接手了一个屎坑代码 在有限的改动下修改泄漏问题
以下是我收集的一下泄漏问题及修改办法
常见的内存泄漏主要有以下4种
1.“静态实例” 造成内存泄漏
┬───
│ GC Root: System class
│
├─ android.net.ConnectivityManager class
│ Leaking: NO (a class is never leaking)
│ ↓ static ConnectivityManager.sInstance
│ ~~~~~~~~~
├─ android.net.ConnectivityManager instance
│ Leaking: UNKNOWN
│ Retaining 114 B in 5 objects
│ mContext instance of com.MainActivity with mDestroyed = true
│ ↓ ConnectivityManager.mContext
│ ~~~~~~~~
╰→ com.MainActivity instance
Leaking: YES (ObjectWatcher was watching this because com.MainActivity received
Activity#onDestroy() callback and Activity#mDestroyed is true)
Retaining 27.8 MB in 17166 objects
key = ecff8e2d-70c4-4cbf-99f1-d02005ddd4f2
watchDurationMillis = 7209
retainedDurationMillis = 2207
mApplication instance of com.Application
mBase instance of androidx.appcompat.view.ContextThemeWrapper
实际代码和修改办法
这种的改法其实和很简单只要getApplicationContext即可
原因你这个方法都是静态的如果你传入的Context是非Application的那么它将会因为这个静态而不会释放 所以只要改成Application Context即可
另外一种DialogFragment引起的泄漏
DialogFragment泄漏
这种就极其脑抽 解决也很简单 首先DialogFragment这玩意是个Fragment 也就是说他有自己的Context
写法和改法
正常是Dialog里面持有外部的Context 比如 有个静态的Context常量 这是我们正常的理解
但是这东西就反过来这是外部持有了另外一个伪装的Fragment 所以解决办法就是给他搞个弱应用或者匿名对象
GC Root: Input or output parameters in native code
├─ dalvik.system.PathClassLoader instance
│ Leaking: NO (m↓ is not leaking and A ClassLoader is never leaking)
│ ↓ ClassLoader.runtimeInternalObjects
┬───
│ GC Root: Global variable in native code
│
├─ dalvik.system.PathClassLoader instance
│ Leaking: NO (IntentUtil↓ is not leaking and A ClassLoader is never leaking)
│ ↓ ClassLoader.runtimeInternalObjects
├─ java.lang.Object[] array
│ Leaking: NO (IntentUtil↓ is not leaking)
│ ↓ Object[4169]
├─ com.IntentUtil class
│ Leaking: NO (a class is never leaking)
│ ↓ static IntentUtil.context
│ ~~~~~~~
╰→ com.MineMdActivity instance
Leaking: YES (ObjectWatcher was watching this because com.miaodou.
MineMdActivity received Activity#onDestroy() callback and Activity#mDestroyed is true)
Retaining 9.7 MB in 2450 objects
key = 366658d5-9533-4aa5-85ed-1397537a9089
watchDurationMillis = 31774
retainedDurationMillis = 26773
mContractView instance of com.miaodou.MineMdActivity with mDestroyed = true
context instance of com.MineMdActivity with mDestroyed = true
mApplication instance of com.sbds.secondvoice.MiaoyinApplication
mBase instance of androidx.appcompat.view.ContextThemeWrapper
这就是大聪明
为了静态初始化 为了个单例 写成这样 另外我也实在不懂一个Intent也要写个单例工具类干嘛 警告都不看
很多程序员有一个坏习惯 警告都觉得无所谓 实际上很多问题很难解决找不到原因 就是警告没解决
解决办法也简单 不要单例 不要静态即可
┬───
│ GC Root: Thread object
│
├─ java.lang.Thread instance
│ Leaking: NO (the main thread always runs)
│ Thread name: 'main'
│ ↓ Thread.threadLocals
│ ~~~~~~~~~~~~
├─ java.lang.ThreadLocal$ThreadLocalMap instance
│ Leaking: UNKNOWN
│ Retaining 7.4 kB in 74 objects
│ ↓ ThreadLocal$ThreadLocalMap.table
│ ~~~~~
├─ java.lang.ThreadLocal$ThreadLocalMap$Entry[] array
│ Leaking: UNKNOWN
│ Retaining 7.3 kB in 73 objects
│ ↓ ThreadLocal$ThreadLocalMap$Entry[18]
│ ~~~~
├─ java.lang.ThreadLocal$ThreadLocalMap$Entry instance
│ Leaking: UNKNOWN
│ Retaining 28 B in 1 objects
│ ↓ ThreadLocal$ThreadLocalMap$Entry.value
│ ~~~~~
├─ android.animation.AnimationHandler instance
│ Leaking: UNKNOWN
│ Retaining 5.0 MB in 7251 objects
│ ↓ AnimationHandler.mAnimationCallbacks
│ ~~~~~~~~~~~~~~~~~~~
├─ java.util.ArrayList instance
│ Leaking: UNKNOWN
│ Retaining 5.0 MB in 7247 objects
│ ↓ ArrayList[0]
│ ~~~
├─ android.animation.ObjectAnimator instance
│ Leaking: UNKNOWN
│ Retaining 5.0 MB in 7245 objects
│ mListeners = null
│ mPropertyName = rotation
│ mProperty = null
│ mInitialized = true
│ mStarted = true
│ mRunning = true
│ mAnimationEndRequested = false
│ mDuration = 3000
│ mStartDelay = 0
│ mRepeatCount = INFINITE (-1)
│ mRepeatMode = RESTART (1)
│ ↓ ObjectAnimator.mTarget
│ ~~~~~~~
├─ androidx.appcompat.widget.AppCompatImageView instance
│ Leaking: YES (View.mContext references a destroyed activity)
│ Retaining 5.0 MB in 7231 objects
│ View not part of a window view hierarchy
│ View.mAttachInfo is null (view detached)
│ View.mID = R.id.iv_record
│ View.mWindowAttachCount = 0
│ mContext instance of com.ShortVideoMainActivity with mDestroyed = true
│ ↓ View.mContext
╰→ com.ShortVideoMainActivity instance
Leaking: YES (ObjectWatcher was watching this because com.ShortVideoMainActivity
received Activity#onDestroy() callback and Activity#mDestroyed is true)
Retaining 64.8 kB in 1152 objects
key = e14565c2-166a-4e0a-9dd3-07f981f9f18d
watchDurationMillis = 5820
retainedDurationMillis = 819
context instance of com.ShortVideoMainActivity with mDestroyed = true
mApplication instance of com.Application
mBase instance of androidx.appcompat.view.ContextThemeWrapper
查找问题发生位置
我们就能很快速的找到那个类 根据 View.mID = R.id.iv_record 知道那个控件泄漏并定位到代码
rotation = ObjectAnimator.ofFloat(ivRecord, "rotation", 0, 360f);
rotation.setRepeatCount(ValueAnimator.INFINITE);
rotation.setRepeatMode(ValueAnimator.RESTART);
rotation.setInterpolator(new LinearInterpolator());
rotation.setDuration(3000).start();
解决方案 :
然后看代码 这个ObjectAnimator是一直在播放所以我们应该在页面销毁的时候cancel掉他
但是好巧不巧这玩意是在adapter里面的一个自定义view 那么怎么释放呢
应该这样重写onDetachedFromWindow方法然后释放
@Override
protected void onDetachedFromWindow() {
rotation.cancel();
super.onDetachedFromWindow();
}