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Commit 6b0c318d authored by Tim Murray's avatar Tim Murray
Browse files

TouchLatency: don't recreate DecimalFormat on every frame 

reduces UI thread time by 20%

Test: manual
Change-Id: If9053d19fc0db1491a0b9402c54243aff8f12432
parent 0ed11d02

tests/TouchLatency/app/src/main/java/com/prefabulated/touchlatency/TouchLatencyActivity.java

+6 −3
Original line number Diff line number Diff line
@@ -73,6 +73,10 @@ class TouchLatencyView extends View implements View.OnTouchListener { 
        mFps = 0;

        mLastFpsUpdate = 0;

        mFrameCount = 0;



        mDf = new DecimalFormat("fps: #.##");

        mDf.setRoundingMode(RoundingMode.HALF_UP);



        Trace.endSection();

    }
@@ -181,9 +185,7 @@ class TouchLatencyView extends View implements View.OnTouchListener { 
        // Draw the ball

        canvas.drawColor(BACKGROUND_COLOR);

        canvas.drawOval(left, top, right, bottom, getBallColor());

        DecimalFormat df = new DecimalFormat("fps: #.##");

        df.setRoundingMode(RoundingMode.HALF_UP);

        canvas.drawText(df.format(mFps), width, 100, mTextPaint);

        canvas.drawText(mDf.format(mFps), width, 100, mTextPaint);



        invalidate();

        Trace.endSection();
@@ -220,6 +222,7 @@ class TouchLatencyView extends View implements View.OnTouchListener { 


    private long mLastDrawNano, mLastFpsUpdate, mFrameCount;

    private float mFps;

    private DecimalFormat mDf;

}



public class TouchLatencyActivity extends Activity {