Android View.invalidate(Rect) different behavior between two devices -


i have custom view (a waveform) needs synchronized media player progress. problem i'm having different behavior when using invalidate(rect) here code makes update in custom view:

public void setprogress(int currentduration) {     // ... code calculate dirty width     invalidate(mdirtywidth,0,mdirtywidth+ mdirtywidthregion, viewheight); }

this working on samsung galaxy 4 (android 4.4.2). screenshot "show gpu view updates" enabled

enter image description here

but in nexus 7 (android 5.1), whole view gets invalidated each time: enter image description here

after android 5.0, canvas clipbounds view bounds hardwareaccelerated, invalidate(dirty rect)'s dirty rect ignored

5.0 viewrootimpl.java http://grepcode.com/file/repository.grepcode.com/java/ext/com.google.android/android/5.0.0_r1/android/view/viewrootimpl.java/

            dirty.setempty();             mblockresizebuffer = false;             mattachinfo.mhardwarerenderer.draw(mview, mattachinfo, this);

4.4 viewrootimpl.java http://grepcode.com/file_/repository.grepcode.com/java/ext/com.google.android/android/4.4.2_r1/android/view/viewrootimpl.java/?v=source

            mcurrentdirty.set(dirty);             dirty.setempty();             attachinfo.mhardwarerenderer.draw(mview, attachinfo, this,                     animating ? null : mcurrentdirty);

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