<分区>
int i = 0; //used for getting item position
for (Iterator<CustomObject> iterator = mAdapter.getItemsData().iterator(); iterator.hasNext();) {
if (mAdapter.getItemsData().get(i).getPriceTier() != 1) { //if statement throws error
// Remove the current element from the iterator and the list.
iterator.remove();
mAdapter.removeFromItemsData(i);
}
i++;
}
使用 this stackoverflow 的回答，我遍历了 CustomObject 的数组列表。自定义对象只是一个带有 setter 和 getter 的 POJO 类。 setter 和 getter 具有不同的数据类型，例如 int、String、double 等。
mAdapter.getItemsData 从适配器类返回数组。
//method just notifies the RecyclerView that an item was removed.
public void removeFromItemsData(int position){
notifyItemRemoved(position);
}
这里是异常(exception)
java.lang.IndexOutOfBoundsException: Invalid index 18, size is 18 at java.util.ArrayList.throwIndexOutOfBoundsException(ArrayList.java:255) at java.util.ArrayList.get(ArrayList.java:308) at com.test.TestActivity$5.onClick(TestActivity.java:280) at android.view.View.performClick(View.java:4780) at android.view.View$PerformClick.run(View.java:19866) at android.os.Handler.handleCallback(Handler.java:739) at android.os.Handler.dispatchMessage(Handler.java:95) at android.os.Looper.loop(Looper.java:135) at android.app.ActivityThread.main(ActivityThread.java:5254) at java.lang.reflect.Method.invoke(Native Method) at java.lang.reflect.Method.invoke(Method.java:372) at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:903) at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:698)
自定义对象类
public class CustomObject{
private String name;
private int distance;
private String category;
private String id;
private double rating;
private String ratingColor;
private String prefix;
private String suffix;
private int priceTier;
private String currency;
private String phone;
private String twitter;
private String url;
private String menu;
String address;
String city;
String state;
String postalCode;
double lat;
double lng;
String review;
int reviewCount;
String firstName;
String lastName;
String userIconPrefix;
String userIconSuffix;
String secondsReview;
public CustomObject() {
this.name = "";
this.distance = 0;
this.setCategory("");
this.id = "";
this.rating = 0;
this.ratingColor = "";
this.prefix = "";
this.suffix = "";
this.priceTier = 0;
this.currency = "";
this.phone = "";
this.twitter = "";
this.url = "";
this.menu = "";
this.address = "";
this.city = "";
this.state = "";
this.postalCode = "";
this.lat = 0;
this.lng = 0;
this.review = "";
this.reviewCount = 0;
this.firstName = "";
this.lastName = "";
this.userIconPrefix = "";
this.userIconSuffix = "";
this.secondsReview = "";
}
public void setSecondsReview(String secondsReview){
this.secondsReview = secondsReview;
}
public String getSecondsReview(){
return secondsReview;
}
public void setUserIconSuffix(String userIconSuffix){
this.userIconSuffix = userIconSuffix;
}
public String getUserIconSuffix(){
return userIconSuffix;
}
public void setUserIconPrefix(String userIconPrefix){
this.userIconPrefix = userIconPrefix;
}
public String getUserIconPrefix(){
return userIconPrefix;
}
public void setFirstName(String firstName){
this.firstName = firstName;
}
public String getFirstName(){
return firstName;
//todo if String firstNAme == null, then return "a foursquare user"
}
public void setLastName(String lastName){
this.lastName = lastName;
}
public String getLastName(){
return lastName;
}
public void setReviewCount(int reviewCount){
this.reviewCount = reviewCount;
}
public int getReviewCount(){
return reviewCount;
}
public void setReview(String review){
this.review = review;
}
public String getReview(){
return review;
}
public void setLng(double lng){
this.lng = lng;
}
public double getLng(){
return lng;
}
public void setLat(double lat){
this.lat = lat;
}
public double getLat(){
return lat;
}
public void setPostalCode(String postalCode){
this.postalCode = postalCode;
}
public String getPostalCode(){
return postalCode;
}
public void setState(String state){
this.state = state;
}
public String getState(){
return state;
}
public void setCity(String city){
this.city = city;
}
public String getCity(){
return city;
}
public void setAddress(String address){
this.address = address;
}
public String getAddress(){
return address;
}
public void setMenuUrl(String menu){
this.menu = menu;
}
public String getMenuUrl(){
return menu;
}
public void setUrl(String url){
this.url = url;
}
public String getUrl(){
return url;
}
public void setTwitter(String twitter){
this.twitter = twitter;
}
public String getTwitter(){
return twitter;
}
public void setPhone(String phone){
this.phone = phone;
}
public String getPhone(){
return phone;
}
public String getCurrency(){
return currency;
}
public void setCurrency(String currency){
this.currency = currency;
}
public int getPriceTier(){
return priceTier;
}
public void setPriceTier(int priceTier){
this.priceTier = priceTier;
}
public String getSuffix(){
return suffix;
}
public void setSuffix(String suffix){
this.suffix = suffix;
}
public String getPrefix(){
return prefix;
}
public void setPrefix(String prefix){
this.prefix = prefix;
}
public double getRating(){
if(rating > 0){
return rating;
}
return 0; //TODO display symbol if rating not found
}
public void setRating(double rating){
this.rating = rating;
}
public Integer getDistance() {
if (distance >= 0) {
return distance;
}
return 0; //TODO display symbol if distance not found, like N/A
}
public void setDistance(int distance) {
this.distance = distance;
}
public void setName(String name) {
this.name = name;
}
public String getName() {
return name;
}
public String getCategory() {
return category;
}
public void setCategory(String category) {
this.category = category;
}
public void setId(String id) {
this.id = id;
}
public String getId() {
return id;
}
}
数据是如何添加的
在activity的onCreate中，我实例化了Recyclerview。 RecyclerView 采用一个数组列表，因此我传递了一个空数组。
List listTitle = new ArrayList(); //empty arraylist
mAdapter = new Fragment1Adapter(listTitle);
RecyclerView mRecyclerView = (RecyclerView) findViewById(R.id.recyclerView);
mRecyclerView.setHasFixedSize(true);
mRecyclerView.setItemAnimator(new DefaultItemAnimator());
mRecyclerView.setLayoutManager(new LinearLayoutManager(this));
mRecyclerView.setAdapter(mAdapter);
稍后在 AsyncTask 中，我将项目添加到适配器。
for (int i = 0; i < jsonArray.length(); i++) {
CustomObject poi = new CustomObject ();
if (jsonArray.getJSONObject(i).has("venue")) {
poi.setName(jsonArray.getJSONObject(i).getJSONObject("venue").getString("name"));
poi.setId(jsonArray.getJSONObject(i).getJSONObject("venue").getString("id"));
}
mAdapter.addItem(poi);
}
这是addItem类
在适配器类顶部声明 private final List<FoursquareVenue> itemsData;
public void addItem(FoursquareVenue data) {
itemsData.add(data);
notifyItemInserted(itemsData.size() - 1);
}