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 Android教程網 >> Android技術 >> 關於Android編程 >> Android判斷Navigation Bar 是否透明

Android判斷Navigation Bar 是否透明

編輯:關於Android編程

設置Navigation Bar 透明

getWindow().addFlags(WindowManager.LayoutParams.FLAG_TRANSLUCENT_NAVIGATION);
或者Theme中添加  true

  /**
     * Convenience function to set the flag bits as specified in flags, as
     * per {@link #setFlags}.
     * @param flags The flag bits to be set.
     * @see #setFlags
     * @see #clearFlags
     */
    public void addFlags(int flags) {
        setFlags(flags, flags);
    }


/**
     * Set the flags of the window, as per the
     * {@link WindowManager.LayoutParams WindowManager.LayoutParams}
     * flags.
     * 
     * 

Note that some flags must be set before the window decoration is * created (by the first call to * {@link #setContentView(View, android.view.ViewGroup.LayoutParams)} or * {@link #getDecorView()}: * {@link WindowManager.LayoutParams#FLAG_LAYOUT_IN_SCREEN} and * {@link WindowManager.LayoutParams#FLAG_LAYOUT_INSET_DECOR}. These * will be set for you based on the {@link android.R.attr#windowIsFloating} * attribute. * * @param flags The new window flags (see WindowManager.LayoutParams). * @param mask Which of the window flag bits to modify. * @see #addFlags * @see #clearFlags */ public void setFlags(int flags, int mask) { final WindowManager.LayoutParams attrs = getAttributes(); attrs.flags = (attrs.flags&~mask) | (flags&mask); if ((mask&WindowManager.LayoutParams.FLAG_NEEDS_MENU_KEY) != 0) { attrs.privateFlags |= WindowManager.LayoutParams.PRIVATE_FLAG_SET_NEEDS_MENU_KEY; } mForcedWindowFlags |= mask; if (mCallback != null) { mCallback.onWindowAttributesChanged(attrs); } }


其中:
attrs.flags = (attrs.flags&~mask) | (flags&mask);

誰能給解釋一下這行代碼的意思?以前學的都忘記了

so

	public boolean existFlag(int flags){
	    WindowManager.LayoutParams attrs= getWindow().getAttributes();
	    if(attrs.flags ==( (attrs.flags&~flags) | (flags&flags))){
	    	return true;
	    }
	    return false;
	}

KitKat上驗證通過。


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