canvas.drawText-多次vs.一次开销

String text = \"ABCDEFGHIJKLMNOPQRSTUVWXYZ\";
String t[] = {\"A\",\"B\",\"C\",\"D\",\"E\",\"F\",\"G\",\"H\",\"I\",\"J\",
              \"K\",\"L\",\"M\",\"N\",\"O\",\"P\",\"Q\",\"R\",\"S\",\"T\",
              \"U\",\"V\",\"W\",\"X\",\"Y\",\"Z\"};
long fulltime=0;
double fullavetime=0;
long fullcount=0;   
long chartime=0;
double charavetime=0;
long charcount=0;
@Override
protected void onDraw(Canvas canvas) {
    float width = (float) getWidth();
    float inc=width/26;
    float y1 = (float) getHeight() / 3;
    float y2 = y1*2;;
    float x=0;

        // do this test loop 1000 times to get time data
    if (fullcount < 1000) {

        // test by char using a simple 26 char string
        // I tried to eliminate as much overhead as possible
        // so this just pulls strings from an array and draws them
    long start=System.currentTimeMillis();

    for (int i=0;i<26;i++) {
        canvas.drawText(t[i], x, y1, textPaint);
        x+=inc;
    }

    long end=System.currentTimeMillis();
    long elapse=end-start;
    chartime+=elapse;
    charcount++;
    charavetime=(double)chartime/charcount;

        // draw the entire 26 char string at once
    x=0f;
    start=System.currentTimeMillis();

    canvas.drawText(text, x, y2, textPaint);

    end=System.currentTimeMillis();
    elapse=end-start;
    fulltime+=elapse;
    fullcount++;
    fullavetime=(double)fulltime/fullcount;
    } else {
           // after the 1000 test draws, just paint the results on screen
        canvas.drawText(\"bychar \"+charavetime, 0, y1, textPaint);
        canvas.drawText(\"  full \"+fullavetime, 0, y2, textPaint);
    }
        // keep painting over and over
    invalidate();
}

HTC EVO 4G (2.2)
bychar 1.055  1.142  1.184
full    .398   .354   .432

Motorola Droid (2.1 up 1)
bychar .951  1.108  1.071
full   .138   .146   .134

Nexus One (2.3.3)
bychar .991 1.033 1.045 .938
full   .839  .886  .891 .819