Android JSON解析不工作_Android_Json_Android Layout_Android Listview_Getjson

Android JSON解析不工作

android json android-layout

Android JSON解析不工作,android,json,android-layout,android-listview,getjson,Android,Json,Android Layout,Android Listview,Getjson,我使用教程从JSON文件中获取数据，并将其作为列表或网格查看。但当运行此应用程序时，应用程序会崩溃并退出。我在代码上找不到任何错误。您可以从上面的教程链接下载源代码。但是我在这里提供了类文件。请有人帮我尽快解决这个问题。提前谢谢 AndroidJSONParsingActivity.java package com.example.samplejsonparsing; import java.util.ArrayList; import java.util.HashMap; import o

我使用教程从JSON文件中获取数据，并将其作为列表或网格查看。但当运行此应用程序时，应用程序会崩溃并退出。我在代码上找不到任何错误。您可以从上面的教程链接下载源代码。但是我在这里提供了类文件。请有人帮我尽快解决这个问题。提前谢谢

AndroidJSONParsingActivity.java

package com.example.samplejsonparsing;

import java.util.ArrayList;
import java.util.HashMap;

import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;

import android.app.ListActivity;
import android.content.Intent;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.ListAdapter;
import android.widget.ListView;
import android.widget.SimpleAdapter;
import android.widget.TextView;

public class AndroidJSONParsingActivity extends ListActivity {

    // url to make request
    private static String url = "http://api.androidhive.info/contacts/";

    // JSON Node names
    private static final String TAG_CONTACTS = "contacts";
    private static final String TAG_ID = "id";
    private static final String TAG_NAME = "name";
    private static final String TAG_EMAIL = "email";
    private static final String TAG_ADDRESS = "address";
    private static final String TAG_GENDER = "gender";
    private static final String TAG_PHONE = "phone";
    private static final String TAG_PHONE_MOBILE = "mobile";
    private static final String TAG_PHONE_HOME = "home";
    private static final String TAG_PHONE_OFFICE = "office";

    // contacts JSONArray
    JSONArray contacts = null;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);

        // Hashmap for ListView
        ArrayList<HashMap<String, String>> contactList = new ArrayList<HashMap<String, String>>();

        // Creating JSON Parser instance
        JSONParser jParser = new JSONParser();

        // getting JSON string from URL
        JSONObject json = jParser.getJSONFromUrl(url);

        try {
            // Getting Array of Contacts
            contacts = json.getJSONArray(TAG_CONTACTS);

            // looping through All Contacts
            for(int i = 0; i < contacts.length(); i++){
                JSONObject c = contacts.getJSONObject(i);

                // Storing each json item in variable
                String id = c.getString(TAG_ID);
                String name = c.getString(TAG_NAME);
                String email = c.getString(TAG_EMAIL);
                String address = c.getString(TAG_ADDRESS);
                String gender = c.getString(TAG_GENDER);

                // Phone number is agin JSON Object
                JSONObject phone = c.getJSONObject(TAG_PHONE);
                String mobile = phone.getString(TAG_PHONE_MOBILE);
                String home = phone.getString(TAG_PHONE_HOME);
                String office = phone.getString(TAG_PHONE_OFFICE);

                // creating new HashMap
                HashMap<String, String> map = new HashMap<String, String>();

                // adding each child node to HashMap key => value
                map.put(TAG_ID, id);
                map.put(TAG_NAME, name);
                map.put(TAG_EMAIL, email);
                map.put(TAG_PHONE_MOBILE, mobile);

                // adding HashList to ArrayList
                contactList.add(map);
            }
        } catch (JSONException e) {
            e.printStackTrace();
        }


        /**
         * Updating parsed JSON data into ListView
         * */
        ListAdapter adapter = new SimpleAdapter(this, contactList,
                R.layout.list_item,
                new String[] { TAG_NAME, TAG_EMAIL, TAG_PHONE_MOBILE }, new int[] {
                        R.id.name, R.id.email, R.id.mobile });

        setListAdapter(adapter);

        // selecting single ListView item
        ListView lv = getListView();

        // Launching new screen on Selecting Single ListItem
        lv.setOnItemClickListener(new OnItemClickListener() {

            @Override
            public void onItemClick(AdapterView<?> parent, View view,
                    int position, long id) {
                // getting values from selected ListItem
                String name = ((TextView) view.findViewById(R.id.name)).getText().toString();
                String cost = ((TextView) view.findViewById(R.id.email)).getText().toString();
                String description = ((TextView) view.findViewById(R.id.mobile)).getText().toString();

                // Starting new intent
                Intent in = new Intent(getApplicationContext(), SingleMenuItemActivity.class);
                in.putExtra(TAG_NAME, name);
                in.putExtra(TAG_EMAIL, cost);
                in.putExtra(TAG_PHONE_MOBILE, description);
                startActivity(in);

            }
        });



    }

}

package com.example.samplejsonparsing;

import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.widget.TextView;

public class SingleMenuItemActivity  extends Activity {

    // JSON node keys
    private static final String TAG_NAME = "name";
    private static final String TAG_EMAIL = "email";
    private static final String TAG_PHONE_MOBILE = "mobile";
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.single_list_item);

        // getting intent data
        Intent in = getIntent();

        // Get JSON values from previous intent
        String name = in.getStringExtra(TAG_NAME);
        String cost = in.getStringExtra(TAG_EMAIL);
        String description = in.getStringExtra(TAG_PHONE_MOBILE);

        // Displaying all values on the screen
        TextView lblName = (TextView) findViewById(R.id.name_label);
        TextView lblCost = (TextView) findViewById(R.id.email_label);
        TextView lblDesc = (TextView) findViewById(R.id.mobile_label);

        lblName.setText(name);
        lblCost.setText(cost);
        lblDesc.setText(description);
    }
}

SingleMenuItemActivity.java

package com.example.samplejsonparsing;

import java.util.ArrayList;
import java.util.HashMap;

import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;

import android.app.ListActivity;
import android.content.Intent;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.ListAdapter;
import android.widget.ListView;
import android.widget.SimpleAdapter;
import android.widget.TextView;

public class AndroidJSONParsingActivity extends ListActivity {

    // url to make request
    private static String url = "http://api.androidhive.info/contacts/";

    // JSON Node names
    private static final String TAG_CONTACTS = "contacts";
    private static final String TAG_ID = "id";
    private static final String TAG_NAME = "name";
    private static final String TAG_EMAIL = "email";
    private static final String TAG_ADDRESS = "address";
    private static final String TAG_GENDER = "gender";
    private static final String TAG_PHONE = "phone";
    private static final String TAG_PHONE_MOBILE = "mobile";
    private static final String TAG_PHONE_HOME = "home";
    private static final String TAG_PHONE_OFFICE = "office";

    // contacts JSONArray
    JSONArray contacts = null;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);

        // Hashmap for ListView
        ArrayList<HashMap<String, String>> contactList = new ArrayList<HashMap<String, String>>();

        // Creating JSON Parser instance
        JSONParser jParser = new JSONParser();

        // getting JSON string from URL
        JSONObject json = jParser.getJSONFromUrl(url);

        try {
            // Getting Array of Contacts
            contacts = json.getJSONArray(TAG_CONTACTS);

            // looping through All Contacts
            for(int i = 0; i < contacts.length(); i++){
                JSONObject c = contacts.getJSONObject(i);

                // Storing each json item in variable
                String id = c.getString(TAG_ID);
                String name = c.getString(TAG_NAME);
                String email = c.getString(TAG_EMAIL);
                String address = c.getString(TAG_ADDRESS);
                String gender = c.getString(TAG_GENDER);

                // Phone number is agin JSON Object
                JSONObject phone = c.getJSONObject(TAG_PHONE);
                String mobile = phone.getString(TAG_PHONE_MOBILE);
                String home = phone.getString(TAG_PHONE_HOME);
                String office = phone.getString(TAG_PHONE_OFFICE);

                // creating new HashMap
                HashMap<String, String> map = new HashMap<String, String>();

                // adding each child node to HashMap key => value
                map.put(TAG_ID, id);
                map.put(TAG_NAME, name);
                map.put(TAG_EMAIL, email);
                map.put(TAG_PHONE_MOBILE, mobile);

                // adding HashList to ArrayList
                contactList.add(map);
            }
        } catch (JSONException e) {
            e.printStackTrace();
        }


        /**
         * Updating parsed JSON data into ListView
         * */
        ListAdapter adapter = new SimpleAdapter(this, contactList,
                R.layout.list_item,
                new String[] { TAG_NAME, TAG_EMAIL, TAG_PHONE_MOBILE }, new int[] {
                        R.id.name, R.id.email, R.id.mobile });

        setListAdapter(adapter);

        // selecting single ListView item
        ListView lv = getListView();

        // Launching new screen on Selecting Single ListItem
        lv.setOnItemClickListener(new OnItemClickListener() {

            @Override
            public void onItemClick(AdapterView<?> parent, View view,
                    int position, long id) {
                // getting values from selected ListItem
                String name = ((TextView) view.findViewById(R.id.name)).getText().toString();
                String cost = ((TextView) view.findViewById(R.id.email)).getText().toString();
                String description = ((TextView) view.findViewById(R.id.mobile)).getText().toString();

                // Starting new intent
                Intent in = new Intent(getApplicationContext(), SingleMenuItemActivity.class);
                in.putExtra(TAG_NAME, name);
                in.putExtra(TAG_EMAIL, cost);
                in.putExtra(TAG_PHONE_MOBILE, description);
                startActivity(in);

            }
        });



    }

}

package com.example.samplejsonparsing;

import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.widget.TextView;

public class SingleMenuItemActivity  extends Activity {

    // JSON node keys
    private static final String TAG_NAME = "name";
    private static final String TAG_EMAIL = "email";
    private static final String TAG_PHONE_MOBILE = "mobile";
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.single_list_item);

        // getting intent data
        Intent in = getIntent();

        // Get JSON values from previous intent
        String name = in.getStringExtra(TAG_NAME);
        String cost = in.getStringExtra(TAG_EMAIL);
        String description = in.getStringExtra(TAG_PHONE_MOBILE);

        // Displaying all values on the screen
        TextView lblName = (TextView) findViewById(R.id.name_label);
        TextView lblCost = (TextView) findViewById(R.id.email_label);
        TextView lblDesc = (TextView) findViewById(R.id.mobile_label);

        lblName.setText(name);
        lblCost.setText(cost);
        lblDesc.setText(description);
    }
}

也许这是一个愚蠢的问题，但请不要忽视这一点

08-08 10:18:50.240: D/AbsListView(14239): Get MotionRecognitionManager
08-08 10:18:50.285: D/AndroidRuntime(14239): Shutting down VM
08-08 10:18:50.285: W/dalvikvm(14239): threadid=1: thread exiting with uncaught exception (group=0x40ee32a0)
08-08 10:18:50.295: E/AndroidRuntime(14239): FATAL EXCEPTION: main
08-08 10:18:50.295: E/AndroidRuntime(14239): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.samplejsonparsing/com.example.samplejsonparsing.AndroidJSONParsingActivity}: android.os.NetworkOnMainThreadException
08-08 10:18:50.295: E/AndroidRuntime(14239):    at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2100)
08-08 10:18:50.295: E/AndroidRuntime(14239):    at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2125)
08-08 10:18:50.295: E/AndroidRuntime(14239):    at android.app.ActivityThread.access$600(ActivityThread.java:140)
08-08 10:18:50.295: E/AndroidRuntime(14239):    at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1227)
08-08 10:18:50.295: E/AndroidRuntime(14239):    at android.os.Handler.dispatchMessage(Handler.java:99)
08-08 10:18:50.295: E/AndroidRuntime(14239):    at android.os.Looper.loop(Looper.java:137)
08-08 10:18:50.295: E/AndroidRuntime(14239):    at android.app.ActivityThread.main(ActivityThread.java:4898)
08-08 10:18:50.295: E/AndroidRuntime(14239):    at java.lang.reflect.Method.invokeNative(Native Method)
08-08 10:18:50.295: E/AndroidRuntime(14239):    at java.lang.reflect.Method.invoke(Method.java:511)
08-08 10:18:50.295: E/AndroidRuntime(14239):    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1006)
08-08 10:18:50.295: E/AndroidRuntime(14239):    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:773)
08-08 10:18:50.295: E/AndroidRuntime(14239):    at dalvik.system.NativeStart.main(Native Method)
08-08 10:18:50.295: E/AndroidRuntime(14239): Caused by: android.os.NetworkOnMainThreadException
08-08 10:18:50.295: E/AndroidRuntime(14239):    at android.os.StrictMode$AndroidBlockGuardPolicy.onNetwork(StrictMode.java:1118)
08-08 10:18:50.295: E/AndroidRuntime(14239):    at java.net.InetAddress.lookupHostByName(InetAddress.java:385)
08-08 10:18:50.295: E/AndroidRuntime(14239):    at java.net.InetAddress.getAllByNameImpl(InetAddress.java:236)
08-08 10:18:50.295: E/AndroidRuntime(14239):    at java.net.InetAddress.getAllByName(InetAddress.java:214)
08-08 10:18:50.295: E/AndroidRuntime(14239):    at org.apache.http.impl.conn.DefaultClientConnectionOperator.openConnection(DefaultClientConnectionOperator.java:137)
08-08 10:18:50.295: E/AndroidRuntime(14239):    at org.apache.http.impl.conn.AbstractPoolEntry.open(AbstractPoolEntry.java:164)
08-08 10:18:50.295: E/AndroidRuntime(14239):    at org.apache.http.impl.conn.AbstractPooledConnAdapter.open(AbstractPooledConnAdapter.java:119)
08-08 10:18:50.295: E/AndroidRuntime(14239):    at org.apache.http.impl.client.DefaultRequestDirector.execute(DefaultRequestDirector.java:360)
08-08 10:18:50.295: E/AndroidRuntime(14239):    at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:670)
08-08 10:18:50.295: E/AndroidRuntime(14239):    at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:509)
08-08 10:18:50.295: E/AndroidRuntime(14239):    at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:487)
08-08 10:18:50.295: E/AndroidRuntime(14239):    at com.example.samplejsonparsing.JSONParser.getJSONFromUrl(JSONParser.java:38)
08-08 10:18:50.295: E/AndroidRuntime(14239):    at com.example.samplejsonparsing.AndroidJSONParsingActivity.onCreate(AndroidJSONParsingActivity.java:54)
08-08 10:18:50.295: E/AndroidRuntime(14239):    at android.app.Activity.performCreate(Activity.java:5206)
08-08 10:18:50.295: E/AndroidRuntime(14239):    at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1083)
08-08 10:18:50.295: E/AndroidRuntime(14239):    at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2064)
08-08 10:18:50.295: E/AndroidRuntime(14239):    ... 11 more
08-08 10:19:39.280: I/Process(14239): Sending signal. PID: 14239 SIG: 9

雄激素单

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.example.samplejsonparsing"
    android:versionCode="1"
    android:versionName="1.0" >

    <uses-sdk
        android:minSdkVersion="8"
        android:targetSdkVersion="17" />

    <uses-permission android:name="android.permission.INTERNET"/>

    <application
        android:allowBackup="true"
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name"
        android:theme="@style/AppTheme" >
        <activity
            android:name="com.example.samplejsonparsing.AndroidJSONParsingActivity"
            android:label="@string/app_name" >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
        <activity
            android:label="@string/app_name"
            android:name="com.example.samplejsonparsing.SingleMenuItemActivity" >
        </activity>
    </application>

</manifest>

我已经下载了该项目并在我的系统上进行了编译。工作正常。如果已添加“INTERNET”权限，请检查Manifest.xml。请在此处添加您的Logcat输出，以便了解错误是什么。

请将确切的错误与来自crash的Logcat输出一起发布。某种“offtop”，但我建议您使用Google的gson库解析json。代码将更小。可能与logcat的第5行中的See重复：08-08 10:18:50.295:E/AndroidRuntime（14239）：java.lang.RuntimeException:无法启动活动组件信息{com.example.samplejsonparsing/com.example.sampleJSONParsingActivity}：android.os.NetworkOnMainThreadException它表示从URL获取JSON的网络连接正在主UI进程线程上执行。在最新版本的Android 4.0及以上版本中，网络线程必须使用异步任务在后台线程中运行，否则应用程序将崩溃。您可以使用以下两个链接了解异步任务：，@Kabelash:如果解决方案对您有所帮助，请接受答案。我真的需要增加我的回购。