Question

我有这个按钮代码，它连接到数据库

bLogin.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            final String username = etUsername.getText().toString();
            final String password = etPassword.getText().toString();

            // Response received from the server
            Response.Listener<String> responseListener = new Response.Listener<String>() {
                @Override
                public void onResponse(String response) {
                    try {
                        JSONObject jsonResponse = new JSONObject(response);
                        boolean success = jsonResponse.getBoolean("success");

                        if (success) {
                            String name = jsonResponse.getString("name");
                            String email = jsonResponse.getString("email");
                            String alamat = jsonResponse.getString("alamat");
                            int notelp = jsonResponse.getInt("notelp");
                            String username = jsonResponse.getString("username");
                            String password = jsonResponse.getString("password");

                            Intent intent = new Intent(MainActivity.this, adminarea.class);
                            intent.putExtra("name", name);
                            intent.putExtra("email", email);
                            intent.putExtra("alamat", alamat);
                            intent.putExtra("notelp", notelp);
                            intent.putExtra("username", username);
                            intent.putExtra("password", password);
                            MainActivity.this.startActivity(intent);
                        } else {
                            AlertDialog.Builder builder = new AlertDialog.Builder(MainActivity.this);
                            builder.setMessage("Login Gagal")
                                    .setNegativeButton("Ulangi", null)
                                    .create()
                                    .show();
                        }

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

我有一个名为admin的表，其中包含字段名称，电子邮件等。如何从数据库中获取数据，然后将名称，电子邮件，alamat和其他数据保存到共享的prefences中。那你可以帮我把它叫做另一个活动吗？

Answer 1

首先，您必须创建SharedPreferences

SharedPreferences pref = getApplicationContext().getSharedPreferences("YOUR_PREF_NAME", MODE_PRIVATE); 
Editor edt = pref.edit();

优先添加价值：

edt.putString("name", name);           
edt.putString("email", email);       
edt.putString("alamat", alamat);   
edt.putString("notelp", notelp);     
edt.putString("username",username); 

// Save your changes
edt.commit();

现在从偏好中获取数据：

String name=pref.getString("name", null);  
String email=pref.getString("email", null);  
String alamat=pref.getString("alamat", null);  
String notelp=pref.getString("notelp", null);  
String username=pref.getString("username", null);

如果要清除首选项数据：

edt.clear();
edt.commit();

Answer 2

保存如下。

        SharedPreferences getPref = PreferenceManager.getDefaultSharedPreferences(this);

        Intent intent = new Intent(MainActivity.this, adminarea.class);

        intent.putExtra("name", name);
        getPref.edit().putString("name",name).apply();
        intent.putExtra("email", email);
        getPref.edit().putString("email",name).apply();
        intent.putExtra("alamat", alamat);
        getPref.edit().putString("alamat",name).apply();
        intent.putExtra("notelp", notelp);
        intent.putExtra("username", username);
        intent.putExtra("password", password);

        MainActivity.this.startActivity(intent);

像这样检索。

        SharedPreferences getPref = PreferenceManager.getDefaultSharedPreferences(this);
        String name = getPref.getString("name","");
        String email = getPref.getString("email","");
        String alamat = getPref.getString("alamat","");

Answer 3

创建一个SharePrefUtil类

private Context context;
private SharedPreferences prefs;

public SharePrefUtil(Context mContext) {
    this.context = mContext;
    prefs = this.context.getSharedPreferences("your package name", Context.MODE_PRIVATE);
}


public void setValueInSharePref(String keyName, String value) {
    prefs.edit().putString(keyName, value).apply();
}

public String getValueFromSharePref(String keyName) {
    return prefs.getString(keyName, "");
}
}

什么时候想要存储值只需在您的活动中创建一个类的对象即可获取或设置一个值例如

SharePreUtil shef = new SharePreUtil(this);

什么时候在活动中设置值

shef.setValueInSharePref("key", "yourvalue");

当你想获得价值时

shef.getValueFromSharePref("key");

一切顺利......

Answer 4

您可以在活动类的SharedPreferences中保存数据，如下所示：

config/environments/[production.rb, development.rb, test.rb]

在您要获取它们的活动中，请执行以下操作：

  SharedPreferences sharedPreferences = getSharedPreferences("USER_INFO", Context.MODE_PRIVATE);
    SharedPreferences.Editor editor = sharedPreferences.edit();
    editor.putString("name", name);
    editor.putString("email", alamat);
    editor.putString("alamat", alamat);
    editor.commit();

放入int，

  SharedPreferences sharedPreferences = getSharedPreferences("USER_INFO", Context.MODE_PRIVATE);
    String name=sharedPreferences.getString("name", "abc");
    String email=sharedPreferences.getString("email", "abc@gmail.com");

要重温它，

editor.putInt("number",0);

Answer 5

for ($i = 0; $i < 4; $i++) {
     name_person( $name_array[$i], $i+1);
}

Answer 6

引用https://developer.android.com/training/basics/data-storage/shared-preferences.html

上的培训指南

var obj = {
  "locations": [
      {
        "id": 8817,
        "loc": "NEW YORK CITY"
      },
      {
        "id": 2873,
        "loc": "UNITED STATES"
      },
      {
        "id": 1501,
        "loc": "NEW YORK STATE"
      }
    ]
}
var val = '8817';
var res = obj.locations.filter(function(item) {
    return item.id == val;
  });

  console.log(res[0].loc);

并阅读

<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.1/jquery.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/react/0.14.8/react.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/react/0.14.8/react-dom.min.js"></script>

Answer 7

在你的其他活动中....首先从意图中接收数据......像这样

SharedPreferences sharedPref = getActivity().getPreferences(Context.MODE_PRIVATE);
SharedPreferences.Editor editor = sharedPref.edit();
editor.putInt(getString(R.string.saved_high_score), newHighScore);
editor.commit();

现在，将这些数据保存到共享的prefrences ....要做到这一点......你需要sharedPreferences.Editor来写数据......就像这样......

SharedPreferences sharedPref = getActivity().getPreferences(Context.MODE_PRIVATE);
int defaultValue = getResources().getInteger(R.string.saved_high_score_default);
long highScore = sharedPref.getInt(getString(R.string.saved_high_score), defaultValue);

Answer 8

if (success) {

    // once you retrieve all the required data
    SharedPreferences prefs = this.getSharedPreferences("com.example.app", Context.MODE_PRIVATE);

    // Writing data to SharedPreferences
    Editor editor = prefs.edit();
    editor.putString("name", name);
    editor.putString("email", email);
    editor.putInt("notelp", notelp);
    editor.commit();

    // start your AdminArea activity here
}

在AdminArea类中检索数据：

// Reading from SharedPreferences
String value = prefs.getString("name", "DEFAULT_STRIGN"); // if the given key not found, it'll take the default string as value
int intValue = prefs.getInt("notelp", -1); // instead of -1, you can give any default value

希望这有助于：）

如何使用共享首选项来保存从数据库获取的数据？

8 个答案: