Android的Fragment中onActivityResult不被调用的解决方案(绝对管用)

一个大牛的博文： http://blog.csdn.net/shuaihj/article/details/46663109
常见的，我们会在FragmentActivity中嵌套一层Fragment使用，甚至Fragment下层层嵌套使用。这个时候，在第二级或者更深级别的Fragment将无法收到onActivityResult回调，查看FragementActivity的源码发现：

public void startActivityFromFragment(Fragment fragment, Intent intent,
: int requestCode) {
: if (requestCode == -1) {
: super.startActivityForResult(intent, -1);
: return;
: }
: if ((requestCode&0xffff0000) != 0) {
: throw new IllegalArgumentException("Can only use lower 16 bits for requestCode");
: }
: super.startActivityForResult(intent, ((fragment.mIndex+1)<<16) + (requestCode&0xffff));
: }
: @Override
: protected void onActivityResult(int requestCode, int resultCode, Intent data) {
: mFragments.noteStateNotSaved();
: int index = requestCode>>16;
: if (index != 0) {
: index--;
: if (mFragments.mActive == null || index < 0 || index >= mFragments.mActive.size()) {
: Log.w(TAG, "Activity result fragment index out of range: 0x"
: + Integer.toHexString(requestCode));
: return;
: }
: Fragment frag = mFragments.mActive.get(index);
: if (frag == null) {
: Log.w(TAG, "Activity result no fragment exists for index: 0x"
: + Integer.toHexString(requestCode));
: } else {
: frag.onActivityResult(requestCode&0xffff, resultCode, data);
: }
: return;
: }
:
: super.onActivityResult(requestCode, resultCode, data);
: }
: 原来，程序猿偷懒，没有处理嵌套Fragment的情况，也就是说回调只到第一级Fragment，就没有继续分发。我们可以实现一个自己的FragmentActiviy，来实现继续分发，如下：
public class BaseFragmentActiviy extends FragmentActivity {
private static final String TAG = "BaseActivity";

@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
FragmentManager fm = getSupportFragmentManager();
int index = requestCode >> 16;
if (index != 0) {
index--;
if (fm.getFragments() == null || index < 0
|| index >= fm.getFragments().size()) {
Log.w(TAG, "Activity result fragment index out of range: 0x"
+ Integer.toHexString(requestCode));
return;
}
Fragment frag = fm.getFragments().get(index);
if (frag == null) {
Log.w(TAG, "Activity result no fragment exists for index: 0x"
+ Integer.toHexString(requestCode));
} else {
handleResult(frag, requestCode, resultCode, data);
}
return;
}

}

/**
* 递归调用，对所有子Fragement生效
*
* @param frag
* @param requestCode
* @param resultCode
* @param data
*/
private void handleResult(Fragment frag, int requestCode, int resultCode,
Intent data) {
frag.onActivityResult(requestCode & 0xffff, resultCode, data);
List<Fragment> frags = frag.getChildFragmentManager().getFragments();
if (frags != null) {
for (Fragment f : frags) {
if (f != null)
handleResult(f, requestCode, resultCode, data);
}
}
}

然后我们继承这个BaseFragmentActivity即可，但是要注意，在Fragment中启动Activity时，一定要调用根Fragment的启动方法，如下：
/**
* 得到根Fragment
*
* @return
*/
private Fragment getRootFragment() {
Fragment fragment = getParentFragment();
while (fragment.getParentFragment() != null) {
fragment = fragment.getParentFragment();
}
return fragment;

}

/**
* 启动Activity
*/
private void onClickTextViewRemindAdvancetime() {
Intent intent = new Intent();
intent.setClass(getActivity(), YourActivity.class);
intent.putExtra("TAG","TEST");
getRootFragment().startActivityForResult(intent, 1001);
}
ps：support v4 23.0.0以后的版本应该不用这么复杂了，因为已经改了代码了