Java 如何使用SwipeRefreshLayout在RecyclerView中更新json数据
我是android开发的新手。我正在学习。我能够使用Recyclerview在listview中获取json数据。现在我想包括swiperRefreshLayout,以便在刷新时也显示服务器中的任何更新。我在json中搜索关于swiperRefreshLayout的教程,但这不起作用。我试着使用DefaultHttpClient,但我没能理解这个想法Java 如何使用SwipeRefreshLayout在RecyclerView中更新json数据,java,android,json,android-recyclerview,swiperefreshlayout,Java,Android,Json,Android Recyclerview,Swiperefreshlayout,我是android开发的新手。我正在学习。我能够使用Recyclerview在listview中获取json数据。现在我想包括swiperRefreshLayout,以便在刷新时也显示服务器中的任何更新。我在json中搜索关于swiperRefreshLayout的教程,但这不起作用。我试着使用DefaultHttpClient,但我没能理解这个想法 protected void onCreate (Bundle savedInstanceState){ super.onCrea
protected void onCreate (Bundle savedInstanceState){
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_health);
mRecyclerView = findViewById(R.id.recycler_view);
LinearLayoutManager linearLayoutManager = new LinearLayoutManager(this);
mRecyclerView.setHasFixedSize(true);
mRecyclerView.setLayoutManager(new LinearLayoutManager(this));
mSwipeRefreshLayout = (SwipeRefreshLayout) findViewById(R.id.swipeRefreshLayout);
mSwipeRefreshLayout.setOnRefreshListener(new SwipeRefreshLayout.OnRefreshListener() {
@Override
public void onRefresh() {
}
});
mExampleList = new ArrayList<>();
mRequestQueue = Volley.newRequestQueue(this);
parseJSON();
}
private void parseJSON() {
String url = "http://fitandfineindustries.com/healthapi.php";
JsonObjectRequest request = new JsonObjectRequest(Request.Method.GET, url, null,
new Response.Listener<JSONObject>() {
@Override
public void onResponse(JSONObject response) {
try {
JSONArray jsonArray = response.getJSONArray("info");
for (int i = 0; i < jsonArray.length(); i++) {
JSONObject hit = jsonArray.getJSONObject(i);
String creatorName = hit.getString("heading");
String img = hit.getString("img");
String imageUrl = img.length() == 0 ? "file:///android_asset/fitandfineindustries.jpg" : "http://fitandfineindustries.com/images/plan/"+img;
mExampleList.add(new NewsItem(imageUrl, creatorName));
}
mNewsAdapter = new NewsAdapter(HealthActivity.this, mExampleList);
mRecyclerView.setAdapter(mNewsAdapter);
mNewsAdapter.setOnItemClickListener(HealthActivity.this);
} catch (JSONException e) {
e.printStackTrace();
}
}
}, new Response.ErrorListener() {
@Override
public void onErrorResponse(VolleyError error) {
error.printStackTrace();
}
});
mRequestQueue.add(request);
}
创建时受保护的void(Bundle savedInstanceState){
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_health);
mRecyclerView=findviewbyd(R.id.recycler\u视图);
LinearLayoutManager LinearLayoutManager=新的LinearLayoutManager(此);
mRecyclerView.setHasFixedSize(true);
mRecyclerView.setLayoutManager(新的LinearLayoutManager(this));
mSwipeRefreshLayout=(SwipeRefreshLayout)findViewById(R.id.SwipeRefreshLayout);
mSwipeRefreshLayout.setOnRefreshListener(新的SwipeRefreshLayout.OnRefreshListener()){
@凌驾
公共void onRefresh(){
}
});
mExampleList=newArrayList();
mRequestQueue=Volley.newRequestQueue(this);
parseJSON();
}
私有void parseJSON(){
字符串url=”http://fitandfineindustries.com/healthapi.php";
JsonObjectRequest=新的JsonObjectRequest(request.Method.GET,url,null,
新的Response.Listener(){
@凌驾
公共void onResponse(JSONObject响应){
试一试{
JSONArray JSONArray=response.getJSONArray(“info”);
for(int i=0;i
SwipeLayout与服务器无关(网络呼叫)。当用户拉动刷新SwiperFreshLayout.OnRefreshListener的onRefresh()时,将调用。就这样,这就是SwipeRefreshLayout的全部功能
这可能对你有帮助-
mSwipeRefreshLayout.setOnRefreshListener(new SwipeRefreshLayout.OnRefreshListener() {
@Override
public void onRefresh() {
//call the parseJSON() function here like this.
parseJSON();
// call the setRefreshing(true) function to show
// the circular rotating refresh icon
mSwipeRefreshLayout.setRefreshing(true);
}
});
//Don't forget to hide the refreshing icon when your server call ends like this.
//mSwipeRefreshLayout.setRefreshing(false);
在刷新调用parseJSON()时,确保在此之前需要清除数组
SwipeRefreshLayout.OnRefreshListener() {
@Override
public void onRefresh() {
mExampleList.clear()
parseJSON();
}
});
mExampleList = new ArrayList<>();
mRequestQueue = Volley.newRequestQueue(this);
parseJSON();
}
SwipeRefreshLayout.OnRefreshListener(){
@凌驾
公共void onRefresh(){
mExampleList.clear()
parseJSON();
}
});
mExampleList=newArrayList();
mRequestQueue=Volley.newRequestQueue(this);
parseJSON();
}
onRefresh()
为空。调用pareJSON()
内的onRefresh()
方法,如果RecyclerView
适配器初始化一次,然后只更新parseJSON()内的列表就更好了,谢谢,但它不起作用,每个刷新事件上的每个列表项都是重复的。