发送密码重置电子邮件方法使应用程序崩溃

Question

我正在尝试进行忘记密码活动，其中有一个 EditText 字段供用户输入他们的电子邮件并单击一个按钮，然后将调用 sendPasswordResetEmail() 方法......所以我拥有的代码是这个

mAuth = FirebaseAuth.getInstance();
resetPasswordBtn = (Button)findViewById(R.id.resetPasswordButton);
resetPasswordFld = (EditText)findViewById(R.id.resetPasswordField);

final String email = resetPasswordFld.getText().toString().trim();

resetPasswordBtn.setOnClickListener(new View.OnClickListener() {
    @Override
    public void onClick(View view) {
        mAuth.sendPasswordResetEmail(email)
                .addOnCompleteListener(new OnCompleteListener<Void>() {
                    @Override
                    public void onComplete(@NonNull Task<Void> task) {
                        if (task.isSuccessful()) {
                            Toast.makeText(ResetPassword.this, "e-mail buat reset password sudah dikirimkan",Toast.LENGTH_LONG).show();
                            Intent loginIntent = new Intent (ResetPassword.this, LoginActivity.class);
                            startActivity(loginIntent);
                        }
                    }
                });
    }
});

当我尝试它时，应用程序崩溃了，我得到了这个错误日志

03-23 16:28:59.829 6990-6990E/UncaughtException: java.lang.IllegalArgumentException: Given String is empty or null
    at com.google.android.gms.common.internal.zzac.zzdv(Unknown Source)
    at com.google.firebase.auth.FirebaseAuth.sendPasswordResetEmail(Unknown Source)
    at com.ResetPassword$1.onClick(ResetPassword.java:37)
    at android.view.View.performClick(View.java:6207)
    at android.widget.TextView.performClick(TextView.java:11094)
    at android.view.View$PerformClick.run(View.java:23639)
    at android.os.Handler.handleCallback(Handler.java:751)
    at android.os.Handler.dispatchMessage(Handler.java:95)
    at android.os.Looper.loop(Looper.java:154)
    at android.app.ActivityThread.main(ActivityThread.java:6688)
    at java.lang.reflect.Method.invoke(Native Method)
    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1468)
    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1358)
03-23 16:28:59.833 6990-7024 D/FA: Logging event (FE): _ae, Bundle[{_o=crash, _sc=ResetPassword, _si=-8440426569227389093, timestamp=1490261339829, fatal=1}]
03-23 16:29:00.128 6990-6990 E/AndroidRuntime: FATAL EXCEPTION: main
 Process: , PID: 6990
 java.lang.IllegalArgumentException: Given String is empty or null
 at com.google.android.gms.common.internal.zzac.zzdv(Unknown Source)
 at com.google.firebase.auth.FirebaseAuth.sendPasswordResetEmail(Unknown Source)
 at.ResetPassword$1.onClick(ResetPassword.java:37)
 at android.view.View.performClick(View.java:6207)
 at android.widget.TextView.performClick(TextView.java:11094)
 at android.view.View$PerformClick.run(View.java:23639)
 at android.os.Handler.handleCallback(Handler.java:751)
 at android.os.Handler.dispatchMessage(Handler.java:95)
 at android.os.Looper.loop(Looper.java:154)
 at android.app.ActivityThread.main(ActivityThread.java:6688)
 at java.lang.reflect.Method.invoke(Native Method)
 at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1468)
 at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1358)

我实际上确信我做错了，因为 mAuth 肯定会返回 null，因为没有用户登录，对吗？我很难找到关于此的良好文档，而 firebase 文档中的文档并没有真正的帮助。

必须有一种方法可以引用数据库来检查输入的电子邮件地址是否真的存在......但是我的规则阻止未登录的用户访问它们......所以我真的很困惑如何开始吧...

Answer 1

我认为错误来自这一行：

mAuth.sendPasswordResetEmail(email)

因为您将email 标记为final，所以当onClick 发生时它不会更新。而email 的值总是空的，因为起初resetPasswordFld 确实是空的。所以你应该这样做：

// I believe resetPasswordFld is accessible from inside OnClickListener, so

resetPasswordBtn.setOnClickListener(new View.OnClickListener() {
    @Override
    public void onClick(View view) {

        // place this code here, rather than make it final and place it outside
        String email = resetPasswordFld.getText().toString().trim();

        mAuth.sendPasswordResetEmail(email) ...
    }
}