我创建了一个应用程序，它根据人口密度突出显示美国各州。我只想突出显示用户需要查看的状态。这是使用 RecyclerView 和复选框完成的。
这是我的 MainActivity 的 .xml 文件。
<FrameLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:mapbox="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
tools:context="com.example.aadhilahmed.choroplethmapbox1.MainActivity">
<com.mapbox.mapboxsdk.maps.MapView
android:id="@+id/mapView"
android:layout_width="match_parent"
android:layout_height="match_parent"
mapbox:mapbox_cameraTargetLat="37.996162943943155"
mapbox:mapbox_cameraTargetLng="-101.0299301147461"
mapbox:mapbox_cameraTilt="20"
mapbox:mapbox_cameraZoom="2"
mapbox:mapbox_styleUrl="mapbox://styles/aadhilahmed/cj7ps8l3a8uxs2rocjqnakcrs"/>
<android.support.v7.widget.RecyclerView
android:layout_width="150dp"
android:layout_height="250dp"
android:id="@+id/recyclerView"
android:paddingRight="5dp"
android:paddingBottom="8dp"
android:background="#ffffff"
android:layout_gravity="bottom|right">
</android.support.v7.widget.RecyclerView>
</FrameLayout>
这是我的主要活动。
public class MainActivity extends AppCompatActivity {
private MapView mapView;
String jsonData;
JSONObject jsonObject;
JSONArray jsonArray;
List<List<LatLng>> coordinates=new ArrayList<>();
List<String> colours=new ArrayList<>();
List<String> adapterLegend= Arrays.asList("0-10","10-20","20-50","50-100","100-200","200-500","500-1000","1000-10000");
int[] images={R.drawable.colormap1,
R.drawable.colormap2,
R.drawable.colormap3,
R.drawable.colormap4,
R.drawable.colormap5,
R.drawable.colormap6,
R.drawable.colormap7,
R.drawable.colormap8
};
private RecyclerView recyclerView;
private RecyclerView.Adapter adapter;
private List<ListItem> listItemss;
private List<ListItem> currentCheckedItems=new ArrayList<>();
int[] selectedRangeArray=new int[50];
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
Mapbox.getInstance(this,"pk.eyJ1IjoiYWFkaGlsYWhtZWQiLCJhIjoiY2o2MXNzY3I5MHoyajMybW9raTI1emJmbiJ9.paxtpoOPEQDuVN19tlfpVw");
setContentView(R.layout.activity_main);
mapView=(MapView)findViewById(R.id.mapView);
mapView.onCreate(savedInstanceState);
recyclerView=(RecyclerView)findViewById(R.id.recyclerView);
recyclerView.setHasFixedSize(true);
recyclerView.setLayoutManager(new LinearLayoutManager(this));
listItemss=new ArrayList<>();
for(int i=0;i<8;i++){
ListItem listItem=new ListItem(images[i],adapterLegend.get(i));
listItemss.add(listItem);
}
adapter=new MyAdapter(listItemss,this, new MyAdapter.OnItemCheckListener() {
@Override
public void onItemCheck(ListItem item) {
currentCheckedItems.add(item);
}
@Override
public void onItemUncheck(ListItem item) {
currentCheckedItems.remove(item);
}
});
recyclerView.setAdapter(adapter);
RangeOfCheckedItems range=new RangeOfCheckedItems();
selectedRangeArray=range.limitFinder(currentCheckedItems.size(),currentCheckedItems);
try
{
jsonData= convertJSONFile("stateData.geojson",MainActivity.this);
jsonObject=new JSONObject(jsonData);
jsonArray=jsonObject.getJSONArray("features");
choroplethManipulation();
} catch (IOException e) {
e.printStackTrace();
} catch (JSONException e) {
e.printStackTrace();
}
}
public void drawMap(final List<List<LatLng>> points, final List<String> colur){
mapView.getMapAsync(new OnMapReadyCallback() {
@Override
public void onMapReady(MapboxMap mapboxMap) {
for(int m=0;m< colours.size();m++) {
mapboxMap.addPolygon(new PolygonOptions()
.addAll(points.get(m))
.fillColor(Color.parseColor(colur.get(m)))
);
}
}
});
}
public void choroplethManipulation() throws JSONException {
for(int state=0;state<jsonArray.length();state++) {
boolean checked = false;
//Choose color for the area
float orders = (float) jsonArray.getJSONObject(state).getJSONObject("properties").getDouble("density");
for (int n = 0; n < currentCheckedItems.size(); n++) {
if ((int) orders > selectedRangeArray[n] && (int) orders < selectedRangeArray[n + 1])
checked = true;
}
if (checked == true) {
//Collecting coordinates for drawing polygon
JSONObject geometry = jsonArray.getJSONObject(state).getJSONObject("geometry");
String type = geometry.getString("type");
if (type.equals("Polygon")) {
JSONArray points = geometry.getJSONArray("coordinates").getJSONArray(0);
List<LatLng> polygonpoints = new ArrayList<>();
for (int i = 0; i < points.length(); i++) {
polygonpoints.add(new LatLng(points.getJSONArray(i).getDouble(1), points.getJSONArray(i).getDouble(0)));
}
coordinates.add(polygonpoints);
colours.add(ColorSelector.ColorChooser.chooseColor(orders));
} else {
JSONArray points = geometry.getJSONArray("coordinates");
for (int p = 0; p < points.length(); p++) {
JSONArray splits = points.getJSONArray(p).getJSONArray(0);
List<LatLng> polygonpoints = new ArrayList<>();
for (int x = 0; x < splits.length(); x++) {
polygonpoints.add(new LatLng(splits.getJSONArray(x).getDouble(1), splits.getJSONArray(x).getDouble(0)));
}
coordinates.add(polygonpoints);
colours.add(ColorSelector.ColorChooser.chooseColor(orders));
}
}
}
}
drawMap(coordinates,colours);
}
public String convertJSONFile(String filename, Context context) throws IOException {
AssetManager manager=context.getAssets();
InputStream file=manager.open(filename);
byte[] formArray=new byte[file.available()];
file.read(formArray);
file.close();
return new String(formArray);
}
}
这是一个小类，它给出了选中复选框的上限和下限。
public class RangeOfCheckedItems {
int limits[]=new int[50];
public int[] limitFinder(int num,List<ListItem> checkedItems){
for(int i=0;i<num;i++){
String s=checkedItems.get(i).getRange();
StringTokenizer st=new StringTokenizer(s,"-");
limits[i]=Integer.parseInt(st.nextToken());
limits[i+1]=Integer.parseInt(st.nextToken());
}
return limits;
}
}
这是我的适配器类。
public class MyAdapter extends RecyclerView.Adapter<MyAdapter.ViewHolder> {
interface OnItemCheckListener{
void onItemCheck(ListItem item);
void onItemUncheck(ListItem item);
};
private List<ListItem> listItems;
private Context context;
@NonNull
private OnItemCheckListener onItemCheckListener;
public MyAdapter(List<ListItem> listItems,Context context,@NonNull OnItemCheckListener onItemCheckListener){
this.listItems=listItems;
this.context=context;
this.onItemCheckListener=onItemCheckListener;
}
@Override
public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
View v= LayoutInflater.from(parent.getContext())
.inflate(R.layout.legend_adapter,parent,false);
return new ViewHolder(v);
}
@Override
public void onBindViewHolder(final ViewHolder holder, int position) {
ListItem listItem=listItems.get(position);
holder.image.setImageResource(listItem.getImage());
holder.rangeinfo.setText(listItem.getRange());
if(holder instanceof ViewHolder){
final ListItem currentItem=listItems.get(position);
((ViewHolder)holder).setOnClickListener(new View.OnClickListener(){
@Override
public void onClick(View v) {
((ViewHolder)holder).checkBox.setChecked(!((ViewHolder)holder).checkBox.isChecked());
if(((ViewHolder)holder).checkBox.isChecked()){
onItemCheckListener.onItemCheck(currentItem);
}else {
onItemCheckListener.onItemUncheck(currentItem);
}
}
});
}
}
@Override
public int getItemCount() {
return listItems.size();
}
public class ViewHolder extends RecyclerView.ViewHolder{
public ImageView image;
public TextView rangeinfo;
public CheckBox checkBox;
public ViewHolder(View itemView) {
super(itemView);
image=(ImageView)itemView.findViewById(R.id.colorLegend);
rangeinfo=(TextView)itemView.findViewById(R.id.textLegend);
checkBox=(CheckBox)itemView.findViewById(R.id.checkboxLegend);
checkBox.setClickable(false);
}
public void setOnClickListener(View.OnClickListener onClickListener){
itemView.setOnClickListener(onClickListener);
}
}
}
我的问题是我只想choroplethManipulation()在从复选框获得输入后才调用方法。但是在所有执行之后，我的活动正在膨胀，因此我无法提供我的输入并且checked变量始终保持为假。选中这些框后，我需要我的 Activity 动态做出反应并仅显示选定的结果。如何才能做到这一点？