form disable button if edit-Text is null(empty)

i need help i made this form that sends user text data into Firebase-real-time database by a button and few edit-text but i need some form security so that users can't just enter blank data i have tried but can't get it to work i do need help just like a button disable or alert that tells the user to enter some text
best regards.

xml:

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout 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=".MainActivity">
<TextView
android:background="#F9B101"
android:layout_width="match_parent"
android:layout_height="50dp"
android:text="Buyers page"
android:textAlignment="center"
android:fontFamily="sans-serif-light"
android:textSize="30sp"
android:gravity="center_horizontal"
android:textColor="#000"/>
<EditText
android:inputType="textPersonName"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:hint="Name"
android:id="@+id/name"
android:layout_marginTop="100dp"
/>
<EditText
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:hint="Address"
android:id="@+id/address"
android:layout_marginTop="150dp"
/>
<EditText
android:inputType="phone"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:hint="phone number"
android:id="@+id/phoneNumber"
android:layout_marginTop="200dp"
/>
<EditText
android:inputType="textEmailAddress"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:hint="email address"
android:id="@+id/email"
android:layout_marginTop="250dp"
/>
<Button
android:id="@+id/order"
android:layout_width="100dp"
android:layout_height="wrap_content"
android:text="order"
android:layout_marginBottom="10dp"
android:layout_alignParentBottom="true"
android:layout_centerHorizontal="true"
android:background="#F9B101"
android:textColor="#696969"
android:textSize="20sp"
android:textStyle="bold"
/>
</RelativeLayout>

java:

public class MainActivity extends AppCompatActivity {
private EditText name,address,phoneNumber,email;
private Button order;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
name = findViewById(R.id.name);
address = findViewById(R.id.address);
phoneNumber = findViewById(R.id.phoneNumber);
email = findViewById(R.id.email);
order = findViewById(R.id.order); //button
order.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
HashMap<String,Object> map = new HashMap<>();
map.put("name",name.getText().toString());
map.put("address",address.getText().toString());
map.put("phoneNumber",phoneNumber.getText().toString());
map.put("email",email.getText().toString());
FirebaseDatabase.getInstance().getReference().child("Orders").push()
.setValue(map)
.addOnCompleteListener(new OnCompleteListener<Void>() {
@Override
public void onComplete(@NonNull Task<Void> task) {
Toast.makeText(MainActivity.this, "Order is processing...", Toast.LENGTH_SHORT).show();
startActivity(new Intent(MainActivity.this, SuccessActivity.class));
}
}).addOnFailureListener(new OnFailureListener() {
@Override
public void onFailure(@NonNull Exception e) {
Toast.makeText(MainActivity.this, "Order Failed", Toast.LENGTH_LONG).show();
}
});
}
});
}
@Override
public void onWindowFocusChanged(boolean hasFocus) {
super.onWindowFocusChanged(hasFocus);
if (hasFocus) {
hideSystemUI();
}
}
private void hideSystemUI() {
// Enables regular immersive mode.
// For "lean back" mode, remove SYSTEM_UI_FLAG_IMMERSIVE.
// Or for "sticky immersive," replace it with SYSTEM_UI_FLAG_IMMERSIVE_STICKY
View decorView = getWindow().getDecorView();
decorView.setSystemUiVisibility(
View.SYSTEM_UI_FLAG_IMMERSIVE
// Set the content to appear under the system bars so that the
// content doesn't resize when the system bars hide and show.
| View.SYSTEM_UI_FLAG_LAYOUT_STABLE
| View.SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION
| View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN
// Hide the nav bar and status bar
| View.SYSTEM_UI_FLAG_HIDE_NAVIGATION
| View.SYSTEM_UI_FLAG_FULLSCREEN);
}
// Shows the system bars by removing all the flags
// except for the ones that make the content appear under the system bars.
private void showSystemUI() {
View decorView = getWindow().getDecorView();
decorView.setSystemUiVisibility(
View.SYSTEM_UI_FLAG_LAYOUT_STABLE
| View.SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION
| View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN);
}
}
</details>
# 答案1
**得分**: 0
你可以通过检查以下方式来验证编辑文本数据是否为空：
```java
if (name.getText().toString() != "")

这样，你可以在 else 部分显示一个弹出窗口，指示字段为空。

if(name.getText().toString()!="")

答案2

得分: 0

你可以检查文本字段是否为空，然后显示一个类似这样的提示：

if (name.getText().toString().equals("")) {
    Toast.makeText(getActivity(), "请填写您的姓名",
        Toast.LENGTH_LONG).show();
} else {
    // 发送姓名
}

如果需要的话，你也可以在姓名字段为空时禁用按钮，但我认为显示一个提示更好，这样用户就知道该怎么做。这更加用户友好。如果出于任何原因你想禁用按钮，你可以在你的if语句中使用以下代码：

yourButton.setEnabled(false); // yourButton是你按钮的名称！

if(name.getText().toString().equals(""){
Toast.makeText(getActivity(), "Please Enter Your Name",
Toast.LENGTH_LONG).show();
}
else{
//Send the name
}

yourButton.setEnabled(false); // yourButton is the name of your button!