设置通知栏的背景颜色或全幅背景

protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
translucentStatusBar(this, false);

}

static void translucentStatusBar(Activity activity, boolean hideStatusBarBackground) {
Window window = activity.getWindow();
//添加Flag把状态栏设为可绘制模式
window.addFlags(WindowManager.LayoutParams.FLAG_DRAWS_SYSTEM_BAR_BACKGROUNDS);
if (hideStatusBarBackground) {
//如果为全透明模式，取消设置Window半透明的Flag
window.clearFlags(WindowManager.LayoutParams.FLAG_TRANSLUCENT_STATUS);
//设置状态栏为透明
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
window.setStatusBarColor(Color.TRANSPARENT);
}
//设置window的状态栏不可见
window.getDecorView().setSystemUiVisibility(View.SYSTEM_UI_FLAG_LAYOUT_STABLE | View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN);
} else {
//如果为半透明模式，添加设置Window半透明的Flag
window.addFlags(WindowManager.LayoutParams.[b]FLAG_TRANSLUCENT_STATUS);
//设置系统状态栏处于可见状态
window.getDecorView().setSystemUiVisibility(View.SYSTEM_UI_FLAG_VISIBLE);
}
//view不根据系统窗口来调整自己的布局
ViewGroup mContentView = (ViewGroup) window.findViewById(Window.ID_ANDROID_CONTENT);
View mChildView = mContentView.getChildAt(0);
if (mChildView != null) {
ViewCompat.setFitsSystemWindows(mChildView, false);
ViewCompat.requestApplyInsets(mChildView);
}
}