单击

Question

我是android开发的新手。我正在尝试制作一个简单的登录和注册表格。我有一个TextView'Sign up'，基本上在单击时会将用户带到registerActivity，但是每次我单击注册TextView时，它都会使我的应用程序崩溃。我已经搜索了解决方案，但似乎无法找出导致崩溃的原因。

XML：

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout 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=".LoginActivity"
android:orientation="vertical"
android:gravity="center_horizontal"
android:background="@drawable/bg"
>

<ImageView
    android:layout_width="wrap_content"
    android:layout_height="200dp"
    android:layout_marginTop="70dp"
    app:srcCompat="@drawable/logo"
    />

<EditText
    android:id="@+id/edittext_username"
    android:layout_width="249dp"
    android:layout_height="71dp"
    android:layout_marginTop="20dp"
    android:drawableLeft="@drawable/user"
    android:drawablePadding="10dp"
    android:textColorHint="#f8f8f8"
    android:paddingLeft="15dp"
    android:hint="@string/mobile"
    android:textColor="#f8f8f8"
    android:background="@drawable/rounded_edittext" />

<EditText
    android:id="@+id/edittext_password"
    android:layout_width="249dp"
    android:layout_height="71dp"
    android:layout_marginTop="20dp"
    android:drawableLeft="@drawable/password"
    android:drawablePadding="10dp"
    android:textColorHint="#f8f8f8"
    android:paddingLeft="15dp"
    android:hint="@string/password"
    android:textColor="#f8f8f8"
    android:background="@drawable/rounded_edittext"/>

<Button
    android:id="@+id/button_login"
    android:layout_width="wrap_content"
    android:layout_height="40dp"
    android:layout_marginTop="20dp"
    android:background="@drawable/rounded_buttons"
    android:text="@string/login"

    />
<LinearLayout
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:orientation="horizontal"
    android:layout_marginTop="20dp">

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="35dp"
        android:text="Not Registered?"
        android:textColor="#000000" />

    <TextView
        android:id="@+id/textview_register"
        android:layout_width="wrap_content"
        android:layout_height="35dp"
        android:paddingLeft="5dp"
        android:textStyle="bold"
        android:textColor="#e8170c"
        android:text="@string/register"/>

</LinearLayout>

JAVA：

package com.example.careerhunts.raw;

import android.content.Intent;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.view.Window;
import android.view.WindowManager;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;

public class LoginActivity extends AppCompatActivity {

EditText mTextUsername;
EditText mTextPassword;
Button mButtonLogin;
TextView mTextViewRegister;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    requestWindowFeature(Window.FEATURE_NO_TITLE); //will hide the title
    getSupportActionBar().hide(); // hide the title bar
    this.getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,
            WindowManager.LayoutParams.FLAG_FULLSCREEN); //enable full 
    screen
    setContentView(R.layout.activity_login);

    mTextUsername = findViewById(R.id.edittext_username);
    mTextPassword = findViewById(R.id.edittext_password);
    mButtonLogin = findViewById(R.id.button_login);
    mTextViewRegister = findViewById(R.id.textview_register);

    mTextViewRegister.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            Intent registerIntent = new Intent(LoginActivity.this, 
    RegisterActivity.class);
            startActivity(registerIntent);

        }
    });

}
}

Answer 1

我测试了相同的代码，通过猜测我可以判断出您可能错拼了activity_login的名称（可能是您分配了不具有名为textview_register的文本视图的其他布局），或者是您没有名为RegisterActivity.class的活动