How to show toast according to the JSONObject response

问题

I am doing an application in which I'm using username and password for log in, if log in is successful I'm getting user_id and all, but when invalid user try to log in, will have to show toast message to the user. I'm getting {"error":"invalid_grant"} as my JSONresponse and I'm able to get JSONObject in a string.

JSONObject jObject = new JSONObject(result);
String aJsonString = jObject.getString("error");

Here aJsonString have the value of error in it.

Now, my question is: How to show an error message when invalid user tries to log in? And, if the user is valid pass the user to postExecute() method for further action.

回答1:

JSONObject jObject;

    try {
        jObject = new JSONObject(sampledata);
        if (jObject.has("error")) {
String aJsonString = jObject.getString("error");
Toast.makeText(ActivityName.this, aJsonString, Toast.LENGTH_LONG).show();
        } else {
    Toast.makeText(ActivityName.this, "Login Successful", Toast.LENGTH_LONG).show();
        }
    } catch (JSONException e1) {
        // TODO Auto-generated catch block
        e1.printStackTrace();
    }

来源：https://stackoverflow.com/questions/15198309/how-to-show-toast-according-to-the-jsonobject-response