Question

I had window leak in my application activity which i fixed. But, when i tested the app using Memory Analyzer Tool in android – Histogram View, i find 2 instances of my activity.

Class Name | Objects | Shallow Heap | Retained Heap

.MATDemoActivity. | | |
com.pace.mat.MATDemoActivity | 2 | 368 |

Total: 1 entry (2,195 filtered)| | |

Since there is no memory leak, how can it be 2 objects ? Kindly help me understand the data in MAT result …. Thanks in advance

Please find the complete code and the related discussion in this link.

Android Memoryleak in code

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I found that when i start from Activity 1st -> 2nd -> 1st. Shallow Heap of 1st activity class = 2 and 2nd activity class = 1 and when i move from 1st -> 2nd -> 1st -> 2nd … Shallow Heap of 1st activity class = 1 and 2nd activity class = 2.

So i tried with launch modes. i set android:launchMode=”singleTask” for all activities. Now shallow heap for both the activities are equal to number of times i navigate to the page. But since multiple instances are not allowed in this launch mode, why am i not getting the shallow heap object count as 1 ?

Please share your ideas which would help me understand this better.

Answer 1

In android, we can use Memory Analyser tool to capture the memory leaks(if any) in a particular code. We should generate the heap dump just before performing the operation responsible for leak and after completing the operation. Compare these 2 dumps and find which objects are taking memory and why it is not garbage collected.

In my case mentioned above, i rather than analysing the dump generated after going to 2nd activity, i tried to compare the dumps before and after the activity. I got the required results clearly.

Also, regarding MAT tool, it is good to try more than once and compare the dumps and choose a dump for analysis.

Thanks friends.