我正在开发一个不会向我显示任何错误且运行得很好的应用程序，但是经过一秒钟后崩溃，我尝试了所有但是找不到错误（是新的）有人可以告诉我我在哪里做错了
logcat的
11-08 12:57:16.011 5886-5886/com.koshur.socialnetwork E/AndroidRuntime﹕ FATAL EXCEPTION: main
Process: com.koshur.socialnetwork, PID: 5886
java.lang.NullPointerException: Attempt to invoke virtual method 'void com.koshur.socialnetwork.adapters.HomeListAdapter.setPosts(java.util.List)' on a null object reference
at com.koshur.socialnetwork.activities.ProfilePreview.updateView(ProfilePreview.java:334)
at com.koshur.socialnetwork.activities.ProfilePreview.access$300(ProfilePreview.java:42)
at com.koshur.socialnetwork.activities.ProfilePreview$5.success(ProfilePreview.java:308)
at com.koshur.socialnetwork.activities.ProfilePreview$5.success(ProfilePreview.java:300)
at retrofit.CallbackRunnable$1.run(CallbackRunnable.java:45)
at android.os.Handler.handleCallback(Handler.java:739)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:135)
at android.app.ActivityThread.main(ActivityThread.java:5293)
at java.lang.reflect.Method.invoke(Native Method)
at java.lang.reflect.Method.invoke(Method.java:372)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:904)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:699)
java class
public class ProfilePreview extends AppCompatActivity implements View.OnClickListener, SwipeRefreshLayout.OnRefreshListener {
public TextView userProfileName,
userTotalFollowers,
userTotalPosts,
userProfileAddress,
userProfileJob,
followProfileBtn,
contactProfileBtn,
userPostsBtn;
public userItem user;
public RecyclerView postsList;
public LinearLayoutManager layoutManager;
int currentPage = 1;
private HomeListAdapter mHomeListAdapter;
private SwipeRefreshLayout mSwipeRefreshLayout;
public ImageView userProfilePicture, userProfileCover;
public LinearLayout actionProfileArea;
public int userID = 0;
private CacheManager mCacheManager;
private ThinDownloadManager downloadManager;
private Gson mGson;
LoadingView loginLoadingView;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
if (M.getToken(this) == null) {
Intent mIntent = new Intent(this, LoginActivity.class);
startActivity(mIntent);
finish();
} else {
setContentView(R.layout.activity_profile_preview);
initializeView();
loginLoadingView = (LoadingView)findViewById(R.id.loginLoadingView);
if (getIntent().hasExtra("userID")) {
userID = getIntent().getExtras().getInt("userID");
}
mCacheManager = CacheManager.getInstance(getApplicationContext());
mGson = new Gson();
getUser();
getPosts();
}
}
private void initializeView() {
downloadManager = new ThinDownloadManager(AppConst.DOWNLOAD_THREAD_POOL_SIZE);
userProfileName = (TextView) findViewById(R.id.userProfileName);
userProfilePicture = (ImageView) findViewById(R.id.userProfilePicture);
userTotalFollowers = (TextView) findViewById(R.id.userTotalFollowers);
userTotalPosts = (TextView) findViewById(R.id.userTotalPosts);
followProfileBtn = (TextView) findViewById(R.id.followProfileBtn);
contactProfileBtn = (TextView) findViewById(R.id.contactProfileBtn);
actionProfileArea = (LinearLayout) findViewById(R.id.actionProfileArea);
userProfileAddress = (TextView) findViewById(R.id.userProfileAddress);
userProfileJob = (TextView) findViewById(R.id.userProfileJob);
userProfileCover = (ImageView) findViewById(R.id.userProfileCover);
userPostsBtn = (TextView) findViewById(R.id.userPostsBtn);
userPostsBtn.setOnClickListener(this);
followProfileBtn.setOnClickListener(this);
contactProfileBtn.setOnClickListener(this);
postsList = (RecyclerView) findViewById(R.id.postsList);
mSwipeRefreshLayout = (SwipeRefreshLayout) findViewById(R.id.swipeHome);
mSwipeRefreshLayout.setOnRefreshListener(this);
postsList.setOnScrollListener(new HidingScrollListener(layoutManager) {
@Override
public void onHide() {
}
@Override
public void onShow() {
}
@Override
public void onLoadMore(int currentPage) {
setCurrentPage(currentPage);
getPosts();
}
});
}
private void getUser() {
if (M.isNetworkAvailable(getApplicationContext())) {
loginLoadingView.setLoading(true);
UsersAPI mUsersAPI = APIService.createService(UsersAPI.class, M.getToken(this));
mUsersAPI.getUser(userID, new Callback<userItem>() {
@Override
public void success(userItem user, retrofit.client.Response response) {
try {
mCacheManager.write(mGson.toJson(user), "Profile-" + userID + ".json");
} catch (Exception e) {
e.printStackTrace();
}
updateView(user);
}
@Override
public void failure(RetrofitError error) {
loginLoadingView.setLoading(false);
M.T(ProfilePreview.this, getString(R.string.ServerError));
}
});
} else {
try {
String profile = mCacheManager.readString("Profile-" + userID + ".json");
Gson mGson = new Gson();
updateView((userItem) mGson.fromJson(profile, new TypeToken<userItem>() {
}.getType()));
} catch (Exception e) {
M.L(e.getMessage());
}
}
}
private void downloadFile(String url, String hash) {
if (getFilePath(hash) == null) {
Uri downloadUri = Uri.parse(url);
Uri destinationUri = Uri.parse(M.getFilePath(getApplicationContext(), hash));
DownloadRequest downloadRequest = new DownloadRequest(downloadUri)
.setDestinationURI(destinationUri);
downloadManager.add(downloadRequest);
}
}
private void updateView(userItem user) {
this.user = user;
if (user.isMine()) {
actionProfileArea.setVisibility(View.GONE);
} else {
actionProfileArea.setVisibility(View.VISIBLE);
}
if (user.isFollowed()) {
followProfileBtn.setText(getString(R.string.UnFollow));
contactProfileBtn.setVisibility(View.VISIBLE);
} else {
followProfileBtn.setText(getString(R.string.Follow));
contactProfileBtn.setVisibility(View.GONE);
}
if (user.getName() != null) {
userProfileName.setText(user.getName());
} else {
userProfileName.setText(user.getUsername());
}
if (user.getAddress() != null) {
userProfileAddress.setVisibility(View.VISIBLE);
userProfileAddress.setText(user.getAddress());
} else {
userProfileAddress.setVisibility(View.GONE);
}
if (user.getJob() != null) {
userProfileJob.setVisibility(View.VISIBLE);
userProfileJob.setText(user.getJob());
} else {
userProfileJob.setVisibility(View.GONE);
}
if (getFilePath(user.getPicture()) != null) {
Picasso.with(this)
.load(new File(getFilePath(user.getPicture())))
.transform(new CropSquareTransformation())
.placeholder(R.drawable.image_holder)
.error(R.drawable.image_holder)
.into(userProfilePicture);
} else {
Picasso.with(this)
.load(AppConst.IMAGE_PROFILE_URL + user.getPicture())
.transform(new CropSquareTransformation())
.placeholder(R.drawable.image_holder)
.error(R.drawable.image_holder)
.into(userProfilePicture);
downloadFile(AppConst.IMAGE_PROFILE_URL + user.getPicture(), user.getPicture());
}
if (user.getCover() != null) {
if (getFilePath(user.getCover()) != null) {
userProfileCover.setImageURI(Uri.parse(getFilePath(user.getCover())));
} else {
Picasso.with(this)
.load(AppConst.IMAGE_COVER_URL + user.getCover())
.placeholder(R.drawable.header)
.error(R.drawable.header)
.into(userProfileCover);
downloadFile(AppConst.IMAGE_COVER_URL + user.getCover(), user.getCover());
}
} else {
Picasso.with(this)
.load(R.drawable.header)
.into(userProfileCover);
}
userTotalFollowers.setText(user.getTotalFollowers() + "");
userTotalPosts.setText(user.getTotalPosts() + "");
loginLoadingView.setLoading(false);
}
private String getFilePath(String hash) {
return M.filePath(getApplicationContext(), hash);
}
@Override
public void onClick(View v) {
switch (v.getId()) {
case R.id.followProfileBtn:
UsersAPI mUsersAPI = APIService.createService(UsersAPI.class, M.getToken(this));
mUsersAPI.followToggle(userID, new Callback<ResponseModel>() {
@Override
public void success(ResponseModel responseModel, Response response) {
if (responseModel.isDone()) {
if (user.isFollowed()) {
user.setFollowed(false);
followProfileBtn.setText(getString(R.string.Follow));
loginLoadingView.setLoading(true);
contactProfileBtn.setVisibility(View.GONE);
loginLoadingView.setLoading(false);
} else {
user.setFollowed(true);
followProfileBtn.setText(getString(R.string.UnFollow));
contactProfileBtn.setVisibility(View.VISIBLE);
}
} else {
M.T(ProfilePreview.this, responseModel.getMessage());
}
}
@Override
public void failure(RetrofitError error) {
M.T(ProfilePreview.this, getString(R.string.ServerError));
}
});
break;
case R.id.contactProfileBtn:
Intent messagingIntent = new Intent(this, MessagingActivity.class);
messagingIntent.putExtra("conversationID", 0);
messagingIntent.putExtra("recipientID", userID);
startActivity(messagingIntent);
break;
case R.id.userPostsBtn:
Intent userPostsIntent = new Intent(this, UserPosts.class);
userPostsIntent.putExtra("userID", userID);
startActivity(userPostsIntent);
finish();
break;
}
}
public void getPosts() {
if (M.isNetworkAvailable(this)) {
if (!mSwipeRefreshLayout.isRefreshing()) {
mSwipeRefreshLayout.setRefreshing(true);
}
PostsAPI mPostsAPI = APIService.createService(PostsAPI.class, M.getToken(this));
mPostsAPI.getUserPosts(userID, getCurrentPage(), new Callback<List<PostsItem>>() {
@Override
public void success(List<PostsItem> postsItems, retrofit.client.Response response) {
try {
mCacheManager.write(mGson.toJson(postsItems), "UserPosts-" + userID + ".json");
} catch (Exception e) {
e.printStackTrace();
}
updateView(postsItems);
}
@Override
public void failure(RetrofitError error) {
loginLoadingView.setLoading(false);
}
});
} else {
try {
String UserPostsString = mCacheManager.readString("UserPosts-" + userID + ".json");
updateView((List<PostsItem>) mGson.fromJson(UserPostsString, new TypeToken<List<PostsItem>>() {
}.getType()));
} catch (Exception e) {
e.printStackTrace();
}
}
}
private void updateView(List<PostsItem> postsItems) {
if (getCurrentPage() != 1) {
List<PostsItem> oldItems = mHomeListAdapter.getPosts();
oldItems.addAll(postsItems);
mHomeListAdapter.setPosts(oldItems);
} else {
mHomeListAdapter.setPosts(postsItems);
}
if (mSwipeRefreshLayout.isRefreshing()) {
mSwipeRefreshLayout.setRefreshing(false);
}
}
@Override
public void onRefresh() {
setCurrentPage(1);
getPosts();
}
public int getCurrentPage() {
return currentPage;
}
public void setCurrentPage(int currentPage) {
this.currentPage = currentPage;
}
}
答案 0 :(得分：0)
至少从您发布的代码中，您没有初始化您的mhomelistadapter，因此当您调用setPosts时它为null