How to Fix \'Value of type java.lang.String cannot be converted to JSONObject\' Error in Android?

Troubleshooting a "Value u003cbru003e of type java.lang.String cannot be converted to JSONObject" Error

In your Android application, you're encountering an error related to JSON parsing. Specifically, you're seeing the following exception:

<code class="java">org.json.JSONException: Value 

<br of type java.lang.String cannot be converted to JSONObject</code>

This error indicates that you're attempting to parse a non-JSON string as JSON. Here's how you can troubleshoot this issue:

1. Check your server response: The request to your PHP script may be failing or returning a non-JSON response. Add a Log.i("tagconvertstr", "[" result "]"); line before the JSONObject call in your Android code to print out the actual response.
2. Debug using a break point: If you're using Eclipse, you can set a break point in your code and step through it to see what's happening. This will allow you to inspect the values and identify the cause of the error.
3. Revisit your PHP script: Ensure that your PHP script is properly handling the data and returning a valid JSON string. Verify that the data is being received correctly on the Android side.

Here's an example of how you can troubleshoot the error:

<code class="java">Log.i("tagconvertstr", "["+result+"]");
try {
    JSONObject jObj = new JSONObject(result);

    donnees = jObj.getString("message");
} catch (JSONException e) {
    Log.i("tagjsonexp", "" + e.toString());
} catch (ParseException e) {
    Log.i("tagjsonpars", "" + e.toString());
}</code>

By adding the Log.i("tagconvertstr", "[" result "]"); line, you can inspect the value of result and identify the cause of the error. Additionally, stepping through your code will help you pinpoint the issue and resolve it.

The above is the detailed content of How to Fix \'Value of type java.lang.String cannot be converted to JSONObject\' Error in Android?. For more information, please follow other related articles on the PHP Chinese website!