问题
I need to catch when an EditText
loses focus, I've searched other questions but I didn't find an answer.
I used OnFocusChangeListener
like this
OnFocusChangeListener foco = new OnFocusChangeListener() {
@Override
public void onFocusChange(View v, boolean hasFocus) {
// TODO Auto-generated method stub
}
};
But, it doesn't work for me.
回答1:
Implement onFocusChange
of setOnFocusChangeListener
and there's a boolean parameter for hasFocus. When this is false, you've lost focus to another control.
EditText txtEdit = (EditText) findViewById(R.id.edittxt);
txtEdit.setOnFocusChangeListener(new OnFocusChangeListener() {
@Override
public void onFocusChange(View v, boolean hasFocus) {
if (!hasFocus) {
// code to execute when EditText loses focus
}
}
});
回答2:
Have your Activity
implement OnFocusChangeListener()
if you want a factorized use of this interface,
example:
public class Shops extends AppCompatActivity implements View.OnFocusChangeListener{
In your OnCreate
you can add a listener for example:
editTextResearch.setOnFocusChangeListener(this);
editTextMyWords.setOnFocusChangeListener(this);
editTextPhone.setOnFocusChangeListener(this);
then android studio will prompt you to add the method from the interface, accept it... it will be like:
@Override
public void onFocusChange(View v, boolean hasFocus) {
// todo your code here...
}
and as you've got a factorized code, you'll just have to do that:
@Override
public void onFocusChange(View v, boolean hasFocus) {
if (hasFocus) {
editTextResearch.setText("");
editTextMyWords.setText("");
editTextPhone.setText("");
}
if (!hasFocus){
editTextResearch.setText("BlaBlaBla");
editTextMyWords.setText(" One Two Tree!");
editTextPhone.setText("\"your phone here:\"");
}
}
anything you code in the !hasFocus
is for the behavior of the item that loses focus, that should do the trick! But beware that in such state, the change of focus might overwrite the user's entries!
回答3:
Kotlin way
editText.setOnFocusChangeListener { _, hasFocus ->
if (!hasFocus) { }
}
回答4:
Its Working Properly
EditText et_mobile= (EditText) findViewById(R.id.edittxt);
et_mobile.setOnFocusChangeListener(new OnFocusChangeListener() {
@Override
public void onFocusChange(View v, boolean hasFocus) {
if (hasFocus) {
// code to execute when EditText loses focus
if (et_mobile.getText().toString().trim().length() == 0) {
CommonMethod.showAlert("Please enter name", FeedbackSubmtActivity.this);
}
}
}
});
public static void showAlert(String message, Activity context) {
final AlertDialog.Builder builder = new AlertDialog.Builder(context);
builder.setMessage(message).setCancelable(false)
.setPositiveButton("OK", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int id) {
}
});
try {
builder.show();
} catch (Exception e) {
e.printStackTrace();
}
}
回答5:
Using Java 8 lambda expression:
editText.setOnFocusChangeListener((v, hasFocus) -> {
if(!hasFocus) {
String value = String.valueOf( editText.getText() );
}
});
来源:https://stackoverflow.com/questions/10627137/how-can-i-know-when-an-edittext-loses-focus