Android4.4新特性，系统状态栏一体化。

实现的步骤主要有以下几点：

1.android4.4 以上版本

2.设置app全屏

/**     * 设置状态栏背景状态     */

protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT) {
           setTranslucentStatus(true);
           SystemBarTintManager tintManager = new SystemBarTintManager(this);
           tintManager.setStatusBarTintEnabled(true);
           tintManager.setStatusBarTintResource(R.color.top_bg_color);//通知栏所需颜色
       }
    setContentView(R.layout.main_activity);
}

@TargetApi(19)
   private void setTranslucentStatus(boolean on) {
       Window win = getWindow();
       WindowManager.LayoutParams winParams = win.getAttributes();
       final int bits = WindowManager.LayoutParams.FLAG_TRANSLUCENT_STATUS;
       if (on) {
           winParams.flags |= bits;
       } else {
           winParams.flags &= ~bits;
       }
       win.setAttributes(winParams);
   }

3.布局文件中设置

注意在activity的layout上设置两个属性：     android:clipToPadding="false"     android:fitsSystemWindows="true"

4.