Leakcanary Android and Java memory leak detection.

Start using

In build.gradle addition to the references, different compilations use different references:

 dependencies {   debugCompile ‘com.squareup.leakcanary:leakcanary-android:1.3‘   releaseCompile ‘com.squareup.leakcanary:leakcanary-android-no-op:1.3‘ }

In the Application :

public class ExampleApplication extends Application { @Override public void onCreate() { super.onCreate(); LeakCanary.install(this); }}

How to use

Use RefWatcher to monitor those objects that should be recycled.

RefWatcher refWatcher = {...};// 监控refWatcher.watch(schrodingerCat);

LeakCanary.install()will return a predefined activity that is RefWatcher also enabled ActivityRefWatcher for automatic monitoring after a call is Activity.onDestroy() released.

PublicClassExampleapplicationExtendsApplication{PublicStaticRefwatcherGetrefwatcher(ContextContext){ExampleapplicationApplication=(Exampleapplication)context. (); return application. Refwatcher} private refwatcher refwatcher @Override public void oncreate  () {super. Oncreate (); refwatcher = leakcanary. Install (this}             /span>                

Using RefWatcher monitoring Fragment:

Publicabstract class basefragment extends Fragment { @Override public void ondestroy< c10> () { Super.  OnDestroy(); refwatcher refwatcher = exampleapplication.  Getrefwatcher(getactivity()); refwatcher.  Watch(this); }}< /c14> 

Working mechanism

1. RefWatcher.watch()Create a keyedweakreference to the object to be monitored.

2. Then the background thread checks if the reference is cleared, and if not, the GC is called.

3. If the reference is still not cleared, dump the heap memory into a file in the APP's file system .hprof .

4. There is one in another process that HeapAnalyzerService HeapAnalyzer uses haha to parse this file.

5. Thanks to the unique reference key, HeapAnalyzer locate KeyedWeakReference and locate the memory leak.

6. HeapAnalyzerCalculates the shortest strong reference path to the GC roots and determines whether it is a leak. If so, establish a chain of references that leads to leaks.

7. The reference chain is passed into the APP process and is displayed in the DisplayLeakService form of notifications.

Leakcanary Android and Java memory leak detection.