php android微调 - JSONObject不能转换为JSONArray

Question

我是一个初学者在java编程，我想加载一个微调的php结果，我一直有这个问题的JSONObject不能转换为JSONArray。我有网站上的搜索尝试和转换，但我似乎无法修复它。

PHP结果：

{"ref_product_types":[{"product_type_code":"1","product_type_description":"Mobile Phone"},{"product_type_code":"2","product_type_description":"Toys"}]} 

我已经在清单

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

这里添加这是Java代码：

package com.example.spinnert1; 

public class Main extends Activity { 

InputStream is=null; 
String result=null; 
String line=null; 

String[] product_type_code, product_type_description; 

Spinner spinner1,spinner2; 



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

spinner1 = (Spinner) findViewById(R.id.spinner1); 
spinner2 = (Spinner) findViewById(R.id.spinner2); 
final List<String> list1 = new ArrayList<String>(); 
final List<String> list2 = new ArrayList<String>(); 

Button b=(Button) findViewById(R.id.button1); 

b.setOnClickListener(new View.OnClickListener() { 

@Override 
public void onClick(View v) 
{ 
       // TODO Auto-generated method stub 

try 
{ 
HttpClient httpclient = new DefaultHttpClient(); 
HttpPost httppost = new HttpPost("http://10.0.2.2/epos_connect/get_all_product_type.php"); 
HttpResponse response = httpclient.execute(httppost); 
Log.e("Fail 1", "3"); 

HttpEntity entity = response.getEntity(); 
Log.e("Fail 1", "4"); 

is = entity.getContent(); 
Log.e("Pass 1", "connection success "); 
} 
catch(Exception e) 
{ 
Log.e("Fail 1", e.toString()); 
Toast.makeText(getApplicationContext(), "Invalid IP Address",Toast.LENGTH_LONG).show(); 
finish(); 
}  


try 
{ 
BufferedReader reader = new BufferedReader(new InputStreamReader(is,"iso-8859-1"),8); 
StringBuilder sb = new StringBuilder(); 
while ((line = reader.readLine()) != null) 
{ 
sb.append(line + "\n"); 
} 
is.close(); 
result = sb.toString(); 
} 
catch(Exception e) 
{ 
Log.e("Fail 2", e.toString()); 
}  


try 
{ 
JSONArray JA=new JSONArray(result); 


JSONObject json= null; 
product_type_code = new String[JA.length()];  
product_type_description = new String[JA.length()]; 

for(int i=0;i<JA.length();i++) 
{ 
json=JA.getJSONObject(i); 
product_type_code[i] = json.getString("product_type_code"); 
product_type_description[i]=json.getString("product_type_description"); 
} 
Toast.makeText(getApplicationContext(), "sss",Toast.LENGTH_LONG).show(); 

for(int i=0;i<product_type_code.length;i++) 
{ 
list1.add(product_type_code[i]); 
list2.add(product_type_description[i]); 
} 

spinner_fn(); 

} 
catch(Exception e) 
{ 

Log.e("Fail 3", e.toString()); 
//login.this.finish(); 

} 
} 
}); 

} 
private void spinner_fn() { 
    // TODO Auto-generated method stub 

    ArrayAdapter<String> dataAdapter1 = new ArrayAdapter<String>(getApplicationContext(), 
            android.R.layout.simple_spinner_item, product_type_code); 
    dataAdapter1.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item); 
    spinner1.setAdapter(dataAdapter1); 


    ArrayAdapter<String> dataAdapter2 = new ArrayAdapter<String>(getApplicationContext(), 
            android.R.layout.simple_spinner_item, product_type_description); 
    dataAdapter2.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item); 
    spinner2.setAdapter(dataAdapter2); 


    spinner1.setOnItemSelectedListener(new OnItemSelectedListener() 
    { 
    @Override 
    public void onItemSelected(AdapterView<?> arg0, View arg1,int position, long id) 
    { 
    // TODO Auto-generated method stub 

    spinner2.setSelection(position); 

    } 

    @Override 
    public void onNothingSelected(AdapterView<?> arg0) 
    { 
    // TODO Auto-generated method stub 
    } 

    }); 


    spinner2.setOnItemSelectedListener(new OnItemSelectedListener() { 

    @Override 
    public void onItemSelected(AdapterView<?> arg0, View arg1,int position, long arg3) { 
    // TODO Auto-generated method stub 

    spinner1.setSelection(position); 

    } 

    @Override 
    public void onNothingSelected(AdapterView<?> arg0) { 
    // TODO Auto-generated method stub 
    } 
    }); 

    } 

    @Override 
    public boolean onCreateOptionsMenu(Menu menu) { 
    getMenuInflater().inflate(R.menu.main, menu); 
    return true; 
    } 

    } 

布局XML

<?xml version="1.0" encoding="utf-8"?> 
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" 
android:layout_width="fill_parent" 
android:layout_height="fill_parent" 
android:orientation="vertical" > 

<Spinner 
    android:id="@+id/spinner1" 
    android:layout_width="match_parent" 
    android:layout_height="wrap_content" 
    android:entries="@array/country_arrays" 
    android:prompt="@string/country_prompt" /> 

<Spinner 
    android:id="@+id/spinner2" 
    android:layout_width="match_parent" 
    android:layout_height="wrap_content" /> 

<Button 
    android:id="@+id/btnSubmit" 
    android:layout_width="wrap_content" 
    android:layout_height="wrap_content" 
    android:text="Submit" /> 

</LinearLayout> 

谢谢

Answer 1

它看起来像返回的数据确实是一个JSON对象，而不是一个JSON数组; JSON数组嵌套在外部对象中的“ref_product_types”键中。

你要使用这样的：

JSONObject jsonObj = new JSONObject(result); 
JSONArray ja = jsonObj.getJSONArray("ref_product_types") 

Answer 2

{ 
    "ref_product_types": [ 
          {"product_type_code":"1", 
          "product_type_description":"Mobile Phone" 
          }, 
          {"product_type_code":"2", 
          "product_type_description":"Toys" 
          } 
         ] 
} 

所以我做了一些格式，以您看清楚了。

所以刚开始你应该知道，多集括号{表示的JSONObject和支架[表示JSONArray。所以你的String提供了JSONObject，它存储了JSONArray。所以你需要首先创建新的JSONObject，然后解析JSONArray。

JSONObject o = new JSONObject(sourceString); 
JSONArray arr = o.getJSONArray("ref_product_types");