我尝试将此教程应用于姜饼中并且效果很好 http://www.androidhive.info/2012/01/android-json-parsing-tutorial/ 但它在ICS上崩溃了（在三星S2和HTC一个X真实设备而不是模拟器）。
那么如何为宽范围手机编写公共应用程序..？ 在这个问题之后我今天真的感到沮丧。 即使我在你的帮助下解决了这个问题。是否有官方说明页面或类似的东西知道如何更新姜饼代码，使其与ICS兼容。 最诚挚的问候。
package com.example.json.pwd;
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.json.pwd;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.UnsupportedEncodingException;
import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.impl.client.DefaultHttpClient;
import org.json.JSONException;
import org.json.JSONObject;
import android.util.Log;
public class JSONParser {
static InputStream is = null;
static JSONObject jObj = null;
static String json = "";
// constructor
public JSONParser() {
}
public JSONObject getJSONFromUrl(String url) {
// Making HTTP request
try {
// defaultHttpClient
DefaultHttpClient httpClient = new DefaultHttpClient();
HttpPost httpPost = new HttpPost(url);
HttpResponse httpResponse = httpClient.execute(httpPost);
HttpEntity httpEntity = httpResponse.getEntity();
is = httpEntity.getContent();
} catch (UnsupportedEncodingException e) {
e.printStackTrace();
} catch (ClientProtocolException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
try {
BufferedReader reader = new BufferedReader(new InputStreamReader(
is, "iso-8859-1"), 8);
StringBuilder sb = new StringBuilder();
String line = null;
while ((line = reader.readLine()) != null) {
sb.append(line + "\n");
}
is.close();
json = sb.toString();
} catch (Exception e) {
Log.e("Buffer Error", "Error converting result " + e.toString());
}
// try parse the string to a JSON object
try {
jObj = new JSONObject(json);
} catch (JSONException e) {
Log.e("JSON Parser", "Error parsing data " + e.toString());
}
// return JSON String
return jObj;
}
}
package com.example.json.pwd;
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);
}
}
Finally Logcat
09-25 21:56:13.262: D/AndroidRuntime(1475): Shutting down VM
09-25 21:56:13.262: W/dalvikvm(1475): threadid=1: thread exiting with uncaught exception (group=0xb40a0180)
09-25 21:56:13.343: E/AndroidRuntime(1475): FATAL EXCEPTION: main
09-25 21:56:13.343: E/AndroidRuntime(1475): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.json.pwd/com.example.json.pwd.AndroidJSONParsingActivity}: android.os.NetworkOnMainThreadException
09-25 21:56:13.343: E/AndroidRuntime(1475): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1956)
09-25 21:56:13.343: E/AndroidRuntime(1475): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1981)
09-25 21:56:13.343: E/AndroidRuntime(1475): at android.app.ActivityThread.access$600(ActivityThread.java:123)
09-25 21:56:13.343: E/AndroidRuntime(1475): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1147)
09-25 21:56:13.343: E/AndroidRuntime(1475): at android.os.Handler.dispatchMessage(Handler.java:99)
09-25 21:56:13.343: E/AndroidRuntime(1475): at android.os.Looper.loop(Looper.java:137)
09-25 21:56:13.343: E/AndroidRuntime(1475): at android.app.ActivityThread.main(ActivityThread.java:4424)
09-25 21:56:13.343: E/AndroidRuntime(1475): at java.lang.reflect.Method.invokeNative(Native Method)
09-25 21:56:13.343: E/AndroidRuntime(1475): at java.lang.reflect.Method.invoke(Method.java:511)
09-25 21:56:13.343: E/AndroidRuntime(1475): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:784)
09-25 21:56:13.343: E/AndroidRuntime(1475): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:551)
09-25 21:56:13.343: E/AndroidRuntime(1475): at dalvik.system.NativeStart.main(Native Method)
09-25 21:56:13.343: E/AndroidRuntime(1475): Caused by: android.os.NetworkOnMainThreadException
09-25 21:56:13.343: E/AndroidRuntime(1475): at android.os.StrictMode$AndroidBlockGuardPolicy.onNetwork(StrictMode.java:1099)
09-25 21:56:13.343: E/AndroidRuntime(1475): at java.net.InetAddress.lookupHostByName(InetAddress.java:391)
09-25 21:56:13.343: E/AndroidRuntime(1475): at java.net.InetAddress.getAllByNameImpl(InetAddress.java:242)
09-25 21:56:13.343: E/AndroidRuntime(1475): at java.net.InetAddress.getAllByName(InetAddress.java:220)
09-25 21:56:13.343: E/AndroidRuntime(1475): at org.apache.http.impl.conn.DefaultClientConnectionOperator.openConnection(DefaultClientConnectionOperator.java:137)
09-25 21:56:13.343: E/AndroidRuntime(1475): at org.apache.http.impl.conn.AbstractPoolEntry.open(AbstractPoolEntry.java:164)
09-25 21:56:13.343: E/AndroidRuntime(1475): at org.apache.http.impl.conn.AbstractPooledConnAdapter.open(AbstractPooledConnAdapter.java:119)
09-25 21:56:13.343: E/AndroidRuntime(1475): at org.apache.http.impl.client.DefaultRequestDirector.execute(DefaultRequestDirector.java:360)
09-25 21:56:13.343: E/AndroidRuntime(1475): at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:555)
09-25 21:56:13.343: E/AndroidRuntime(1475): at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:487)
09-25 21:56:13.343: E/AndroidRuntime(1475): at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:465)
09-25 21:56:13.343: E/AndroidRuntime(1475): at com.example.json.pwd.JSONParser.getJSONFromUrl(JSONParser.java:38)
09-25 21:56:13.343: E/AndroidRuntime(1475): at com.example.json.pwd.AndroidJSONParsingActivity.onCreate(AndroidJSONParsingActivity.java:54)
09-25 21:56:13.343: E/AndroidRuntime(1475): at android.app.Activity.performCreate(Activity.java:4465)
09-25 21:56:13.343: E/AndroidRuntime(1475): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1049)
09-25 21:56:13.343: E/AndroidRuntime(1475): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1920)
09-25 21:56:13.343: E/AndroidRuntime(1475): ... 11 more
09-25 21:56:21.553: I/dalvikvm(1475): threadid=3: reacting to signal 3
09-25 21:56:21.563: I/dalvikvm(1475): Wrote stack traces to '/data/anr/traces.txt'
答案 0 :(得分：1)
应该是因为在Android 3.0版本之后实现严格模式，任何时候都需要在网络调用之类的实现，数据库实现需要在Asynctask或线程中调用..