我想要做的是检查多个字符串是否为空以便转到下一个活动,如下所示:
if( string1.equal(null) && ... stringN.equal(null))
{ Toast.makeText(this, "something is empty", Toast.LENGTH_SHORT).show();}
else
{ GO TO THE NEXT ACTIVITY}
所有的字符串都必须有内容......任何帮助都会很棒
如果你有一个可变数量的字符串来检查我会做如下的事情:
private boolean validate(String... items) {
for (String item : items) {
if (TextUtils.isEmpty(item)) {
return false;
}
}
return true;
}
然后,您的代码将使用您需要验证的字符串调用validate方法:
if (validate(string1, string2, stringN)) {
Toast.makeText(this, "something is empty", Toast.LENGTH_SHORT).show();
} else {
// GO TO THE NEXT ACTIVITY
}
如果您的字符串在List或Array中,那么您可以迭代它们。
如果使用ArrayList:
private boolean verify(final ArrayList<String> list)
{
for (String entry : list)
{
if (TextUtils.isEmpty(entry))
return false;
}
return true;
}
或者如果使用数组,同样的事情只是将参数更改为String []:
private boolean verify(final String[] list)
{
for (String entry : list)
{
if (TextUtils.isEmpty(entry))
return false;
}
return true;
}
你也可以这样做:
private String[] array;
private String one = "one";
private String two = "two";
private String three = "three";
private String four = "four";
private String five = "five";
private void someMethod(){
if(isStringsNotNull(getStringArray())){
//Start another activity
} else {
//Do something
}
}
private String[] getStringArray(){
return new String[]{one, two, three, four, five};
}
private Boolean isStringsNotNull(String[] array){
for(String str: array){
if(str == null){
return false;
}
}
return true;
}
很好的答案@PerracoLabs,但isEmpty只检查长度是否为0.不是吗?
如果您使用的是java8 / lambda,可以尝试使用此函数:
List<String> stringList = new ArrayList<>(Arrays.asList(string2.split(" "))); // Split the string into list
// compare the list with the source of the string, if match put into the list of result
List<String> result = stringList.stream().filter(new Predicate<String>() {
@Override
public boolean test(String s) {
// return string1.contains(s); // case sensitive
return Pattern.compile(Pattern.quote(s), Pattern.CASE_INSENSITIVE).matcher(string1).find(); // case insensitive
}
}).collect(Collectors.toList());
// check the match results
if(result.size()<stringList.size()){
Log.d("test", "onCreate: not match");
}else{
Log.d("test", "onCreate: match");
}