【Android】onActivityResult()和onResume()的调用顺序问题

在Android生命周期中，如果使用到startActivityForResult()，则在新Activity被finish掉之后，onActivityResult()和onResume()到底是哪一个先调用的呢？

我们来看官方源码：

/**
* Called when an activity you launched exits, giving you the requestCode
* you started it with, the resultCode it returned, and any additional
* data from it.  The <var>resultCode</var> will be
* {@link #RESULT_CANCELED} if the activity explicitly returned that,
* didn't return any result, or crashed during its operation.
*
* <p>You will receive this call immediately before onResume() when your
* activity is re-starting.
*
* <p>This method is never invoked if your activity sets
* {@link android.R.styleable#AndroidManifestActivity_noHistory noHistory} to
* <code>true</code>.
*
* @param requestCode The integer request code originally supplied to
*                    startActivityForResult(), allowing you to identify who this
*                    result came from.
* @param resultCode The integer result code returned by the child activity
*                   through its setResult().
* @param data An Intent, which can return result data to the caller
*               (various data can be attached to Intent "extras").
*
* @see #startActivityForResult
* @see #createPendingResult
* @see #setResult(int)
*/
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
}

从上面的源码注释第二段可以看到：You will receive this call immediately before onResume() when your activity is re-starting. 所以很明显，在activity重新恢复启动的时候，onActivityResult()会在onResume()之前调用完毕。

而且，onActivityResult()还会在onStart()之前调用完毕。经过断点调试，发现它们三者的调用顺序如下：

onActivityResult() -> onStart() -> onResume()