How to use

valueAt

method

in

com.heaven7.java.base.util.SparseArray

@Override
public V valueAt(int index) {
  return mMap.valueAt(index);
}

@Override
public V valueAt(int index) {
  return mMap.valueAt(index);
}

@Override
public void write(JsonWriter out, SparseArray<T> value) throws IOException {
  out.beginObject();
  if(value != null) {
    for (int size = value.size(), i = size - 1; i >= 0; i--) {
      out.name(value.keyAt(i) + "");
      mAdapter.write(out, value.valueAt(i));
    }
  }
  out.endObject();
}

  static void writeSparseArray0(Parcel in, SparseArray val) {
    if (val == null) {
      in.writeInt(-1);
      return;
    }
    int N = val.size();
    in.writeInt(N);
    int i=0;
    while (i < N) {
      in.writeInt(val.keyAt(i));
      in.writeValue(val.valueAt(i));
      i++;
    }
  }
}

@Override
public void write(JsonWriter out,  GsonProperty property, Object value) throws IOException {
  final Class<?> simpleType = property.getType();
  out.beginObject();
  if(value != null) {
    final SparseArray sa = (SparseArray) value;
    if(simpleType.isPrimitive() || isBoxedClass(simpleType)){
      for (int size = sa.size(), i = size - 1; i >= 0; i--) {
        out.name(sa.keyAt(i) + "");
        writePrimitiveOrItsBox(out, simpleType, sa.valueAt(i));
      }
    }else {
      TypeAdapter adapter = getTypeAdapter(simpleType);
      for (int size = sa.size(), i = size - 1; i >= 0; i--) {
        out.name(sa.keyAt(i) + "");
        adapter.write(out, sa.valueAt(i));
      }
    }
  }
  out.endObject();
}

/**
 * convert the target object to json. currently support simple object, array , list. SparseArray
 * @param t the object. must have annotation {@linkplain JsonAdapter}
 * @return the json string.
 * @see SparseArray
 */
public static String toJson(Object t) {
  GsonBuilder builder = new GsonBuilder()
      .setVersion(GlobalSetting.getDefault().getGsonVersion());
  if(t instanceof SparseArray){
    SparseArray sa = (SparseArray) t;
    if(sa.size() == 0){
      return "{}";
    }
    Class<?> clazz = sa.valueAt(0).getClass();
   /*  builder.registerTypeAdapter(
        TypeToken.getParameterized(SparseArray.class, clazz).getType(),
        new SparseArrayTypeAdapter<>(TypeHandler.getTypeAdapter(clazz)));*/
    builder.registerTypeAdapter(SparseArray.class,
        new SparseArrayTypeAdapter<>(TypeHandler.getTypeAdapter(clazz)));
  }
  return builder.create().toJson(t);
}

@Override
public boolean clearTo(SparseArrayDelegate<V> out) {
  final int size = mMap.size();
  if(size == 0){
    return false;
  }
  if(out != null) {
    for (int i = size -1 ; i>=0 ; i--){
      out.put(mMap.keyAt(i), mMap.valueAt(i), null);
    }
  }
  mMap.clear();
  return true;
}

@Override
public boolean clearTo(SparseArrayDelegate<V> out) {
  final int size = mMap.size();
  if(size == 0){
    return false;
  }
  if(out != null) {
    for (int i = size -1 ; i>=0 ; i--){
      out.put(mMap.keyAt(i), mMap.valueAt(i), null);
    }
  }
  mMap.clear();
  return true;
}

@Override
public void write(JsonWriter out, SparseArray<Car3> value) throws IOException {
  out.beginObject();
  if(value != null) {
    for (int size = value.size(), i = size - 1; i >= 0; i--) {
      out.name(value.keyAt(i) + "");
      mAdapter.write(out, value.valueAt(i));
    }
  }
  out.endObject();
}