1.解決頂部問題：

用這兩個屬性 使介面佈局放在狀態列的下面 避免與狀態列重合造成actionbar太過於靠上！！！（如上圖頂部效果）
android:clipToPadding="true"
android:fitsSystemWindows="true"

private void setStaus() {
    if(Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
        Window window = getWindow();
        window.clearFlags(WindowManager.LayoutParams.FLAG_TRANSLUCENT_STATUS 
 
| WindowManager.LayoutParams.FLAG_TRANSLUCENT_NAVIGATION);
        window.getDecorView().setSystemUiVisibility(View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN
| View.SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION | View.SYSTEM_UI_FLAG_LAYOUT_STABLE);
        window.addFlags(WindowManager.LayoutParams.FLAG_DRAWS_SYSTEM_BAR_BACKGROUNDS
 
);
        window.setStatusBarColor(Color.TRANSPARENT);
        window.setNavigationBarColor(Color.TRANSPARENT);
    }
}

rl_bar_title這個佈局是空的linnearLayout 放到headview的上面

protected void setStatusBar() {
    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT) {
        final ViewGroup linear_bar = (ViewGroup) findViewById(R.id.rl_bar_title
 
);
        final int statusHeight = getStatusBarHeight();
        linear_bar.post(new Runnable() {
            @Override
public void run() {
                int titleHeight = linear_bar.getHeight();
                android.widget.LinearLayout.LayoutParams params = (android.widget.LinearLayout.LayoutParams) linear_bar.getLayoutParams();
                params.height = statusHeight + titleHeight;
                linear_bar.setLayoutParams(params);
            }
        });
    }
}

通過反射獲取

public int getStatusBarHeight(){
    if(statusBarHeight==0){
        Class<?> c;
        try
        {
            c = Class.forName("com.android.internal.R$dimen");
            Object o = c.newInstance();
            Field field = c.getField("status_bar_height");
            int x = (Integer) field.get(o);
            statusBarHeight = getResources().getDimensionPixelSize(x);
        }catch(Exception e)
        {
            e.printStackTrace();
        }
    }
    return statusBarHeight;
}

根據資源ID獲取

public int getStatusBarHeight1(){
    if(statusBarHeight==0){
        int resourceId = getResources().getIdentifier("status_bar_height", "dimen", "android");
        if(resourceId>0){
            statusBarHeight = getResources().getDimensionPixelSize(resourceId);
        }
    }
    return statusBarHeight;
}

通過當前視窗物件獲取，貌似有侷限性

public int getStatusBarHeight2(){
    if(statusBarHeight==0){
        Rect rect = new Rect();
        Window window = getWindow();
        window.getDecorView().getWindowVisibleDisplayFrame(rect);
        statusBarHeight = rect.top;
    }
    return statusBarHeight;
}