在android中創建登錄頁面

Question

EditText txtUserName; 
EditText txtPassword; 
Button btnLogin; 
Button btnCancel; 

    /** Called when the activity is first created. */ 
@Override 
public void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.main); 


    txtUserName=(EditText)this.findViewById(R.id.txtUname); 
    txtPassword=(EditText)this.findViewById(R.id.txtPwd); 
    btnLogin=(Button)this.findViewById(R.id.btnLogin); 
     btnLogin.setOnClickListener(new OnClickListener() { 

      @Override 
      public void onClick(View v) {    
        Intent myIntent = new Intent(v.getContext(), AddName.class); 
        startActivityForResult(myIntent, 0); 
       if((txtUserName.getText().toString()).equals(txtPassword.getText().toString())){ 
        Toast.makeText(LoginappActivity.this, "Login Successful",Toast.LENGTH_LONG).show(); 
        } else{ 
        Toast.makeText(LoginappActivity.this, "Invalid Login",Toast.LENGTH_LONG).show(); 
        } 
         } 
          }); 

}   
     } 

我爲我的應用創建了一個登錄頁面。而我在我的模擬器中運行，如果用戶名和密碼相匹配，應該進入下一個畫面，但在運行此，如果用戶名和密碼是錯誤的應用程序將會第二頁任何人都可以提出

Answer 1

package com.app.NewProjectHttpDemo; 

import java.io.InputStream; 
import java.net.URL; 
import java.util.ArrayList; 

import android.content.Context; 
import android.graphics.drawable.Drawable; 
import android.view.LayoutInflater; 
import android.view.View; 
import android.view.ViewGroup; 
import android.widget.ArrayAdapter; 
import android.widget.ImageView; 
import android.widget.TextView; 

EditText txtUserName; 
EditText txtPassword; 
Button btnLogin; 
Button btnCancel; 

    /** Called when the activity is first created. */ 
@Override 
public void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.main); 


    txtUserName=(EditText)this.findViewById(R.id.txtUname); 
    txtPassword=(EditText)this.findViewById(R.id.txtPwd); 
    btnLogin=(Button)this.findViewById(R.id.btnLogin); 
     btnLogin.setOnClickListener(new OnClickListener() { 

      @Override 
      public void onClick(View v) {    

       if((txtUserName.getText().toString()).equals(txtPassword.getText().toString())){ 
Intent myIntent = new Intent(v.getContext(), AddName.class); 
        startActivityForResult(myIntent, 1); 
        Toast.makeText(LoginappActivity.this, "Login Successful",Toast.LENGTH_LONG).show(); 
        } else{ 
        Toast.makeText(LoginappActivity.this, "Invalid Login",Toast.LENGTH_LONG).show(); 
        } 
         } 
          }); 

}   
     } 

替換此代碼與您的代碼，這將很好地工作

Answer 2

EditText txtUserName; 
EditText txtPassword; 
Button btnLogin; 
Button btnCancel; 

    /** Called when the activity is first created. */ 
@Override 
public void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.main); 


    txtUserName=(EditText)this.findViewById(R.id.txtUname); 
    txtPassword=(EditText)this.findViewById(R.id.txtPwd); 
    btnLogin=(Button)this.findViewById(R.id.btnLogin); 

    btnLogin.setOnClickListener(new OnClickListener() { 

     @Override 
     public void onClick(View v) {    

      if((txtUserName.getText().toString()).equals(txtPassword.getText().toString())){ 
       Intent firstIntent = new Intent(v.getContext(), SecondActivity.class); 
       startActivity(firstIntent); 

       } else{ 
         Intent secondtIntent = new Intent(v.getContext(),SecondActivity.class); 
       startActivity(secondIntent); 
       } 
        } 
         }); 

}
}

Answer 3

  btnLogin=(Button)this.findViewById(R.id.btnLogin); 
     btnLogin.setOnClickListener(new OnClickListener() { 

      @Override 
      public void onClick(View v) {         
       if((txtUserName.getText().toString()).equals(txtPassword.getText().toString())){ 
        Toast.makeText(LoginappActivity.this, "Login Successful",Toast.LENGTH_LONG).show(); 

        Intent myIntent = new Intent(v.getContext(), AddName.class); 
        startActivity(myIntent); 

        } else{ 
        Toast.makeText(LoginappActivity.this, "Invalid Login",Toast.LENGTH_LONG).show(); 
        } 
        } 
       });