删除android中的标记

Question

我有一个全局数组对象Marker marker_array[];,稍后在布局中单击我将其初始化为marker_array = new Marker[8];.我想添加标记以在该布局上进行映射,并在第二次单击时删除,因此我创建clickcount了零值的全局变量.

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));


                    }
                }

问题是它创建了所有8个标记但是没有删除,即使在我试图删除标记的情况下Toast显示正确的长度8.当我删除任何单独的删除它时,对接.marker_arraymarker_array[7]

如何在没有方法的情况下删除marker_array中的所有标记,map.clear();因为我还有其他一些我不想删除的折线等内容.

任何努力将不胜感激.

Answer 1

用它来添加标记

作为全球

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

并在你的for循环中添加标记到这个列表

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
}

并删除标记

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

    }

希望它会有所帮助.