我想从我的方法中获取值并将其显示在另一个类中作为敬酒(只是为了确保我的方法正常)。我得到一个空指针异常,我似乎无法弄清楚,我已经尝试了多种不同的事情。我甚至尝试给我的“这个”和“那个”的字符串值。然后我的日志猫告诉我尝试访问类时出现空指针异常
04-05 21:17:29.633:E/AndroidRuntime(18838):java.lang.RuntimeException:无法启动活动ComponentInfo {com.cerealBarApps/com.cerealBarApps.Testing}:android .content.res.Resources $ NotFoundException:字符串资源ID#0x0
这是我想用来运行一切的类。
public class Testing extends Activity {
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
String Testeroni = "This";
String Testerhynocerous = "That";
LoginTest test = new LoginTest();
Toast.makeText(getApplicationContext(), (test.TestUsername(Testeroni)),
Toast.LENGTH_SHORT).show();
Toast.makeText(getApplicationContext(),
(test.TestPassword(Testerhynocerous)), Toast.LENGTH_SHORT)
.show();
}
}
这是我打电话来运行方法的类。
public class LoginTest {
// 0 = Username length is less than 4 or greater than 15
// 1 = Username character is not a letter/or digit
// 9 = Everything is okay in username :)
public int TestUsername(String username) {
if (username.length() <= 4 || username.length() >= 15) {
return 0;
}
for (int i = 0; i < username.length(); i++) {
if (Character.isDigit(username.charAt(i))
|| Character.isJavaLetter(username.charAt(i))) {
System.out.println("");
// Do Nothing
} else
return 1;
}
return 9;
}
// 2 = Passowrd length is less than 4 or greater than 15
// 3 = Password character is not a digit
// 8 = Everything is okay in password :)
public int TestPassword(String password) {
if (password.length() <= 4 || password.length() >= 15) {
return 2;
}
for (int i = 0; i < password.length(); i++) {
if (Character.isDigit(password.charAt(i))
|| Character.isJavaLetter(password.charAt(i))) {
System.out.println("");
// Do Nothing
} else
return 3;
}
return 8;
}
}
Android使用int数据类型作为资源ID,因此您应该将变量 int值为字符串值 – 2012-04-06 01:33:16