SharedPreferences setting = getSharedPreferences(SHARE_APP_TAG, 0);Boolean user_first = setting.getBoolean("FIRST",true);if(user_first){
   //第一次      setting.edit().putBoolean("FIRST", false).commit();      Toast.makeText(MainActivity.this, "第一次", Toast.LENGTH_LONG).show(); }else{     Toast.makeText(MainActivity.this, "不是第一次", Toast.LENGTH_LONG).show();}