Java 未在Arraylist中添加项
这就是我试图将“ID”从api添加到arraylist的方式Java 未在Arraylist中添加项,java,android,api,android-intent,arraylist,Java,Android,Api,Android Intent,Arraylist,这就是我试图将“ID”从api添加到arraylist的方式 int id; private List<HashMap<String, Object>> getMovies(JSONArray jMovies) throws NullPointerException { int movieCount = jMovies.length(); List<HashMap<String, Object>>
int id;
private List<HashMap<String, Object>>
getMovies(JSONArray jMovies) throws NullPointerException {
int movieCount = jMovies.length();
List<HashMap<String, Object>> movieList = new ArrayList<HashMap<String, Object>>();
HashMap<String, Object> movie = null;
//Taking each movie, parses and adds to list object
for (int i = 0; i < movieCount; i++) {
try {
JSONObject getid=(JSONObject) jMovies.get(i);
movie = getMovie(getid);
movieList.add(movie);
id =Integer.parseInt(getid.getString("id"));
} catch (JSONException e) {
}
getNumberlist(i,id);
}
return movieList;
}
public ArrayList<Integer> ids=new ArrayList<Integer>();
public void getNumberlist(int i,int id)
{
ids.add(i,id);
}
public List<Integer> getNumberslist()
{ return this.ids;
}
int-id;
私人名单
getMovies(JSONArray jMovies)抛出NullPointerException{
int movieCount=jMovies.length();
List movieList=new ArrayList();
HashMap movie=null;
//拍摄每部电影,解析并添加到列表对象
for(int i=0;i
并尝试在Itemclick listener上获取它
MovieJSONParser mj = new MovieJSONParser();
public void onItemClick(AdapterView<?> l, View v, int position, long id) {
Intent intent = new Intent(this,next.class);
if(position==0) {
int id1 = mj.getNumberslist().get(0);
intent.putExtra("id",id1);
startActivity(intent);
}
if(position==1) {
int id1 = mj.getNumberslist().get(1);
intent.putExtra("id",id1);
startActivity(intent);
}
if(position==2) {
int id1 = mj.getNumberslist().get(2);
intent.putExtra("id",id1);
startActivity(intent);
}
if(position==3) {
int id1 = mj.getNumberslist().get(3);
intent.putExtra("id",id1);
startActivity(intent);
}
}
MovieJSONParser mj=new MovieJSONParser();
公共虚线单击(适配器视图l、视图v、内部位置、长id){
Intent Intent=新Intent(this,next.class);
如果(位置==0){
int id1=mj.getNumberList().get(0);
意向。额外(“id”,id1);
星触觉(意向);
}
如果(位置==1){
int id1=mj.getNumberslist().get(1);
意向。额外(“id”,id1);
星触觉(意向);
}
如果(位置==2){
int id1=mj.getNumberslist().get(2);
意向。额外(“id”,id1);
星触觉(意向);
}
如果(位置==3){
int id1=mj.getNumberslist().get(3);
意向。额外(“id”,id1);
星触觉(意向);
}
}
首先,如果要捕获异常,至少要打印堆栈跟踪,以便更容易调试代码
在使用jMovies.get(i)获取JSONObject时,api数据为空,因此您将获得索引超出绑定异常
for (int i = 0; i < movieCount; i++) {
try {
JSONObject getid=(JSONObject) jMovies.get(i);
movie = getMovie(getid);
movieList.add(movie);
id =Integer.parseInt(getid.getString("id"));
} catch (JSONException e) {
e.printStackTrace();
}
getNumberlist(i,id);
}
for(int i=0;i
检查您是否在jMovies中获取数据。永远不要默默地吞下异常
catch(JSONException e){}
@ScaryWombat我收到了错误:异常:java.lang.IndexOutOfBoundsException:Index:0,Size:0帮助我解决这个问题。我认为问题在于您忽略了异常。catch(JSONException e){}
请在这里发布完整的stacktrace。是的,我在jMovies中获得的数据与在getMovie(getid)中传递时一样该列表中的对象将使用数据更新并返回。如果jMovies不为空,您将获得数据。但是,由于您添加了获取异常的注释:java.lang.IndexOutOfBoundsException:Index:0,Size:0,只有当jMovies为空并且您尝试使用jMovies.get(i)获取第0个索引处的数据时,才会发生这种情况。尝试记录jMovies.get(i)的值,也尝试记录jMovies.length的值。