小编use*_*389的帖子

我正在尝试使用AsyncTask(学习),获取致命异常错误这是调用

        String username = usr_number.getText().toString();
        String password = password_main.getText().toString();
        String[] Loginvalues = {username,password};

        new CheckUsername().execute(Loginvalues);

这就是班级

public class CheckUsername extends AsyncTask<String[], Integer, String[]>{

    @Override
    protected String[] doInBackground(String[]... params) {
        // TODO Auto-generated method stub
        String username = params[0].toString();
        String password = params[1].toString();
        System.out.println(username);
        System.out.println(password);
        return null;
    }

}

这是我得到的错误

05-09 03:11:04.428: E/AndroidRuntime(1139): FATAL EXCEPTION: AsyncTask #1
05-09 03:11:04.428: E/AndroidRuntime(1139): Process: com.hexwhale.pocketcollege, PID: 1139
05-09 03:11:04.428: E/AndroidRuntime(1139): java.lang.RuntimeException: An error occured while executing doInBackground()
05-09 03:11:04.428: E/AndroidRuntime(1139):     at android.os.AsyncTask$3.done(AsyncTask.java:300)
05-09 03:11:04.428: …