Question

你好我点击我的按钮时出现了奇怪的错误。之前它运作良好：它停止工作，我不知道为什么。你能帮我吗？这是代码：

public void onClick(View view) {
    switch (view.getId()) {
        case R.id.bPrisijungti:
            String elpastas = etElpastas.getText().toString();
            String slaptazodis = etSlaptazodis.getText().toString();

            User user = new User(elpastas, slaptazodis,"","","");

            authenticate(user);
            break;
        case R.id.tvRegistracija:
            Intent registerIntent = new Intent(Login.this, Register.class);
            startActivity(registerIntent);
            break;
    }
}

我在String elpastas上收到错误......

xml：

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:padding="10dp"
    android:orientation="vertical"
    android:layout_height="match_parent">


    <TextView
        android:text="El paštas"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content" />

    <EditText
        android:id="@+id/etelpastas"
        android:layout_width="match_parent"
        android:layout_marginBottom="10dp"
        android:layout_height="wrap_content" />

    <TextView
        android:text="Slaptažodis"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content" />

    <EditText
        android:id="@+id/etSlaptazodis"
        android:layout_width="match_parent"
        android:inputType="textPassword"
        android:layout_marginBottom="10dp"
        android:layout_height="wrap_content" />

    <Button
        android:id="@+id/bPrisijungti"
        android:layout_width="match_parent"
        android:layout_marginBottom="10dp"
        android:layout_height="wrap_content"
        android:text="Prisijungti" />

    <TextView
        android:id="@+id/tvRegistracija"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="center_horizontal"
        android:text="Naujas vartotojas"
        android:textStyle="bold" />

</LinearLayout>

Logcat：

05-25 21:04:57.094    9100-9100/com.tonikamitv.loginregister D/OpenGLRenderer﹕ Enabling debug mode 0
05-25 21:04:58.384    9100-9100/com.tonikamitv.loginregister D/AndroidRuntime﹕ Shutting down VM
05-25 21:04:58.384    9100-9100/com.tonikamitv.loginregister W/dalvikvm﹕ threadid=1: thread exiting with uncaught exception (group=0x41241438)
05-25 21:04:58.424    9100-9100/com.tonikamitv.loginregister E/AndroidRuntime﹕ FATAL EXCEPTION: main
    java.lang.NullPointerException
            at com.tonikamitv.loginregister.Login.onClick(Login.java:40)
            at android.view.View.performClick(View.java:4191)
            at android.view.View$PerformClick.run(View.java:17229)
            at android.os.Handler.handleCallback(Handler.java:615)
            at android.os.Handler.dispatchMessage(Handler.java:92)
            at android.os.Looper.loop(Looper.java:137)
            at android.app.ActivityThread.main(ActivityThread.java:4960)
            at java.lang.reflect.Method.invokeNative(Native Method)
            at java.lang.reflect.Method.invoke(Method.java:511)
            at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1038)
            at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:805)
            at dalvik.system.NativeStart.main(Native Method)

Answer 1

你是否在onclick之前完成了这项工作。我认为这是根本原因。

EditText etElpastas=(EditText)findViewById(R.id.etelpastas);

Java致命异常onClick

1 个答案: