我无法显示以json响应形式传来的值。
我试图将这些值转换并在textView上显示，但失败了。
我的json响应如下：
{"calculate":{"persons":"148429","cost":25232.93}}
我的主要活动 Java 文件是：
import android.app.ProgressDialog;
import android.os.AsyncTask;
import android.support.v7.app.ActionBarActivity;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
public class MainActivity extends ActionBarActivity {
TextView uid;
TextView name1;
TextView email1;
Button Btngetdata;
//URL to get JSON Array
private static String url = "http://urls.p/GetData.php?";
//JSON Node Names
private static final String TAG_USER = "calculate";
//private static final String TAG_ID = "id";
private static final String TAG_NAME = "persons";
private static final String TAG_EMAIL = "cost";
JSONArray user = null;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Btngetdata = (Button)findViewById(R.id.getdata);
Btngetdata.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
new JSONParse().execute();
}
});
}
private class JSONParse extends AsyncTask<String, String, JSONObject> {
private ProgressDialog pDialog;
@Override
protected void onPreExecute() {
super.onPreExecute();
uid = (TextView)findViewById(R.id.uid);
name1 = (TextView)findViewById(R.id.name);
email1 = (TextView)findViewById(R.id.email);
pDialog = new ProgressDialog(MainActivity.this);
pDialog.setMessage("Getting Data ...");
pDialog.setIndeterminate(false);
pDialog.setCancelable(true);
pDialog.show();
}
@Override
protected JSONObject doInBackground(String... args) {
JSONParser jParser = new JSONParser();
// Getting JSON from URL
JSONObject json = jParser.getJSONFromUrl(url);
return json;
}
@Override
protected void onPostExecute(JSONObject json) {
pDialog.dismiss();
for (int i = 0; i < json.length(); i++) {
try {
//JSONObject c = json.getJSONObject(i);
// Getting JSON Array
JSONObject c = user.getJSONObject(i);
// Storing JSON item in a Variable
// String id = c.getString(TAG_ID);
//System.out.println();
String name = c.getString(TAG_NAME);
// System.out.println(name);
String email = c.getString(TAG_EMAIL);
//System.out.println(email);
//Set JSON Data in TextView
//uid.setText(id);
name1.setText(name);
email1.setText(email);
} catch (JSONException e) {
e.printStackTrace();
}
}
}
}
}
以及JSON解析器类：
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.HttpPost;
import org.apache.http.impl.client.DefaultHttpClient;
import org.json.JSONException;
import org.json.JSONObject;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.UnsupportedEncodingException;
/**
* Created by Admin on 09-04-2015.
*/
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;
}
}
activity_main.xml文件
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:orientation="vertical"
android:layout_height="match_parent"
android:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
tools:context=".MainActivity" >
<TextView
android:id="@+id/name"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="@+id/uid"
android:textAppearance="?android:attr/textAppearanceLarge"
android:textColor="#ff000000" />
<TextView
android:id="@+id/email"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="@+id/name"
android:textAppearance="?android:attr/textAppearanceLarge"
android:layout_alignRight="@+id/getdata"
android:layout_alignEnd="@+id/getdata"
android:textColor="#ff000000" />
<TextView
android:id="@+id/uid"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textAppearance="?android:attr/textAppearanceLarge"
android:layout_alignParentRight="true"
android:layout_alignParentEnd="true"
android:layout_alignParentTop="true"
android:textColor="#ff000000" />
<Button
android:id="@+id/getdata"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:layout_centerHorizontal="true"
android:layout_marginBottom="23dp"
android:text="Get Data"
android:layout_gravity="center_horizontal" />
</LinearLayout>
以下是logcat日志：
04-09 09:04:34.904 1170-1170/com.example.health.myapplication W/System.err﹕ org.json.JSONException: Value {"cost":25232.93,"persons":"148429"} at calculate of type org.json.JSONObject cannot be converted to JSONArray