Develop Reference

Android app consuming a lot of native heap space

I am trying to reduce the memory usage of my app.I started by fixing memory leaks in my code.This reduced the Dalvik heap space considerably but no difference in the native heap space allocated.
Is there a way I can reduce my native heap space consumption. If so, how should I go about doing it?
Heres what my app's heap dump looks like ""
Pss Private Private Swapped Heap Heap Heap
Total Dirty Clean Dirty Size Alloc Free
------ ------ ------ ------ ------ ------ ------
Native Heap 27240 27208 0 0 57344 24872 32471
Dalvik Heap 27138 26804 0 0 49430 41737 7693
Dalvik Other 624 624 0 0
Stack 924 924 0 0
Gfx dev 8738 5788 0 0
Other dev 16 0 16 0
.so mmap 833 332 124 0
.apk mmap 634 0 176 0
.ttf mmap 32 0 0 0
.dex mmap 12484 0 12480 0
.oat mmap 1146 0 124 0
.art mmap 1395 1212 4 0
Other mmap 44 4 0 0
Unknown 160 160 0 0
TOTAL 81408 63056 12924 0 106774 66609 40164
Objects
Views: 919 ViewRootImpl: 1
AppContexts: 3 Activities: 1
Assets: 214 AssetManagers: 214
Local Binders: 85 Proxy Binders: 22
Parcel memory: 24 Parcel count: 96
Death Recipients: 0 OpenSSL Sockets: 3
SQL
MEMORY_USED: 0
PAGECACHE_OVERFLOW: 0 MALLOC_SIZE: 0

Color selector for vector image doesn't work

I have a vector image (svg converted to xml):
<?xml version="1.0" encoding="utf-8"?>
<vector xmlns:android="http://schemas.android.com/apk/res/android" xmlns:better="http://schemas.android.com/apk/res-auto" xmlns:tools="http://schemas.android.com/tools"
tools:ignore="NewApi"
android:viewportWidth="24"
better:viewportWidth="24"
android:viewportHeight="24"
better:viewportHeight="24"
android:width="24dp"
android:height="24dp">
<path
android:pathData="M10.09 15.59l1.41 1.41 5 -5 -5 -5 -1.41 1.41 2.58 2.59 -9.67 0 0 2 9.67 0 -2.58 2.59zM19 3L5 3C3.89 3 3 3.9 3 5l0 4 2 0 0 -4 14 0 0 14 -14 0 0 -4 -2 0 0 4c0 1.1 0.89 2 2 2l14 0c1.1 0 2 -0.9 2 -2L21 5C21 3.9 20.1 3 19 3Z"
better:pathData="M10.09 15.59l1.41 1.41 5 -5 -5 -5 -1.41 1.41 2.58 2.59 -9.67 0 0 2 9.67 0 -2.58 2.59zM19 3L5 3C3.89 3 3 3.9 3 5l0 4 2 0 0 -4 14 0 0 14 -14 0 0 -4 -2 0 0 4c0 1.1 0.89 2 2 2l14 0c1.1 0 2 -0.9 2 -2L21 5C21 3.9 20.1 3 19 3Z"
android:fillColor="#color/menu_color_selector"
better:fillColor="#color/menu_color_selector" />
</vector>
But the color selector doesn't work. Is it possible to achieve what I am trying to do?

Try to use StateListDrawable with different VectorDrawable for each required state.

reduce the memory when starting a Service(EGL mtrack too big)

First I declared the Service at manifest:
<service android:name=".TestService"
android:process=":test">
</service>
Then, I create a Service that does nothing:
public class TestService extends Service{
#Nullable
#Override
public IBinder onBind(Intent intent) {
return null;
}
}
I started a Service with
mContext.startService(new Intent(mContext, TestService.class));
in my Application,then I found the memory usage in 'Runing App' (get there by settings-> apps-> running) is 24M.And here is the meminfo I got:
adb shell dumpsys meminfo com.mypush:test
Applications Memory Usage (kB):
Uptime: 79955214 Realtime: 87129943
** MEMINFO in pid 2452 [com.mypush:test] **
Pss Private Private Swapped Heap Heap Heap
Total Dirty Clean Dirty Size Alloc Free
------ ------ ------ ------ ------ ------ ------
Native Heap 2508 2468 0 0 12288 4916 7371
Dalvik Heap 1354 956 0 0 22320 16969 5351
Dalvik Other 400 400 0 0
Stack 136 136 0 0
Gfx dev 628 628 0 0
Other dev 4 0 4 0
.so mmap 860 336 4 0
.apk mmap 29 0 0 0
.ttf mmap 9 0 0 0
.dex mmap 156 0 4 0
.oat mmap 191 0 0 0
.art mmap 564 268 0 0
Other mmap 36 4 0 0
EGL mtrack 13888 13888 0 0
GL mtrack 3272 3272 0 0
Unknown 152 152 0 0
TOTAL 24187 22508 12 0 34608 21885 12722
Objects
Views: 0 ViewRootImpl: 0
AppContexts: 3 Activities: 0
Assets: 3 AssetManagers: 3
Local Binders: 8 Proxy Binders: 13
Parcel memory: 3 Parcel count: 12
Death Recipients: 2 OpenSSL Sockets: 0
SQL
MEMORY_USED: 0
PAGECACHE_OVERFLOW: 0 MALLOC_SIZE: 0
I am running on Android 5.0/Nexus5, and found some apps used a Service use less memory than mine.So I want to know why?
Update
I have found that the EGL mtrack dumped is about 13M, it is not normal for a app that only has a empty Service.

Generate Double Tap Event Android

How do i generate a double tap event on Android.
This is the implementation that i have done.
$event="/dev/event/event1"
$x=$1
$y=$2
sendevent $event 3 57 2421
sendevent $event 3 58 232
sendevent $event 3 53 $x
sendevent $event 3 54 $y
sendevent $event 0 0 0
sendevent $event 3 57 4294967295
sendevent $event 0 0 0
sendevent $event 3 57 2421
sendevent $event 3 58 232
sendevent $event 3 53 $x
sendevent $event 3 54 $y
sendevent $event 0 0 0
sendevent $event 3 57 4294967295
sendevent $event 0 0 0
With this implementation the double tap is slow that it appears as two separate single taps to the android system.
P.S: I tried these on Samsung Galaxy Nexus phone.

Why do you need to implement your custom double tab event? Maybe you can use SimpleOnGestureListener, this listener has method onDoubleTap(MotionEvent e)

Missing texture in .OBJ model on min3d framwork android

I am following this tuttorial:
http://www.mat-d.com/site/tutorial-load-a-3d-obj-model-with-min3d-for-android/
this is my mtl file:
newmtl Texture0
Ns 20
d 1
illum 2
map_Kd face_eyel_hi.jpg
Kd 0.7 0.7 0.7
Ks 0 0 0
Ka 0 0 0
newmtl Texture1
Ns 20
d 1
illum 2
map_Kd face_eyer_hi.jpg
Kd 0.7 0.7 0.7
Ks 0 0 0
Ka 0 0 0
newmtl Texture2
Ns 20
d 1
illum 2
map_Kd face_skin_hi.jpg
Kd 0.7 0.7 0.7
Ks 0 0 0
Ka 0 0 0
newmtl Texture3
Ns 20
d 1
illum 2
map_Kd face_sock.jpg
Kd 0.7 0.7 0.7
Ks 0 0 0
Ka 0 0 0
the obj file is in the last comment in the url i gave above
The texture is always missing can u tell me whats wrong ?
if u want to see the code check the url above.

i found whats wrong ,
the problem is in the tabulation of the mtl file,
just make sure that their is no indentation in the mtl file, and the texture will load perfectly
thank you !