ウェブAPIから取得したデータを配列に格納し、ListViewで表示する方法がわからず困っています。
現状としてはAPIからデータは取得できており、ListViewにアダプターをセットするところまで進んでいるのですが、エミュレーター確認すると、アプリが落ちてしまう状況です。
■MainActivity.java
public class MainActivity extends AppCompatActivity { ListView lv; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); HttpResponseAsync asyncTask = new HttpResponseAsync(); asyncTask.setOnCallBack(new HttpResponseAsync.CallBackTask() { private String[] detailWeather; @Override public void CallBack(String result) { super.CallBack(result); lv = (ListView) findViewById(R.id.listView); result = result.replace("drk7jpweather.callback(", ""); result = result.replace(");", ""); JSONObject resultJson = new JSONObject(result); JSONArray jsonArray = resultJson.getJSONObject("pref").getJSONObject("area").getJSONArray("info"); int count = jsonArray.length(); JSONObject[] jsonArrayInfo = new JSONObject[count]; String pref = resultJson.getJSONObject("pref").getJSONObject("area").getString("id"); for (int i = 0; i < count; i++) { jsonArrayInfo[i] = jsonArray.getJSONObject(i); String date = jsonArrayInfo[i].getString("date"); String weather = jsonArrayInfo[i].getString("weather"); String maxTemp = jsonArrayInfo[i].getJSONObject("temperature").getJSONArray("range").getJSONObject(0).getString("content"); String minTemp = jsonArrayInfo[i].getJSONObject("temperature").getJSONArray("range").getJSONObject(1).getString("content"); String total = pref + "\n" + date + "\n天気:" + weather + "\n最高気温:" + maxTemp + "度 最低気温:" + minTemp + "度"; detailWeather = new String[7]; detailWeather[i] = total; } ArrayAdapter<Object> adapter = new ArrayAdapter<Object>(MainActivity.this, android.R.layout.simple_list_item_1, detailWeather); lv.setAdapter(adapter); } }); asyncTask.execute(new URL("http://www.drk7.jp/weather/json/27.js")); } }
■HttpResponseAsync.java
public class HttpResponseAsync extends AsyncTask<URL, Void, String> { private CallBackTask callbacktask; final StringBuilder result = new StringBuilder(); int status = 0; @Override protected String doInBackground(URL... urls) { final URL url = urls[0]; HttpURLConnection HttpUrlConne = null; HttpUrlConne = (HttpURLConnection) url.openConnection(); HttpUrlConne.setRequestMethod("GET"); HttpUrlConne.setInstanceFollowRedirects(false); HttpUrlConne.setDoInput(true); HttpUrlConne.setRequestProperty("Accept-language", "jp"); HttpUrlConne.connect(); status = HttpUrlConne.getResponseCode(); if (status == HttpURLConnection.HTTP_OK) { final InputStream inputStream = HttpUrlConne.getInputStream(); final String encoding = "UTF-8"; final InputStreamReader inputReader = new InputStreamReader(inputStream, encoding); final BufferedReader bufferedReader = new BufferedReader(inputReader); String line = null; while ((line = bufferedReader.readLine()) != null) { result.append(line); } bufferedReader.close(); inputReader.close(); inputStream.close(); } finally { if (HttpUrlConne != null) { HttpUrlConne.disconnect(); } } return result.toString(); } @Override protected void onPostExecute(String result) { callbacktask.CallBack(result); } public void setOnCallBack(CallBackTask _cbj) { callbacktask = _cbj; } public static class CallBackTask { public void CallBack(String result) { } } }
■logcat
04-02 13:57:08.185 2129-2129/com.example.systena.apigetdate E/AndroidRuntime: FATAL EXCEPTION: main Process: com.example.systena.apigetdate, PID: 2129 java.lang.NullPointerException: Attempt to invoke virtual method 'java.lang.String java.lang.Object.toString()' on a null object reference at android.widget.ArrayAdapter.createViewFromResource(ArrayAdapter.java:394) at android.widget.ArrayAdapter.getView(ArrayAdapter.java:362) at android.widget.AbsListView.obtainView(AbsListView.java:2344) at android.widget.ListView.measureHeightOfChildren(ListView.java:1270) at android.widget.ListView.onMeasure(ListView.java:1182) at android.view.View.measure(View.java:17430) at android.widget.RelativeLayout.measureChildHorizontal(RelativeLayout.java:727) at android.widget.RelativeLayout.onMeasure(RelativeLayout.java:463) at android.view.View.measure(View.java:17430) at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5463) at android.widget.FrameLayout.onMeasure(FrameLayout.java:430) 文字数制限により削除...
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2016/04/02 22:45