Question

我创建登录＆amp;注册课。用户应该进入登录页面，但如果他没有帐户，他可以按链接注册页面。不幸的是，当他点击链接时，它会导致一个空白的黑色页面（动作标题就在那里）。没有错误，只要我担心我的代码是正确的（很明显它不是）。这是我的代码

登录

    package com.spamcity;

import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
import android.widget.Toast;

public class login extends Activity {

    private EditText email;
    private EditText password;
    private Button login;
    private TextView gosignup;

    @Override
    protected void onCreate(Bundle savedInstanceState){
        super.onCreate(savedInstanceState);
        setContentView(R.layout.login);
        setupVariables();

        login.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                // TODO Auto-generated method stub              
                startActivity(new Intent(login.this, MainActivity.class));
                finish();
            }
        });

        gosignup.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                // TODO Auto-generated method stub
                startActivity(new Intent(login.this, signupActivity.class));                
                finish();
            }
        });
    }

    private void setupVariables(){
        email =  (EditText) findViewById(R.id.logemail);
        password = (EditText) findViewById(R.id.logpassword);
        login = (Button) findViewById(R.id.btnLogin);
        gosignup = (TextView) findViewById(R.id.textView2);
    }
}

注册

    package com.spamcity;

import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.Menu;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;
import android.view.View.OnClickListener;

public class signupActivity extends Activity {

    private EditText idNo;
    private EditText fullname;
    private EditText email;
    private EditText password;
    private Button signup;

    public class signupScreen extends Activity {
        @Override
        protected void onCreate(Bundle savedInstanceState) {
            // TODO Auto-generated method stub
            super.onCreate(savedInstanceState);
            setContentView(R.layout.signup);
            setupVariables();
        }

        @Override
        public boolean onCreateOptionsMenu(Menu menu) {
            // Inflate the menu; this adds items to the action bar if it is present.
            // getMenuInflater().inflate(R.menu.signup, menu);
            Button button = (Button) findViewById(R.id.btnSubmitAction);
            button.setOnClickListener(new OnClickListener() {

                @Override
                public void onClick(View view) {
                    Toast.makeText(getApplicationContext(), "Welcome", Toast.LENGTH_SHORT).show();
                    startActivity(new Intent(signupActivity.this, MainActivity.class));
                    finish();
                }
            });
            return true;
        }
    }

    private void setupVariables(){
        setIdNo((EditText) findViewById(R.id.signidno));
        setFullName((EditText) findViewById(R.id.signfname));
        setEmail((EditText) findViewById(R.id.signemail));
        setPassword((EditText) findViewById(R.id.signpassword));
    }

    public EditText getIdNo() {
        return idNo;
    }

    public void setIdNo(EditText idNo) {
        this.idNo = idNo;
    }

    public EditText getFullName() {
        return fullname;
    }

    public void setFullName(EditText fullname) {
        this.fullname = fullname;
    }

    public EditText getEmail() {
        return email;
    }

    public void setEmail(EditText email) {
        this.email = email;
    }

    public EditText getPassword() {
        return password;
    }

    public void setPassword(EditText password) {
        this.password = password;
    }

    public Button getSignup() {
        return signup;
    }

    public void setSignup(Button signup) {
        this.signup = signup;
    }
}

登录xml（转到注册页面的链接）

<TextView
    android:id="@+id/textView2"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_below="@+id/btnLogin"
    android:layout_centerHorizontal="true"
    android:layout_marginTop="14dp"
    android:onClick="onClick"
    android:clickable="true"
    android:text="Sign up if you don&apos;t have an account"
    android:textAppearance="?android:attr/textAppearanceSmall"
    android:textSize="12sp" />

有什么不妥吗？

Answer 1

因此，您的编辑文本中似乎没有提示。你应该尝试这样的事情：

public void setIdNo(EditText idNo, String idNoHint) {
    this.idNo = idNo;
    this.idNo.setHint(idNoHint);
}

然后这样称呼：

setIdNo((EditText) findViewById(R.id.signidno), "Enter ID Number");

Answer 2

您需要将代码移动到父类，没有内部类的目的在您的情况下， signupActivity 没有逻辑，因此它不会显示任何内容。

您只需删除内部类即可解决此问题。

    package com.spamcity;

import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.Menu;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;
import android.view.View.OnClickListener;

public class signupActivity extends Activity {

    private EditText idNo;
    private EditText fullname;
    private EditText email;
    private EditText password;
    private Button signup;

        @Override
        protected void onCreate(Bundle savedInstanceState) {
            // TODO Auto-generated method stub
            super.onCreate(savedInstanceState);
            setContentView(R.layout.signup);
            setupVariables();

            Button button = (Button) findViewById(R.id.btnSubmitAction);
            button.setOnClickListener(new OnClickListener() {
                @Override
                public void onClick(View view) {
                    Toast.makeText(getApplicationContext(), "Welcome", Toast.LENGTH_SHORT).show();
                    startActivity(new Intent(signupActivity.this, MainActivity.class));
                    finish();
                }
            });
        }

    private void setupVariables(){
        setIdNo((EditText) findViewById(R.id.signidno));
        setFullName((EditText) findViewById(R.id.signfname));
        setEmail((EditText) findViewById(R.id.signemail));
        setPassword((EditText) findViewById(R.id.signpassword));
    }

    public EditText getIdNo() {
        return idNo;
    }

    public void setIdNo(EditText idNo) {
        this.idNo = idNo;
    }

    public EditText getFullName() {
        return fullname;
    }

    public void setFullName(EditText fullname) {
        this.fullname = fullname;
    }

    public EditText getEmail() {
        return email;
    }

    public void setEmail(EditText email) {
        this.email = email;
    }

    public EditText getPassword() {
        return password;
    }

    public void setPassword(EditText password) {
        this.password = password;
    }

    public Button getSignup() {
        return signup;
    }

    public void setSignup(Button signup) {
        this.signup = signup;
    }    
}

让我知道它是否有效！

Android：它显示的是黑色空白页面（带操作栏），而不是下一页

2 个答案: