android中dialog的dismiss()和cancel()的区别

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。