public abstract class BaseActivity extends Activity{@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);initVariables();initViews(savedInstanceState);initState();}//初始化变量protected abstract void initVariables();//初始化控件protected abstract void initViews(Bundle savedInstanceState);/*** 动态的设置状态栏  实现沉浸式状态栏**/private void initState() {getWindow().addFlags(WindowManager.LayoutParams.FLAG_TRANSLUCENT_STATUS);if(Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT){//4.4 全透明状态栏
            getWindow().addFlags(WindowManager.LayoutParams.FLAG_TRANSLUCENT_STATUS);}if(Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {//5.0 全透明实现Window window = getWindow();window.clearFlags(WindowManager.LayoutParams.FLAG_TRANSLUCENT_STATUS);window.getDecorView().setSystemUiVisibility(View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN| View.SYSTEM_UI_FLAG_LAYOUT_STABLE);window.addFlags(WindowManager.LayoutParams.FLAG_DRAWS_SYSTEM_BAR_BACKGROUNDS);window.setStatusBarColor(Color.TRANSPARENT);//calculateStatusColor(Color.WHITE, (int) alphaValue)
        }}
}

public class LoginActivity extends BaseActivity {@Overrideprotected void initVariables() {}@Overrideprotected void initViews(Bundle savedInstanceState) {setContentView(R.layout.activity_login);}
}

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"android:orientation="vertical"android:layout_width="match_parent"android:layout_height="match_parent"android:background="#666666"><TextViewandroid:layout_width="wrap_content"android:layout_height="wrap_content"android:text="登录界面"android:layout_centerInParent="true"/>
</RelativeLayout>