我刚刚将Android项目迁移到gradle。迁移前一切正常。我有相同的布局文件。我的回购在这里：
https://github.com/jackygrahamez/MayDay/tree/gradle2
我遇到某些活动设置有问题。在我的消息设置活动设置中，我设置了片段：
Fragment fragment = getFragmentManager().findFragmentById(R.id.sms_message);
这会返回一个null我正在捕捉if语句，但这意味着我的活动没有正确配置。
package com.mayday.md.fragment;
import com.mayday.md.MainActivity;
import com.mayday.md.R;
import com.mayday.md.WizardActivity;
import com.mayday.md.adapter.PageItemAdapter;
import com.mayday.md.common.AppConstants;
import com.mayday.md.common.AppUtil;
import com.mayday.md.common.ApplicationSettings;
import com.mayday.md.common.MyTagHandler;
import com.mayday.md.data.PBDatabase;
import com.mayday.md.model.Page;
import com.mayday.md.model.PageItem;
import com.mayday.md.model.SMSSettings;
import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.text.Html;
import android.util.DisplayMetrics;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AdapterView;
import android.widget.Button;
import android.widget.EditText;
import android.widget.LinearLayout;
import android.widget.ListView;
import android.widget.TextView;
import android.widget.Toast;
/**
* Created by aoe on 12/12/13.
*/
public class SetupMessageFragment extends Fragment {
private EditText smsEditText;
private static final String PAGE_ID = "page_id";
private static final String PARENT_ACTIVITY = "parent_activity";
private Activity activity;
DisplayMetrics metrics;
TextView tvTitle, tvContent, tvIntro, tvWarning;
Button bAction;
ListView lvItems;
LinearLayout llWarning;
Page currentPage;
PageItemAdapter pageItemAdapter;
public static SetupMessageFragment newInstance(String pageId, int parentActivity) {
SetupMessageFragment f = new SetupMessageFragment();
Bundle args = new Bundle();
args.putString(PAGE_ID, pageId);
args.putInt(PARENT_ACTIVITY, parentActivity);
f.setArguments(args);
return(f);
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.fragment_type_interactive_message, container, false);
tvTitle = (TextView) view.findViewById(R.id.fragment_title);
tvIntro = (TextView) view.findViewById(R.id.fragment_intro);
tvContent = (TextView) view.findViewById(R.id.fragment_contents);
bAction = (Button) view.findViewById(R.id.fragment_action);
bAction.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Log.e(">>>>", "action button pressed");
String msg = getSMSSettingsFromView();
SMSSettings.saveMessage(activity, msg);
displaySettings(msg);
if (currentPage != null) {
Log.e(">>>>", "onCreateView (currentPage != null)");
String pageId = currentPage.getAction().get(0).getLink();
int parentActivity = getArguments().getInt(PARENT_ACTIVITY);
Intent i;
if(parentActivity == AppConstants.FROM_WIZARD_ACTIVITY){
i = new Intent(activity, WizardActivity.class);
} else{
// AppUtil.showToast("Message saved.", 1000, activity);
String confirmation = (currentPage.getAction().get(0).getConfirmation() == null)
? AppConstants.DEFAULT_CONFIRMATION_MESSAGE
: currentPage.getAction().get(0).getConfirmation();
Toast.makeText(activity, confirmation, Toast.LENGTH_SHORT).show();
i = new Intent(activity, MainActivity.class);
}
i.putExtra("page_id", pageId);
startActivity(i);
if(parentActivity == AppConstants.FROM_MAIN_ACTIVITY){
activity.finish();
}
}
}
});
lvItems = (ListView) view.findViewById(R.id.fragment_item_list);
llWarning = (LinearLayout) view.findViewById(R.id.ll_fragment_warning);
tvWarning = (TextView) view.findViewById(R.id.fragment_warning);
lvItems.setOnItemClickListener(new AdapterView.OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
PageItem selectedItem = (PageItem) parent.getItemAtPosition(position);
String pageId = selectedItem.getLink();
int parentActivity = getArguments().getInt(PARENT_ACTIVITY);
Intent i;
if(parentActivity == AppConstants.FROM_WIZARD_ACTIVITY){
i = new Intent(activity, WizardActivity.class);
} else{
i = new Intent(activity, MainActivity.class);
}
i.putExtra("page_id", pageId);
startActivity(i);
}
});
return view;
}
@Override
public void onActivityCreated(Bundle savedInstanceState) {
super.onActivityCreated(savedInstanceState);
activity = getActivity();
if (activity != null) {
metrics = new DisplayMetrics();
activity.getWindowManager().getDefaultDisplay().getMetrics(metrics);
Log.e(">>>>", "onActivityCreated setting fragment");
Fragment fragment = getFragmentManager().findFragmentById(R.id.sms_message);
if (fragment != null) {
Log.e(">>>>", "onActivityCreated (fragment != null)");
((MessageTextFragment)fragment).setActionButtonStateListener(bAction);
smsEditText = (EditText) fragment.getView().findViewById(R.id.message_edit_text);
String currentMsg = SMSSettings.retrieveMessage(activity);
if(currentMsg != null) {
displaySettings(currentMsg);
}
bAction.setEnabled(!smsEditText.getText().toString().trim().equals(""));
String pageId = getArguments().getString(PAGE_ID);
String selectedLang = ApplicationSettings.getSelectedLanguage(activity);
PBDatabase dbInstance = new PBDatabase(activity);
dbInstance.open();
currentPage = dbInstance.retrievePage(pageId, selectedLang);
dbInstance.close();
tvTitle.setText(currentPage.getTitle());
if(currentPage.getContent() == null)
tvContent.setVisibility(View.GONE);
else
tvContent.setText(Html.fromHtml(currentPage.getContent(), null, new MyTagHandler()));
if(currentPage.getIntroduction() == null)
tvIntro.setVisibility(View.GONE);
else
tvIntro.setText(currentPage.getIntroduction());
if(currentPage.getWarning() == null)
llWarning.setVisibility(View.GONE);
else
tvWarning.setText(currentPage.getWarning());
bAction.setText(currentPage.getAction().get(0).getTitle());
pageItemAdapter = new PageItemAdapter(activity, null);
lvItems.setAdapter(pageItemAdapter);
pageItemAdapter.setData(currentPage.getItems());
AppUtil.updateImages(true, currentPage.getContent(), activity, metrics, tvContent, AppConstants.IMAGE_INLINE);
}
else {
Log.e(">>>>", "onActivityCreated (fragment == null)");
}
}
}
private void displaySettings(String msg) {
if (smsEditText != null) {
Log.e(">>>>", " smsEditText is not null");
smsEditText.setText(msg);
} else {
Log.e(">>>>", "displaySettings smsEditText null");
}
}
private String getSMSSettingsFromView() {
if (smsEditText != null) {
String message = smsEditText.getText().toString().trim();
if (message != null) {
Log.e(">>>>", "getSMSSettingsFromView set message " + message);
return message;
} else {
Log.e(">>>>", "getSMSSettingsFromView message null");
return "";
}
} else {
Log.e(">>>>", "getSMSSettingsFromView smsEditText null");
return "";
}
}
}
这是logcat
02-13 09:39:47.290 16841-16841/com.mayday.md E/SimpleFragment.onPause﹕ settings
02-13 09:39:47.290 16841-16841/com.mayday.md E/MainActivity.onPause﹕ .
02-13 09:39:47.290 16841-16841/com.mayday.md E/MainActivity.onPause﹕ flagRiseFromPause = true
02-13 09:39:47.310 16841-16841/com.mayday.md D/AbsListView﹕ unregisterIRListener() is called
02-13 09:39:47.310 16841-16841/com.mayday.md D/AbsListView﹕ unregisterIRListener() is called
02-13 09:39:47.320 16841-16841/com.mayday.md E/>>>>>﹕ Registering finish activity in oncreate -> BaseFragmentActivity
02-13 09:39:47.330 16841-16841/com.mayday.md E/MainActivity.onCreate﹕ pageId = settings-message
02-13 09:39:47.400 16841-16841/com.mayday.md D/AbsListView﹕ Get MotionRecognitionManager
02-13 09:39:47.400 16841-16841/com.mayday.md E/>>>>﹕ onActivityCreated setting fragment
02-13 09:39:47.400 16841-16841/com.mayday.md E/>>>>﹕ onActivityCreated (fragment == null)
02-13 09:39:47.400 16841-16841/com.mayday.md E/MainActivity.onStart﹕ .
02-13 09:39:47.400 16841-16841/com.mayday.md E/MainActivity.onResume﹕ pageId = settings-message and flagRiseFromPause = false
02-13 09:39:47.400 16841-16841/com.mayday.md D/AbsListView﹕ onVisibilityChanged() is called, visibility : 4
02-13 09:39:47.400 16841-16841/com.mayday.md D/AbsListView﹕ unregisterIRListener() is called
02-13 09:39:47.410 16841-16841/com.mayday.md D/AbsListView﹕ onVisibilityChanged() is called, visibility : 0
02-13 09:39:47.410 16841-16841/com.mayday.md D/AbsListView﹕ unregisterIRListener() is called
02-13 09:39:47.430 16841-16841/com.mayday.md D/AbsListView﹕ unregisterIRListener() is called
02-13 09:39:47.500 16841-16841/com.mayday.md D/AbsListView﹕ unregisterIRListener() is called
02-13 09:39:47.530 16841-16841/com.mayday.md D/AbsListView﹕ unregisterIRListener() is called
02-13 09:39:47.560 16841-16841/com.mayday.md D/AbsListView﹕ unregisterIRListener() is called
02-13 09:39:47.750 16841-16841/com.mayday.md D/AbsListView﹕ unregisterIRListener() is called
02-13 09:39:47.880 16841-16841/com.mayday.md E/SimpleFragment.onStop﹕ settings
02-13 09:39:47.880 16841-16841/com.mayday.md E/MainActivity.onStop﹕ .
02-13 09:39:47.890 16841-16841/com.mayday.md D/AbsListView﹕ onVisibilityChanged() is called, visibility : 4
02-13 09:39:47.890 16841-16841/com.mayday.md D/AbsListView﹕ unregisterIRListener() is called
02-13 09:39:47.890 16841-16841/com.mayday.md D/AbsListView﹕ onVisibilityChanged() is called, visibility : 4
02-13 09:39:47.890 16841-16841/com.mayday.md D/AbsListView﹕ unregisterIRListener() is called
02-13 09:39:51.220 16841-16841/com.mayday.md D/AbsListView﹕ unregisterIRListener() is called
02-13 09:39:53.260 16841-16841/com.mayday.md E/>>>>﹕ action button pressed
02-13 09:39:53.260 16841-16841/com.mayday.md E/>>>>﹕ getSMSSettingsFromView smsEditText null
02-13 09:39:53.260 16841-16841/com.mayday.md E/>>>>﹕ displaySettings smsEditText null
答案 0 :(得分：2)
由于您使用的是支持库
import android.support.v4.app.Fragment;
你需要像这样FragmentManager：
Fragment fragment = getSupportFragmentManager().findFragmentById(R.id.sms_message);
答案 1 :(得分：0)
感谢@Marcus提供的所有建议，他们提供了帮助，但当我从Maven中心退出依赖关系到以下的本地依赖版本时，我似乎已经消失了这个问题：
GSON-2.2.4.jar
支持-V4-r12.jar
似乎这些版本是必需的，或者 THIS 项目中的所有内容都已中断。