我刚接触Android开发。我在项目中使用Firebase，在分析应用程序中，内存堆正在逐渐增加。而且我无法找到原因。我用了leakcanary库并得到了这个 screenshot from leakcanary
我有一个叫做HomeScreen的活动，其中有3个片段附加到布局上。任何人都可以帮忙吗？
public class HomeScreen extends AppCompatActivity {
private Toolbar toolbar;
private TabLayout tabLayout;
private ViewPager viewPager;
private FloatingActionButton fab;
CircleImageView imgView;
AppTextView atv;
MenuAdapter menuAdapter;
SharedPreferences prefs;
Button b;
String UID;
File file;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_home_screen);
toolbar = findViewById(R.id.home_screen_toolbar);
tabLayout = findViewById(R.id.home_screen_tabs);
viewPager = findViewById(R.id.viewpager);
fab = findViewById(R.id.fab_home_screen);
setSupportActionBar(toolbar);
setupViewPager(viewPager);
tabLayout.setupWithViewPager(viewPager);
tabLayout.getTabAt(2).setIcon(R.drawable.peoples);
tabLayout.getTabAt(1).setIcon(R.drawable.automated_messages);
tabLayout.getTabAt(0).setIcon(R.drawable.ic_warning);
prefs = getSharedPreferences(getString(R.string.USER_DATA), MODE_PRIVATE);
UID = prefs.getString("uid", "error");
file = new File(getFilesDir(), "profile");
toolbar.setTitle("Chats");
tabLayout.addOnTabSelectedListener(new TabLayout.OnTabSelectedListener() {
@Override
public void onTabSelected(TabLayout.Tab tab) {
if(tab.getPosition() == 0){
fab.setImageResource(R.drawable.automated_messages);
toolbar.setTitle("Story");
}
else if(tab.getPosition() == 1){
fab.setImageResource(R.drawable.create);
toolbar.setTitle("Chats");
}
else if(tab.getPosition() == 2){
fab.setImageResource(R.drawable.search);
toolbar.setTitle("Friends");
}
else
fab.setImageResource(android.R.color.transparent);
}
@Override
public void onTabUnselected(TabLayout.Tab tab) {
}
@Override
public void onTabReselected(TabLayout.Tab tab) {
}
});
fab.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
if(viewPager.getCurrentItem() == 0)
Snackbar.make(view,"new chat",Snackbar.LENGTH_LONG).show();
else if(viewPager.getCurrentItem() == 1)
createStory(view);
else if(viewPager.getCurrentItem() == 2)
Snackbar.make(view,"Search friends",Snackbar.LENGTH_LONG).show();
else
Snackbar.make(view,"Do nothing",Snackbar.LENGTH_SHORT).show();
}
});
DuoMenuView duoMenuView = findViewById(R.id.menu);
ArrayList<String> list = new ArrayList<>();
list.add("Home");
list.add("Profile");
list.add("Friends");
list.add("Settings");
list.add("info");
menuAdapter = new MenuAdapter(list);
duoMenuView.setAdapter(menuAdapter);
imgView = duoMenuView.getHeaderView().findViewById(R.id.dp_ico);
b = duoMenuView.getFooterView().findViewById(R.id.logout);
atv = duoMenuView.getHeaderView().findViewById(R.id.name_h);
atv.setText(prefs.getString("name","Me"));
if(!file.exists())
{
int i = R.drawable.profile;
switch (prefs.getInt("icon",0)) {
case 0:
i = R.drawable.boy_i;
break;
case 1:
i = R.drawable.girl_i;
break;
case 2:
i = R.drawable.boy_ii;
break;
case 3:
i = R.drawable.girl_ii;
break;
case 4:
i = R.drawable.boy_iii;
break;
case 5:
i = R.drawable.girl_iii;
}
imgView.setImageResource(i);
}
else
{
imgView.setImageURI(Uri.fromFile(file));
}
final DuoDrawerLayout drawerLayout = findViewById(R.id.drawer);
DuoDrawerToggle drawerToggle = new DuoDrawerToggle(this, drawerLayout, toolbar,
R.string.navigation_drawer_open,
R.string.navigation_drawer_close);
drawerLayout.setDrawerListener(drawerToggle);
drawerToggle.syncState();
duoMenuView.setOnMenuClickListener(new DuoMenuView.OnMenuClickListener() {
@Override
public void onFooterClicked() {
// If the footer view contains a button
// it will launch this method on the button click.
// If the view does not contain a button it will listen
// to the root view click.
}
@Override
public void onHeaderClicked() {
}
@Override
public void onOptionClicked(int position, Object objectClicked) {
// Set the toolbar title
menuAdapter.setViewSelected(position, true);
if(position == 0)//Home
drawerLayout.closeDrawer();
else if(position == 1){//Profile
startActivity(new Intent(HomeScreen.this,Edit_Profile.class));
}
else if(position == 2){//Friends
drawerLayout.closeDrawer();
tabLayout.getTabAt(2).select();
}
else if(position == 3) {//Settings
}
else if(position == 4) {//Info
}
}
});
b.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
AlertDialog.Builder builder = new AlertDialog.Builder(HomeScreen.this);
builder.setTitle("Sign out?")
.setMessage("Do you want to sign out?\nYour personal messages will be deleted," +
" however your story and profile data will be saved unless you do not delete your account\nThis action cant be undone!")
.setPositiveButton("Sign-out", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int id) {
logout();
}
})
.setNeutralButton("Cancel", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialogInterface, int i) {
}
})
.create();
builder.show();
}
});
drawerLayout.openDrawer();
}
private void setupViewPager(ViewPager viewPager) {
ViewPagerAdapter adapter = new ViewPagerAdapter(getSupportFragmentManager());
adapter.addFragment(new fragment_story_list());
adapter.addFragment(new fragment_chat());
adapter.addFragment(new fragment_friends());
viewPager.setAdapter(adapter);
}
public void createStory(View view) {
startActivity(new Intent(this, CreateStory.class));
finish();
}
public void logout() {
File sharedPrefFiles = new File ("/data/data/"+getPackageName()+"/shared_prefs");
File[] FileList = sharedPrefFiles.listFiles();
for(File file: FileList) {
file.delete();
}
FirebaseAuth.getInstance().signOut();
GoogleSignIn.getClient(HomeScreen.this,new GoogleSignInOptions.Builder(GoogleSignInOptions.DEFAULT_SIGN_IN)
.requestIdToken(getString(R.string.default_web_client_id))
.requestEmail()
.build()).signOut();
Intent i = new Intent(HomeScreen.this, SplashScreenActivity.class);
startActivity(i);
finish();
}
class ViewPagerAdapter extends FragmentPagerAdapter {
private final List<Fragment> mFragmentList = new ArrayList<>();
ViewPagerAdapter(FragmentManager manager) {
super(manager);
}
@Override
public Fragment getItem(int position) {
return mFragmentList.get(position);
}
@Override
public int getCount() {
return mFragmentList.size();
}
void addFragment(Fragment fragment) {
mFragmentList.add(fragment);
}
@Override
public CharSequence getPageTitle(int position) {
return "";
}
}
private Bitmap StringToBitMap(String encodedString) {
try {
byte[] encodeByte = Base64.decode(encodedString, Base64.DEFAULT);
return BitmapFactory.decodeByteArray(encodeByte, 0, encodeByte.length);
} catch (Exception e) {
e.getMessage();
return null;
}
}
public void onDestroy() {
super.onDestroy();
}
public String getUID() {
return this.UID;
}
}
public class fragment_chat extends Fragment {
ArrayList<Chats_class> chatList;
RecyclerView chatList_rv;
LinearLayoutManager layoutManager;
RecyclerView.Adapter adapter;
DatabaseReference databaseRef, rootRef;
StorageReference storageReference;
SharedPreferences prefs_database;
ChildEventListener childEventListener;
File file;
public fragment_chat() {
// Required empty public constructor
}
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
prefs_database = Objects.requireNonNull(getContext()).getSharedPreferences(getString(R.string.USER_CHAT_DATA), MODE_PRIVATE);
chatList = getList();
rootRef = FirebaseDatabase.getInstance().getReference();
databaseRef = rootRef.child("CHAT_LISTS").child(((HomeScreen)this.getActivity()).getUID());
storageReference = FirebaseStorage.getInstance().getReference().child("USERS");
file = getContext().getFilesDir();
childEventListener = new ChildEventListener() {
@Override
public void onChildAdded(DataSnapshot dataSnapshot, String s) {
execute(dataSnapshot);
}
@Override
public void onChildChanged(DataSnapshot dataSnapshot, String s) {
execute(dataSnapshot);
}
@Override
public void onChildRemoved(DataSnapshot dataSnapshot) {
}
@Override
public void onChildMoved(DataSnapshot dataSnapshot, String s) {
}
@Override
public void onCancelled(DatabaseError databaseError) {
}
void execute(DataSnapshot dataSnapshot)
{
String info = dataSnapshot.getValue(String.class);
assert info != null;
String last_c = info.substring(info.indexOf("#") + 1);
int time;
try {
time = Integer.parseInt(info.substring(0, info.indexOf("#") - 1));
} catch (Exception ignore) {
time = 0;
}
getUserInfo_andSaveItToArrayList(dataSnapshot.getKey(), last_c, time);
}
};
databaseRef.addChildEventListener(childEventListener);
}
@Override
public void onResume() {
super.onResume();
}
@Override
public View onCreateView(
@NonNull LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState ) {
// Inflate the layout for this fragment
View view = inflater.inflate(R.layout.fragment_chat_home, container, false);
chatList_rv = view.findViewById(R.id.chat_list);
adapter = new Chat_Messages_Adapter(chatList, ((HomeScreen) Objects.requireNonNull(this.getActivity())).UID, Objects.requireNonNull(getContext()));
layoutManager = new LinearLayoutManager(this.getActivity());
layoutManager.setOrientation(LinearLayoutManager.VERTICAL);
chatList_rv.setLayoutManager(layoutManager);
chatList_rv.setAdapter(adapter);
return view;
}
private ArrayList<Chats_class> getList() {
Gson gson = new Gson();
ArrayList<Chats_class> productFromShared;
String jsonPreferences = prefs_database.getString(getString(R.string.USER_CHAT_HISTORY_ARRAY_LIST), "");
Type type = new TypeToken<ArrayList<Chats_class>>() {
}.getType();
productFromShared = gson.fromJson(jsonPreferences, type);
if (productFromShared == null) {
Toast.makeText(getContext(), "NO CHATS", Toast.LENGTH_LONG).show();
return new ArrayList<>();
}
return productFromShared;
}
//public static String BitMapToString(Bitmap bitmap) {
// ByteArrayOutputStream baos = new ByteArrayOutputStream();
// bitmap.compress(Bitmap.CompressFormat.PNG, 100, baos);
// byte[] b = baos.toByteArray();
// return Base64.encodeToString(b, Base64.DEFAULT);
//}
void getUserInfo_andSaveItToArrayList(final String uid, final String lastMsg, final int time) {
rootRef.child("USERS").child(uid).addListenerForSingleValueEvent(new ValueEventListener() {
@Override
public void onDataChange(DataSnapshot dataSnapshot) {
final UserData ud = dataSnapshot.getValue(UserData.class);
assert ud != null;
final Chats_class c = new Chats_class(ud.getIconID(), ud.getHasPic(), ud.getName(), lastMsg, uid, time);
if (ud.getHasPic() > 0) {
if(prefs_database.getLong(uid + "_profile_Last_Seen", 0) < ud.getHasPic()) {
c.setProfile(0);
sync_database(c);
c.setProfile(ud.getHasPic());
storageReference.child(uid).child("profile.jpg").getDownloadUrl().addOnSuccessListener(new OnSuccessListener<Uri>() {
@Override
public void onSuccess(final Uri uri) {
Glide.with(getContext()).load(uri.toString()).asBitmap().override(80,80).into(new SimpleTarget<Bitmap>() {
@Override
public void onResourceReady(Bitmap resource, GlideAnimation<? super Bitmap> glideAnimation) {
// you can do something with loaded bitmap here
SharedPreferences.Editor editor = prefs_database.edit();
FileOutputStream fos;
try {
fos = getContext().openFileOutput(uid+"_profile", MODE_PRIVATE);
resource.compress(Bitmap.CompressFormat.JPEG, 90, fos);
fos.close();
} catch (IOException e) {
e.printStackTrace();
}
editor.putLong(uid + "_profile_Last_Seen", ud.getHasPic());
editor.apply();
sync_database(c);
}
});
}
});
}
else
sync_database(c);
}
else if (ud.getHasPic() <= 0) {
SharedPreferences.Editor editor = prefs_database.edit();
editor.remove(uid + "_profile");
editor.apply();
sync_database(c);
}
}
@Override
public void onCancelled(DatabaseError databaseError) {
}
});
}
void sync_database(Chats_class chats) {
if(chatList.isEmpty()) {
chatList.add(chats);
adapter.notifyDataSetChanged();
}
else {
boolean found = false;
for (int i = 0; i < chatList.size(); i++) {
if (chatList.get(i).getUid().equals(chats.getUid())) {
if (!chatList.get(i).equals(chats)) {
chatList.set(i, chats);
adapter.notifyItemChanged(i);
}
found = true;
break;
}
}
if (!found) {
chatList.add(chats);
adapter.notifyItemInserted(chatList.size() - 1);
}
}
}
@Override
public void onPause() {
super.onPause();
}
@Override
public void onStop() {
super.onStop();
Application_Class.getRefWatcher((this.getActivity())).watch(this);
}
@Override
public void onDestroy() {
super.onDestroy();
databaseRef.removeEventListener(childEventListener);
childEventListener = null;
SharedPreferences.Editor prefsEditor = prefs_database.edit();
Gson gson = new Gson();
String json = gson.toJson(chatList);
prefsEditor.putString(getString(R.string.USER_CHAT_HISTORY_ARRAY_LIST), json);
prefsEditor.apply();
}
}