增加按鈕可按面積

在設計 ui 時侯因為要遷就版面, 有時按鈕被迫佔用較少位置, 手指頭大的用家當然會按得較吃力, 解決方法好簡單, 使用 TouchDelegates 增大可按面積就可以了:

以下 example 來自: http://www.thomas-manthey.net/2012/03/04/android-basics-using-touchdelegates/

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/** * Adds a touchable padding around a View by constructing a TouchDelegate * and adding it to parent View. * @param parent The "outer" parent View * @param delegate The delegate that handles the TouchEvents * @param topPadding Additional touch area in pixels above View * @param bootomPadding Additional touch area in pixels below View * @param topPadding Additional touch area in pixels left to View * @param topPadding Additional touch area in pixels right to View * @return A runnable that you can post as action to a Views event queue */ private static Runnable getTouchDelegateAction(final View parent, final View delegate, final int topPadding, final int bottomPadding, final int leftPadding, final int rightPadding) { return new Runnable() { @Override public void run() { //Construct a new Rectangle and let the Delegate set its values Rect touchRect = new Rect(); delegate.getHitRect(touchRect); //Modify the dimensions of the Rectangle //Padding values below zero are replaced by zeros touchRect.top-=Math.max(0, topPadding); touchRect.bottom+=Math.max(0, bottomPadding); touchRect.left-=Math.max(0, leftPadding); touchRect.right+=Math.max(0, rightPadding); //Now we are going to construct the TouchDelegate TouchDelegate touchDelegate = new TouchDelegate(touchRect, delegate); //And set it on the parent parent.setTouchDelegate(touchDelegate); }

使用方法:

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//Get references to the View in the layout parent = (View) findViewById(R.id.parent); delegateButton = (View) findViewById(R.id.cmdClickMe); //The TouchDelegate has to be set after everything has been calculated and drawn parent.post(getTouchDelegateAction(parent, delegateButton, 50,50,50,50));

將 getTouchDelegateAction 放入自己常用 library, 以後按需要直接使用, 紅黑紅紅黑, 就係咁簡單.