问题
I am developing a application in which if i click a button it woul d check that all the edit text are empty or something written and providing similar alert box for that message.I had made a method and calling it in Onclick event.But i am not able to get the desired result as syntax error is not dr even logcat not showing any error please help me out...Thanks in advance..
ImageButton b2=(ImageButton)findViewById(R.id.imageButton2);
b2.setOnClickListener(new OnClickListener()
{
@Override
public void onClick(View arg0) {
checkValue();
}
private void checkValue() {
EditText e = (EditText) findViewById(R.id.editText1);
EditText e1 = (EditText) findViewById(R.id.editText2);
EditText e2 = (EditText) findViewById(R.id.editText3);
EditText e3 = (EditText) findViewById(R.id.editText4);
EditText e4 = (EditText) findViewById(R.id.editText5);
EditText e5 = (EditText) findViewById(R.id.editText6);
String f = e.getText().toString();
String f1 = e1.getText().toString();
String f2 = e2.getText().toString();
String f3 = e3.getText().toString();
String f4 = e4.getText().toString();
String f5 = e5.getText().toString();
if ((f.length()>0)&&(f1.length()>0)&&(f2.length()>0)&&(f3.length()>0)&&(f4.length()>0)&&(f5.length()>0)) {
AlertDialog alert= new AlertDialog.Builder(Test.this).create();
alert.setTitle("Exception:Incomplete Form");
alert.setMessage("Looks like you missed a field or made a mistake.Please ensure all fields of form are filled.Click OK to go to main page");
alert.setButton("OK", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int which) {
Intent i=new Intent(Test.this,ShpoonkleActivity.class);
} });
}
else
{
AlertDialog alert= new AlertDialog.Builder(Test.this).create();
alert.setTitle("Your Form is successfully processed.Thanks");
alert.setMessage("You are Done! Keep an eye out for a confirmation email. If you don't get one in the next 24h, open this form again, and make sure youremail is correct");
}
}
});
}
}
回答1:
you can try this :
if ((f.trim().equals('') || (f1.trim().equals('') ||........) {
// Error , one or more editText are empty
}
else
{
// all editText are not empty
}
回答2:
// Edit
I think you have it the wrong way, where your if statment is when every is filled in, your else when one of the fields is empty
---- previous answer ----
You can do it like this.
if(editText.getText().toString().length() > 0) {
// editText is not empty
}
if(editText.getText().toString().length() == 0) {
// editText is empty
}
回答3:
Mats and Houcine answers are valid but you can even do shorter using isEmpty():
if(editText.getText().toString().isEmpty()) {
// editText is empty
} else {
// editText is not empty
}
来源：https://stackoverflow.com/questions/7965411/how-to-check-edit-text-is-empty