我正在使用Firebase开发一个Android类型的图库应用程序，所以我将有大量的图像。我知道我需要小心内存管理。
当我在Android应用中搜索如何查找内存泄漏时，我遇到了LeakCanary。它看起来真的很棒，所以我在我的应用程序中使用。
基本上我的应用程序有3个片段，分别是Drawer，ProductGrid和ProductDetail。有时LeakCanary说我在ProductGrid中有内存泄漏，但我找不到它！通常，由于Context对象，适配器或静态方法或侦听器可能会导致内存泄漏，但我的知识不足以说'因为在这里'是的'
以下是课程。泄漏在哪里？（如果你建议我改进我的代码或方法，我将不胜感激！）
由于身体角色限制，我将link泄漏金丝雀日志文件。
我怀疑是否存在内存泄漏
首先，LeakCanary会显示一个对话框并记录转储。第二件事是，当我点击抽屉中的项目，在网格中并且在细节上分别15次（分别）时，内存使用量会增加。它以18M开始，在显示3张图像（正常）后增加22M-23M。然后在点击15次后达到29M-30M。如果你点击大约30-40，内存使用量增加34M-35M
编辑：我刚想通了，如果我打开和关闭抽屉，每次内存使用量增加0.05M，所以一次打开和关闭抽屉的成本为0.1M！我错过了什么？
Main.java
public class Main extends ActionBarActivity implements DrawerListener {
private Toolbar mToolbar;
private Drawer drawerFragment;
private HomePage homeFragment;
private FragmentHelper fh = new FragmentHelper();
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
if (homeFragment == null)
homeFragment = new HomePage();
if (savedInstanceState == null) {
mToolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(mToolbar);
getSupportActionBar().setDisplayShowHomeEnabled(true);
drawerFragment = (Drawer)
getSupportFragmentManager().findFragmentById(R.id.navigation_drawer);
drawerFragment.setUp(R.id.navigation_drawer,
(DrawerLayout) findViewById(R.id.drawer_layout), mToolbar);
drawerFragment.setDrawerListener(this);
drawerFragment.setRetainInstance(true);
displayView(null);
}
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
getMenuInflater().inflate(R.menu.menu_main, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
int id = item.getItemId();
if (id == R.id.action_home) {
getSupportActionBar().setTitle(getString(R.string.app_name));
fh.replace(getSupportFragmentManager(), homeFragment, R.id.container_body);
return true;
}
if (id == R.id.action_settings) {
return true;
}
if (id == R.id.action_search) {
Toast.makeText(getApplicationContext(), "Search action is selected!", Toast.LENGTH_SHORT).show();
return true;
}
return super.onOptionsItemSelected(item);
}
@Override
public void onDrawerItemSelected(View view, int position, Category category) {
displayView(category);
}
private void displayView(Category category) {
if (category != null) {
getSupportActionBar().setTitle(category.getName());
ProductGrid gridFragment = new ProductGrid();
Bundle args = new Bundle();
args.putString(Product.CATEGORY_ID, category.getId());
gridFragment.setArguments(args);
fh.replace(getSupportFragmentManager(), gridFragment, R.id.container_body);
} else {
getSupportActionBar().setTitle(getString(R.string.app_name));
fh.replace(getSupportFragmentManager(), homeFragment, R.id.container_body);
}
}
}
Drawer.java
public class Drawer extends Fragment {
private Firebase mFirebase;
private Alert alert;
private RecyclerView recyclerView;
private View containerView;
private DrawerLayout mDrawerLayout;
private ActionBarDrawerToggle mDrawerToggle;
private DrawerListener drawerListener;
private DrawerAdapter mAdapter;
private List<Category> mCategories;
public Drawer() {
}
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
alert = new Alert(getActivity().getApplicationContext());
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View layout = inflater.inflate(R.layout.drawer, container, false);
mCategories = new ArrayList<>();
mAdapter = new DrawerAdapter(mCategories);
recyclerView = (RecyclerView) layout.findViewById(R.id.drawer_list);
recyclerView.setLayoutManager(new LinearLayoutManager(getActivity().getApplicationContext()));
recyclerView.setItemAnimator(new SlideInOutLeftItemAnimator(recyclerView));
recyclerView.setAdapter(mAdapter);
mFirebase = new Firebase(getActivity().getResources().getString(R.string.firebase_ref))
.child(FirebaseRoots.CATEGORY);
Query query = mFirebase.orderByChild(Category.PRIO);
query.addChildEventListener(new ChildEventListener() {
@Override
public void onChildAdded(DataSnapshot dataSnapshot, String s) {
Category model = dataSnapshot.getValue(Category.class);
model.setId(dataSnapshot.getKey());
mCategories.add(model);
recyclerView.scrollToPosition(mCategories.size() - 1);
mAdapter.notifyItemInserted(mCategories.size() - 1);
}
@Override
public void onChildChanged(DataSnapshot dataSnapshot, String s) {
Category model = dataSnapshot.getValue(Category.class);
model.setId(dataSnapshot.getKey());
int index = -1;
for (int i = 0; i < mCategories.size(); i++) {
if (mCategories.get(i).getId().equals(model.getId())) {
index = i;
break;
}
}
mCategories.set(index, model);
recyclerView.scrollToPosition(0);
mAdapter.notifyItemChanged(index);
}
@Override
public void onChildRemoved(DataSnapshot dataSnapshot) {
Category model = dataSnapshot.getValue(Category.class);
model.setId(dataSnapshot.getKey());
int index = -1;
for (int i = 0; i < mCategories.size(); i++) {
if (mCategories.get(i).getId().equals(model.getId())) {
index = i;
break;
}
}
mCategories.remove(index);
recyclerView.scrollToPosition(0);
mAdapter.notifyItemRemoved(index);
}
@Override
public void onChildMoved(DataSnapshot dataSnapshot, String s) {
}
@Override
public void onCancelled(FirebaseError firebaseError) {
alert.show(firebaseError.toString());
}
});
recyclerView.addOnItemTouchListener(new RecyclerTouchListener(getActivity().getApplicationContext(),
recyclerView, new ClickListener() {
@Override
public void onClick(View view, int position) {
Category category = mCategories.get(position);
drawerListener.onDrawerItemSelected(view, position, category);
mDrawerLayout.closeDrawer(containerView);
}
@Override
public void onLongClick(View view, int position) {
}
}));
return layout;
}
public void setUp(int fragmentId, DrawerLayout drawerLayout, final Toolbar toolbar) {
containerView = getActivity().findViewById(fragmentId);
mDrawerLayout = drawerLayout;
mDrawerToggle = new ActionBarDrawerToggle(getActivity(), drawerLayout, toolbar, R.string.drawer_open, R.string.drawer_close) {
@Override
public void onDrawerOpened(View drawerView) {
super.onDrawerOpened(drawerView);
getActivity().invalidateOptionsMenu();
}
@Override
public void onDrawerClosed(View drawerView) {
super.onDrawerClosed(drawerView);
getActivity().invalidateOptionsMenu();
}
@Override
public void onDrawerSlide(View drawerView, float slideOffset) {
super.onDrawerSlide(drawerView, slideOffset);
toolbar.setAlpha(1 - slideOffset / 2);
}
};
mDrawerLayout.setDrawerListener(mDrawerToggle);
mDrawerLayout.post(new Runnable() {
@Override
public void run() {
mDrawerToggle.syncState();
}
});
}
public void setDrawerListener(DrawerListener listener) {
this.drawerListener = listener;
}
}
ProductGrid.java
public class ProductGrid extends Fragment implements ChildEventListener{
private Firebase mFirebaseRef;
private Alert alert;
private RecyclerView recyclerView;
private GridAdapter mAdapter;
private String categoryId;
private ArrayList<Product> mProducts;
private FileSystem fs;
public ProductGrid() {
}
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
this.categoryId = getArguments().getString(Product.CATEGORY_ID);
this.alert = new Alert(getActivity().getApplicationContext());
this.fs = new FileSystem(getActivity().getApplicationContext());
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View layout = inflater.inflate(R.layout.grid, container, false);
fieldInitialize(layout);
mProducts = new ArrayList<>();
mAdapter = new GridAdapter(mProducts, getActivity().getApplicationContext());
recyclerView.addItemDecoration(new MarginDecoration(getActivity()));
recyclerView.setHasFixedSize(true);
recyclerView.setLayoutManager(new GridLayoutManager(getActivity(), 2));
recyclerView.setAdapter(mAdapter);
mFirebaseRef = new Firebase(getActivity().getResources().getString(R.string.firebase_ref))
.child(FirebaseRoots.PRODUCT);
Query query = mFirebaseRef.orderByChild(Product.CATEGORY_ID).equalTo(categoryId);
query.addChildEventListener(this);
recyclerView.addOnItemTouchListener(new RecyclerTouchListener(getActivity(), recyclerView, new ClickListener() {
@Override
public void onClick(View view, int position) {
ProductDetail detailFragment = new ProductDetail();
Bundle args = new Bundle();
args.putSerializable("product", mProducts);
args.putInt("position", position);
detailFragment.setArguments(args);
FragmentTransaction transaction = getFragmentManager().beginTransaction();
transaction.replace(R.id.container_body, detailFragment);
transaction.addToBackStack(null);
transaction.commit();
}
@Override
public void onLongClick(View view, int position) {
}
}));
return layout;
}
@Override
public void onAttach(Activity activity) {
super.onAttach(activity);
}
@Override
public void onDetach() {
super.onDetach();
}
public void fieldInitialize(View layout) {
recyclerView = (RecyclerView) layout.findViewById(R.id.product_grid_layout);
}
@Override
public void onChildAdded(DataSnapshot dataSnapshot, String s) {
Product model = dataSnapshot.getValue(Product.class);
model.setId(dataSnapshot.getKey());
mProducts.add(model);
if (!fs.getFileNames().contains(model.getName() + FileExt.JPG.get())) {
fs.writeImage(model.getName(), ImageUtil.base64ToBitmap(
StringUtil.getBase64FromUrl(model.getImageData().getDataUrl())));
}
Collections.sort(mProducts);
recyclerView.scrollToPosition(0);
mAdapter.notifyItemInserted(mProducts.size() - 1);
}
@Override
public void onChildChanged(DataSnapshot dataSnapshot, String s) {
Product model = dataSnapshot.getValue(Product.class);
model.setId(dataSnapshot.getKey());
fs.writeImage(model.getName(), ImageUtil.base64ToBitmap(
StringUtil.getBase64FromUrl(model.getImageData().getDataUrl())));
int index = -1;
for (int i = 0; i < mProducts.size(); i++) {
if (mProducts.get(i).getId().equals(model.getId())) {
index = i;
break;
}
}
mProducts.set(index, model);
recyclerView.scrollToPosition(0);
mAdapter.notifyItemChanged(index);
}
@Override
public void onChildRemoved(DataSnapshot dataSnapshot) {
Product model = dataSnapshot.getValue(Product.class);
model.setId(dataSnapshot.getKey());
fs.deleteImage(model.getName());
int index = -1;
for (int i = 0; i < mProducts.size(); i++) {
if (mProducts.get(i).getId().equals(model.getId())) {
index = i;
break;
}
}
mProducts.remove(index);
recyclerView.scrollToPosition(0);
mAdapter.notifyItemRemoved(index);
}
@Override
public void onChildMoved(DataSnapshot dataSnapshot, String s) {
}
@Override
public void onCancelled(FirebaseError firebaseError) {
alert.show(firebaseError.toString());
}
@Override public void onDestroy() {
super.onDestroy();
RefWatcher refWatcher = AcarsanApp.getRefWatcher(getActivity());
refWatcher.watch(this);
}
}
ProductDetail.java
public class ProductDetail extends Fragment {
private FullScreenImageAdapter adapter;
private ViewPager viewPager;
private ArrayList<Product> products;
private int position;
public ProductDetail() {
}
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
products = (ArrayList<Product>) getArguments().getSerializable("product");
position = getArguments().getInt("position");
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.product_detail, container, false);
viewPager = (ViewPager) view.findViewById(R.id.product_gallery);
adapter = new FullScreenImageAdapter(getActivity().getApplicationContext(), products);
viewPager.setAdapter(adapter);
viewPager.setCurrentItem(position);
return view;
}
@Override
public void onAttach(Activity activity) {
super.onAttach(activity);
}
@Override
public void onDetach() {
super.onDetach();
}
}
文件系统
public class FileSystem {
private Context mContext;
public static final String PHOTOS_FOLDER = "photos";
public FileSystem(Context mContext) {
this.mContext = mContext;
}
public void writeImage(String name, Bitmap bitmap) {
String filename = name + FileExt.JPG.get();
File dir = mContext.getDir(PHOTOS_FOLDER, Context.MODE_PRIVATE);
File fileWithinDir = new File(dir, filename);
FileOutputStream outputStream;
try {
outputStream = new FileOutputStream(fileWithinDir);
bitmap.compress(Bitmap.CompressFormat.JPEG, 100, outputStream);
outputStream.close();
} catch (Exception e) {
e.printStackTrace();
}
}
public List<String> getFileNames() {
List<String> fileNames = new ArrayList<>();
File file = mContext.getDir(PHOTOS_FOLDER, Context.MODE_PRIVATE);
File[] files = file.listFiles();
for (File f : files) {
fileNames.add(f.getName());
}
return fileNames;
}
}
ImageUtil
public class ImageUtil {
public static Bitmap base64ToBitmap(String encodedImage) {
if (encodedImage == null)
return null;
byte[] decodedString = Base64.decode(encodedImage, Base64.DEFAULT);
return BitmapFactory.decodeByteArray(decodedString, 0, decodedString.length);
}
}