目前，我的代码有问题。错误显示如下
Value br of type java.lang.String cannot be converted to JSONObject
我试图找出我的 PHP 端是否存在问题，但我也不知道如何追踪问题。
因此，我是否可以知道如何使用log 以及我需要将log 放在我的代码中的什么位置？
我希望有人能帮我解决这个问题。谢谢
下面是我当前的代码
public class MainActivity extends AppCompatActivity {
EditText etBadgeid, etPassword;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
etBadgeid = findViewById(R.id.etBadgeid);
etPassword = findViewById(R.id.etPassword);
findViewById(R.id.btnLogin).setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
userLogin();
}
});
}
private void userLogin() {
final String badgeid = etBadgeid.getText().toString();
final String pwd = etPassword.getText().toString();
class UserLogin extends AsyncTask<Void, Void, String> {
@Override
protected void onPreExecute() {
super.onPreExecute();
}
@Override
protected void onPostExecute(String s) {
super.onPostExecute(s);
try {
//converting response to json object
JSONObject obj = new JSONObject(s);
//if no error in response
if (!obj.getBoolean("error")) {
Toast.makeText(getApplicationContext(), obj.getString("message"), Toast.LENGTH_SHORT).show();
//getting the user from the response
JSONObject userJson = obj.getJSONObject("user");
//creating a new user object
User user = new User(
userJson.getString("badgeid"),
userJson.getString("email"),
userJson.getString("fullname"),
userJson.getInt("roles_id"),
userJson.getInt("team_id")
);
//storing the user in shared preferences
SharedPrefManager.getInstance(getApplicationContext()).userLogin(user);
//starting the profile activity
finish();
startActivity(new Intent(getApplicationContext(), Home.class));
} else {
Toast.makeText(getApplicationContext(), "Invalid username or password", Toast.LENGTH_SHORT).show();
}
} catch (JSONException e) {
e.printStackTrace();
}
}
@Override
protected String doInBackground(Void... voids) {
//creating request handler object
RequestHandler requestHandler = new RequestHandler();
//creating request parameters
HashMap<String, String> params = new HashMap<>();
params.put("badgeid", badgeid);
params.put("pwd", pwd);
//returing the response
return requestHandler.sendPostRequest(URLs.URL_LOGIN, params);
}
}
UserLogin ul = new UserLogin();
ul.execute();
}
@Override
public void onBackPressed() {
finish();
System.exit(0);
}
}
最佳答案
在android中你可以使用Log.d(tag,message)登录，你可以在logcat中查看调试信息
你应该在解析响应字符串之前打印日志，
...
@Override
protected void onPostExecute(String s) {
super.onPostExecute(s);
Log.d("onPostExecute","response is: "+s);
try {
//converting response to json object
JSONObject obj = new JSONObject(s);
....
您的回复可能是非 json 格式的纯文本。
关于java - 安卓工作室/JAVA : How to trace error at android studio using "log"，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/59297010/