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在LoginActivity.java類中，當用戶單擊註冊按鈕時，代碼將登錄會話設置爲true，然後將活動從LoginActivity切換到MainActivity。這是登錄代碼片段。Android：拋出IllegalStateException異常
case(R.id.login):
String email = etEmail.getText().toString();
String password = etPassword.getText().toString();
if(email.trim().length() > 0 && password.trim().length() > 0) {
loginManager.checkLogin(email, password);
pDialog.setMessage("Logging in..");
showDialog();
session.setLogin(true);
if(loginManager.isLoginSuccessful()) {
hideDialog();
Toast.makeText(this, getResources().getString(R.string.welcome_msg), Toast.LENGTH_LONG).show();
Intent intent = new Intent(this, MainActivity.class);
startActivity(intent);
overridePendingTransition(R.anim.slide_in_right, R.anim.slide_out_left);
finish();
} else {
Toast.makeText(this, loginManager.getErrorMessage(), Toast.LENGTH_LONG).show();
}
} else if(email.trim().length() < 1) {
Toast.makeText(this, "Please enter the email", Toast.LENGTH_SHORT).show();
} else {
Toast.makeText(this, "Please enter the password", Toast.LENGTH_SHORT).show();
}
break;
這裏是LoginManager.java文件，它處理登錄過程。我使用OkHttp作爲HTTP庫。
public class LoginManager {
private final String TAG_LOGIN = LoginManager.class.getSimpleName();
private OkHttpClient client = new OkHttpClient();
private final String loginURL = URL.getInstance().getUrlLogin();
private Request request = new Request.Builder().url(loginURL).build();
private static JSONObject jsonObject;
private boolean error;
public void checkLogin(final String email, final String password) {
client.newCall(request).enqueue(new Callback() {
// onFailure is called when the request could not be executed due to cancellation, a connectivity problem or timeout.
@Override
public void onFailure(Request request, IOException e) {
}
// onResponse is called when the HTTP response was successfully returned by the remote server.
// using POST request for login
@Override
public void onResponse(Response response) throws IOException {
Log.d(TAG_LOGIN, "Login response: " + response.body().string());
RequestBody body = new FormEncodingBuilder()
.add("tag", "login")
.add("email", email)
.add("password", password)
.build();
Request request = new Request.Builder().url(loginURL).post(body).build();
client.newCall(request).execute();
try {
jsonObject = new JSONObject(response.body().string());
error = jsonObject.getBoolean("error");
} catch(JSONException e) {
e.printStackTrace();
}
}
});
}
public boolean isLoginSuccessful() {
if(error) {
return false;
}
return true;
}
public String getErrorMessage() {
String errorMessage = null;
try {
jsonObject.getString("error_msg");
} catch(JSONException e) {
e.printStackTrace();
}
return errorMessage;
}
}
當我運行該應用程序時，它顯示歡迎Toast消息並突然退出並顯示以下錯誤日誌。
java.lang.IllegalStateException: closed
at com.squareup.okhttp.internal.http.HttpConnection$FixedLengthSource.read(HttpConnection.java:454)
at okio.Buffer.writeAll(Buffer.java:574)
at okio.RealBufferedSource.readByteArray(RealBufferedSource.java:87)
at com.squareup.okhttp.ResponseBody.bytes(ResponseBody.java:56)
at com.squareup.okhttp.ResponseBody.string(ResponseBody.java:82)
at com.marshall.thequizshow.application.http.LoginManager$1.onResponse(LoginManager.java:51)
at com.squareup.okhttp.Call$AsyncCall.execute(Call.java:150)
at com.squareup.okhttp.internal.NamedRunnable.run(NamedRunnable.java:33)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1112)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:587)
at java.lang.Thread.run(Thread.java:841)
因此，我必須在LoginManager.java文件中的onResponse方法下有一個try-catch短語的錯誤。
try {
jsonObject = new JSONObject(response.body().string());
error = jsonObject.getBoolean("error");
} catch(JSONException e) {
e.printStackTrace();
}
我想問你，我應該怎麼修復代碼，以便它不再惹人IllegalStateException異常。
預先感謝您。
你如何確定它正在捕獲異常？'IllegalStateException'不會被'JSONException' catch塊捕獲，因爲它們不是在父 - 子關係中。我認爲你得到的堆棧跟蹤是正常的，你可以在JSONException異常中放置一個記錄器，你會發現它沒有被記錄，這意味着它已經不是捕捉..如果你不使用IllegalStateException或RuntimeException或Exception，那麼IllegalStateException將不會被捕獲到任何catch塊。 – hagrawal