android源码解析--Dialog

在学习设计模式建造者模式时，发现AlertDialog和它的内部类Builder就是比较典型的建造者模式，所以先分析下基类Dialog，然后再看子类AlertDialog和它的内部类Builder。

按照惯例，先看下类说明：

    /**     * @see Activity#onPreparePanel(int, View, Menu)     */    public boolean onPreparePanel(int featureId, View view, Menu menu) {        if (featureId == Window.FEATURE_OPTIONS_PANEL && menu != null) {            boolean goforit = onPrepareOptionsMenu(menu);            return goforit && menu.hasVisibleItems();        }        return true;    }

实现Window.Callback接口的onPreparePanel方法。每次当panel窗口显示前，都会调用该函数，返回true显示，false则不显示。

    /**     * It is usually safe to proxy this call to the owner activity's     * {@link Activity#onCreateOptionsMenu(Menu)} if the client desires the same     * menu for this Dialog.     *      * @see Activity#onCreateOptionsMenu(Menu)     * @see #getOwnerActivity()     */    public boolean onCreateOptionsMenu(Menu menu) {        return true;    }
调用创建该Dialog的Activity的onCreateOptionMenu方法。
/**     * {@inheritDoc}     *     * Note that if you override this method you should always call through     * to the superclass implementation by calling super.onActionModeStarted(mode).     */    public void onActionModeStarted(ActionMode mode) {        mActionMode = mode;    }    /**     * {@inheritDoc}     *     * Note that if you override this method you should always call through     * to the superclass implementation by calling super.onActionModeFinished(mode).     */    public void onActionModeFinished(ActionMode mode) {        if (mode == mActionMode) {            mActionMode = null;        }    }

注意,如果你重写这个方法，你一定要调用父类的super.onActionModeFinished(mode)。开始时候设置mode，结束时把mode设为空。
private static final class ListenersHandler extends Handler {        private WeakReference<DialogInterface> mDialog;        public ListenersHandler(Dialog dialog) {            mDialog = new WeakReference<DialogInterface>(dialog);        }        @Override        public void handleMessage(Message msg) {            switch (msg.what) {                case DISMISS:                    ((OnDismissListener) msg.obj).onDismiss(mDialog.get());                    break;                case CANCEL:                    ((OnCancelListener) msg.obj).onCancel(mDialog.get());                    break;                case SHOW:                    ((OnShowListener) msg.obj).onShow(mDialog.get());                    break;            }        }    }

ListenersHandler的定义。
将近3点了，有点困，想睡了。。。


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1楼chuange501昨天 13:00
不错，学习了
Re: aomandeshangxiao昨天 13:40
回复chuange501n呵呵，谢谢。。。