android中dialog的dismiss()和cancel()的区别

最新推荐文章于 2024-04-14 01:40:16 发布

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本文详细解析了Android中Dialog的dismiss()与cancel()方法的区别。虽然两种方式都能使Dialog从屏幕上消失，但cancel()方法还提供了OnCancelListener的回调机制。

dismiss() 主要作用是让dialog从屏幕上消失源码如下：

    /**
     * Dismiss this dialog, removing it from the screen. This method can be
     * invoked safely from any thread.  Note that you should not override this
     * method to do cleanup when the dialog is dismissed, instead implement
     * that in {@link #onStop}.
     */
    @Override
    public void dismiss() {
        if (Looper.myLooper() == mHandler.getLooper()) {
            dismissDialog();
        } else {
            mHandler.post(mDismissAction);
        }
    }

cancel() 源码如下：

    /**
     * Cancel the dialog.  This is essentially the same as calling {@link #dismiss()}, but it will
     * also call your {@link DialogInterface.OnCancelListener} (if registered).
     */
    public void cancel() {
        if (!mCanceled && mCancelMessage != null) {
            mCanceled = true;
            // Obtain a new message so this dialog can be re-used
            Message.obtain(mCancelMessage).sendToTarget();
        }
        dismiss();
    }

从源码可以看出2个方法的效果一样都是让dialog消失，只是cancel() 多了一个DialogInterface.OnCancelListener的回调。