JSON 加载/获取正确但无法显示
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【中文标题】JSON 加载/获取正确但无法显示【英文标题】：JSON loading/fetching properly but unable to display 【发布时间】：2017-10-08 15:32:20 【问题描述】：检查了我的 JSON 提取是否正确，没有错误，因为解析完成得很完美，但应用程序没有显示任何结果（显示了一个空列表视图）。 如果有人可以帮助我解决这个问题，那就提供我所有的文件。 注意：该应用程序没有显示任何错误，它只是显示空白列表视图。
WordActivity.java
package com.example.anandparmeetsingh.books;
import android.app.LoaderManager;
import android.content.Context;
import android.content.Loader;
import android.net.ConnectivityManager;
import android.net.NetworkInfo;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.widget.ListView;
import android.widget.TextView;
import java.util.ArrayList;
import java.util.List;
public class WordActivity extends AppCompatActivity implements LoaderManager.LoaderCallbacks<List<Word>>
private static final int EARTHQUAKE_LOADER_ID = 1;
private static final String LOG_TAG = WordActivity.class.getName();
/**
* URL for earthquake data from the USGS dataset
*/
private static final String USGS_REQUEST_URL =
"https://earthquake.usgs.gov/fdsnws/event/1/query?format=geojson&starttime=2014-01-01&endtime=2014-01-02";
/**
* Adapter for the list of earthquakes
*/
public WordAdapter mAdapter;
private TextView mEmptyStateTextView;
@Override
protected void onCreate(Bundle bundle)
super.onCreate(bundle);
setContentView(R.layout.activity_word);
// Get a reference to the LoaderManager, in order to interact with loaders.
mAdapter = new WordAdapter(this, new ArrayList<Word>());
ListView earthquakeListView = (ListView) findViewById(R.id.list);
// Create a new adapter that takes an empty list of earthquakes as input
final WordAdapter adapter = new WordAdapter(this, new ArrayList<Word>());
// Set the adapter on the @link ListView
// so the list can be populated in the user interface
earthquakeListView.setAdapter(mAdapter);
// Set an item click listener on the ListView, which sends an intent to a web browser
// to open a website with more information about the selected earthquake.
// Start the AsyncTask to fetch the earthquake data
//mEmptyStateTextView = (TextView) findViewById(R.id.empty_view);
//earthquakeListView.setEmptyView(mEmptyStateTextView);
ConnectivityManager connMgr = (ConnectivityManager)
getSystemService(Context.CONNECTIVITY_SERVICE);
// Get details on the currently active default data network
NetworkInfo networkInfo = connMgr.getActiveNetworkInfo();
// If there is a network connection, fetch data
if (networkInfo != null && networkInfo.isConnected())
// Get a reference to the LoaderManager, in order to interact with loaders.
LoaderManager loaderManager = getLoaderManager();
// Initialize the loader. Pass in the int ID constant defined above and pass in null for
// the bundle. Pass in this activity for the LoaderCallbacks parameter (which is valid
// because this activity implements the LoaderCallbacks interface).
loaderManager.initLoader(EARTHQUAKE_LOADER_ID, null, this);
else
// Otherwise, display error
// First, hide loading indicator so error message will be visible
//View loadingIndicator = findViewById(R.id.loading_indicator);
//loadingIndicator.setVisibility(View.GONE);
//Update empty state with no connection error message
//mEmptyStateTextView.setText("No Connection");
public Loader<List<Word>> onCreateLoader(int i, Bundle bundle)
return new WordLoader(this, USGS_REQUEST_URL);
/**
* @link to perform the network request on a background thread, and then
* update the UI with the list of earthquakes in the response.
* <p>
* AsyncTask has three generic parameters: the input type, a type used for progress updates, and
* an output type. Our task will take a String URL, and return an EarthquakeAdapter. We won't do
* progress updates, so the second generic is just Void.
* <p>
* We'll only override two of the methods of AsyncTask: doInBackground() and onPostExecute().
* The doInBackground() method runs on a background thread, so it can run long-running code
* (like network activity), without interfering with the responsiveness of the app.
* Then onPostExecute() is passed the result of doInBackground() method, but runs on the
* UI thread, so it can use the produced data to update the UI.
*/
@Override
public void onLoadFinished(Loader<List<Word>> loader, List<Word> earthquakes)
// Clear the adapter of previous earthquake data
//View loadingIndicator = findViewById(R.id.loading_indicator);
//loadingIndicator.setVisibility(View.GONE);
//mEmptyStateTextView.setText(R.string.no_earthquakes);
mAdapter.clear();
// If there is a valid list of @link Earthquakes, then add them to the adapter's
// data set. This will trigger the ListView to update.
if (earthquakes != null && !earthquakes.isEmpty())
mAdapter.addAll(earthquakes);
@Override
public void onLoaderReset(Loader<List<Word>> loader)
// Loader reset, so we can clear out our existing data.
mAdapter.clear();
Word.java
package com.example.anandparmeetsingh.books;
public class Word
private String mMagnitude;
private String mLocation;
private Long mDate;
private String mUrl;
public Word(String magnitude, String location, String url)
mMagnitude = magnitude;
mLocation = location;
mUrl = url;
public Word(String magnitude, String location, Long date, String url)
mMagnitude = magnitude;
mLocation = location;
mDate = date;
mUrl = url;
public String getMagnitude()
return mMagnitude;
public String geLocation()
return mLocation;
public Long getDate()
return mDate;
public String getUrl()return mUrl;
WordAdapter.java
package com.example.anandparmeetsingh.books;
import android.app.Activity;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.TextView;
import java.text.DecimalFormat;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Date;
/**
* Created by ParmeetSingh on 5/9/2017.
*/
public class WordAdapter extends ArrayAdapter<Word>
String primaryLocation;
String locationOffset;
String description;
private static final String LOCATION_SEPARATOR = " of ";
public WordAdapter(Activity context, ArrayList<Word> words)
// Here, we initialize the ArrayAdapter's internal storage for the context and the list.
// the second argument is used when the ArrayAdapter is populating a single TextView.
// Because this is a custom adapter for two TextViews and an ImageView, the adapter is not
// going to use this second argument, so it can be any value. Here, we used 0.
super(context, 0, words);
@Override
public View getView(int position, View convertView, ViewGroup parent)
// Check if the existing view is being reused, otherwise inflate the view
View listItemView = convertView;
if (listItemView == null)
listItemView = LayoutInflater.from(getContext()).inflate(
R.layout.activity_list_display, parent, false);
// Get the @link AndroidFlavor object located at this position in the list
Word currentWord = getItem(position);
// Find the TextView with view ID magnitude
TextView magnitudeView = (TextView) listItemView.findViewById(R.id.magnitude);
// Format the magnitude to show 1 decimal place
// Display the magnitude of the current earthquake in that TextView
magnitudeView.setText(description);
String originalLocation = currentWord.geLocation();
// Find the TextView in the list_item.xml layout with the ID version_number
TextView primaryLocationView = (TextView) listItemView.findViewById(R.id.primary_location);
// Display the location of the current earthquake in that TextView
primaryLocationView.setText(primaryLocation);
// Find the TextView with view ID location offset
TextView locationOffsetView = (TextView) listItemView.findViewById(R.id.location_offset);
// Display the location offset of the current earthquake in that TextView
locationOffsetView.setText(locationOffset);
//Date dateObject = new Date(currentWord.getDate());
// Find the TextView with view ID date
TextView dateView = (TextView) listItemView.findViewById(R.id.date);
// Format the date string (i.e. "Mar 3, 1984")
//String formattedDate = formatDate(dateObject);
// Display the date of the current earthquake in that TextView
dateView.setText(primaryLocation);
// Find the TextView with view ID time
TextView timeView = (TextView) listItemView.findViewById(R.id.time);
// Format the time string (i.e. "4:30PM")
//String formattedTime = formatTime(locationOffset);
// Display the time of the current earthquake in that TextView
timeView.setText(locationOffset);
return listItemView;
private String formatMagnitude(double magnitude)
DecimalFormat magnitudeFormat = new DecimalFormat("0.0");
return magnitudeFormat.format(magnitude);
/**
* Return the formatted date string (i.e. "Mar 3, 1984") from a Date object.
*/
private String formatDate(Date dateObject)
SimpleDateFormat dateFormat = new SimpleDateFormat("LLL dd, yyyy");
return dateFormat.format(dateObject);
private String formatTime(Date dateObject)
SimpleDateFormat timeFormat = new SimpleDateFormat("h:mm a");
return timeFormat.format(dateObject);
WordLoader.java
package com.example.anandparmeetsingh.books;
import android.content.AsyncTaskLoader;
import android.content.Context;
import java.util.List;
/**
* Created by ParmeetSingh on 5/9/2017.
*/
public class WordLoader extends AsyncTaskLoader<List<Word>>
/** Tag for log messages */
private static final String LOG_TAG = WordLoader.class.getName();
/** Query URL */
private String mUrl;
/**
* Constructs a new @link WordLoader.
*
* @param context of the activity
* @param url to load data from
*/
public WordLoader(Context context, String url)
super(context);
mUrl = url;
@Override
protected void onStartLoading()
forceLoad();
/**
* This is on a background thread.
*/
@Override
public List<Word> loadInBackground()
if (mUrl == null)
return null;
// Perform the network request, parse the response, and extract a list of earthquakes.
List<Word> earthquakes = QueryUtils.fetchEarthquakeData(mUrl);
return earthquakes;
QueryUtils.java
package com.example.anandparmeetsingh.books;
import android.text.TextUtils;
import android.util.Log;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URL;
import java.nio.charset.Charset;
import java.util.ArrayList;
import java.util.List;
/**
* Created by ParmeetSingh on 5/9/2017.
*/
public class QueryUtils
/**
* Tag for the log messages
*/
private static final String LOG_TAG = QueryUtils.class.getSimpleName();
/**
* Create a private constructor because no one should ever create a @link QueryUtils object.
* This class is only meant to hold static variables and methods, which can be accessed
* directly from the class name QueryUtils (and an object instance of QueryUtils is not needed).
*/
private QueryUtils()
/**
* Query the USGS dataset and return a list of @link WordAdapter objects.
*/
public static List<Word> fetchEarthquakeData(String requestUrl)
// Create URL object
URL url = createUrl(requestUrl);
// Perform HTTP request to the URL and receive a JSON response back
String jsonResponse = null;
try
Thread.sleep(2000);
catch (InterruptedException e)
e.printStackTrace();
try
jsonResponse = makeHttpRequest(url);
catch (IOException e)
Log.e(LOG_TAG, "Problem making the HTTP request.", e);
// Extract relevant fields from the JSON response and create a list of @link EarthquakeAdapters
List<Word> earthquake = extractFeatureFromJson(jsonResponse);
// Return the list of @link EarthquakeAdapters
return earthquake;
/**
* Returns new URL object from the given string URL.
*/
private static URL createUrl(String stringUrl)
URL url = null;
try
url = new URL(stringUrl);
catch (MalformedURLException e)
Log.e(LOG_TAG, "Problem building the URL ", e);
return url;
/**
* Make an HTTP request to the given URL and return a String as the response.
*/
private static String makeHttpRequest(URL url) throws IOException
String jsonResponse = "";
// If the URL is null, then return early.
if (url == null)
return jsonResponse;
HttpURLConnection urlConnection = null;
InputStream inputStream = null;
try
urlConnection = (HttpURLConnection) url.openConnection();
urlConnection.setReadTimeout(10000 /* milliseconds */);
urlConnection.setConnectTimeout(15000 /* milliseconds */);
urlConnection.setRequestMethod("GET");
urlConnection.connect();
// If the request was successful (response code 200),
// then read the input stream and parse the response.
if (urlConnection.getResponseCode() == HttpURLConnection.HTTP_OK)
inputStream = urlConnection.getInputStream();
jsonResponse = readFromStream(inputStream);
else
Log.e(LOG_TAG, "Error response code: " + urlConnection.getResponseCode());
catch (IOException e)
Log.e(LOG_TAG, "Problem retrieving the earthquake JSON results.", e);
finally
if (urlConnection != null)
urlConnection.disconnect();
if (inputStream != null)
// Closing the input stream could throw an IOException, which is why
// the makeHttpRequest(URL url) method signature specifies than an IOException
// could be thrown.
inputStream.close();
return jsonResponse;
/**
* Convert the @link InputStream into a String which contains the
* whole JSON response from the server.
*/
private static String readFromStream(InputStream inputStream) throws IOException
StringBuilder output = new StringBuilder();
if (inputStream != null)
InputStreamReader inputStreamReader = new InputStreamReader(inputStream, Charset.forName("UTF-8"));
BufferedReader reader = new BufferedReader(inputStreamReader);
String line = reader.readLine();
while (line != null)
output.append(line);
line = reader.readLine();
return output.toString();
/**
* Return a list of @link WordAdapter objects that has been built up from
* parsing the given JSON response.
*/
private static List<Word> extractFeatureFromJson(String earthquakeJSON)
// If the JSON string is empty or null, then return early.
if (TextUtils.isEmpty(earthquakeJSON))
return null;
// Create an empty ArrayList that we can start adding earthquakes to
List<Word> earthquakes = new ArrayList<>();
// Try to parse the JSON response string. If there's a problem with the way the JSON
// is formatted, a JSONException exception object will be thrown.
// Catch the exception so the app doesn't crash, and print the error message to the logs.
try
// Create a JSONObject from the JSON response string
JSONObject baseJsonResponse = new JSONObject(earthquakeJSON);
// Extract the JSONArray associated with the key called "features",
// which represents a list of features (or earthquakes).
JSONArray earthquakeArray = baseJsonResponse.getJSONArray("features");
// For each earthquake in the earthquakeArray, create an @link EarthquakeAdapter object
for (int i = 0; i < earthquakeArray.length(); i++)
// Get a single earthquake at position i within the list of earthquakes
JSONObject currentEarthquake = earthquakeArray.getJSONObject(i);
// For a given earthquake, extract the JSONObject associated with the
// key called "properties", which represents a list of all properties
// for that earthquake.
JSONObject properties = currentEarthquake.getJSONObject("properties");
// Extract the value for the key called "mag"
String magnitude = properties.getString("mag");
// Extract the value for the key called "place"
String location = properties.getString("place");
// Extract the value for the key called "time"
long time = properties.getLong("time");
// Extract the value for the key called "url"
String url = properties.getString("url");
// Create a new @link EarthquakeAdapter object with the magnitude, location, time,
// and url from the JSON response.
Word earthquake = new Word(magnitude, location, time, url);
// Add the new @link EarthquakeAdapter to the list of earthquakes.
earthquakes.add(earthquake);
catch (JSONException e)
// If an error is thrown when executing any of the above statements in the "try" block,
// catch the exception here, so the app doesn't crash. Print a log message
// with the message from the exception.
Log.e("QueryUtils", "Problem parsing the earthquake JSON results", e);
// Return the list of earthquakes
return earthquakes;
activity_list_display.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_
android:layout_
android:orientation="vertical"
android:paddingEnd="16dp"
android:paddingLeft="16dp"
android:paddingRight="16dp"
android:paddingStart="16dp"
tools:context="com.example.a.books.Word">
<TextView
android:id="@+id/magnitude"
android:layout_
android:layout_
android:textColor="#000000"
android:layout_gravity="center_vertical"
android:fontFamily="sans-serif-medium"
android:gravity="center"
android:layout_margin="5dp"
android:textSize="16sp"
tools:text="8.9" />
<TextView
android:id="@+id/location_offset"
android:textColor="#000000"
android:layout_
android:layout_
android:ellipsize="end"
android:fontFamily="sans-serif-medium"
android:maxLines="1"
android:textAllCaps="true"
android:textSize="12sp"
tools:text="30km S of" />
<TextView
android:id="@+id/primary_location"
android:layout_
android:layout_
android:ellipsize="end"
android:textColor="#000000"
android:maxLines="2"
android:textSize="16sp"
tools:text="Long placeholder location that should wrap to more than 2 lines of text" />
<TextView
android:id="@+id/date"
android:textColor="#000000"
android:layout_
android:layout_
android:layout_gravity="end"
android:textSize="12sp"
tools:text="Mar 6, 2010" />
<TextView
android:id="@+id/time"
android:textColor="#000000"
android:layout_
android:layout_
android:layout_gravity="end"
android:textSize="12sp"
tools:text="3:00 PM" />
</LinearLayout>
activity_word.xml
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_
android:layout_
android:orientation="horizontal">
<ListView
android:id="@+id/list"
android:layout_
android:layout_
android:orientation="vertical" />
</RelativeLayout>
AndroidManifest.xml
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.a.books">
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
<uses-permission android:name="android.permission.INTERNET"/>
<application
android:allowBackup="true"
android:icon="@mipmap/ic_launcher"
android:label="@string/app_name"
android:roundIcon="@mipmap/ic_launcher_round"
android:supportsRtl="true"
android:theme="@style/AppTheme">
<activity android:name=".WordActivity">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<activity android:name=".Word"></activity>
</application>
</manifest>
【问题讨论】：
ArrayList<Word> words检查字数
你调试响应了吗？
你在哪里设置了适配器？你调用了多少次？
与此混淆 mAdapter = new WordAdapter(this, new ArrayList使用
@Override
public void onLoadFinished(Loader<List<Word>> loader, List<Word> earthquakes)
mAdapter.clear();
if (earthquakes != null && !earthquakes.isEmpty())
mAdapter = new WordAdapter(this, earthquakes)
if (earthquakeListView.getAdapter() != null)
if (earthquakeListView.getAdapter().getCount() == 0)
earthquakeListView.setAdapter(mAdapter);
else
mAdapter.notifyDataSetChanged();
else
earthquakeListView.setAdapter(mAdapter);
【讨论】：
没用。错误：无法解析地震列表视图 它是您的列表视图对象使其成为全局对象。 做到了。仍然屏幕是空白的。 Wordadapter(this,earthquakes) 错误：WordAdapter 中的 WordAdapter (Activity, java.util.ArrayList截图在附件中，用这个替换你的代码，
import android.app.LoaderManager;
import android.content.Context;
import android.content.Loader;
import android.net.ConnectivityManager;
import android.net.NetworkInfo;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.widget.ListView;
import android.widget.TextView;
import java.util.ArrayList;
import java.util.List;
public class WordActivity extends AppCompatActivity implements LoaderManager.LoaderCallbacks<List<Word>>
private static final int EARTHQUAKE_LOADER_ID = 1;
private static final String LOG_TAG = WordActivity.class.getName();
/**
* URL for earthquake data from the USGS dataset
*/
private static final String USGS_REQUEST_URL =
"https://earthquake.usgs.gov/fdsnws/event/1/query?format=geojson&starttime=2014-01-01&endtime=2014-01-02";
/**
* Adapter for the list of earthquakes
*/
public wordAdap mAdapter;
private TextView mEmptyStateTextView;
ListView earthquakeListView;
ArrayList<Word> words;
@Override
protected void onCreate(Bundle bundle)
super.onCreate(bundle);
setContentView(R.layout.activity_word);
// Get a reference to the LoaderManager, in order to interact with loaders.
earthquakeListView=(ListView)findViewById(R.id.list1) ;
words=new ArrayList<>();
mAdapter = new wordAdap(WordActivity.this, words);
// Create a new adapter that takes an empty list of earthquakes as input
// Set the adapter on the @link ListView
// so the list can be populated in the user interface
earthquakeListView.setAdapter(mAdapter);
// Set an item click listener on the ListView, which sends an intent to a web browser
// to open a website with more information about the selected earthquake.
// Start the AsyncTask to fetch the earthquake data
//mEmptyStateTextView = (TextView) findViewById(R.id.empty_view);
//earthquakeListView.setEmptyView(mEmptyStateTextView);
ConnectivityManager connMgr = (ConnectivityManager)
getSystemService(Context.CONNECTIVITY_SERVICE);
// Get details on the currently active default data network
NetworkInfo networkInfo = connMgr.getActiveNetworkInfo();
// If there is a network connection, fetch data
if (networkInfo != null && networkInfo.isConnected())
// Get a reference to the LoaderManager, in order to interact with loaders.
LoaderManager loaderManager = getLoaderManager();
// Initialize the loader. Pass in the int ID constant defined above and pass in null for
// the bundle. Pass in this activity for the LoaderCallbacks parameter (which is valid
// because this activity implements the LoaderCallbacks interface).
loaderManager.initLoader(EARTHQUAKE_LOADER_ID, null, this);
else
// Otherwise, display error
// First, hide loading indicator so error message will be visible
//View loadingIndicator = findViewById(R.id.loading_indicator);
//loadingIndicator.setVisibility(View.GONE);
//Update empty state with no connection error message
//mEmptyStateTextView.setText("No Connection");
public Loader<List<Word>> onCreateLoader(int i, Bundle bundle)
return new WordLoader(this, USGS_REQUEST_URL);
/**
* @link to perform the network request on a background thread, and then
* update the UI with the list of earthquakes in the response.
* <p>
* AsyncTask has three generic parameters: the input type, a type used for progress updates, and
* an output type. Our task will take a String URL, and return an EarthquakeAdapter. We won't do
* progress updates, so the second generic is just Void.
* <p>
* We'll only override two of the methods of AsyncTask: doInBackground() and onPostExecute().
* The doInBackground() method runs on a background thread, so it can run long-running code
* (like network activity), without interfering with the responsiveness of the app.
* Then onPostExecute() is passed the result of doInBackground() method, but runs on the
* UI thread, so it can use the produced data to update the UI.
*/
@Override
public void onLoadFinished(Loader<List<Word>> loader, List<Word> earthquakes)
// Clear the adapter of previous earthquake data
//View loadingIndicator = findViewById(R.id.loading_indicator);
//loadingIndicator.setVisibility(View.GONE);
//mEmptyStateTextView.setText(R.string.no_earthquakes);
// mAdapter.clear();
// If there is a valid list of @link Earthquakes, then add them to the adapter's
// data set. This will trigger the ListView to update.
if (earthquakes != null && !earthquakes.isEmpty())
words.addAll(earthquakes);
mAdapter.notifyDataSetChanged();
/* words.addAll(earthquakes);
mAdapter.notifyDataSetChanged();*/
@Override
public void onLoaderReset(Loader<List<Word>> loader)
// Loader reset, so we can clear out our existing data.
// mAdapter.clear();
和你的适配器一样，
import android.app.Activity;
import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.GridView;
import android.widget.LinearLayout;
import android.widget.ListView;
import android.widget.TextView;
import java.util.ArrayList;
/**
* Created by sunisha on 10/5/17.
*/
public class wordAdap extends BaseAdapter
ArrayList<Word> Word=new ArrayList<>();
Activity mContext;
public wordAdap(Activity context, ArrayList<Word> Word)
mContext = context;
this.Word = Word;
@Override
public int getCount()
return Word.size();
@Override
public Object getItem(int pos)
return Word.get(pos);
@Override
public long getItemId(int position)
return position;
@Override
public View getView(final int position, View convertView, ViewGroup parent)
View v = convertView;
final CampaignItemViewHolders holder;
if (convertView == null)
LayoutInflater li = (LayoutInflater) mContext
.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
v = li.inflate(R.layout.activity_list_display, null);
// v = li.inflate(R.layout.aa, null);
holder = new CampaignItemViewHolders(v);
v.setTag(holder);
else
holder = (CampaignItemViewHolders) v.getTag();
String magnitude=Word.get(position).getMagnitude();
holder.magnitudeView.setText(magnitude);
return v;
class CampaignItemViewHolders
TextView magnitudeView;
public CampaignItemViewHolders(View base)
magnitudeView = (TextView) base.findViewById(R.id.magnitude);
【讨论】：
我刚刚设置了幅度，只对其他细节做同样的操作...... 嘿，谢谢你真棒。首先有一些疑问，它只是显示量级。我是Android开发的初学者，我真的不知道您使用哪种方法来获取输出。 2）如何获取其他Json数据？ 3）我的代码有什么问题？投票。请解释并解决其余问题。非常感谢。 哦，好吧....我已将您添加到聊天中，您可以检查一下吗？chat.***.com/rooms/143841/…【参考方案3】：也许您缺少notifyDataSetChanged()？
@Override
public void onLoadFinished(Loader<List<Word>> loader, List<Word> earthquakes)
mAdapter.clear();
if (earthquakes != null && !earthquakes.isEmpty())
mAdapter.addAll(earthquakes);
mAdapter.notifyDataSetChanged(); //<---- You're missing this
ArrayAdapter 仅在使用 add()、insert()、remove() 和 clear() 时自动更新
【讨论】：
添加它仍然是一个空白屏幕。以上是关于JSON 加载/获取正确但无法显示的主要内容，如果未能解决你的问题，请参考以下文章