在android中删除标记 [英] Removing Markers in android

问题描述

我有一个全局数组对象，像 Marker marker_array []; ，后来在布局中点击我初始化为 marker_array = new Marker [8] ; 。我想添加标记来映射该布局，并在第二次点击时删除，因此我创建了 clickcount 具有零值的全局变量。

I have a Global array Object like Marker marker_array[]; and later in Layout click I initialized it as marker_array = new Marker[8];. I want to add markers to map on that layout and remove on 2nd click so I created clickcount Global variable with zero value.

我的正确代码在这里

final RelativeLayout layout = (RelativeLayout) findViewById(R.id.track_div);

        layout.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {

                clickcount++;

                 point_new = new LatLng[8];
                point_new[0] = new LatLng(31.5301843, 74.3207487);
                point_new[1] = new LatLng(31.5214693,74.3236027);
                point_new[2] = new LatLng(31.5194393, 74.3257327);
                point_new[3] = new LatLng(31.4942166, 74.3004533);
                point_new[4] = new LatLng(31.4864646, 74.2911203);
                point_new[5] = new LatLng(31.4803596, 74.2787933);
                point_new[6] = new LatLng(31.4764716, 74.2638203);
                point_new[7] = new LatLng(31.4775236, 74.2628873);

//  initialize marker_array;
                marker_array = new Marker[8];

                Toast.makeText(getApplicationContext(), "count "+clickcount, Toast.LENGTH_SHORT).show();
//
                if (clickcount % 2 == 0) {
                    polyline.setVisible(false);


                    for (int i = 0; i < point_new.length; i++){

                        Toast.makeText(getApplicationContext(), "marker length ="+marker_array.length, Toast.LENGTH_SHORT).show();

                        marker_array[i].remove();

//                     marker_array.setVisible(false);

                    }
                } else {
                    polyline.setVisible(true);

 for (int i = 0; i < point_new.length; i++) {
                     //   marker_array = new Marker[point_new.length];
                    MarkerOptions markerOptions = new MarkerOptions()
                            .position(point_new[i]);

                         marker_array[i] = mMap.addMarker(markerOptions);
                        marker_array[i].setTitle("Points");
                    marker_array[i].setSnippet("Distance = 9.6 km, Time = 20 minute/s");
                    marker_array[i].setIcon(BitmapDescriptorFactory.fromResource(R.drawable.bus));


                    }
                }

问题是它创建所有8个标记但不删除，即使在如果条件，我试图删除标记吐司显示适当的长度 8 。当我将任何 marker_array 分别作为 marker_array [7] 删除时， Butt 。

The problem is that it creates all 8 markers But does not remove, Even if in if condition where I'm trying to remove markers Toast shows proper length 8. Butt when I remove any of the marker_array separately as marker_array[7] it removes it.

如何在 marker_array 中删除 map.clear（）; 方法，因为我还有其他一些东西，例如折线等，我不想删除。

How can I remove all the markers in marker_array without map.clear(); method because I have some other things like polyline etc that I do not want to remove.

任何努力将不胜感激。

Any effort will be appreciated.

推荐答案

使用此功能添加标记

As Global

As Global

List<Marker> mMarkers = new ArrayList<Marker>();

并在您的for循环中将标记添加到此列表中，如

And In your for loop add markers to this list like

for (int i = 0; i < point_new.length; i++) {

                        MarkerOptions markerOptions = new MarkerOptions();

                            markerOptions.position(point_new[i]);

                        Marker marker = mMap.addMarker(markerOptions);
                               marker.setTitle("Point");
                        marker.setSnippet("this is snippet");
                        marker.setIcon(BitmapDescriptorFactory.fromResource(R.drawable.p));

                        mMarkers.add(marker); // <-- Like this
}

和删除标记

And to remove markers

private void removeMarkers() {
        for (Marker marker: mMarkers) {
            marker.remove();
        }
        mMarkers.clear();

    }

希望它能帮上忙。

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