android - 2D Game, Performance Improvements? -

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the game i'm developing progressing, more , more elements being added, i'm of course facing new problems, 1 of performance.

currently, i'm having 3 threads, 2 of perform calculations, other 1 updates canvas. these 3 threads synchronized cyclicbarrier, have calculations finished when beginning draw canvas.

i'm using several bitmaps in different sizes. in drawing method, bitmaps being rotated (by using drawbitmap-matrix combination scaling/translating/rotating added matrix "native" (i guess) management of it) , of course drawn. problem facing whenever have many "moving , rotating" elements on screen, gets choppy. 

matrix matrix = new matrix(); matrix.settranslate(view.getx(), view.gety()); matrix.prescale((1.0f * view.getwidth() / view.getcurrentbitmap().getwidth()), (1.0f * view.getheight() / view.getcurrentbitmap().getheight())); matrix.postrotate(view.getrotation(), view.getx() + view.getwidth()/2f, view.gety()  + view.getheight()/2f); mcanvas.drawbitmap(view.getcurrentbitmap(), matrix, mbasicpaint);

for example, how player-object being drawn according rotation , position:

private void drawplayer(final canvas mcanvas) {     final bitmap playerbitmap = mplayer.getcurrentbitmap();     mplayer.nextframe();     if(playerbitmap != null) {         if(mplayer.getrotation() != 0) {             matrix matrix = new matrix();             matrix.settranslate(-mplayer.getcurrentbitmap().getwidth()/2f, -mplayer.getcurrentbitmap().getheight()/2f);             matrix.postrotate(mplayer.getrotation());             matrix.posttranslate(mplayer.getx() +  + mplayer.getcurrentbitmap().getwidth()/2f, mplayer.gety()  + mplayer.getcurrentbitmap().getheight()/2f);             matrix.postscale((1.0f * mplayer.getwidth() / mplayer.getcurrentbitmap().getwidth()), (1.0f * mplayer.getheight() / mplayer.getcurrentbitmap().getheight()), mplayer.getx(), mplayer.gety());             mcanvas.drawbitmap(mplayer.getcurrentbitmap(), matrix, mbasicpaint);         } else {             matrix matrix = new matrix();             matrix.setscale((1.0f * mplayer.getwidth() / mplayer.getcurrentbitmap().getwidth()), (1.0f * mplayer.getheight() / mplayer.getcurrentbitmap().getheight()));             matrix.posttranslate(mplayer.getx(), mplayer.gety());             mcanvas.drawbitmap(mplayer.getcurrentbitmap(), matrix, mbasicpaint);         }     } else log("bitmap = null!"); }

(this kind of deprecated version, .getcurrentbitmap() calls reduced 1 in current version.)

how improve performance? should create sort of "loading..." screen, in pre-load every bitmap (in biggest size) , pre-rotated version of each bitmap? (this result in, if go 2-4 degree steps, 90-180 versions of each bitmap, seems kind of.. lot?) or this, rotated bitmaps stored well, on memory? don't know opengl etc, why i'm using surfaceview , no other game engine, , i'm sure has work - somehow.

you creating matrix (matrix) , bitmap (playerbitmap) object each time call drawplayer method. far understand, call method each frame. so, each frame, creating 2 large objects need garbage collected when exit method , slow down frame rate. can create 2 objects matrix , playerbitmap class level variables , refresh them on each call of drawplayer, reducing number of gc calls.


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