跳转Activity时清除当前Activity

    void GotoMainActivity(){

        Intent intent = new Intent(ProductionInformationActivity.this, MainActivity.class);

        //跳到MainActivity时清除掉ProductionInformationActivity

        intent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TASK | Intent.FLAG_ACTIVITY_NEW_TASK);

        startActivity(intent);

    }