Question

在我的项目中，我使用ArcGIS Runtime for Android中的import paramiko import sys import time HOST = "10.11.214.143" USER = "admin" PASS = "passwd" client1=paramiko.SSHClient() client1.set_missing_host_key_policy(paramiko.AutoAddPolicy()) client1.connect(HOST,username=USER,password=PASS) print "SSH connection to %s established" %HOST #copying config to tftp stdin, stdout, stderr = client1.exec_command('copy nvram:startup-config tftp: 10.11.214.144') print stdout.read() Traceback (most recent call last): File "<pyshell#12>", line 1, in <module> client1.exec_command('copy nvram:startup-config tftp:') File "C:\Python27\lib\site-packages\paramiko\client.py", line 436, in exec_command chan = self._transport.open_session(timeout=timeout) File "C:\Python27\lib\site-packages\paramiko\transport.py", line 716, in open_session timeout=timeout) File "C:\Python27\lib\site-packages\paramiko\transport.py", line 800, in open_channel raise SSHException('SSH session not active') SSHException: SSH session not active。我对多边形内的要素执行查询并使用某个属性值。搜索完成后，我想清除地图上的所有现有图形。我试过了MapView，但它清除了我的所有图层！如何清除所有图形而不是删除所有图层？

这是我的代码：

map.removeAll()

Answer 1

MapView.removeAll() 从地图中删除所有图层。那不是你想要的。

相反，尝试循环遍历MapView的图层以及GraphicsLayer类型的每个图层（但不是类型ArcGISFeatureLayer），要么删除图层，要么删除图形层。做这样的事情：

private void somewhereInYourExistingCode() {
    ...
    for (Layer layer : map.getLayers()) {
        clearGraphics(layer);
    }
    ...
}

private void clearGraphics(Layer layer) {
    /**
     * ArcGISFeatureLayer extends GraphicsLayer, but what you're
     * probably looking for is GraphicsLayer objects that are
     * not of type ArcGISFeatureLayer.
     */
    if (layer instanceof GraphicsLayer && !(layer instanceof ArcGISFeatureLayer)) {
        // You can call map.removeLayer(layer), or...
        ((GraphicsLayer) layer).removeAll();
    } else if (layer instanceof GroupLayer) {
        GroupLayer groupLayer = (GroupLayer) layer;
        for (Layer sublayer : groupLayer.getLayers()) {
            // Recursive call
            clearGraphics(sublayer);
        }
    }
}

在ArcGIS Runtime for Android中清除MapView图层

1 个答案: