我有一個具有登錄,注銷功能的Android應用程序.登錄表單包含用戶名和密碼以及登錄按鈕.我想在用戶選中“記住我”復選框時保存用戶名和密碼.

我的project.java文件如下所示：

public class project extends Activity {

private static final int IO_BUFFER_SIZE = 4 * 1024;

/** Called when the activity is first created. */

public int user_id,current_user_id;

public String access_token,username,current_username;

public boolean user_logged_in=false;

public ProgressDialog progdialog;

@Override

public void onCreate(final Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

progdialog = new ProgressDialog(this);

progdialog.setMessage("loading...");

initLogin();

}

public void initLogin(){

setContentView(R.layout.login);

Button button = (Button) findViewById(R.id.login_login);

button.setOnClickListener(new View.OnClickListener(){

public void onClick(View v) {

login();

}

});

}

public void login(){

try{

String login_username=(((EditText) findViewById(R.id.login_username)).getText()).toString();

String login_password=(((EditText) findViewById(R.id.login_password)).getText()).toString();

List nameValuePairs = new ArrayList(2);

nameValuePairs.add(new BasicNameValuePair("username",login_username));

nameValuePairs.add(new BasicNameValuePair("password",login_password));

String content=postUrlContent(api_url "landing/authenticate",nameValuePairs);

JSONObject jObject = new JSONObject(content);

JSONObject respObject = jObject.getJSONObject("response");

Boolean success=respObject.getBoolean("success");

String message=respObject.getString("message");

Boolean logged_in=respObject.getBoolean("logged_in");

if(logged_in){

user_id=respObject.getInt("user_id");

access_token=respObject.getString("access_token");

username=respObject.getString("username");

current_username=username;

current_user_id=user_id;

user_logged_in=true;

//initFeeds(username);

test(0);

}else{

createDialog("Error",message);

}

}catch(Exception e){

}

}

解決方法:

您可以使用應用共享偏好設置.可以使用為這些prefs設置的密鑰隨時訪問prefs

static final String KEY_USERNAME = "username";

static final String KEY_PASSWORD = "password";

if (rememberMe) { //save username and pw to prefs

SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(this);

Editor ed = prefs.edit();

ed.putString(KEY_USERNAME, theUsername);

ed.putString(KEY_PASSWORD, thePW);

ed.commit();

}

要訪問信息,例如onCreate方法：

SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(this);

String username = prefs.getString(KEY_USERNAME, "Default Value if not found");

String password = prefs.getString(KEY_PASSWORD, ""); //return nothing if no pass saved

來源：https://www.icode9.com/content-1-401801.html

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