Question

我想在字段为空时显示吐司。

button1.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View view) {
            aut.signInWithEmailAndPassword(edittext1.getText().toString(), edittext2.getText().toString()).addOnCompleteListener(MainActivity.this, _aut_sign_in_listener);
        }

    });

Answer 1

在此之前

aut.signInWithEmailAndPassword(edittext1.getText().toString(), edittext2.getText().toString()).addOnCompleteListener(MainActivity.this, _aut_sign_in_listener)

尝试如下检查数据是否为空

if (edittext1.getText().toString().isEmpty() || edittext2.getText().toString().isEmpty()) {
    Toast.makeText(this,"fill the required field",Toast.LENGTH_LONG).show();
} else {
    aut.signInWithEmailAndPassword(edittext1.getText().toString(), edittext2.getText().toString()).addOnCompleteListener(MainActivity.this, _aut_sign_in_listener)
}

Answer 2

尝试一下：

当这些字段为空时，请应用此检查：-

if (edittext1.getText().toString().isEmpty()) {

Toast.makeText(getApplicationContext(),"Edit text 1 can not be empty",Toast.LENGTH_LONG).show();

}

else if (edittext2.getText().toString().isEmpty()) {
Toast.makeText(getApplicationContext(),"Edit text 2 can not be empty",Toast.LENGTH_LONG).show();
   }
    else{
     //success code here
        aut.signInWithEmailAndPassword(edittext1.getText().toString(), edittext2.getText().toString()).addOnCompleteListener(MainActivity.this, _aut_sign_in_listener);

    }

Answer 3

“ setError” 代替文本，来编辑文本。会更好

editText.setError("This field can not be blank");

Answer 4

尝试一下

"DatabaseProvider": "MSSQL", //could be MySQL, SQLite etc etc
"ConnectionStrings": {
"MSSQL": "Server=(localdb)\\MSSQLLocalDB;Database=XXX_db;Trusted_Connection=True;MultipleActiveResultSets=true",
"SQLite": "Data Source=XXX_db.db"
 }

当应用程序中的字段为空时敬酒

4 个答案: