Leak Canary is an Android and Java library used to detect leak in the application
You can see the example in link below
In your build.gradle you need to add the below dependencies:
debugCompile 'com.squareup.leakcanary:leakcanary-android:1.5.1'
releaseCompile 'com.squareup.leakcanary:leakcanary-android-no-op:1.5.1'
testCompile 'com.squareup.leakcanary:leakcanary-android-no-op:1.5.1'
In your Application class you need to add the below code inside your onCreate():
LeakCanary.install(this);
That's all you need to do for LeakCanary, it will automatically show notifications when there is a leak in your build.