Question

我正在创建登录应用程序，在android studio中使用php，我的问题是如何使应用程序保持在线状态。

即

当我使用用户名和密码登录应用程序时，应用程序会在我关闭应用程序时登录。它被注销，但我需要在关闭应用程序时保持应用程序登录。还

任何人都可以建议如何做到这一点吗？

这是我的第一个主要活动（登录活动）

import android.app.Activity;
import android.content.Context;
import android.content.Intent;
import android.content.SharedPreferences;
import android.net.Uri;
import android.os.AsyncTask;
import android.preference.PreferenceManager;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.EditText;
import android.widget.Toast;
import org.json.JSONException;
import org.json.JSONObject;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URL;


public class MainActivity extends Activity {

    EditText name, password;
    String Name, Password;
    Context ctx=this;
    String NAME=null, PASSWORD=null, EMAIL=null;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        name = (EditText) findViewById(R.id.main_name);
        password = (EditText) findViewById(R.id.main_password);
    }


    public void main_login(View v){
        Name = name.getText().toString();
        Password = password.getText().toString();
        BackGround b = new BackGround();
        b.execute(Name, Password);
    }

    class BackGround extends AsyncTask<String, String, String> {

        @Override
        protected String doInBackground(String... params) {
            String name = params[0];
            String password = params[1];
            String data="";
            int tmp;

            try {
                URL url = new URL("http://localhost/sample/Login%20php/login.php");
                String urlParams = "name="+name+"&password="+password;

                HttpURLConnection httpURLConnection = (HttpURLConnection) url.openConnection();
                httpURLConnection.setDoOutput(true);
                OutputStream os = httpURLConnection.getOutputStream();
                os.write(urlParams.getBytes());
                os.flush();
                os.close();

                InputStream is = httpURLConnection.getInputStream();
                while((tmp=is.read())!=-1){
                    data+= (char)tmp;
                }

                is.close();
                httpURLConnection.disconnect();

                return data;
            } catch (MalformedURLException e) {
                e.printStackTrace();
                return "Exception: "+e.getMessage();
            } catch (IOException e) {
                e.printStackTrace();
                return "Exception: "+e.getMessage();
            }
        }

        @Override
        protected void onPostExecute(String result) {

            if(result.equals("Matches")) {

               // Intent intent=new Intent(Intent.ACTION_VIEW);
                //intent.setData(Uri.parse("content://com.android.calendar/time/"));
                //startActivity(intent);

                Boolean Registered; final SharedPreferences sharedPref = PreferenceManager.getDefaultSharedPreferences(MainActivity.this);
                Registered = sharedPref.getBoolean("Registered", false);
                if (!Registered)
                {
                        startActivity(new Intent(MainActivity.this,MainActivity.class));
                }else
                    { startActivity(new Intent(MainActivity.this,Main2Activity.class));
                    }
            }

            if(result.equals("No match")) {

                Toast.makeText(MainActivity.this, "USERNAME/PASSWORD IS INCORRECT", Toast.LENGTH_LONG).show();
            }

        }
    }
}

第二项活动

    package com.example.myapplication;

import android.content.SharedPreferences;
import android.os.Bundle;
import android.preference.PreferenceManager;
import android.support.design.widget.FloatingActionButton;
import android.support.design.widget.Snackbar;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.Toolbar;
import android.view.View;

public class Main2Activity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main2);
        Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
        setSupportActionBar(toolbar);


        final SharedPreferences sharedPref = PreferenceManager.getDefaultSharedPreferences(this);
        SharedPreferences.Editor editor = sharedPref.edit(); editor.putBoolean("Registered", true);
        editor.apply();


    }

}

Answer 1

在MainActivity的onPostExecute中

        @Override
            protected void onPostExecute(String result) {

                if(result.equals("Matches")) {

    startActivity(new Intent(MainActivity.this,Main2Activity.class)); 
  finish();              
                }

                if(result.equals("No match")) {

                    Toast.makeText(MainActivity.this, "USERNAME/PASSWORD IS INCORRECT", Toast.LENGTH_LONG).show();
                }

            }
        }

创建启动画面并在清单

中设置启动器活动

public class Splash extends Activity {

// Splash screen timer
private static int SPLASH_TIME_OUT = 3000;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);


    new Handler().postDelayed(new Runnable() {

        /*
         * Showing splash screen with a timer. This will be useful when you
         * want to show case your app logo / company
         */

        @Override
        public void run() {
            // This method will be executed once the timer is over
            // Start your app main activity
            Boolean Registered;
            final SharedPreferences sharedPref = PreferenceManager.getDefaultSharedPreferences(Splash.this);
            Registered = sharedPref.getBoolean("Registered", false);

            if (!Registered)
            {
                startActivity(new Intent(Splash.this,MainActivity.class));
            }else {
                startActivity(new Intent(Splash.this,SecondAcivity.class));
            }

            // close this activity
            finish();
        }
    }, SPLASH_TIME_OUT);
}

}

您的Main2Activity活动是正确的

如何在线保持登录应用程序永远直到应用程序。是卸载？

1 个答案: