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[英]The SharedPreferences doesn't save the checked box in my Android app
[英]SharedPreferences doesn't save my username
我没有收到任何错误时,SharedPreferences不会保存我的用户名。 我已经通过一些教程检查了我的方法,但找不到错误所在。 我已经尝试了commit()
和'apply()',尽管那没有什么不同。
有人发现错误?
我的代码:
public class MainActivity extends AppCompatActivity implements AsyncResponse, View.OnClickListener {
EditText etUsername, etPassword;
ImageButton btnLogin;
String username;
CheckBox ckbx_login;
public static final String PREFS_NAME = "MyPrefsFile";
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
requestWindowFeature(Window.FEATURE_NO_TITLE);
setContentView(R.layout.activity_main);
etUsername = (EditText) findViewById(R.id.etUsername);
etPassword = (EditText) findViewById(R.id.etPassword);
btnLogin = (ImageButton) findViewById(R.id.btnLogin);
btnLogin.setOnClickListener(this);
username = etUsername.getText().toString();
}
@Override
public void processFinish(String result) {
if(result.equals("success")) {
SharedPreferences.Editor editor = getApplicationContext().getSharedPreferences(PREFS_NAME,0).edit();
editor.putString("loginname",username);
editor.commit();
Intent in = new Intent(this, SubActivity.class);
String naam2= etUsername.getText().toString();
in.putExtra("naam2",naam2);
startActivity(in);
}
else{
Toast.makeText(this,"Inloggen mislukt", Toast.LENGTH_LONG).show();
}
}
@Override
public void onClick(View view) {
HashMap postData = new HashMap();
postData.put("mobile", "android");
postData.put("txtUsername", etUsername.getText().toString());
postData.put("txtPassword", etPassword.getText().toString());
PostResponseAsyncTask task = new PostResponseAsyncTask(this, postData);
task.execute("http://exemple.com");
}
第二类:
public static final String PREFS_NAME = "MyPrefsFile";
String name;
TextView msg_welcome;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
requestWindowFeature(Window.FEATURE_NO_TITLE);
setContentView(R.layout.activity_sub);
msg_welcome = (TextView) findViewById(R.id.txtVwelcome);
SharedPreferences prefs = this.getSharedPreferences(PREFS_NAME,0);
String restored_loginname = prefs.getString("loginname",null);
if(restored_loginname != null) {
name = prefs.getString("name", "No name defined");
}
Toast.makeText(getApplicationContext(),name,Toast.LENGTH_LONG).show();
}
public void scan(View View){
zXingScannerView = new ZXingScannerView(getApplicationContext());
setContentView(zXingScannerView);
zXingScannerView.setResultHandler(this);
zXingScannerView.startCamera();
}
@Override
protected void onPause() {
super.onPause();
zXingScannerView.stopCamera();
}
@Override
public void handleResult(Result result) {
// Toast.makeText(getApplicationContext(),result.getText(),Toast.LENGTH_LONG).show();
Intent i = new Intent(getApplicationContext(), Avt_form2.class);
String qrcode = result.getText();
i.putExtra("qrcode",qrcode);
startActivity(i);
}
顺便说一句,我知道Postdata已经过时了。 我正在寻找替换它。
问题:当前,当您没有用户输入时,您在onCreate
中使用username
的值,因此
username = etUsername.getText().toString();
应该在用户输入可用后(如onclick
要么
@Override
public void processFinish(String result) {
if(result.equals("success")) {
SharedPreferences.Editor editor = getApplicationContext().getSharedPreferences(PREFS_NAME,0).edit();
username = etUsername.getText().toString();
//^^^^^^^^^
editor.putString("loginname",username);
editor.commit();
注意: name
以前没有用来存储任何值,我name2
使用name2
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