我必须实现一个“扫描栏”动画,制作翻译动画(有点像谷歌护目镜应用程序)。这是一张条形图(自定义视图),它从左到右穿过我的表面视图。
我做了一些接近我期望的事情,除了动画滞后:(
这是我的 XML 的一部分:
<LinearLayout
android:id="@+id/layoutCamera"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_weight="8" >
<SurfaceView
android:id="@+id/surfaceView"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:layout_gravity="top" />
</LinearLayout>
这是我的自定义视图:
class ScannerView extends View
{
private Bitmap scanBar;
private int sizeBarW;
private int sizeBarH;
public ScannerView(Context context, int heightParent)
{
super(context);
//init size
sizeBarW = 5;
//I adjust the height of the bar to my surfaceview
sizeBarH = heightParent;
//prepare bitmap
scanBar = prepareBitmap(getResources().getDrawable(R.drawable.scan_bar), sizeBarW,
sizeBarH);
}
private static Bitmap prepareBitmap(Drawable drawable, int width, int height)
{
Bitmap bitmap = Bitmap.createBitmap(width, height, Bitmap.Config.ARGB_8888);
drawable.setBounds(0, 0, width, height);
Canvas canvas = new Canvas(bitmap);
drawable.draw(canvas);
return bitmap;
}
@Override
protected void onDraw(Canvas canvas)
{
canvas.drawBitmap(scanBar, 0, 0, null);
}
}
这是我的动画功能(在我的活动类中调用 surfaceChanged()):
private void LaunchAnimation()
{
// 1 - view
mScanBar = new ScannerView(this, surfaceView.getHeight());
addContentView(mScanBar, new LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT));
// 2 - Animation
Animation animTranslation = new TranslateAnimation(Animation.RELATIVE_TO_PARENT, -1.0f, Animation.RELATIVE_TO_PARENT, 1.0f,
Animation.RELATIVE_TO_PARENT, 0.0f, Animation.RELATIVE_TO_PARENT, 0.0f);
animTranslation.setDuration(5000);
animTranslation.setRepeatCount(Animation.INFINITE);
mScanBar.startAnimation(animTranslation);
}
我是 android 编程的初学者,我不确定我是否能以最好的方式做到这一点...... :?
感谢您帮助我解决这个滞后/减速问题。:)