android - 发送密码重置电子邮件方法会使应用程序崩溃

Question

我正在尝试忘记密码 Activity ，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...所以我的代码是这样的

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);
                        }
                    }
                });
    }
});

当我尝试时，应用程序崩溃了，我收到了这个错误日志

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确实存在...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从这个开始......

Answer 1

我认为错误来自这一行:

mAuth.sendPasswordResetEmail(email)

并且因为您将 email 标记为 final，它不会在 onClick 发生时更新。而 email 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) ...
    }
}