commit logon verification

app/src/main/java/com/example/Cat/activity/activity/MainActivity.java

@@ -3,23 +3,31 @@ package com.example.Cat.activity.activity;
 import androidx.appcompat.app.AppCompatActivity;
 
 import android.content.Intent;
+import android.database.sqlite.SQLiteDatabase;
 import android.os.Bundle;
 import android.view.View;
 import android.widget.Button;
 import android.widget.EditText;
 import android.widget.ImageView;
+import android.widget.Toast;
 
 import com.example.Cat.R;
 
+import java.util.ArrayList;
+import java.util.List;
+
 public class MainActivity extends AppCompatActivity implements View.OnClickListener {
     private Button registerButton, loginButton;
     private EditText usernameText, paswdEdit;
-
+    List<UserInfo> list ;
 
 
     @Override
     protected void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
+        User_Database user=new User_Database(MainActivity.this);
+        SQLiteDatabase sqLiteDatabase=user.getReadableDatabase();
+
         setContentView(R.layout.user_login);
         init();
     }
@@ -41,7 +49,23 @@ public class MainActivity extends AppCompatActivity implements View.OnClickListe
                 startActivity(intent);
                 break;
             case R.id.login:
+                yanz();
                 break;
         }
     }
+    public void yanz(){
+        //UserInfo info;
+        Intent intent = new Intent(MainActivity.this, UserActivity.class);
+        User_Database user=new User_Database(MainActivity.this);
+        SQLiteDatabase sqLiteDatabase=user.getReadableDatabase();
+        list=user.queryByname(sqLiteDatabase,usernameText.getText().toString());
+        //info=list.get(0);
+        if(paswdEdit.getText().toString().equals(list.get(0).paswd)){
+            startActivity(intent);
+
+        }
+        else{
+            Toast.makeText(this, "密码错误！", Toast.LENGTH_SHORT).show();
+        }
+    }
 }

app/src/main/java/com/example/Cat/activity/activity/User_Database.java

@@ -90,23 +90,23 @@ public class User_Database extends SQLiteOpenHelper {
         sqLiteDatabase.close();
         return list;
     }
-    public List<UserInfo> queryByname(SQLiteDatabase sqLiteDatabase,String name) {
+    public List<UserInfo> queryByname(SQLiteDatabase sqLiteDatabase,String username) {
-        Cursor cursor = sqLiteDatabase.query("user", null, "name=?", new String[]{name}, null, null, "id ASC");
+        Cursor cursor = sqLiteDatabase.query("user", null, "username=?", new String[]{username}, null, null, "id ASC");
         List<UserInfo> list = new ArrayList<UserInfo>();
         while (cursor.moveToNext()) {
             int id = cursor.getInt(cursor.getColumnIndex("id"));
-            Log.i("SQLite","id="+id);
+           // Log.i("SQLite","id="+id);
-            String username = cursor.getString(1);
+            String name = cursor.getString(1);
-            Log.i("SQLite","username="+username);
+           // Log.i("SQLite","username="+username);
             String paswd = cursor.getString(2);
-            Log.i("SQLite","paswd="+paswd);
+            //Log.i("SQLite","paswd="+paswd);
             String sex = cursor.getString(3);
-            Log.i("SQLite","sex="+sex);
+           // Log.i("SQLite","sex="+sex);
             String city = cursor.getString(4);
-            list.add(new UserInfo(id, username, paswd, sex, city));
+            list.add(new UserInfo(id, name, paswd, sex, city));
         }
         cursor.close();
-        sqLiteDatabase.close();
+        //sqLiteDatabase.close();
         return list;
     }