扫一扫加加了扫描动画，结果很卡

 ImageView mQrLineView = (ImageView) findViewById(R.id.capture_scan_line);
        ScaleAnimation animation = new ScaleAnimation(1.0f, 1.0f, 0.0f, 1.0f);
        animation.setRepeatCount(-1);
        animation.setRepeatMode(Animation.RESTART);
        animation.setInterpolator(new LinearInterpolator());
        animation.setDuration(1000);
        mQrLineView.startAnimation(animation);

        <RelativeLayout
            android:id="@+id/capture_crop_view"
            android:layout_width="340dp"
            android:layout_height="340dp"
            android:layout_below="@id/capture_mask_top"
            android:layout_centerHorizontal="true"
            android:background="@drawable/bg_scan">

            <ImageView
                android:id="@+id/capture_scan_line"
                android:layout_width="match_parent"
                android:layout_height="match_parent"
                android:layout_alignParentTop="true"
                android:layout_margin="5dp"
                android:src="@drawable/kakalib_scan_ray" />
        </RelativeLayout>