我想使用“共享首選項”來保存我的用戶名和密碼，它已保存但在我第二次打開該應用程序時不起作用。XML:<?xml version="1.0" encoding="utf-8"?> <android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:app="http://schemas.android.com/apk/res-auto" xmlns:tools="http://schemas.android.com/tools"android:layout_width="match_parent"android:layout_height="match_parent"tools:context="com.home.seesion10.Login_page"android:layoutDirection="rtl"android:textDirection="rtl"android:background="@color/textShiri"><ImageView android:id="@+id/img_ghorme" android:layout_width="wrap_content" android:layout_height="wrap_content" app:srcCompat="@drawable/cirlcleghormesabzi" android:layout_marginTop="1500dp" app:layout_constraintTop_toTopOf="parent" android:layout_marginLeft="100dp" app:layout_constraintLeft_toLeftOf="parent" app:layout_constraintRight_toRightOf="parent" app:layout_constraintBottom_toBottomOf="parent" app:layout_constraintHorizontal_bias="0.0" app:layout_constraintVertical_bias="0.902" android:layout_marginStart="100dp" /><TextView android:id="@+id/tv_user" android:layout_width="0dp" android:layout_height="wrap_content" android:layout_marginLeft="8dp" android:layout_marginRight="15dp" android:layout_marginTop="20dp" android:text="??? ??????" android:textSize="15sp" android:visibility="invisible" app:layout_constraintHorizontal_bias="0.0" app:layout_constraintLeft_toLeftOf="parent" app:layout_constraintRight_toRightOf="parent" app:layout_constraintTop_toTopOf="parent" /><EditText android:id="@+id/tx_user" android:layout_width="0dp" android:layout_height="wrap_content" android:layout_marginLeft="80dp" android:layout_marginRight="30dp" android:layout_marginTop="10dp"<Button android:id="@+id/btn_login" </android.support.constraint.ConstraintLayout>我希望當我為用戶名和密碼編寫 admin admin 時，它會保存它，并且我第二次打開應用程序時它會跳過該登錄頁面但它不起作用并再次顯示登錄頁面
1 回答
呼如林
TA貢獻1798條經驗 獲得超3個贊
您沒有在使用 sharedPreference 之前初始化它，也沒有為每個密鑰對定義兩個 sharedPreferences。如下更改您的代碼。
public class Login_page extends AppCompatActivity {
TextView tv_user, tv_pass;
EditText tx_user, tx_pass;
Button btn_login;
ImageView img_ghorme;
SharedPreferences save;
public void findall()
{
tv_user = findViewById(R.id.tv_user);
tv_pass = findViewById(R.id.tv_pass);
tx_user = findViewById(R.id.tx_user);
tx_pass = findViewById(R.id.tx_pass);
btn_login = findViewById(R.id.btn_login);
img_ghorme = findViewById(R.id.img_ghorme);
}
public String save_user = "";
public String save_pass = "";
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main2);
findall();
save = getSharedPreferences("userInfo", MODE_PRIVATE);
save_user = save.getString("username", "");
save_pass = save.getString("password", "");
if(save_user.equals("admin") && save_pass.equals("admin"))
{
Intent skip = new Intent(Login_page.this, food_page.class);
startActivity(skip);
}
btn_login.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v)
{
String user = tx_user.getText().toString();
String pass = tx_pass.getText().toString();
SharedPreferences.Editor e = save.edit();
e.putString("username", user);
e.putString("password", pass);
e.apply();
if(user.equals("admin") && pass.equals("admin"))
{
Intent food = new Intent(Login_page.this, food_page.class);
startActivity(food);
}
if (!user.equals("admin") || !pass.equals("admin"))
{
e.putString("username", "");
e.putString("password", "");
e.apply();
tx_user.setText("");
tx_pass.setText("");
}
}
});
Typeface font_shabnam = Typeface.createFromAsset(getAssets(),"fonts/Shabnam.ttf");
Typeface font_shabnam_light = Typeface.createFromAsset(getAssets(),"fonts/Shabnam_Light.ttf");
Typeface font_shabnam_bold = Typeface.createFromAsset(getAssets(),"fonts/Shabnam.ttf");
tv_user.setTypeface(font_shabnam_bold);
tv_pass.setTypeface(font_shabnam_bold);
tx_user.setTypeface(font_shabnam_light);
tx_pass.setTypeface(font_shabnam_light);
btn_login.setTypeface(font_shabnam_bold);
Animation ani_rtl = AnimationUtils.loadAnimation(Login_page.this, R.anim.animation_ltr);
Animation ani_ltr = AnimationUtils.loadAnimation(Login_page.this, R.anim.animation_rtl);
Animation ani_fade = AnimationUtils.loadAnimation(Login_page.this, R.anim.fade);
Animation ani_dtu = AnimationUtils.loadAnimation(Login_page.this, R.anim.animation_dtu);
tv_user.setVisibility(View.VISIBLE);
tv_user.startAnimation(ani_rtl);
tv_pass.setVisibility(View.VISIBLE);
tv_pass.startAnimation(ani_rtl);
tx_user.setVisibility(View.VISIBLE);
tx_user.startAnimation(ani_ltr);
tx_pass.setVisibility(View.VISIBLE);
tx_pass.startAnimation(ani_ltr);
btn_login.setVisibility(View.VISIBLE);
btn_login.startAnimation(ani_fade);
img_ghorme.startAnimation(ani_dtu);
}
@Override
protected void onPause() {
super.onPause();
finish();
}
}
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