java - 当应用程序在前台运行时使用挂起 Intent 或其他解决方案从主菜单打开特定选项卡

Question

在我的应用程序中，首先有一个登录 Activity 和一个主页 Activity 。使用 volley 登录并将参数传递给 Intent 中的家庭 Activity 后，我可以启动一个前台服务，使应用程序保持在后台运行并带有通知，并通过在挂起的 Intent 的帮助下单击通知返回家庭 Activity 。

现在，我正在寻找如何从主菜单打开应用程序并通过前台服务的待处理 Intent 直接访问家庭 Activity 。也许我应该将待处理 Intent 的参数传递给登录 Activity 并检查它们以重定向到家庭 Activity ，但我坚持这一点并且不明白。

这是登录 Activity 页面:

    EditText username, password;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_login);
        Button login = (Button) findViewById(R.id.signIn);
        // Login On Button Click
        login.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
            login();}
        });
// THIS IS THE SOLUTION THAT I THOUGHT ABOUT : if the intent is not null open HomeActivity
        Intent startinIntent = getIntent();
        if (startinIntent.getStringExtra("userLogged") != null && !startinIntent.getStringExtra("userLogged").isEmpty()) {
           String userLogged = startinIntent.getStringExtra("userLogged");
           Intent startAgain = new Intent(this, HomeActivity.class);
           tackBackWork.putExtra("userLogged", userLogged);
           startActivity(startAgain);
            Log.d("this is the ilue", userLogged);
        }
    }
    private void login(){
        username = (EditText)findViewById(R.id.username);
        password = (EditText)findViewById(R.id.password);
            RequestQueue requestQueue = Volley.newRequestQueue(getApplicationContext());
            JSONObject object = new JSONObject();
            try {
                //input your API parameters
                object.put("u",username.getText());
                object.put("p",password.getText());
            } catch (JSONException e) {
                e.printStackTrace();
            }
            // Enter the correct url for your api service site
            String url = getResources().getString(R.string.loginUrl);
            JsonObjectRequest jsonObjectRequest = new JsonObjectRequest(Request.Method.POST, url, object,
                    new Response.Listener<JSONObject>() {
                        @Override
                        public void onResponse(JSONObject response) {
                            try{
                                String msg = response.getString("msg");
                                if(msg.contains("true")){
                                    Intent loggedIn = new Intent(LoginActivity.this, HomeActivity.class);
                                    loggedIn.putExtra("userLogged", response.toString());
                                    startActivity(loggedIn);
                                    finish();
                                }else{
                                    Toast.makeText(getApplicationContext(), "Identifiants Incorrectes", Toast.LENGTH_SHORT).show();
                                }
                            } catch (JSONException e){
                                Toast.makeText(getApplicationContext(), "erreur - 200 ", Toast.LENGTH_SHORT).show();
                            }
                        }
                    }, new Response.ErrorListener() {
                @Override
                public void onErrorResponse(VolleyError error) {
                    Toast.makeText(getApplicationContext(), "Volley on error listener", Toast.LENGTH_SHORT).show();
                }
            });
            requestQueue.add(jsonObjectRequest);
        }
}

这是主页 Activity

public class HomeActivity extends AppCompatActivity implements View.OnClickListener {
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_home);
        String userLogged = getIntent().getStringExtra("userLogged");
    }
    @Override
    protected void onStart() {
        super.onStart();
        Intent serviceIntent = new Intent(this, ForegroundServiceNoPopup.class);
        stopService(serviceIntent);
    }
    @Override
    public void onResume(){
        super.onResume();
        Intent serviceIntent = new Intent(this, ForegroundServiceNoPopup.class);
        stopService(serviceIntent);
    }
    @Override
    protected void onStop() {
        super.onStop();
        Intent serviceIntent = new Intent(this, ForegroundService.class);
        Intent intent = getIntent();
        String userLogged = intent.getStringExtra("userLogged");
        serviceIntent.putExtra("userLogged", userLogged);
        startService(serviceIntent);
    }
    @Override
    protected void onDestroy() {
        super.onDestroy();
        Intent serviceIntent = new Intent(this, ForegroundService.class);
        Intent intent = getIntent();
        String userLogged = intent.getStringExtra("userLogged");
        serviceIntent.putExtra("userLogged", userLogged);
        startService(serviceIntent);
    }
    @Override
    protected void onPause() {
        super.onPause();
        Intent serviceIntent = new Intent(this, ForegroundService.class);
        Intent intent = getIntent();
        String userLogged = intent.getStringExtra("userLogged");
        serviceIntent.putExtra("userLogged", userLogged);
        startService(serviceIntent);
    }
}

这是前台服务页面:

public class ForegroundService extends Service {
    @Override
    public void onCreate() {
        super.onCreate();
    }
    @Override
    public int onStartCommand(Intent intent, int flags, int startId) {
        String input = intent.getStringExtra("inputExtra");
        String userLogged = intent.getStringExtra("userLogged");
        Intent backToHomeActivity = new Intent(this, HomeActivity.class);
        backToHomeActivity.putExtra("userLogged", userLogged);
        PendingIntent pendingIntent = PendingIntent.getActivity(this, 0, backToHomeActivity, PendingIntent.FLAG_UPDATE_CURRENT);

        Notification notification = new NotificationCompat.Builder(this, CHANNEL_ID)
                .setContentTitle("Example Service")
               // .setLargeIcon()
               // .setColor()
                .setContentIntent(pendingIntent)
                .setContentText(input)
                .setSmallIcon(R.drawable.icon)
                .setContentIntent(pendingIntent)
                .setDefaults(NotificationCompat.DEFAULT_ALL)
                .setPriority(NotificationCompat.PRIORITY_MAX)
                .build();

        startForeground(1, notification);
        return START_NOT_STICKY;
    }
    @Override
    public void onDestroy() {
        super.onDestroy();
    }
    @Nullable
    @Override
    public IBinder onBind(Intent intent) {
        return null;
    }
}

我对这一切都很陌生。请帮助我。

Answer 1

解决方案是使用 SharedPreferences。

public class LoginActivity extends AppCompatActivity {

    Button login;
    SharedPreferences sp;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_login);

        login = (Button) findViewById(R.id.loginBtn);

        sp = getSharedPreferences("login",MODE_PRIVATE);

        if(sp.getBoolean("logged",false)){
            goToMainActivity();
        }

        login.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                goToMainActivity();
                sp.edit().putBoolean("logged",true).apply();
            }
        });
    }

    public void goToMainActivity(){
        Intent i = new Intent(this,MainActivity.class);
        startActivity(i);
    }
}

请参阅下面的教程 https://medium.com/@prakharsrivastava_219/keep-the-user-logged-in-android-app-5fb6ce29ed65