如何使用共享首选项检索用户名ID并进行其他活动

问题描述 投票：0回答：3

您好，我正在尝试使用sharedpreferences检索用户名ID并进行一项活动，因此无法调用它，但是在另一项活动中，它被正确调用了

这是我的LoginActivity代码

public class Login extends AppCompatActivity {

ProgressDialog pDialog;
Button btn_login;
EditText txt_username, txt_password;

int success;
ConnectivityManager conMgr;

private String url = Server.URL_LOGIN;

private static final String TAG = Login.class.getSimpleName();

private static final String TAG_SUCCESS = "success";
private static final String TAG_MESSAGE = "message";

public final static String TAG_USERNAME = "username";
public final static String TAG_ID = "id_mentor";
public final static String TAG_ADMIN = "iwanwahyudi";

String tag_json_obj = "json_obj_req";
String user_type = "iwanwahyudi";

SharedPreferences sharedpreferences;
Boolean session = false;
String id_mentor, username, iwanwahyudi;
public static final String my_shared_preferences = "my_shared_preferences";
public static final String session_status = "session_status";

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

    conMgr = (ConnectivityManager) getSystemService(Context.CONNECTIVITY_SERVICE);
    {
        if (conMgr.getActiveNetworkInfo() != null
                && conMgr.getActiveNetworkInfo().isAvailable()
                && conMgr.getActiveNetworkInfo().isConnected()) {
        } else {
            Toast.makeText(getApplicationContext(), "No Internet Connection",
                    Toast.LENGTH_LONG).show();
        }
    }

    btn_login = (Button) findViewById(R.id.btn_login);
    txt_username = (EditText) findViewById(R.id.txt_username);
    txt_password = (EditText) findViewById(R.id.txt_password);

    sharedpreferences = getSharedPreferences(my_shared_preferences, Context.MODE_PRIVATE);
    session = sharedpreferences.getBoolean(session_status, false);
    id_mentor = sharedpreferences.getString(TAG_ID, null);
    username = sharedpreferences.getString(TAG_USERNAME, null);
    iwanwahyudi = sharedpreferences.getString(TAG_ADMIN, null);



    btn_login.setOnClickListener(new View.OnClickListener() {

        @Override
        public void onClick(View v) {
            // TODO Auto-generated method stub
            String username = txt_username.getText().toString();
            String password = txt_password.getText().toString();

            if (username.trim().length() > 0 && password.trim().length() > 0) {
                if (conMgr.getActiveNetworkInfo() != null
                        && conMgr.getActiveNetworkInfo().isAvailable()
                        && conMgr.getActiveNetworkInfo().isConnected()) {
                    checkLogin(username, password);
                } else {
                    Toast.makeText(getApplicationContext() ,"No Internet Connection", Toast.LENGTH_LONG).show();
                }
            } else {
                Toast.makeText(getApplicationContext() ,"Kolom tidak boleh kosong", Toast.LENGTH_LONG).show();
            }
        }
    });


}

private void checkLogin(final String username, final String password) {
    pDialog = new ProgressDialog(this);
    pDialog.setCancelable(false);
    pDialog.setMessage("Logging in ...");
    showDialog();

    StringRequest strReq = new StringRequest(Request.Method.POST, url, new Response.Listener<String>() {

        @Override
        public void onResponse(String response) {
            Log.e(TAG, "Login Response: " + response.toString());
            hideDialog();

            try {
                JSONObject jObj = new JSONObject(response);
                success = jObj.getInt(TAG_SUCCESS);

                if (success == 1) {
                    String username = jObj.getString(TAG_USERNAME);
                    String id_mentor = jObj.getString(TAG_ID);

                    Log.e("Successfully Login!", jObj.toString());

                    Toast.makeText(getApplicationContext(), jObj.getString(TAG_MESSAGE), Toast.LENGTH_LONG).show();

                    SharedPreferences.Editor editor = sharedpreferences.edit();
                    editor.putBoolean(session_status, true);
                    editor.putString(TAG_ID, id_mentor);
                    editor.putString(TAG_USERNAME, username);
                    editor.commit();


                    if(txt_username.getText().toString().equals("iwanwahyudi")){
                        Intent intent1 = new Intent(Login.this, AdminActivity.class);
                        intent1.putExtra(TAG_ID, id_mentor);
                        intent1.putExtra(TAG_USERNAME, username);
                        finish();
                        startActivity(intent1);
                    }
                    else {
                        Intent intent1 = new Intent(Login.this, MainActivity.class);
                        intent1.putExtra(TAG_ID, id_mentor);
                        intent1.putExtra(TAG_USERNAME, username);
                        finish();
                        startActivity(intent1);
                    }

                }else {
                    Toast.makeText(getApplicationContext(),
                            jObj.getString(TAG_MESSAGE), Toast.LENGTH_LONG).show();

                }
            } catch (JSONException e) {
                e.printStackTrace();
            }

        }
    }, new Response.ErrorListener() {

        @Override
        public void onErrorResponse(VolleyError error) {
            Log.e(TAG, "Login Error: " + error.getMessage());
            Toast.makeText(getApplicationContext(),
                    error.getMessage(), Toast.LENGTH_LONG).show();

            hideDialog();

        }
    }) {

        @Override
        protected Map<String, String> getParams() {
            Map<String, String> params = new HashMap<String, String>();
            params.put("username", username);
            params.put("password", password);

            return params;
        }

    };

    AppController.getInstance().addToRequestQueue(strReq, tag_json_obj);
}

private void showDialog() {
    if (!pDialog.isShowing())
        pDialog.show();
}

private void hideDialog() {
    if (pDialog.isShowing())
        pDialog.dismiss();
}

}

这是我要在其中输入用户名ID的AbsenAcvitivity

public class Absen extends AppCompatActivity implements View.OnClickListener {

SharedPreferences sharedpreferences;
String id_mentor, username;
public static final String TAG_ID = "id_mentor";
public static final String TAG_USERNAME = "username";
EditText  keterangan1, tilawah1, ujian1, pekan1, materi1;
TextView nama1, nim2, id_mentor1;
private Button buttonSave;


@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_absen);

    sharedpreferences = getSharedPreferences(Login.my_shared_preferences, Context.MODE_PRIVATE);

    id_mentor = getIntent().getStringExtra(TAG_ID);
    username = getIntent().getStringExtra(TAG_USERNAME);

    String nama = getIntent().getExtras().getString("nama");
    String nim = getIntent().getExtras().getString("nim");

    nama1 = (TextView) findViewById(R.id.nama);
    nim2 = (TextView) findViewById(R.id.nim2);
    id_mentor1 = (TextView) findViewById(R.id.text_view);
    keterangan1 = (EditText) findViewById(R.id.keterangan);
    tilawah1 = (EditText) findViewById(R.id.tilawah);
    ujian1 = (EditText) findViewById(R.id.ujian);
    pekan1 = (EditText) findViewById(R.id.pekan);
    materi1 = (EditText) findViewById(R.id.materi);

    buttonSave = (Button) findViewById(R.id.buttonSave);

    nama1.setText(nama);
    nim2.setText(nim);
    id_mentor1.setText(id_mentor);

    buttonSave.setOnClickListener(this);

}
private void addEmployee(){

    final String nama = nama1.getText().toString().trim();
    final String nim = nim2.getText().toString().trim();
    final String pekan = pekan1.getText().toString().trim();
    final String keterangan = keterangan1.getText().toString().trim();
    final String materi = materi1.getText().toString().trim();
    final String tilawah = tilawah1.getText().toString().trim();
    final String ujian = ujian1.getText().toString().trim();
    final String idmentor = id_mentor1.getText().toString().trim();


    class AddEmployee extends AsyncTask<Void,Void,String> {

        ProgressDialog loading;

        @Override
        protected void onPreExecute() {
            super.onPreExecute();
            loading = ProgressDialog.show(Absen.this,"Menambahkan...","Tunggu...",false,false);
        }

        @Override
        protected void onPostExecute(String s) {
            super.onPostExecute(s);
            loading.dismiss();
            Toast.makeText(Absen.this,s,Toast.LENGTH_LONG).show();
        }

        @Override
        protected String doInBackground(Void... v) {
            HashMap<String,String> params = new HashMap<>();
            params.put(Server.KEY_EMP_PEKAN,pekan);
            params.put(Server.KEY_EMP_NAMA,nama);
            params.put(Server.KEY_EMP_NIM2,nim);
            params.put(Server.KEY_EMP_KETERANGAN,keterangan);
            params.put(Server.KEY_EMP_MATERI,materi);
            params.put(Server.KEY_EMP_TILAWAH,tilawah);
            params.put(Server.KEY_EMP_UJIAN,ujian);
            params.put(Server.KEY_EMP_ID_MENTOR,idmentor);

            RequestHandler rh = new RequestHandler();
            String res = rh.sendPostRequest(Server.URL_ADD, params);
            return res;
        }
    }

    AddEmployee ae = new AddEmployee();
    ae.execute();
}

@Override
public void onClick(View v) {
    if(v == buttonSave){
        addEmployee();
    }
}

@Override
public void onPointerCaptureChanged(boolean hasCapture) {

}

}

以及正确调用用户名ID的MainActivity

public class MainActivity extends AppCompatActivity
    implements NavigationView.OnNavigationItemSelectedListener {

SharedPreferences sharedpreferences;
String id_mentor, username;
public static final String TAG_ID = "id_mentor";
public static final String TAG_USERNAME = "username";
TextView textView;


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

    sharedpreferences = getSharedPreferences(Login.my_shared_preferences, Context.MODE_PRIVATE);

    id_mentor = getIntent().getStringExtra(TAG_ID);
    username = getIntent().getStringExtra(TAG_USERNAME);
    Log.d("CEK mentor",id_mentor);


    DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
    ActionBarDrawerToggle toggle = new ActionBarDrawerToggle(
            this, drawer, toolbar, R.string.navigation_drawer_open, R.string.navigation_drawer_close);
    drawer.addDrawerListener(toggle);
    toggle.syncState();

    NavigationView navigationView = (NavigationView) findViewById(R.id.nav_view);
    navigationView.setNavigationItemSelectedListener(this);

    View hearedView = navigationView.getHeaderView(0);
    textView = (TextView) hearedView.findViewById(R.id.textView);
    textView.setText(id_mentor);

对不起我的语法不好，谢谢指教

android sharedpreferences
3个回答
0
投票

根据我的了解，您永远不会使用Sharedpreference中的值。您的MainActivity可以获取username ID的原因是，当您从LoginActivity成功登录时，您会将这些值与Intent一起出现。当您使用Absen(Activity)时，您可能无法通过意图放置这些值，因此它将为null并且不会显示。 [我仍然不知道你怎么称呼Absen(Activity)，所以我想你不是通过Absen(Activity)的意图发送数据的。

PS。您可以从sharedPreference获取数据，因此没有理由通过Intent发送有关在共享首选项中也收集了哪些数据的数据。

0
投票

您的问题是“您想使用sharePreference获取用户ID”，但您没有使用它来获取用户ID。您正在使用intent获取Absen Activity中的用户ID。但是您也没有通过意图将数据传递到Absen Activity。如果要使用sharePreferences，则只需使用

id_mentor = sharedpreferences.getString(TAG_ID,"");
username = sharedpreferences.getString(TAG_USERNAME, "");

在Absen Activity中。希望对您有帮助。 ：）

0
投票

通过这种方式，我们可以在sharedPreferences中保存并获取数据：

保存数据：

  SharedPreferences pref = getApplicationContext().getSharedPreferences("my_shared_preferences", 0); // 0 - for private mode
  Editor editor = pref.edit();
   SharedPreferences.Editor editor = sharedpreferences.edit();
                editor.putBoolean(session_status, true);
                editor.putString(TAG_ID, id_mentor);
                editor.putString(TAG_USERNAME, username);
                editor.commit();

要获取数据：

 pref.getString(TAG_USERNAME, null); // getting String
 pref.getString(TAG_ID, null); // getting String

您应该使用上面的代码通过sharedPreference获取数据

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