManager mNotificationManager = (NotificationManager) context                .getSystemService(Context.NOTIFICATION_SERVICE);        NotificationCompat.Builder mBuilder = new NotificationCompat.Builder(                context);        System.out.println("--------type---" + pb.getType());        System.out.println("收到通知时msgTag=====" + msgTag);        if (pb.getType().equals("1")) {            // 血糖推送            mBuilder.setContentTitle("收到一个血糖通知")                    .setContentText(pb.getMsg())                    .setTicker("收到血糖告警信息！")                    .setWhen(System.currentTimeMillis())                    .setPriority(Notification.PRIORITY_DEFAULT)                    .setAutoCancel(true)                    .setDefaults(                            Notification.DEFAULT_VIBRATE                                    | Notification.DEFAULT_LIGHTS)                    .setSmallIcon(R.drawable.notification_logo);            if ("-1".equals(pb.getCode())) {                mBuilder.setSound(Uri.parse("android.resource://"                        + context.getPackageName() + "/" + R.raw.low));            } else if ("1".equals(pb.getCode())) {                mBuilder.setSound(Uri.parse("android.resource://"                        + context.getPackageName() + "/" + R.raw.high));            }            Intent intent = new Intent(context, MainActivity.class);            intent.putExtra(Constants.DATA, Constants.DATA_BLOOD);            PendingIntent pIntent = PendingIntent.getActivity(context, msgTag,                    intent, PendingIntent.FLAG_UPDATE_CURRENT);            mBuilder.setContentIntent(pIntent);            mNotificationManager.notify(pb.getId(), mBuilder.build());        } else {            // 医院互动            mBuilder.setContentTitle("医患互动").setContentText(pb.getMsg())                    .setTicker("收到医患互动信息！").setWhen(System.currentTimeMillis())                    .setPriority(Notification.PRIORITY_DEFAULT)                    .setAutoCancel(true).setDefaults(Notification.DEFAULT_ALL)                    .setSmallIcon(R.drawable.notification_logo);            Intent intent = new Intent(context, MainActivity.class);            intent.putExtra(Constants.DATA, Constants.DATA_MSG);            PendingIntent pIntent = PendingIntent.getActivity(context, msgTag,                    intent, PendingIntent.FLAG_UPDATE_CURRENT);            mBuilder.setContentIntent(pIntent);            mNotificationManager.notify(pb.getId(), mBuilder.build());        }    }}