我是android开发的初学者，并尝试使用listView制作和应用程序，显示JSON的字符串值。
以下是我的代码的一部分：
String jsonResult = "";
int animal_id = 0;
String ani_name = "asd", sci_name = "fgh";
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_bestiary);
.
.
.
listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
public void onItemClick(AdapterView<?> parent, View view, final int position, long id) {
for (int i = 0; i < 10; i++) {
if (position == i) {
Thread t = new Thread(new Runnable() {
@Override
public void run() {
Looper.prepare();
uploadToServer();
Log.d(TAG, "my thread works");
Log.d(TAG, jsonResult);
testReceiveData(jsonResult, position); //It said position needs to be declared final above
Log.d(TAG, "maybe this one works too");
Log.d(TAG, ani_name);
}
});
Log.d(TAG, "thread get started");
}
Intent intent = new Intent(BestiaryActivity.this, BestiaryDetailActivity.class);
Bundle bundle = new Bundle();
bundle.putString("aniString", ani_name);
bundle.putString("sciString", sci_name);
intent.putExtras(bundle);
startActivity(intent);
}
}
});
}
public void testReceiveData(String jsonResult, int position) {
try {
JSONArray arr = new JSONArray(jsonResult);
JSONObject jsonObj = arr.getJSONObject(position);
String animalName = jsonObj.getString("name");
String scienceName = jsonObj.getString("sci_name");
Log.d(TAG, "It gets JSONObject");
ani_name = animalName;
sci_name = scienceName;
Log.d(TAG, "Convert them");
} catch (JSONException e) {
e.printStackTrace();
}
}
@SuppressWarnings("deprecation")
public boolean uploadToServer() {
try {
String responseString = null;
DefaultHttpClient httpclient = new DefaultHttpClient();
HttpPost httpPost = new HttpPost(urlServer);
List<NameValuePair> nameValuePairs = new ArrayList<NameValuePair>();
nameValuePairs.add(new BasicNameValuePair("aniName", Integer.toString(aniNumber)));
httpPost.setEntity(new UrlEncodedFormEntity(nameValuePairs));
HttpResponse response = httpclient.execute(httpPost);
Log.d(TAG, "amHere");
HttpEntity result = response.getEntity();
if (result != null) {
InputStream input = result.getContent();
String resultString = convertStreamToString(input);
Log.d(TAG, resultString);
jsonResult = resultString;
Log.d(TAG, "jesonResult works");
} else {
Log.d(TAG, "broke in repsonse");
}
} catch (Exception e) {
e.printStackTrace();
}
return true;
}
然后我的JSON文件如下所示：
物种：{“animal_id”：“1”，“name”：“American Robin”，“sci_name”：“Turdus migratorius”}
我的期望是ani_name更改为American Robin并将sci_name更改为Turdus migratorius，因此我的下一个活动显示此值，但ani_name仍为asd且sci_name为fgh。
我检查了Log.d（TAG，jsonResult）;有JSON
我可以问你我做错了什么以及如何解决它？
哦，这些来自logcat
07-27 01:49:12.435 6867-6867/com.example.kange1.bert I/art﹕ Late-enabling -Xcheck:jni
07-27 01:49:12.639 6867-6885/com.example.kange1.bert D/OpenGLRenderer﹕ Use EGL_SWAP_BEHAVIOR_PRESERVED: true
07-27 01:49:12.646 6867-6867/com.example.kange1.bert D/Atlas﹕ Validating map...
07-27 01:49:12.669 6867-6885/com.example.kange1.bert I/Adreno-EGL﹕ <qeglDrvAPI_eglInitialize:379>: QUALCOMM Build: 01/15/15, ab0075f, Id3510ff6dc
07-27 01:49:12.670 6867-6885/com.example.kange1.bert I/OpenGLRenderer﹕ Initialized EGL, version 1.4
07-27 01:49:12.694 6867-6885/com.example.kange1.bert D/OpenGLRenderer﹕ Enabling debug mode 0
07-27 01:49:18.890 6867-6867/com.example.kange1.bert D/BestiaryActivity﹕ thread get started
07-27 01:49:18.958 6867-6867/com.example.kange1.bert D/AndroidRuntime﹕ Shutting down VM
07-27 01:49:18.959 6867-6867/com.example.kange1.bert E/AndroidRuntime﹕ FATAL EXCEPTION: main
Process: com.example.kange1.bert, PID: 6867
java.lang.ArrayIndexOutOfBoundsException: length=9; index=9
at com.example.kange1.bert.BestiaryActivity$1.onItemClick(BestiaryActivity.java:216)
at android.widget.AdapterView.performItemClick(AdapterView.java:305)
at android.widget.AbsListView.performItemClick(AbsListView.java:1146)
at android.widget.AbsListView$PerformClick.run(AbsListView.java:3053)
at android.widget.AbsListView$3.run(AbsListView.java:3860)
at android.os.Handler.handleCallback(Handler.java:739)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:135)
at android.app.ActivityThread.main(ActivityThread.java:5254)
at java.lang.reflect.Method.invoke(Native Method)
at java.lang.reflect.Method.invoke(Method.java:372)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:903)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:698)
07-27 01:49:18.981 6867-7152/com.example.kange1.bert D/BestiaryActivity﹕ amHere
07-27 01:49:18.982 6867-7152/com.example.kange1.bert D/BestiaryActivity﹕ Species : {"animal_id":"1","name":"American Robin","sci_name":"Turdus migratorius"}
07-27 01:49:18.982 6867-7152/com.example.kange1.bert D/BestiaryActivity﹕ jesonResult works
07-27 01:49:18.982 6867-7152/com.example.kange1.bert D/BestiaryActivity﹕ my thread works
07-27 01:49:18.982 6867-7152/com.example.kange1.bert D/BestiaryActivity﹕ Species : {"animal_id":"1","name":"American Robin","sci_name":"Turdus migratorius"}
07-27 01:49:18.982 6867-7152/com.example.kange1.bert W/System.err﹕ org.json.JSONException: Value Species of type java.lang.String cannot be converted to JSONArray
07-27 01:49:18.982 6867-7152/com.example.kange1.bert W/System.err﹕ at org.json.JSON.typeMismatch(JSON.java:111)
07-27 01:49:18.983 6867-7152/com.example.kange1.bert W/System.err﹕ at org.json.JSONArray.<init>(JSONArray.java:96)
07-27 01:49:18.983 6867-7152/com.example.kange1.bert W/System.err﹕ at org.json.JSONArray.<init>(JSONArray.java:108)
07-27 01:49:18.983 6867-7152/com.example.kange1.bert W/System.err﹕ at com.example.kange1.bert.BestiaryActivity.testReceiveData(BestiaryActivity.java:262)
07-27 01:49:18.983 6867-7152/com.example.kange1.bert W/System.err﹕ at com.example.kange1.bert.BestiaryActivity$1$1.run(BestiaryActivity.java:161)
07-27 01:49:18.983 6867-7152/com.example.kange1.bert W/System.err﹕ at java.lang.Thread.run(Thread.java:818)
07-27 01:49:18.983 6867-7152/com.example.kange1.bert D/BestiaryActivity﹕ maybe this one works too
07-27 01:49:18.983 6867-7152/com.example.kange1.bert D/BestiaryActivity﹕ asd
答案 0 :(得分：1)
使用json对象类的getString（）方法。 例： 格式：
{
"name":"john",
"country":"India"
}
现在，如果您想获取名称
的值JSONObject jsonObj = new JSONObject(formatStr);
String nameStr = jsonObj.getString("name");
答案 1 :(得分：0)
请参阅以下代码中的评论：
public void testReceiveData(String jsonResult, int position) {
try {
JSONArray arr = new JSONArray(jsonResult); // jsonResult is a jaon object and you are decoding it in JSONArray. See exception carefully.
// You code is actually written to parse a JSONArray so i think you should make it array.
JSONObject jsonObj = arr.getJSONObject(position);
String animalName = jsonObj.getString("name");
String scienceName = jsonObj.getString("sci_name");
Log.d(TAG, "It gets JSONObject");
ani_name = animalName;
sci_name = scienceName;
Log.d(TAG, "Convert them");
} catch (JSONException e) {
e.printStackTrace();
}
}
您的代码正在解析JSONArray，因此您应该使jsonResult成为JSONArray，如：{"animal_id":"1", "name":"American Robin", "sci_name":"Turdus migratorius"}，但要跟踪位置变量，它不应该超出范围。
答案 2 :(得分：-1)
你不需要使用jsonarray。使用jsonobject并从JSON获取字符串值。
这是代码： jsonResult = {“animal_id”：“1”，“name”：“American Robin”，“sci_name”：“Turdus migratorius”}
public void testReceiveData（String jsonResult，int position）{ 试试{
JSONObject jsonObj = new JSONObject(jsonResult);
String animalName = jsonObj.getString("name");
String scienceName = jsonObj.getString("sci_name");
Log.d(TAG, "It gets JSONObject");
ani_name = animalName;
sci_name = scienceName;
Log.d(TAG, "Convert them");
} catch (JSONException e) {
e.printStackTrace();
}
}