how to reduce .apk mmap size in my android app

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When i never open activity with webview, I dump my app meminfo,is like: 1

When i open an activity with webview, I dump my app meminfo,is like: 2 When i close this activity,the .apk mmap (Pss Total and Private Clean)is still very large. I have add and remove webview dynamically and called webview.ondestroy() when activity is destroyed. Why .apk mmap remains unchanged? What the .apk mmap means? Anyone can help me, Thanks!

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