问题
I want to show error if the user enters blank value in the edittext.But i am not getting the way how could i do this .This is how i want like this:
This is my xml that i have created
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:orientation="horizontal" >
<LinearLayout
android:id="@+id/headerLayout"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_alignParentTop="true"
android:background="@drawable/top_bg"
android:orientation="horizontal" >
<ImageView
android:id="@+id/back_button"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginLeft="10dp"
android:layout_marginTop="5dp"
android:src="@drawable/back_button" />
<TextView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginLeft="75dp"
android:layout_marginTop="10dp"
android:text="Traveller Details"
android:textColor="@android:color/white" />
</LinearLayout>
<LinearLayout
android:id="@+id/tittleLayout"
android:layout_below="@+id/headerLayout"
android:layout_height="wrap_content"
android:layout_width="fill_parent"
android:orientation="vertical" >
<TextView
android:id="@+id/TittleTravellerDetails"
android:layout_width="wrap_content"
android:layout_height="match_parent"
android:layout_marginLeft="10dp"
android:layout_marginTop="5dp"
android:gravity="left"
android:text="Traveller Details" />
<View
android:layout_width="wrap_content"
android:layout_height="2dip"
android:layout_marginTop="2dp"
android:background="#FF909090" />
</LinearLayout>
<LinearLayout
android:id="@+id/passengerDetails"
android:layout_below="@+id/tittleLayout"
android:layout_height="wrap_content"
android:layout_width="fill_parent"
android:orientation="vertical">
<Spinner
android:id="@+id/Tittle"
android:layout_width="290dp"
android:layout_marginLeft="5dp"
android:layout_marginTop="5dp"
android:layout_height="wrap_content"/>
<EditText
android:id="@+id/firstName"
android:layout_width="290dp"
android:layout_height="wrap_content"
android:layout_marginLeft="5dp"
android:layout_marginTop="5dp"
android:hint="First Name" />
<EditText
android:id="@+id/LastName"
android:layout_width="290dp"
android:layout_height="wrap_content"
android:layout_marginLeft="5dp"
android:layout_marginTop="5dp"
android:hint="Last Name" />
</LinearLayout>
<LinearLayout
android:id="@+id/ContactDetailsLayout"
android:layout_below="@+id/passengerDetails"
android:layout_height="wrap_content"
android:layout_width="fill_parent"
android:layout_marginTop="10dp"
android:orientation="vertical" >
<TextView
android:id="@+id/TittleContactDetails"
android:layout_width="wrap_content"
android:layout_height="match_parent"
android:layout_marginLeft="10dp"
android:layout_marginTop="5dp"
android:gravity="left"
android:text="ContactDetails" />
<View
android:layout_width="wrap_content"
android:layout_height="2dip"
android:layout_marginTop="2dp"
android:background="#FF909090" />
</LinearLayout>
<LinearLayout
android:id="@+id/mobileEmailDetails"
android:layout_below="@+id/ContactDetailsLayout"
android:layout_height="wrap_content"
android:layout_width="fill_parent"
android:orientation="vertical">
<EditText
android:id="@+id/mobileNumber"
android:layout_width="290dp"
android:layout_height="wrap_content"
android:layout_marginLeft="5dp"
android:layout_marginTop="5dp"
android:inputType="number"
android:hint="Mobile No" />
<TextView
android:id="@+id/emailid"
android:layout_width="284dp"
android:layout_height="wrap_content"
android:layout_marginLeft="8dp"
android:layout_marginTop="5dp"
android:hint="Email ID" />
</LinearLayout>
<LinearLayout
android:id="@+id/continueBooking"
android:layout_below="@+id/mobileEmailDetails"
android:layout_height="wrap_content"
android:layout_width="fill_parent"
android:orientation="vertical">
<ImageView
android:id="@+id/continuebooking"
android:layout_width="wrap_content"
android:layout_height="match_parent"
android:layout_marginLeft="20dp"
android:layout_marginTop="25dp"
android:src="@drawable/continue" />
</LinearLayout>
</RelativeLayout>
Activity Code
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
requestWindowFeature(Window.FEATURE_NO_TITLE);
setContentView(R.layout.activity_main);
emailId = (TextView)findViewById(R.id.emailid);
continuebooking = (ImageView)findViewById(R.id.continuebooking);
firstName= (EditText)findViewById(R.id.firstName);
emailId.setText("gauravthethinker@gmail.com");
setTittle();
continuebooking.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View arg0) {
if(firstName.getText().toString().trim().equalsIgnoreCase("")){
firstName.setError("Enter FirstName");
}
}
});
}
So ,if the user don't enter his first name i want to show a error like the image that u have not entered any name something like that.Please help me i am new in android.Thanks
回答1:
You can show error as PopUp of EditText
if (editText.getText().toString().trim().equalsIgnoreCase("")) {
editText.setError("This field can not be blank");
}
and that will be look a like as follows
firstName.addTextChangedListener(new TextWatcher() {
@Override
public void onTextChanged(CharSequence s, int start, int before, int count) {
}
@Override
public void beforeTextChanged(CharSequence s, int start, int count, int after) {
}
@Override
public void afterTextChanged(Editable s) {
if (firstName.getText().toString().length <= 0) {
firstName.setError("Enter FirstName");
} else {
firstName.setError(null);
}
}
});
回答2:
private void showError() {
mEditText.setError("Password and username didn't match");
}
Which will result in errors shown like this:
And if you want to remove it:
textView.setError(null);
回答3:
I got the solution of my problem Hope this will help others also.I have used onTextChnaged it invokes When an object of a type is attached to an Editable, its methods will be called when the text is changed.
public class MainActivity extends Activity {
TextView emailId;
ImageView continuebooking;
EditText firstName;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
requestWindowFeature(Window.FEATURE_NO_TITLE);
setContentView(R.layout.activity_main);
emailId = (TextView)findViewById(R.id.emailid);
continuebooking = (ImageView)findViewById(R.id.continuebooking);
firstName= (EditText)findViewById(R.id.firstName);
emailId.setText("test@gmail.com");
setTittle();
continuebooking.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View arg0) {
if(firstName.getText().toString().trim().equalsIgnoreCase("")){
firstName.setError("Enter FirstName");
}
}
});
firstName.addTextChangedListener(new TextWatcher() {
@Override
public void onTextChanged(CharSequence s, int start, int before, int count) {
firstName.setError(null);
}
@Override
public void beforeTextChanged(CharSequence s, int start, int count,
int after) {
// TODO Auto-generated method stub
}
@Override
public void afterTextChanged(Editable s) {
firstName.setError(null);
}
});
}
回答4:
if(TextUtils.isEmpty(firstName.getText().toString()){
firstName.setError("TEXT ERROR HERE");
}
Or you can also use TextInputLayout which has some useful method and some user friendly animation
回答5:
I know it's too late, but in case someone still need help. Here is the working solution.
Setting an error is pretty straight forward. But it will be displayed to user, when he request Focus on it. So to do the both thing on your own, User this code.
firstName.setError("Enter FirstName");
firstName.requestFocus();
回答6:
With youredittext.equals("")you can know if user hasn't entered any letter.
回答7:
Using Kotlin Language,
EXAMPLE CODE
login_ID.setOnClickListener {
if(email_address_Id.text.isEmpty()){
email_address_Id.error = "Please Enter Email Address"
}
if(Password_ID.text.isEmpty()){
Password_ID.error = "Please Enter Password"
}
}
回答8:
you could use an onchange event to trigger a validation and then you can display a toast if this is enough for you
回答9:
You have written your code in onClick event. This will call when you click on EditText. But this is something like you are checking it before entering.
So what my suggestion is, you should use focus changed. When any view get focus, you are setting no error and when focus changed, you check whether there is valid input or not like below.
firstName.setOnFocusChangeListener(new View.OnFocusChangeListener() {
@Override
public void onFocusChange(View arg0, boolean arg1) {
firstName.setError(null);
if (firstName.getText().toString().trim().equalsIgnoreCase("")) {
firstName.setError("Enter FirstName");
}
}
});
回答10:
It seems all you can't get is to show the error at the end of editText. Set your editText width to match that of the parent layout enveloping. Will work just fine.
来源：https://stackoverflow.com/questions/18225365/show-error-on-the-tip-of-the-edit-text-android