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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。:)

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