Android Studio中从JSONObject提取‘ok’字符串的方法求助

Hey there! Let's work through this together—glad you already got the server response working in your Android Studio 3 emulator, that's half the battle done!

First, let's clarify a key point: you need to know exactly what your server's response looks like before extracting the "ok" string. Let's break down the two most common scenarios and the code for each:

1. If the server returns plain text "ok" #

If the response is just the raw string "ok" (not wrapped in a JSON object), you can directly convert the response body to a string and check it:

// Example with OkHttp (adjust if you're using HttpURLConnection)
try {
    Response response = client.newCall(request).execute();
    if (response.isSuccessful()) {
        String responseBody = response.body().string().trim(); // Trim whitespace just in case
        
        if ("ok".equals(responseBody)) {
            // You've got your "ok" string here!
            Log.d("TAG", "Extracted string: " + responseBody);
        } else {
            Log.d("TAG", "Response wasn't 'ok': " + responseBody);
        }
    }
} catch (IOException e) {
    e.printStackTrace();
}

2. If the server returns a JSON object with an "ok" field #

If the response is a JSON object like {"status": "ok"} (or any other key that holds the "ok" value), use Android's built-in org.json library to parse it:

try {
    Response response = client.newCall(request).execute();
    if (response.isSuccessful()) {
        String responseBody = response.body().string();
        JSONObject jsonResponse = new JSONObject(responseBody);
        
        // Replace "status" with the actual key from your JSON
        String targetString = jsonResponse.getString("status");
        
        if ("ok".equals(targetString)) {
            Log.d("TAG", "Found 'ok'!");
        } else {
            Log.d("TAG", "Got: " + targetString);
        }
    }
} catch (IOException | JSONException e) {
    e.printStackTrace();
    // Handle network or parsing errors here
}

Quick Troubleshooting Tips #

• Print the full response first: Add Log.d("TAG", "Full response: " + responseBody); right after getting the response string. This will show you exactly what you're working with—no more guessing!
• Watch for case sensitivity: JSON keys and string values are case-sensitive. Make sure you're checking for "ok" (all lowercase) and not "Ok" or "OK".
• Handle nulls: If the JSON field might be missing, use jsonResponse.optString("status") instead of getString()—it returns an empty string if the key doesn't exist, avoiding a JSONException.

内容的提问来源于stack exchange，提问作者Vit