[英]Android: IllegalStateException thrown
在LoginActivity.java類中,當用戶單擊注冊按鈕時,代碼將登錄會話設置為true,然后將活動從LoginActivity切換到MainActivity。 這是登錄代碼片段。
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;
這是用於處理登錄過程的LoginManager.java文件。 我使用OkHttp作為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,它顯示歡迎祝酒消息,並突然退出並顯示以下錯誤日志。
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方法下的try-catch短語出現錯誤。
try {
jsonObject = new JSONObject(response.body().string());
error = jsonObject.getBoolean("error");
} catch(JSONException e) {
e.printStackTrace();
}
我想問您如何修復代碼,以便不再捕獲IllegalStateException。
先感謝您。
作為一個普遍的答案,是:避免RuntimeException的正確方法是修復代碼:在正常情況下,它們不應被程序捕獲。
現在,讓我們看一下您的情況... IllegalStateException
出現是因為嘗試使用HttpConnection時似乎已將其關閉。 可能是因為您兩次調用了response.body()
方法?
當您在錯誤的時間調用方法時,拋出IllegalState異常。 檢查流程的性質,然后重組代碼以在適當的時候進行調用
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