[英]Fragment's onCreate and onCreateView are not called
我正在构建一个接收 action.SEND Intent
的应用程序,并将剪辑数据中的所有文件显示到ListView
。 我的ListView
位于由我的MainActiviy
托管的ShareFragment
内。 下面是我如何实现它。
public class ShareFragment extends MFragment {
private static final String TAG = "ShareFragment";
private List<File> files;
private FileAdapter fileAdapter;
@Override
public void onCreate(@Nullable Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
Log.e(TAG, "onCreate called");
}
@Nullable
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
files = new ArrayList<>();
fileAdapter = new FileAdapter(getActivity(), 0, files);
View rootView = inflater.inflate(R.layout.share_fragment, container, false);
ListView lv = (ListView) rootView.findViewById(R.id.listView);
lv.setAdapter(fileAdapter);
Log.e(TAG, "onCreateView called");
return rootView;
}
public void setData(List<File> files){
Log.e(TAG, "setData called");
this.files = files;
fileAdapter.notifyDataSetChanged();
}
这是我在MainActivity
使用它的方式
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Intent intent = getIntent();
shareFragment = (ShareFragment) getSupportFragmentManager().findFragmentByTag("share_fragment");
if(shareFragment == null) {
shareFragment = new ShareFragment();
shareFragment.setTitle("Share");
}
FragmentTransaction ft = getSupportFragmentManager().beginTransaction();
ft.add(R.id.fl_root, shareFragment, "share_fragment");
ft.commit();
handleIntent(intent);
}
这是handleIntent
方法:
private void handleIntent(Intent intent) {
String action = intent.getAction();
String type = intent.getType();
if ((Intent.ACTION_SEND.equals(action) || Intent.ACTION_SEND_MULTIPLE.equals(action)) && type != null) {
int size = intent.getClipData().getItemCount();
List<File> files = new ArrayList<>();
for (int i = 0; i < size; i++) {
File file = new File(intent.getClipData().getItemAt(i).getUri().getPath());
files.add(file);
}
shareFragment.setData(files);
}
}
我的问题是当我的应用程序通过接收action.SEND
Intent
启动时,它遇到了onCreate
并处理了这一行shareFragment = new ShareFragment()
但是永远不会调用ShareFragment
onCreate
和onCreateView
。 为什么?
注意我认为FragmentManager
在我的应用程序第一次运行时保留了一个ShareFragment
实例。 所以我试图找到我的片段来重用它,但它总是返回 null。
编辑我在fileAdapter.notifyDataSetChanged();
处得到一个NullPointerException
fileAdapter.notifyDataSetChanged();
Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'void icetea.com.quickshare.adapter.FileAdapter.notifyDataSetChanged()' on a null object reference
at icetea.com.quickshare.fragments.ShareFragment.setData(ShareFragment.java:49)
at icetea.com.quickshare.MainActivity.handleIntent(MainActivity.java:63)
at icetea.com.quickshare.MainActivity.onCreate(MainActivity.java:46)
at android.app.Activity.performCreate(Activity.java:6374)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1119)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2767)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2879)
at android.app.ActivityThread.access$900(ActivityThread.java:182)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1475)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:145)
at android.app.ActivityThread.main(ActivityThread.java:6141)
at java.lang.reflect.Method.invoke(Native Method)
at java.lang.reflect.Method.invoke(Method.java:372)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1399)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1194)
移动handleIntent(intent);
进入onResume()
您尝试在 onCreate 中设置数据,但此时未创建片段
您可以在 Fragments 文档中找到更多相关信息: http : //developer.android.com/guide/components/fragments.html#Lifecycle
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