正在注销应用程序

Question

我正在尝试在我的android应用程序中实现注销方法并编写以下代码。Main Activity是登录活动，ChoosingProcActivity是包含注销按钮的活动。当我按下注销按钮时，它会将我移动到主活动，但当我下次打开应用程序时，它直接将我移动至ChoosingProcActivity。此外，当我成功登录，然后返回或按返回时，它会显示Main Activity(login(。我该如何避免这种情况？共享偏好是错误的吗？

Main Activity code

package com.example.lenovo.tactic;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.content.Context;
import android.content.Intent;
import android.content.SharedPreferences;
import android.os.Vibrator;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.text.TextUtils;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
import android.widget.Toast;
import com.android.volley.AuthFailureError;
import com.android.volley.Request;
import com.android.volley.RequestQueue;
import com.android.volley.Response;
import com.android.volley.VolleyError;
import com.android.volley.toolbox.StringRequest;
import com.android.volley.toolbox.Volley;
import org.json.JSONException;
import org.json.JSONObject;
import java.util.HashMap;
import java.util.Map;
import java.util.concurrent.ExecutionException;

public class MainActivity extends AppCompatActivity {
EditText email_input,password_input;
TextView reset;
Button btnLogin;
Boolean isLogedBefore = false;
Vibrator v;
String organizer_ID;
SharedPreferences test_name;
final String loginURL = "http://tactickevent.com/phpApp/loginApp.php";

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
email_input = findViewById(R.id.etUserName);
password_input = findViewById(R.id.etPassword);
btnLogin = findViewById(R.id.btnLogin);
test_name = getSharedPreferences("NAME", Context.MODE_PRIVATE);
test_name.getString("email", "");
test_name.getString("organizer_ID", "");
// if(isLogedBefore == true){
boolean is = test_name.getBoolean("isLoged", false);
if (is==true) {
Intent intent = new Intent(MainActivity.this, ChoosingProcActivity.class);
startActivity(intent);
// }
}
v = (Vibrator) getSystemService(Context.VIBRATOR_SERVICE);
btnLogin.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
validateUserData();
}
});

}
private void validateUserData() {
//first getting the values
final String email = email_input.getText().toString();
final String password = password_input.getText().toString();
//checking if email is empty
if (TextUtils.isEmpty(email)) {
email_input.setError("أدخل البريد الالكتروني من فضلك");
email_input.requestFocus();
// Vibrate for 100 milliseconds
v.vibrate(100);
btnLogin.setEnabled(true);
return;
}
//checking if password is empty
if (TextUtils.isEmpty(password)) {
password_input.setError("أدخل كلمة السر من فضلك");
password_input.requestFocus();
//Vibrate for 100 milliseconds
v.vibrate(100);
btnLogin.setEnabled(true);
return;
}
//validating email
if (!android.util.Patterns.EMAIL_ADDRESS.matcher(email).matches()) {
email_input.setError("أدخل بريد الكتروني صحيح");
email_input.requestFocus();
//Vibrate for 100 milliseconds
v.vibrate(100);
btnLogin.setEnabled(true);
return;
}

//Login User if everything is fine
//first getting the values
//String emaill = email_input.getText().toString();
// String passwordd = password_input.getText().toString();
loginUser(email,password);

}
private void loginUser(final String email,final String password) {

RequestQueue queue = Volley.newRequestQueue(this);
//Call our volley library
StringRequest stringRequest = new StringRequest(Request.Method.POST,loginURL,
new Response.Listener<String>() {
@Override
public void onResponse(String response) {
try {
//                            Toast.makeText(getApplicationContext(),response.toString(), Toast.LENGTH_SHORT).show();
JSONObject obj = new JSONObject(response);
if (obj.getInt("value")== 1) {
organizer_ID = obj.getString("organizer_ID");
//storing the user in shared preferences
//SharedPref.getInstance(getApplicationContext()).storeID(organizer_ID);
//starting the ChoosingProcActivity
SharedPreferences.Editor editor = test_name.edit();
editor.putBoolean("isLoged",true);
editor.putString("email", email);
editor.putString("organizer_ID", organizer_ID);
//apply
editor.commit();
Toast.makeText(getApplicationContext(), "تم تسجيل الدخول بنجاح", Toast.LENGTH_SHORT).show();
startActivity(new Intent(getApplicationContext(), ChoosingProcActivity.class));
//finish();
//  startActivity(new Intent(getApplicationContext(), ChoosingProcActivity.class));
} else{
Toast.makeText(getApplicationContext(),"هناك خطأ في كلمة السر أو البريد الالكتروني ", Toast.LENGTH_SHORT).show();
//getting user name
//Toast.makeText(getApplicationContext(), obj.getString("messagee"), Toast.LENGTH_SHORT).show();
//storing the user in shared preferences
//SharedPref.getInstance(getApplicationContext()).storeUserName(organizer_ID);
//starting the profile activity
//finish();
//startActivity(new Intent(getApplicationContext(), ChoosingProcActivity.class));
}

} catch (JSONException e) {
e.printStackTrace();
}
}
},
new Response.ErrorListener() {
@Override
public void onErrorResponse(VolleyError error) {
Toast.makeText(getApplicationContext(),"Connection Error"+error, Toast.LENGTH_SHORT).show();
error.printStackTrace();
}
}) {
//email key mean the value that will send to php in $_POST["email"];
//password key mean the value that will send to php in $_POST["password"];
@Override
protected Map<String, String> getParams() throws AuthFailureError {
Map<String, String> params = new HashMap<>();
params.put("email", email);
params.put("password", password);
return params;
}
};
queue.add(stringRequest);

/*
String type = "login";
BackgroundWorker backgroundWorker = new BackgroundWorker(this);
backgroundWorker.execute(type, email, password);

try {
JSONObject jsonObject = new JSONObject(result1);
SharedPreferences.Editor editor = test_name.edit();
editor.putBoolean("isLoged",true);
editor.putString("email", email);
editor.putString("organizer_ID", jsonObject.getString("organizer_ID"));
//apply
editor.commit();
*/
}


}

第二个活动的代码

package com.example.lenovo.tactic;
import android.content.Context;
import android.content.Intent;
import android.content.SharedPreferences;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuInflater;
import android.view.MenuItem;
import android.view.View;
import android.widget.Button;
public class ChoosingProcActivity extends AppCompatActivity {
Button eventBTN, subeventBTN;
SharedPreferences test_name;
String emailToPass,organizer_ID;
SharedPreferences preferences;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_choosing_proc);
eventBTN= (Button)findViewById(R.id.BtnEvent);
subeventBTN= (Button)findViewById(R.id.BtnSubEvent);
test_name = getSharedPreferences("NAME", Context.MODE_PRIVATE);
emailToPass= test_name.getString("email", "");
organizer_ID= test_name.getString("organizer_ID", "");
eventBTN.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
Intent intent = new Intent(ChoosingProcActivity.this, EventProcActivity.class);
startActivity(intent);
}
});
subeventBTN.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
Intent intent = new Intent(ChoosingProcActivity.this, SubeventProcActivity.class);
startActivity(intent);
}
});
}
@Override
public boolean onCreateOptionsMenu(Menu menu){
MenuInflater menuInflater = getMenuInflater();
menuInflater.inflate(R.menu.main_menu, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item){
if(item.getItemId() ==R.id.logout)
{
preferences =getSharedPreferences("Name",Context.MODE_PRIVATE);
SharedPreferences.Editor editor = preferences.edit();
editor.clear();
editor.commit();
finish();

}
return true;
}
}

Answer 1

您可以在每次测试为true时完成活动，这样就不能再从堆栈访问它了。

boolean is = test_name.getBoolean("isLoged", false);
if (is) {
Intent intent = new Intent(MainActivity.this, ChoosingProcActivity.class);
startActivity(intent);
finish();
}

Answer 2

我假设您的MainActivity是打开应用程序时第一个启动的。在主活动中添加以下内容：

@Override
protected void onStart() {
super.onStart();
if (SharedPrefManager.getInstance(this).isLoggedIn()) {
Intent intent = new Intent(this, ChoosingProcActivity.class);
intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK | Intent.FLAG_ACTIVITY_CLEAR_TASK);
startActivity(intent);
finish();
}
}

在你的应用程序启动期间，它会询问是否有人已经登录，如果有，它会转到ChoosingProcActivity。我假设在您的SharedPrefManager实现中，您有一个代码来了解是否有登录用户。

在您的登录方法中，取消注释finish((方法

startActivity(new Intent(getApplicationContext(), ChoosingProcActivity.class));
//finish();

成功登录后，如果按下"上一步"按钮，将看不到MainActivity。

在你的ChoosingProcActivity中，它看起来像这样：

@Override
protected void onStart() {
super.onStart();
if (!SharedPrefManager.getInstance(this).isLoggedIn()) {
Intent intent = new Intent(this, MainActivity.class);
intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK | Intent.FLAG_ACTIVITY_CLEAR_TASK);
startActivity(intent);
finish();
}
}

基本上，它会询问是否有当前登录的用户。如果没有，它会返回到MainActivity。

编辑在注销时，您可以将此作为代码的基础

logoutComponent.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
SharedPrefManager.getInstance(getActivity()).clear();
Intent intent = new Intent(ChooseProcActivity.this, MainActivity.class);
intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK | Intent.FLAG_ACTIVITY_CLEAR_TASK);
startActivity(intent);
}
});