我不明白为什么这个非常简单的 Activity 会产生内存泄漏。
它遵循此处给出的指南:https://developer.android.com/training/location/receive-location-updates.html 和此处给出的示例代码:https://github.com/googlesamples/android-play-location/tree/master/LocationUpdates
我还注意到，如果我不重写 LocationCallback 类的 onLocationResult 方法，内存泄漏就会得到解决。 但在这种情况下，LocationCallback 就完全没用了。
感谢您的帮助!
public class TestLeaks extends Activity {
private FusedLocationProviderClient mFusedLocationClient; // Access to Fused Loc. Provider API
private LocationRequest mLocationRequest; // Stores parameters for requests to F.L.P.Api
private LocationCallback mLocationCallback; // Callback for Location events
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.test_leaks);
mFusedLocationClient = LocationServices.getFusedLocationProviderClient(this);
mLocationCallback = new LocationCallback() {
@Override
public void onLocationResult(LocationResult locationResult) {
super.onLocationResult(locationResult);
Location loc = locationResult.getLastLocation();
((TextView) findViewById(R.id.latitude)).setText(String.format(Locale.US, "%.6f", loc.getLatitude()));
((TextView) findViewById(R.id.longitude)).setText(String.format(Locale.US, "%.6f", loc.getLongitude()));
}
};
mLocationRequest = new LocationRequest()
.setInterval(5000)
.setFastestInterval(2000)
.setPriority(LocationRequest.PRIORITY_HIGH_ACCURACY);
}
@SuppressLint("MissingPermission")
@Override
public void onResume() {
super.onResume();
mFusedLocationClient.requestLocationUpdates(mLocationRequest, mLocationCallback, Looper.myLooper());
}
@Override
protected void onPause() {
super.onPause();
mFusedLocationClient.removeLocationUpdates(mLocationCallback);
}
@Override
protected void onDestroy() {
super.onDestroy();
mLocationCallback = null;
}
}
这是 LeakCanary 关于检测到的内存泄漏的输出:
In it.myapp.app:1.0.4:10004.
* it.myapp.app.activities.TestLeaks has leaked:
* GC ROOT com.google.android.gms.internal.zzcfe.zzfus
* references com.google.android.gms.common.api.internal.zzci.zzful
* references com.google.android.gms.common.api.internal.zzck.zzfuk
* references it.myapp.app.activities.TestLeaks$1.this$0 (anonymous subclass of com.google.android.gms.location.LocationCallback)
* leaks it.myapp.app.activities.TestLeaks instance
* Retaining: 35 KB.
* Reference Key: 969b4256-81ff-4b01-b0d4-63e27e49b764
* Device: samsung samsung SM-G920F zerofltexx
* Android Version: 7.0 API: 24 LeakCanary: 1.5.4 74837f0
* Durations: watch=637463ms, gc=258ms, heap dump=2766ms, analysis=46757ms
* Details:
* Instance of com.google.android.gms.internal.zzcfe
| static $classOverhead = byte[768]@317861889 (0x12f23001)
| zzfus = com.google.android.gms.common.api.internal.zzci@318105032 (0x12f5e5c8)
| mDescriptor = java.lang.String@317290744 (0x12e978f8)
| mObject = 511599546432
| mOwner = com.google.android.gms.internal.zzcfe@317359520 (0x12ea85a0)
| shadow$_klass_ = com.google.android.gms.internal.zzcfe
| shadow$_monitor_ = 0
* Instance of com.google.android.gms.common.api.internal.zzci
| static $classOverhead = byte[648]@316776449 (0x12e1a001)
| zzfuj = com.google.android.gms.common.api.internal.zzcj@317594368 (0x12ee1b00)
| zzfuk = null
| zzful = com.google.android.gms.common.api.internal.zzck@318185888 (0x12f721a0)
| shadow$_klass_ = com.google.android.gms.common.api.internal.zzci
| shadow$_monitor_ = 0
* Instance of com.google.android.gms.common.api.internal.zzck
| static $classOverhead = byte[608]@316789761 (0x12e1d401)
| zzfuk = it.myapp.app.activities.TestLeaks$1@318185648 (0x12f720b0)
| zzfun = java.lang.String@317049344 (0x12e5ca00)
| shadow$_klass_ = com.google.android.gms.common.api.internal.zzck
| shadow$_monitor_ = 0
* Instance of it.myapp.app.activities.TestLeaks$1
| static $classOverhead = byte[640]@316606465 (0x12df0801)
| static serialVersionUID = -1641506329145588052
| static $change = null
| this$0 = it.myapp.app.activities.TestLeaks@317686496 (0x12ef82e0)
| shadow$_klass_ = it.myapp.app.activities.TestLeaks$1
| shadow$_monitor_ = -1897236332
* Instance of it.myapp.app.activities.TestLeaks
| static $classOverhead = byte[4336]@316567553 (0x12de7001)
| static serialVersionUID = 2740572635131010457
| static $change = null
| mFusedLocationClient = com.google.android.gms.location.FusedLocationProviderClient@317049680 (0x12e5cb50)
| mLocationCallback = null
| mLocationRequest = com.google.android.gms.location.LocationRequest@318159496 (0x12f6ba88)
| mActionBar = null
| mActionModeTypeStarting = 0
| mActivityInfo = android.content.pm.ActivityInfo@317696896 (0x12efab80)
| mActivityTransitionState = android.app.ActivityTransitionState@317736656 (0x12f046d0)
| mAppLockCheckRunnable = android.app.Activity$1@318057504 (0x12f52c20)
| mAppLockIsInMultiWindowMode = false
| mApplication = it.myapp.app.CanaryLeak@315492064 (0x12ce06e0)
| mCalled = true
| mChangeCanvasToTranslucent = false
| mChangingConfigurations = false
| mComponent = android.content.ComponentName@318099536 (0x12f5d050)
| mConfigChangeFlags = 0
| mCurrentConfig = android.content.res.Configuration@317764560 (0x12f0b3d0)
| mDecor = null
| mDefaultKeyMode = 0
| mDefaultKeySsb = null
| mDestroyed = true
| mDoReportFullyDrawn = false
| mEatKeyUpEvent = false
| mEmbeddedID = null
| mEnableDefaultActionBarUp = false
| mEnterTransitionListener = android.app.SharedElementCallback$1@1899179144 (0x71332c88)
| mExitTransitionListener = android.app.SharedElementCallback$1@1899179144 (0x71332c88)
| mFinished = true
| mFlipfont = 0
| mFragments = android.app.FragmentController@318057472 (0x12f52c00)
| mHandler = android.os.Handler@317542688 (0x12ed5120)
| mHasCurrentPermissionsRequest = false
| mIdent = 165309401
| mInstanceTracker = android.os.StrictMode$InstanceTracker@318057488 (0x12f52c10)
| mInstrumentation = android.app.Instrumentation@315494968 (0x12ce1238)
| mIntent = android.content.Intent@314929344 (0x12c570c0)
| mLastNonConfigurationInstances = null
| mMainThread = android.app.ActivityThread@315314736 (0x12cb5230)
| mManagedCursors = java.util.ArrayList@318035832 (0x12f4d778)
| mManagedDialogs = null
| mMenuInflater = null
| mParent = null
| mPolicyManager = null
| mReferrer = java.lang.String@314929856 (0x12c572c0)
| mResultCode = 0
| mResultData = null
| mResumed = false
| mScreenChangeListener = null
| mSearchEvent = null
| mSearchManager = null
| mStartedActivity = false
| mStopped = true
| mTaskDescription = android.app.ActivityManager$TaskDescription@317542720 (0x12ed5140)
| mTemporaryPause = false
| mTitle = java.lang.String@315505152 (0x12ce3a00)
| mTitleColor = 0
| mTitleReady = true
| mToken = android.os.BinderProxy@315387808 (0x12cc6fa0)
| mTranslucentCallback = null
| mUiThread = java.lang.Thread@2004343960 (0x7777dc98)
| mVisibleBehind = false
| mVisibleFromClient = true
| mVisibleFromServer = true
| mVoiceInteractor = null
| mWindow = com.android.internal.policy.PhoneWindow@315451968 (0x12cd6a40)
| mWindowAdded = true
| mWindowManager = android.view.WindowManagerImpl@318034248 (0x12f4d148)
| mInflater = com.android.internal.policy.PhoneLayoutInflater@316645632 (0x12dfa100)
| mOverrideConfiguration = null
| mResources = android.content.res.Resources@316047040 (0x12d67ec0)
| mTheme = android.content.res.Resources$Theme@318057696 (0x12f52ce0)
| mThemeResource = 2131820551
| mBase = android.app.ContextImpl@316473008 (0x12dcfeb0)
| shadow$_klass_ = it.myapp.app.activities.TestLeaks
| shadow$_monitor_ = 1073742768
* Excluded Refs:
| Field: android.view.inputmethod.InputMethodManager.mNextServedView
| Field: android.view.inputmethod.InputMethodManager.mServedView
| Field: android.view.inputmethod.InputMethodManager.mServedInputConnection
| Field: android.view.textservice.SpellCheckerSession$1.this$0
| Field: com.samsung.android.content.clipboard.SemClipboardManager.mContext
| Field: com.samsung.android.emergencymode.SemEmergencyManager.mContext
| Field: android.view.Choreographer$FrameDisplayEventReceiver.mMessageQueue (always)
| Thread:FinalizerWatchdogDaemon (always)
| Thread:main (always)
| Thread:LeakCanary-Heap-Dump (always)
| Class:java.lang.ref.WeakReference (always)
| Class:java.lang.ref.SoftReference (always)
| Class:java.lang.ref.PhantomReference (always)
| Class:java.lang.ref.Finalizer (always)
| Class:java.lang.ref.FinalizerReference (always)
最佳答案
我遇到了同样的问题，然后是我的固定代码，如果需要的话给别人。
class WeakLocationCallback(locationCallback: LocationCallback) : LocationCallback() {
private val weakLocationCallback = WeakReference<LocationCallback>(locationCallback)
override fun onLocationResult(result: LocationResult) {
super.onLocationResult(result)
weakLocationCallback.get()?.onLocationResult(result)
}
}
和
fusedLocationClient = LocationServices.getFusedLocationProviderClient(this)
val locationRequest = LocationRequest()
locationRequest.priority = LocationRequest.PRIORITY_BALANCED_POWER_ACCURACY
locationCallback = object : LocationCallback() {
override fun onLocationResult(result: LocationResult) {
super.onLocationResult(result)
currentLocation = result.lastLocation
}
}
val weakLocationCallback = WeakLocationCallback(locationCallback)
fusedLocationClient.requestLocationUpdates(locationRequest, weakLocationCallback, Looper.myLooper())
关于android - 使用 FusedLocationProviderClient 进行位置更新会产生内存泄漏，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/48675221/
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