java - 如何修复共享偏好以保存我的数据并跳过活动？
问题描述
我想使用“共享首选项”来保存我的用户名和密码，它已保存但在我第二次打开应用程序时不起作用。
import android.content.Intent;
import android.content.SharedPreferences;
import android.graphics.Typeface;
import android.icu.text.IDNA;
import android.support.v4.media.RatingCompat;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.view.animation.Animation;
import android.view.animation.AnimationUtils;
import android.widget.Button;
import android.widget.EditText;
import android.widget.ImageView;
import android.widget.TextView;
import android.widget.Toast;
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 = (TextView)findViewById(R.id.tv_user);
tv_pass = (TextView)findViewById(R.id.tv_pass);
tx_user = (EditText)findViewById(R.id.tx_user);
tx_pass = (EditText)findViewById(R.id.tx_pass);
btn_login = (Button)findViewById(R.id.btn_login);
img_ghorme = (ImageView)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_login_page2);
findall();
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()+"";
String pass = tx_pass.getText()+"";
save_user = save.getString("username", "");
save_pass = save.getString("password", "");
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("");
}
}
});
save = getSharedPreferences("user", MODE_PRIVATE);
save = getSharedPreferences("pass", MODE_PRIVATE);
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();
}
}
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="نام کاربری"
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"
android:background="@drawable/tx_bg"
android:drawableLeft="@drawable/ic_user"
android:ems="10"
android:hint="نام کاربری"
android:inputType="textPersonName"
android:padding="10dp"
android:text=""
android:textColor="@color/textShiri"
android:textColorHint="@color/textShiri"
android:visibility="invisible"
app:layout_constraintHorizontal_bias="0.0"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintRight_toRightOf="parent"
app:layout_constraintTop_toBottomOf="@+id/tv_user" />
<TextView
android:id="@+id/tv_pass"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_marginLeft="8dp"
android:layout_marginRight="15dp"
android:layout_marginTop="20dp"
android:text="رمز عبور"
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_toBottomOf="@+id/tx_user" />
<EditText
android:id="@+id/tx_pass"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_marginLeft="80dp"
android:layout_marginRight="30dp"
android:layout_marginTop="10dp"
android:background="@drawable/tx_bg"
android:drawableLeft="@drawable/ic_pass"
android:ems="15"
android:hint="........."
android:inputType="textPassword"
android:padding="10dp"
android:text=""
android:textColor="@color/textShiri"
android:textColorHint="@color/textShiri"
android:visibility="invisible"
app:layout_constraintHorizontal_bias="1.0"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintRight_toRightOf="parent"
app:layout_constraintTop_toBottomOf="@+id/tv_pass" />
<Button
android:id="@+id/btn_login"
android:layout_width="122dp"
android:layout_height="50dp"
android:layout_marginBottom="0dp"
android:layout_marginLeft="8dp"
android:layout_marginRight="8dp"
android:layout_marginTop="20dp"
android:background="@drawable/btn_bg"
android:text="ورود"
android:textColor="@color/textShiri"
android:visibility="invisible"
app:layout_constraintBottom_toTopOf="@+id/img_ghorme"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintRight_toRightOf="parent"
app:layout_constraintTop_toBottomOf="@+id/tx_pass" />
</android.support.constraint.ConstraintLayout>
我希望当我为用户名和密码编写 admin admin 时，它会保存它，并且我第二次打开应用程序时会跳过该登录页面，但它不起作用并再次显示登录页面
解决方案
在使用 sharedPreference 并为每个密钥对定义两个 sharedPreferences 之前，您没有初始化它。如下更改您的代码。
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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