安卓获取线程id

错误的做法：

     @Override
     public void onCreate() {
         mContext = getApplicationContext();
         mHandler = new Handler();
         mMainThreadid = android.os.Process.myPid();
         super.onCreate();
     }

正确的做法：

     @Override
     public void onCreate() {
         mContext = getApplicationContext();
         mHandler = new Handler();
         mMainThreadid = android.os.Process.myTid();
         super.onCreate();
     }