android - 如何从android.app.Notification对象检索ContentText？

Question

我正在寻找一种能够从Notification Object检索ContentText的方法。类似于以下内容：

NotificaionCompat.Builder builder;
Notification existing;
builder.setContentText(existing.ContentText);

我已经发现您可以找到并检索代码文本。例如，下面的代码已经做到了：

CharSquence tickertext;
tickertext = existing.tickerText;

请您能帮我弄清楚如何解决我的问题吗？

谢谢，

以撒

Answer 1

最好的方法是使用NotificationListenerService。它是在Android 4.3中引入的，并通过Android 4.4中的许多新功能进行了相当大的改进。您应该使用它。

如何使用

步骤1

首先，您需要扩展NotificationListenerService类并实现其方法。

public class SimpleKitkatNotificationListener extends NotificationListenerService {

        @Override
        public void onNotificationPosted(StatusBarNotification sbn) {
              //..............
        }

        @Override
        public void onNotificationRemoved(StatusBarNotification sbn) {
              //.............. 
        }
}

第2步

然后，您必须使用BIND_NOTIFICATION_LISTENER_SERVICE权限在清单文件中声明该服务，并在SERVICE_INTERFACE操作中包含一个意图过滤器。

<service
      android:name="it.gmariotti.android.examples.
            notificationlistener.SimpleKitkatNotificationListener"
      android:label="@string/service_name"
      android:debuggable="true"
      android:permission="android.permission.BIND_NOTIFICATION_LISTENER_SERVICE" >
      <intent-filter>
           <action android:name="android.service.
                 notification.NotificationListenerService" ></action>
      </intent-filter>

 </service>

第三步

您必须从用户授权。您可以在设置->安全->通知访问中找到它

Intent intent = new Intent("android.settings.ACTION_NOTIFICATION_LISTENER_SETTINGS");
    startActivity(intent);

步骤4

使用extras字段获取您想要的任何信息，

Notification mNotification=sbn.getNotification();
   Bundle extras = mNotification.extras;

您可以从此类中获得很多信息，

/**
     * {@link #extras} key: this is the title of the notification,
     * as supplied to {@link Builder#setContentTitle(CharSequence)}.
     */
    public static final String EXTRA_TITLE = "android.title";

    /**
     * {@link #extras} key: this is the main text payload, as supplied to
     * {@link Builder#setContentText(CharSequence)}.
     */
    public static final String EXTRA_TEXT = "android.text";

    /**
     * {@link #extras} key: this is a third line of text, as supplied to
     * {@link Builder#setSubText(CharSequence)}.
     */
    public static final String EXTRA_SUB_TEXT = "android.subText";

    /**
     * {@link #extras} key: this is a bitmap to be used instead of the small icon when showing the
     * notification payload, as
     * supplied to {@link Builder#setLargeIcon(android.graphics.Bitmap)}.
     */
    public static final String EXTRA_LARGE_ICON = "android.largeIcon";

第5步

您可以轻松获得这样的数据，

String notificationTitle = extras.getString(Notification.EXTRA_TITLE);
     int notificationIcon = extras.getInt(Notification.EXTRA_SMALL_ICON);
     Bitmap notificationLargeIcon = 
                  ((Bitmap) extras.getParcelable(Notification.EXTRA_LARGE_ICON));
     CharSequence notificationText = extras.getCharSequence(Notification.EXTRA_TEXT);
     CharSequence notificationSubText = extras.getCharSequence(Notification.EXTRA_SUB_TEXT);