Question

每次我尝试打开应用程序时，都会说

"Unfortunately, (appName) has stopped."

我正在尝试解析一些json数据，并将其显示在“ram”textView中，但它无效。我做错了什么？

public class Index extends Activity {
TextView ram = (TextView) findViewById(R.id.RAM_Text);
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        // TODO Auto-generated method stub
        setContentView(R.layout.activity_main);
        super.onCreate(savedInstanceState);
        DefaultHttpClient   httpclient = new DefaultHttpClient(new BasicHttpParams());
        HttpPost httppost = new HttpPost("http://admin.isdata.dk/jscalls/dashboard.php?auth=215e82a271f225df31ce2c358ec26a49");
        httppost.setHeader("Content-type", "application/json");

        InputStream inputStream = null;
        String result = null;
        try {
            HttpResponse response = httpclient.execute(httppost);           
            HttpEntity entity = response.getEntity();

            inputStream = entity.getContent();
            BufferedReader reader = new BufferedReader(new InputStreamReader(inputStream, "UTF-8"), 8);
            StringBuilder sb = new StringBuilder();

            String line = null;
            while ((line = reader.readLine()) != null)
            {
                sb.append(line + "\n");
            }
            result = sb.toString();
        } catch (Exception e) { 
            e.printStackTrace();
        }
        finally {
            try{if(inputStream != null)inputStream.close();}catch(Exception squish){}
        }
        JSONObject jObject = null;
        try {
            jObject = new JSONObject(result);
        } catch (JSONException e1) {
            // TODO Auto-generated catch block
            e1.printStackTrace();
        }
        try {
            double aJsonDouble = jObject.getDouble("ram");
            String valueOfRam = String.valueOf(aJsonDouble);
            ram.setText(valueOfRam);

        } catch (JSONException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
    }



}

提前致谢！

Answer 1

更改为

TextView ram; 
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    ram = (TextView) findViewById(R.id.RAM_Text);

另外

HttpResponse response = httpclient.execute(httppost);

应该在Thread或Asynctask。

http://developer.android.com/reference/android/os/AsyncTask.html

所有与网络相关的操作都应在thread或Asynctask

上完成

为什么这个JSON解析器无法正常工作？

1 个答案: