Why won't my SVG image display on my Galaxy Nexus?

问题

I'm trying to have one image be a background for another, using the svg-android library. When I view the image on my Samsung Galaxy Nexus (4.3, Sprint), the background image doesn't display. When I view it on the emulator, it's there correctly. I've even removed the foreground, and this stays the same. Here's the key parts of the XML layout:

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    xmlns:ads="http://schemas.android.com/apk/lib/com.google.ads"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity" >

    <com.kd7uiy.hamfinder.SvgView
        android:id="@+id/svgImage"
        android:src="@raw/paper"
        android:layout_alignLeft="@+id/scroll"
        android:layout_alignRight="@id/scroll"
        android:layout_alignTop="@id/scroll"
        android:layout_above="@+id/buttons"
        android:layout_width="match_parent"
        android:layout_height="match_parent" />

    <ScrollView
            android:id="@+id/scroll"
            android:scrollbars="none"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_above="@+id/buttons"
            android:layout_alignParentLeft="true"
            android:layout_alignParentRight="true"
            android:background="@android:color/transparent"
            android:layout_below="@id/adView">
        <TableLayout
            android:id="@+id/tableView"
                android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:shrinkColumns="1"
            android:stretchColumns="1"
        />
    </ScrollView>
</RelativeLayout>

And the custom class. Note I tried a tip from svg-android without luck:

public class SvgView extends View {

    Picture picture;

    long startTime;
    float scaleFactor;

    public SvgView(Context context,AttributeSet attrs) {
        super(context,attrs);
        setImage(attrs.getAttributeResourceValue("http://schemas.android.com/apk/res/android","src", 0));
        if (Build.VERSION.SDK_INT < Build.VERSION_CODES.HONEYCOMB)
        {
            disableHardwareAcceleration();
        }
    }

    @TargetApi(Build.VERSION_CODES.HONEYCOMB)
    private void disableHardwareAcceleration()
    {
        setLayerType(View.LAYER_TYPE_SOFTWARE, null);
    }

    public SvgView(Context context) {
        super(context);

    }

    public void setImage(int img_resource)
    {
        // Parse the SVG file from the resource
        SVG svg = SVGParser.getSVGFromResource(getResources(),img_resource);
        picture = svg.getPicture();
    }

    public void onDraw(Canvas canvas) {
        if (picture!=null)
        {
            scaleFactor=Math.min((float)getHeight()/picture.getHeight(),(float)getWidth()/picture.getWidth());
            canvas.scale((float)scaleFactor,(float)scaleFactor);
            canvas.drawPicture(picture);
        }

    }
}

Lastly, here's the image from my Galaxy Nexus, and the emulator. Note the difference in the background.

回答1:

It turns out the provided tip was in the right direction, but I had a small typo. The hardware acceleration seems to be the culprit. As I don't have anything that complex, disabling it is just fine. I almost had the right solution, just had the wrong comparitor. Changing the code as follows fixes it:

public SvgView(Context context,AttributeSet attrs) {
    super(context,attrs);
    setImage(attrs.getAttributeResourceValue("http://schemas.android.com/apk/res/android","src", 0));
    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.HONEYCOMB)
    {
        disableHardwareAcceleration();
    }
}

来源：https://stackoverflow.com/questions/20365522/why-wont-my-svg-image-display-on-my-galaxy-nexus

标签

android

svg-android