如何在 android 中更新共享首选项字符串（密码）

Question

**当应用程序打开时，非物质性会询问 password.Initially 密码是静态的，如 (1111)。当在主页 activity 中输入用户时，更改密码选项是 available.Could 请帮助如何执行此操作...谢谢

1. MainActivity.java
String storedPassword = "1111"; 
strPassword=tv_password.getText().toString();
            if(storedPassword.equals(strPassword)) {
                Intent MainIntent = new Intent(MainActivity.this, HomeActivity.class);
                startActivity(MainIntent);
            }else {
                Toast.makeText(MainActivity.this,"Please check your password",Toast.LENGTH_LONG).show();
            }   

2. Homeactivity.java
public class HomeActivity extends Activity implements View.OnClickListener {
private Button bt_change_password;
 AlertDialog.Builder alert = new AlertDialog.Builder(this);

            alert.setTitle("Edit Password");

            LinearLayout layout = new LinearLayout(this);
            layout.setOrientation(LinearLayout.VERTICAL);
            LinearLayout.LayoutParams params = new LinearLayout.LayoutParams(
                    LinearLayout.LayoutParams.FILL_PARENT, LinearLayout.LayoutParams.WRAP_CONTENT);
            params.setMargins(20, 0, 30, 0);
            EditText first_password = new EditText(HomeActivity.this);
            EditText secound_password = new EditText(HomeActivity.this);
            first_password.setHint("new password");
            secound_password.setHint("new password(again)");
            layout.addView(first_password, params);
            layout.addView(secound_password, params);
            alert.setView(layout);
            alert.setPositiveButton("OK", new DialogInterface.OnClickListener() {
                public void onClick(DialogInterface dialog, int whichButton) {

                }
            });
            alert.setNegativeButton("Cancel", new DialogInterface.OnClickListener() {
                public void onClick(DialogInterface dialog, int whichButton) {
                    // do nothing
                }
            });
            alert.show();
            break;

Answer 1

public class PrefManager {
    SharedPreferences pref;
    SharedPreferences.Editor editor;
    Context _context;

    // shared pref mode
    int PRIVATE_MODE = 0;

    // Shared preferences file name
    private static final String PREF_NAME = "MY_TAG";
    private static final String PASS_TAG= "my_pass_tag";


 public PrefManager(Context context) {
        this._context = context;
        pref = _context.getSharedPreferences(PREF_NAME, PRIVATE_MODE);
        editor = pref.edit();
    }

 public void Setpassword(String password) {
        editor.putString(PASS_TAG, password);
        editor.commit();
    }
    public int getpassword() {
        return pref.getString(PASS_TAG);
    }}

然后就可以使用了

PrefManager prefManager;
    prefManager = new PrefManager(this);
    String _act = prefManager.getpassword();
    prefManager.setpassword(password)

Answer 2

Problem is resolved...
set Shared Pref:             
             alert.setPositiveButton("OK", new DialogInterface.OnClickListener() {
                public void onClick(DialogInterface dialog, int whichButton) {
                    userId= first_password.getText().toString();
                    SharedPreferences settings = PreferenceManager
                            .getDefaultSharedPreferences(HomeActivity.this);
                    SharedPreferences.Editor edit = settings.edit();
                    edit.putString("name", userId);
                    edit.commit();
                    }

get shared pref:

SharedPreferences settins = PreferenceManager
            .getDefaultSharedPreferences(MainActivity.this);
    strPassword=settins.getString("name", storedPassword);

如何在 android 中更新共享首选项字符串（密码）

How to update shared preference string (password) in android

android

sharedpreferences

android-sharedpreferences