0
は、私は数時間のために解決することができなかった問題に遭遇しているとコミュニティが助けることができる期待しています。アンドロイド、JSON解析エラー
、このアプリケーションのポイントは、JSONデータを取得し、唯一のサムネイルURLとタイトルが表示されますカスタムリストビューに表示されます。
JSONの構文解析エラーが何らかの原因で停止しているように見えることから、カスタムリストビューを呼び出して設定しようとすると、空の文字列配列が渡されていますJSONの解析。
問題のエラーは、次のようになります。
E/Zygote: v2
I/libpersona: KNOX_SDCARD checking this for 10010
I/libpersona: KNOX_SDCARD not a persona
E/Zygote: accessInfo : 0
W/SELinux: SELinux selinux_android_compute_policy_index : Policy Index[2], Con:u:r:zygote:s0 RAM:SEPF_SECMOBILE_7.0_0005, [-1 -1 -1 -1 0 1]
I/SELinux: SELinux: seapp_context_lookup: seinfo=untrusted, level=s0:c512,c768, pkgname=com.example.user.remotemachineuilayout
I/art: Late-enabling -Xcheck:jni
D/TimaKeyStoreProvider: TimaKeyStore is not enabled: cannot add TimaSignature Service and generateKeyPair Service
06-29 09:22:16.042 31340-31350/? I/art: Debugger is no longer active
06-29 09:22:16.042 31340-31350/? I/art: Starting a blocking GC Instrumentation
06-29 09:22:16.166 31340-31340/? W/System: ClassLoader referenced unknown path: /data/app/com.example.user.remotemachineuilayout-1/lib/arm64
06-29 09:22:16.185 31340-31340/? I/InstantRun: starting instant run server: is main process
06-29 09:22:16.247 31340-31340/? W/art: Before Android 4.1, method android.graphics.PorterDuffColorFilter android.support.graphics.drawable.VectorDrawableCompat.updateTintFilter(android.graphics.PorterDuffColorFilter, android.content.res.ColorStateList, android.graphics.PorterDuff$Mode) would have incorrectly overridden the package-private method in android.graphics.drawable.Drawable
06-29 09:22:16.316 31340-31340/? D/AbsListView: Get MotionRecognitionManager
06-29 09:22:16.317 31340-31340/? D/MotionRecognitionManager: mSContextService = com[email protected]ed99b7a
06-29 09:22:16.318 31340-31340/? D/MotionRecognitionManager: motionService = c[email protected]a628f2b
06-29 09:22:16.318 31340-31340/? D/MotionRecognitionManager: motionService = c[email protected]a628f2b
06-29 09:22:16.323 31340-31340/? D/AndroidRuntime: Shutting down VM
06-29 09:22:16.323 31340-31340/? E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.example.user.remotemachineuilayout, PID: 31340
java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.user.remotemachineuilayout/com.example.user.remotemachineuilayout.MainActivity}: java.lang.NullPointerException
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2927)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2988)
at android.app.ActivityThread.-wrap14(ActivityThread.java)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1631)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:154)
at android.app.ActivityThread.main(ActivityThread.java:6682)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1520)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1410)
Caused by: java.lang.NullPointerException
at java.util.Objects.requireNonNull(Objects.java:203)
at java.util.Arrays$ArrayList.<init>(Arrays.java:3826)
at java.util.Arrays.asList(Arrays.java:3813)
at android.widget.ArrayAdapter.<init>(ArrayAdapter.java:139)
at com.example.user.remotemachineuilayout.CustomAdapter.<init>(CustomAdapter.java:0)
at com.example.user.remotemachineuilayout.MainActivity.onCreate(MainActivity.java:49)
at android.app.Activity.performCreate(Activity.java:6942)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1126)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2880)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2988)
at android.app.ActivityThread.-wrap14(ActivityThread.java)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1631)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:154)
at android.app.ActivityThread.main(ActivityThread.java:6682)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1520)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1410)
06-29 09:22:16.325 31340-31391/? D/NetworkSecurityConfig: No Network Security Config specified, using platform default
06-29 09:22:16.327 31340-31391/? I/System.out: (HTTPLog)-Static: isSBSettingEnabled false
06-29 09:22:16.327 31340-31391/? I/System.out: (HTTPLog)-Static: isSBSettingEnabled false
06-29 09:22:16.512 31340-31391/? E/MainActivity: Response from url: [
{
"albumId": 1,
"id": 1,
"title": "accusamus beatae ad facilis cum similique qui sunt",
"url": "http://placehold.it/600/92c952",
"thumbnailUrl": "http://placehold.it/150/92c952"
},
{
"albumId": 1,
"id": 2,
"title": "reprehenderit est deserunt velit ipsam",
"url": "http://placehold.it/600/771796",
"thumbnailUrl": "http://placehold.it/150/771796"
},
{
"albumId": 1,
"id": 3,
"title": "officia porro iure quia iusto qui ipsa ut modi",
"url": "http://placehold.it/600/24f355",
"thumbnailUrl": "http://placehold.it/150/24f355"
},
{
"albumId": 1,
"id": 4,
"title": "culpa odio esse rerum omnis laboriosam voluptate repudiandae",
"url": "http://placehold.it/600/d32776",
"thumbnailUrl": "http://placehold.it/150/d32776"
},
{
"albumId": 1,
"id": 5,
"title": "natus nisi omnis corporis facere molestiae rerum in",
"url": "http://placehold.it/600/f66b97",
"thumbnailUrl": "http://placehold.it/150/f66b97"
},
{
"albumId": 1,
"id": 6,
"title": "accusamus ea aliquid et amet sequi nemo",
"url": "http://placehold.it/600/56a8c2",
"thumbnailUrl": "http://placehold.it/150/56a8c2"
},
{
"albumId": 1,
"id": 7,
"title": "officia delectus consequatur vero aut veniam explicabo molestias",
"url": "http://placehold.it/600/b0f7cc",
"thumbnailUrl": "http://placehold.it/150/b0f7cc"
},
{
"albumId": 1,
"id": 8,
"title": "aut porro officiis laborum odit ea laudantium corporis",
"url": "http://placehold.it/600/54176f",
"thumbnailUrl": "http://placehold.it/150/54176f"
},
{
"albumId": 1,
"id": 9,
"title": "qui eius qui autem sed",
"url": "http://placehold.it/600/51aa97",
"thumbnailUrl": "http://placehold.it/150/51aa97"
},
{
"albumId": 1,
"id": 10,
"title": "beatae et provident et ut vel",
"url": "http://placehold.it/600/810b14",
"thumbnailUrl": "http://placehold.it/150/810b14"
},
{
"albumId": 1,
"id": 11,
"title": "nihil at amet non hic quia qui",
"url": "http://placehold.it/600/1ee8a4",
"thumbnailUrl": "http://placehold.it/150/1ee8a4"
},
{
"albumId": 1,
"id": 12,
"title": "mollitia soluta ut rerum eos aliquam consequatur perspiciatis maiores",
"url": "http://placehold.it/600/66b7d2",
"thumbnailUrl": "http://placehold.it/150/66b7d2"
},
{
"albumId": 1,
"id": 13,
"title": "repudiandae iusto deleniti rerum",
"url": "http://placehold.it/600/197d29",
"thumbnailUrl": "http://placehold.it/150/197d29"
},
{
"albumId": 1,
"id": 14,
"title": "est necessitatibus architecto ut laborum",
"url": "http://placehold.it/600/61a65",
"thumbnailUrl": "http://placehold.it/150/61a65"
},
{
"albumId": 1,
"id": 15,
"title": "harum dicta similique quis dolore earum ex qui",
"url": "http://placehold.it/600/f9cee5",
"thumbnailUrl": "http://placehold.it/150/f9cee5"
},
{
"albumId": 1,
"id": 16,
"title": "iusto sunt nobis quasi veritatis quas expedita voluptatum deserunt",
"url": "http://placehold.it/600/fdf73e",
"thumbnailUrl": "http://placehold.it/150/fdf73e"
},
{
"albumId": 1,
"id": 17,
"title": "natus doloribus necessitatibus ipsa",
"url": "http://placehold.it/600/9c184f",
"thumbnailUrl": "http://placehold.it/150/9c184f"
},
{
"albumId": 1,
"id": 18,
"title": "laboriosam odit nam necessitatibus et illum dolores reiciendis",
"url": "http://placehold.it/600/1fe46f",
"thumbnailUrl": "http://placehold.it/150/1fe46f"
},
{
"albumId": 1,
"id": 19,
"title": "perferendis nesciunt eveniet et optio a",
"url": "http://placehold.it/600/56acb2",
"thumbnailUrl": "http://placehold.it/150/56acb2"
},
{
"albumId": 1,
"id": 20,
"title": "assumenda voluptatem laboriosam enim consequatur veniam placeat reiciendis error",
"url": "http://placehold.it/600/8985dc",
"thumbnailUrl": "http://p
06-29 09:22:16.775 31340-31391/? E/MainActivity: Json parsing error: Value [{"albumId":1,"id":1,"title":"accusamus beatae ad facilis cum similique qui sunt","url":"http:\/\/placehold.it\/600\/92c952","thumbnailUrl":"http:\/\/placehold.it\/150\/92c952"},{"albumId":1,"id":2,"title":"reprehenderit est deserunt velit ipsam","url":"http:\/\/placehold.it\/600\/771796","thumbnailUrl":"http:\/\/placehold.it\/150\/771796"},{"albumId":1,"id":3,"title":"officia porro iure quia iusto qui ipsa ut modi","url":"http:\/\/placehold.it\/600\/24f355","thumbnailUrl":"http:\/\/placehold.it\/150\/24f355"},{"albumId":1,"id":4,"title":"culpa odio esse rerum omnis laboriosam voluptate repudiandae","url":"http:\/\/placehold.it\/600\/d32776","thumbnailUrl":"http:\/\/placehold.it\/150\/d32776"},{"albumId":1,"id":5,"title":"natus nisi omnis corporis facere molestiae rerum in","url":"http:\/\/placehold.it\/600\/f66b97","thumbnailUrl":"http:\/\/placehold.it\/150\/f66b97"},{"albumId":1,"id":6,"title":"accusamus ea aliquid et amet sequi nemo","url":"http:\/\/placehold.it\/600\/56a8c2","thumbnailUrl":"http:\/\/placehold.it\/150\/56a8c2"},{"albumId":1,"id":7,"title":"officia delectus consequatur vero aut veniam explicabo molestias","url":"http:\/\/placehold.it\/600\/b0f7cc","thumbnailUrl":"http:\/\/placehold.it\/150\/b0f7cc"},{"albumId":1,"id":8,"title":"aut porro officiis laborum odit ea laudantium corporis","url":"http:\/\/placehold.it\/600\/54176f","thumbnailUrl":"http:\/\/placehold.it\/150\/54176f"},{"albumId":1,"id":9,"title":"qui eius qui autem sed","url":"http:\/\/placehold.it\/600\/51aa97","thumbnailUrl":"http:\/\/placehold.it\/150\/51aa97"},{"albumId":1,"id":10,"title":"beatae et provident et ut vel","url":"http:\/\/placehold.it\/600\/810b14","thumbnailUrl":"http:\/\/placehold.it\/150\/810b14"},{"albumId":1,"id":11,"title":"nihil at amet non hic quia qui","url":"http:\/\/placehold.it\/600\/1ee8a4","thumbnailUrl":"http:\/\/placehold.it\/150\/1ee8a4"},{"albumId":1,"id":12,"title":"mollitia soluta ut rerum eos aliquam consequatur perspiciatis maiores","url":"http:\/\/placehold.it\/600\/66b7d2","thumbnailUrl":"http:\/\/placehold.it\/150\/66b7d2"},{"albumId":1,"id":13,"title":"repudiandae iusto deleniti rerum","url":"http:\/\/placehold.it\/600\/197d29","thumbnailUrl":"http:\/\/placehold.it\/150\/197d29"},{"albumId":1,"id":14,"title":"est necessitatibus architecto ut laborum","url":"http:\/\/placehold.it\/600\/61a65","thumbnailUrl":"http:\/\/placehold.it\/150\/61a65"},{"albumId":1,"id":15,"title":"harum dicta similique quis dolore earum ex qui","url":"http:\/\/placehold.it\/600\/f9cee5","thumbnailUrl":"http:\/\/placehold.it\/150\/f9cee5"},{"albumId":1,"id":16,"title":"iusto sunt nobis quasi veritatis quas expedita voluptatum deserunt","url":"http:\/\/placehold.it\/600\/fdf73e","thumbnailUrl":"http:\/\/placehold.it\/150\/fdf73e"},{"albumId":1,"id":17,"title":"natus doloribus necessitatibus ipsa","url":"http:\/\/placehold.it\/600\/9c184f","thumbnailUrl":"http:\/\/placehold.it\/150\/9c184f"},{"albumId":1,"id":18,"title":"laboriosam odit nam necessitatibus et illum dolores reiciendis","url":"http:\/\/placehold.it\/600\/1fe46f","thumbnailUrl":"http:\/\/placehold.it\/150\/1fe46f"},{"albumId":1,"id":19,"title":"perferendis nesciunt eveniet et optio a","url":"http:\/\/placehold.it\/600\/56acb2","thumbnailUrl":"http:\/\/placehold.it\/150\/56acb2"},{"albumId":1,"id":20,"title":"assumenda voluptatem laboriosam enim consequatur veniam placeat reiciendis error","url":"http:\/\/placehold.it\/600\/8985dc","thumbnailUrl":"http:\/\/placehold.it\/150\/8985dc"},{"albumId":1,"id":21,"title":"ad et natus qui","url":"http:\/\/placehold.it\/600\/5e12c6","thumbnailUrl":"http:\/\/placehold.it\/150\/5e12c6"},{"albumId":1,"id":22,"title":"et ea illo et sit voluptas animi blanditiis porro","url":"http:\/\/placehold.it\/600\/45601a","thumbnailUrl":"http:\/\/placehold.it\/150\/45601a"},{"albumId":1,"id":23,"title":"harum velit vero totam","url":"http:\/\/placehold.it\/600\/e924e6","thumbnailUrl":"http:\/\/placehold.it\/150\/e924e6"},{"albumId":1,"id":24,"title":"beatae officiis ut aut","
私のコードは以下の通りです。
MainActivity
package com.example.user.remotemachineuilayout;
import android.os.AsyncTask;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.webkit.HttpAuthHandler;
import android.widget.ListView;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.ListAdapter;
import android.widget.Toast;
import android.util.Log;
import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.util.EntityUtils;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
import java.util.HashMap;
import java.io.IOException;
import java.util.ArrayList;
import org.apache.http.client.HttpClient;
public class MainActivity extends AppCompatActivity {
String[] photoLast;
String [] titleLast;
ArrayList<String> urlPhoto = new ArrayList<String>();
ArrayList<String> titleName = new ArrayList<String>();
ListView jsonDisplay;
CustomAdapter displayAdapter;
final static String URL = "http://jsonplaceholder.typicode.com/photos";
private String TAG = MainActivity.class.getSimpleName();
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
new Read().execute();
displayAdapter = new CustomAdapter(MainActivity.this,titleLast, photoLast);
jsonDisplay = (ListView) findViewById(R.id.jsonDisplay);
jsonDisplay.setAdapter(displayAdapter);
// jsonDisplay = (ListView) findViewById(R.id.jsonDisplay);
// displayAdapter = new CustomAdapter(this, title);
// jsonDisplay.setAdapter(displayAdapter);
}
public class Read extends AsyncTask <Void, Void, Void> {
@Override
protected void onPreExecute() {
super.onPreExecute();
}
@Override
protected Void doInBackground(Void... arg0) {
//TODO Auto-generated method stub
HttpHandler sh = new HttpHandler();
String url = URL;
String jsonStr = sh.makeServiceCall(url);
Log.e(TAG, "Response from url: " + jsonStr);
if(jsonStr != null) {
try {
JSONObject json = new JSONObject(jsonStr);
JSONArray photos = json.getJSONArray("photos");
photoLast = new String[photos.length()];
titleLast = new String[photos.length()];
for (int i = 0; i < photos.length(); i++) {
JSONObject temp = photos.getJSONObject(i);
String title = temp.getString("title");
String thumbNailURL = temp.getString("thumbnailUrl");
photoLast[i]=thumbNailURL;
titleLast[i]=title;
// urlPhoto.add(thumbNailURL);
// titleName.add(title);
}
} catch (final JSONException e) {
Log.e(TAG, "Json parsing error: " + e.getMessage());
runOnUiThread(new Runnable() {
@Override
public void run() {
Toast.makeText(getApplicationContext(),
"Json parsing error2: " + e.getMessage(),
Toast.LENGTH_LONG).show();
}
});
}
} else{
Log.e(TAG, "Couldn't get json from server.");
runOnUiThread(new Runnable() {
@Override
public void run() {
Toast.makeText(getApplicationContext(),
"Couldn't get json from server. Check LogCat for possible errors!",
Toast.LENGTH_LONG).show();
}
});
}
return null;
}
@Override
protected void onPostExecute(Void result){
//TODO Auto-Generated method stub
//photoLast = urlPhoto.toArray(photoLast);
//titleLast = titleName.toArray(titleLast);
super.onPostExecute(result);
}
}
}
のHttpHandler（過去のテキストの制限私は、コードを持ってどこに入れて、削除する必要があります）
https://www.tutorialspoint.com/android/android_json_parser.htm
CustomAdapter
package com.example.user.remotemachineuilayout;
/**
* Created by User on 6/29/2017.
*/
import android.content.Context;
import android.support.annotation.LayoutRes;
import android.support.annotation.NonNull;
import android.support.annotation.Nullable;
import android.view.View;
import android.view.LayoutInflater;
import android.view.ViewGroup;
import android.widget.ImageView;
import android.widget.TextView;
import android.widget.ArrayAdapter;
import android.app.Activity;
import com.squareup.picasso.Picasso;
import java.util.ArrayList;
import static com.example.user.remotemachineuilayout.R.id.url;
public class CustomAdapter extends ArrayAdapter<String> {
//private final Activity context;
private final String[] titleList;
private final String[] urlList;
public CustomAdapter(Context context1, String[] title, String[] url) {
super(context1, R.layout.custom_row, title);
//this.context = context1;
this.titleList = title;
this.urlList = url;
}
@NonNull
@Override
public View getView(int position, @Nullable View convertView, @NonNull ViewGroup parent) {
LayoutInflater inflater = LayoutInflater.from(getContext());
View rowView = inflater.inflate(R.layout.custom_row,parent,false);
TextView txtTitle = (TextView) rowView.findViewById(R.id.title);
ImageView imageView = (ImageView) rowView.findViewById(url);
txtTitle.setText(titleList[position]);
Picasso.with(this.getContext()).load(urlList[position]).into(imageView);
return rowView;
}
}
最初の 'new Read（）。execute（）;'は非同期で、2番目にあなたの応答に '写真'のjsonarrayを見ることができません。 –
あなたの権利と別のユーザもそれを指摘しました。頭がおかげでありがとう、私はなぜ私も写真jsonarrayを入れてもわからない – user3051442
明らかにnullポインタの例外。間違った名前から値を取得しているか、jsonに抽出したいものが含まれていません。 –