您可以使用类似TextUtils的类进行检查

You can check using the TextUtils class like

TextUtils.isEmpty(ed_text);

或者您可以像这样检查:

or you can check like this:

EditText ed = (EditText) findViewById(R.id.age);

String ed_text = ed.getText().toString().trim();

if(ed_text.isEmpty() || ed_text.length() == 0 || ed_text.equals("") || ed_text == null)
{
    //EditText is empty
}
else
{
    //EditText is not empty
}