抽取基类 BaseActivity

public abstract class BaseActivity<P extends BasePresenter> extends AppCompatActivity implements IBaseView {
    public  P presenter;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        //沉浸式
        if (Build.VERSION.SDK_INT >= 21) {
            View decorView = getWindow().getDecorView();
            int option = View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN
                    | View.SYSTEM_UI_FLAG_LAYOUT_STABLE;
            decorView.setSystemUiVisibility(option);
            getWindow().setStatusBarColor(Color.TRANSPARENT);
        }
        ActionBar actionBar = getSupportActionBar();
        
        setContentView(setChildContentView());
        initView();
        initDataBase();
        initData();
    }
    public P getPresenter(){
        return presenter;
    }
    private void initDataBase() {
          presenter=setBasePresenter();
          if(presenter!=null){
                presenter.attchView(this);
          }else {
            try {
                throw  new Exception("兄弟 prenter 没有设置 请在您的Activity 创建 presenter！！！");
            } catch (Exception e) {
                e.printStackTrace();
            }
        }
    }
  
    abstract void initView();
    abstract void initData();
    abstract  P setBasePresenter();
    abstract  int setChildContentView();
}