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對象後，將其存儲
我試圖解析Json類似如下：如何解析的Android的JSONObject與JsonArray存儲裏面RecyclerView
{
"status": "ok",
"feed": {
"title": "title1",
"link": "http://www.link/",
"author": "",
"description": "desc",
"image": ""
},
"items": [
{
"title": "something",
"link": "something",
"guid": "something",
"pubDate": "date",
"categories": [],
"author": "",
"thumbnail": "",
"description": null,
"content": null
},
...
...
而且我從response得到預期的結果，但是，這是不是point.Here是我做過什麼：
try {
JSONObject response = new JSONObject(result);
JSONObject feed_object = response.getJSONObject("feed");
PostItems item = new PostItems();
item.setAuthor(feed_object.getString("title"));
JSONArray items_arr = response.getJSONArray("items");
for (int i = 0; i < items_arr.length(); i++) {
JSONObject post = items_arr.getJSONObject(i);
item.setTitle(post.getString("title"));
item.setDate(post.getString("pubDate")); // As expected results
feedItem.add(item);
}
}
的一點是，如果我存儲（第一object）像我這樣做如上面的代碼，RecyclerView顯示的項目，但沒有在項目內設置正確的title和date。
如果我將其存儲在陣列內部和在此之後，設置一個陣列（對於array）內部和array外，它只是表示這樣的錯誤：
java.lang.NullPointerException: Attempt to invoke virtual method 'int java.lang.String.length()' on a null object reference
at java.io.StringReader.<init>(StringReader.java:47)
at android.text.HtmlToSpannedConverter.convert(Html.java:449)
at android.text.Html.fromHtml(Html.java:136)
at android.text.Html.fromHtml(Html.java:99)
at client.com.news.RecyclerViews.MainSanjeshRecyclerView.MyRecyclerAdapter.onBindViewHolder(MyRecyclerAdapter.java:34)
at client.com.news.RecyclerViews.MainSanjeshRecyclerView.MyRecyclerAdapter.onBindViewHolder(MyRecyclerAdapter.java:14)
at android.support.v7.widget.RecyclerView$Adapter.onBindViewHolder(RecyclerView.java:5465)
at android.support.v7.widget.RecyclerView$Adapter.bindViewHolder(RecyclerView.java:5498)
at android.support.v7.widget.RecyclerView$Recycler.getViewForPosition(RecyclerView.java:4735)
at android.support.v7.widget.RecyclerView$Recycler.getViewForPosition(RecyclerView.java:4611)
at android.support.v7.widget.LinearLayoutManager$LayoutState.next(LinearLayoutManager.java:1988)
at android.support.v7.widget.LinearLayoutManager.layoutChunk(LinearLayoutManager.java:1384)
at android.support.v7.widget.LinearLayoutManager.fill(LinearLayoutManager.java:1347)
at android.support.v7.widget.LinearLayoutManager.onLayoutChildren(LinearLayoutManager.java:574)
at android.support.v7.widget.RecyclerView.dispatchLayoutStep2(RecyclerView.java:3026)
at android.support.v7.widget.RecyclerView.dispatchLayout(RecyclerView.java:2903)
at android.support.v7.widget.RecyclerView.onLayout(RecyclerView.java:3277)
at android.view.View.layout(View.java:16630)
at android.view.ViewGroup.layout(ViewGroup.java:5437)
at android.support.v4.widget.SwipeRefreshLayout.onLayout(SwipeRefreshLayout.java:596)
at android.view.View.layout(View.java:16630)
at android.view.ViewGroup.layout(ViewGroup.java:5437)
at android.support.v4.view.ViewPager.onLayout(ViewPager.java:1684)
at android.view.View.layout(View.java:16630)
at android.view.ViewGroup.layout(ViewGroup.java:5437)
at android.support.design.widget.HeaderScrollingViewBehavior.layoutChild(HeaderScrollingViewBehavior.java:122)
at android.support.design.widget.ViewOffsetBehavior.onLayoutChild(ViewOffsetBehavior.java:42)
at android.support.design.widget.AppBarLayout$ScrollingViewBehavior.onLayoutChild(AppBarLayout.java:1139)
at android.support.design.widget.CoordinatorLayout.onLayout(CoordinatorLayout.java:810)
at android.view.View.layout(View.java:16630)
at android.view.ViewGroup.layout(ViewGroup.java:5437)
at android.widget.FrameLayout.layoutChildren(FrameLayout.java:336)
at android.widget.FrameLayout.onLayout(FrameLayout.java:273)
at android.view.View.layout(View.java:16630)
at android.view.ViewGroup.layout(ViewGroup.java:5437)
at android.widget.LinearLayout.setChildFrame(LinearLayout.java:1743)
at android.widget.LinearLayout.layoutVertical(LinearLayout.java:1586)
at android.widget.LinearLayout.onLayout(LinearLayout.java:1495)
at android.view.View.layout(View.java:16630)
at android.view.ViewGroup.layout(ViewGroup.java:5437)
at android.widget.FrameLayout.layoutChildren(FrameLayout.java:336)
at android.widget.FrameLayout.onLayout(FrameLayout.java:273)
at android.view.View.layout(View.java:16630)
at android.view.ViewGroup.layout(ViewGroup.java:5437)
at android.widget.LinearLayout.setChildFrame(LinearLayout.java:1743)
at android.widget.LinearLayout.layoutVertical(LinearLayout.java:1586)
at android.widget.LinearLayout.onLayout(LinearLayout.java:1495)
at android.view.View.layout(View.java:16630)
at android.view.ViewGroup.layout(ViewGroup.java:5437)
at android.widget.FrameLayout.layoutChildren(FrameLayout.java:336)
at android.widget.FrameLayout.onLayout(FrameLayout.java:273)
at com.android.internal.policy.PhoneWindow$DecorView.onLayout(PhoneWindow.java:2678)
at android.view.View.layout(View.java:16630)
at android.view.ViewGroup.layout(ViewGroup.java:5437)
at android.view.ViewRootImpl.performLayout(ViewRootImpl.java:2171)
at android.vi
第二嘗試：
try {
JSONObject response = new JSONObject(result);
JSONObject feed_object = response.getJSONObject("feed");
PostItems item = new PostItems();
item.setAuthor(feed_object.getString("title"));
JSONArray items_arr = response.getJSONArray("items");
for (int i = 0; i < items_arr.length(); i++) {
JSONObject post = items_arr.getJSONObject(i);
PostItems item2 = new PostItems();
item2.setTitle(post.getString("title"));
item2.setDate(post.getString("pubDate"));
feedItem.add(item2);
}
feedItem.add(item);
}
其實，我已經嘗試過什麼，你甚至可以把它想象，看到計算器上的任何問題，我不能沒有找到像這樣的問題，但有一次，只顯示一個項目沒有來自對象的正確數據，一次沒有顯示來自Array的正確數據。
任何幫助將是偉大的。
什麼是行'MyRecyclerAdapter.java：34'？ – Blackbelt
這就是它，'feedListRowHolder.author.setText（Html.fromHtml（feedItem.getAuthor（）））;'但我認爲這不是重點，這只是當我試圖設置這條線兩次llike第二代碼：'feedItem.add（item2）; feedItem.add（item）;' – Mohsen
'getAuthor'返回null。請注意：\t 'PostItems item = new PostItems（）;'應該在每個for循環的實例化處--blackbelt剛剛編輯 – Blackbelt