问题
I have a need to show svg files in my android app. svg-android seems like the only library that has any documentation and thus my first approach. The only example available demonstrates how to create an imageview attach an svg image and attach it to the main content view. I however want a svg file to show up on a RelativeLayout I already have defined. I attempted an implementation like so:
ImageView imageView = new ImageView(this);
SVG svg = SVGParser.getSVGFromResource(getResources(), R.raw.logo);
imageView.setImageDrawable(svg.createPictureDrawable());
RelativeLayout home_header = (RelativeLayout) findViewById(R.id.home_header);
home_header.addView(imageView);
All appears well (no warnings/errors) but when I test the app log cat reports:
05-27 11:25:43.940: I/Adreno200-EGLSUB(28492): <ConfigWindowMatch:2078>: Format RGBA_8888.
05-27 11:25:43.950: E/(28492): Can't open file for reading
05-27 11:25:43.960: E/(28492): Can't open file for reading
I have verified the following: - File is not open in any other program - File is properly formatted
What am I missing here? Any suggestions on what might be going on?
回答1:
android:hardwareAccelerated="false" will disable hardware rendering for the whole activity. An alternative might be to just use:
imageView.setLayerType(View.LAYER_TYPE_SOFTWARE, null);
Which should disable it only for that View.
PS. If you are looking for an SVG library with better documentation (and more features), try mine: http://code.google.com/p/androidsvg/
回答2:
After some debugging and comparing the emulator to the native app I discovered that the "can't open file for reading" is not related to the svg files not displaying. Instead it was related to hardware acceleration. I had to set the following in my manifest
android:hardwareAccelerated="false"
problem solved. Time wasted. Brain blown.
回答3:
There is another option now that doesn't require android:hardwareAccelerated="false"
Use this library - https://github.com/wnafee/vector-compat (api 14+)
android {
// use version 22 or higher
buildToolsVersion "22.0.1"
...
}
dependencies {
compile 'com.wnafee:vector-compat:1.0.5'
...
}
And create a custom ImageView class that uses vector compat class -
public class SvgImageView extends ImageView {
private Drawable icon;
public SvgImageView(Context context, AttributeSet attrs) {
super(context, attrs);
TypedArray ta = context.obtainStyledAttributes(attrs,
R.styleable.button_left, 0, 0);
try {
int resId = ta.getResourceId(R.styleable.button_left_b_icon, -1);
if (resId != -1) {
icon = ResourcesCompat.getDrawable(this.getContext(), resId);
}
} finally {
ta.recycle();
}
if (icon != null) {
setImage(icon);
}
}
public void setImage(Drawable icon) {
SvgImageView.this.setImageDrawable(icon);
}
}
Vector image example -
<?xml version="1.0" encoding="utf-8"?>
<vector xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:width="@dimen/logo_dimen"
android:height="@dimen/logo_dimen"
android:viewportWidth="@integer/view_port_dimen_logo"
android:viewportHeight="@integer/view_port_dimen_logo"
app:vc_viewportWidth="@integer/view_port_dimen_logo"
app:vc_viewportHeight="@integer/view_port_dimen_logo">
<group
android:name="rotationGroup"
android:pivotX="0"
android:pivotY="0"
android:rotation="0">
<path
android:name="v"
android:fillColor="@color/white"
android:pathData="m15.5,15.6c0,-1.5 2.8,-1.9 2.8,-5c0,-1.5 -0.7,-2.6 -1.8,-3.5h1.6l1.7,-1.1h-5c-1.7,0 -3.5,0.4 -4.8,1.6c-1,0.8 -1.6,2.1 -1.6,3.4c0,2.4 1.9,4.1 4.2,4.1c0.3,0 0.5,0 0.8,0c-0.1,0.3 -0.3,0.6 -0.3,1c0,0.7 0.3,1.2 0.8,1.8c-1.6,0.1 -3.4,0.3 -4.9,1.2c-1.1,0.7 -2,1.8 -2,3.2c0,0.6 0.2,1.1 0.4,1.6c1,1.7 3.2,2.2 5,2.2c2.3,0 4.9,-0.7 6.1,-2.8c0.4,-0.6 0.6,-1.3 0.6,-2.1c0.2,-3.5 -3.6,-4 -3.6,-5.6zm-1.7,-1.2c-2.2,0 -3.2,-2.8 -3.2,-4.6c0,-0.7 0.1,-1.4 0.6,-1.9c0.4,-0.6 1.1,-0.9 1.7,-0.9c2.2,0 3.2,3 3.2,4.8c0,0.7 -0.1,1.4 -0.6,1.9c-0.4,0.4 -1.1,0.7 -1.7,0.7zm0,10.5c-1.9,0 -4.5,-0.8 -4.5,-3.2c0,-2.5 2.9,-3.1 4.9,-3.1c0.2,0 0.4,0 0.6,0c1.2,0.8 2.8,1.8 2.8,3.4c-0.1,2.2 -2,2.9 -3.8,2.9zm9.7,-10.5v-2.6h-1.3v2.6h-2.5v1.3h2.5v2.6h1.3v-2.6h2.6v-1.3h-2.6l0,0z"
app:vc_fillColor="@color/white"
app:vc_pathData="m15.5,15.6c0,-1.5 2.8,-1.9 2.8,-5c0,-1.5 -0.7,-2.6 -1.8,-3.5h1.6l1.7,-1.1h-5c-1.7,0 -3.5,0.4 -4.8,1.6c-1,0.8 -1.6,2.1 -1.6,3.4c0,2.4 1.9,4.1 4.2,4.1c0.3,0 0.5,0 0.8,0c-0.1,0.3 -0.3,0.6 -0.3,1c0,0.7 0.3,1.2 0.8,1.8c-1.6,0.1 -3.4,0.3 -4.9,1.2c-1.1,0.7 -2,1.8 -2,3.2c0,0.6 0.2,1.1 0.4,1.6c1,1.7 3.2,2.2 5,2.2c2.3,0 4.9,-0.7 6.1,-2.8c0.4,-0.6 0.6,-1.3 0.6,-2.1c0.2,-3.5 -3.6,-4 -3.6,-5.6zm-1.7,-1.2c-2.2,0 -3.2,-2.8 -3.2,-4.6c0,-0.7 0.1,-1.4 0.6,-1.9c0.4,-0.6 1.1,-0.9 1.7,-0.9c2.2,0 3.2,3 3.2,4.8c0,0.7 -0.1,1.4 -0.6,1.9c-0.4,0.4 -1.1,0.7 -1.7,0.7zm0,10.5c-1.9,0 -4.5,-0.8 -4.5,-3.2c0,-2.5 2.9,-3.1 4.9,-3.1c0.2,0 0.4,0 0.6,0c1.2,0.8 2.8,1.8 2.8,3.4c-0.1,2.2 -2,2.9 -3.8,2.9zm9.7,-10.5v-2.6h-1.3v2.6h-2.5v1.3h2.5v2.6h1.3v-2.6h2.6v-1.3h-2.6l0,0z" />
</group>
</vector>
Example -
<packagename.SvgImageView
app:b_icon="@drawable/google_logo"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/imageView3" />
回答4:
AppCompatImageView
from package
android.support.v7.widget
Check this post, I have given all the details to use svg. As per my experience, you can use svg in Android flawlessly.Pros:
- No third party library (official android support library needed)
- No changes in gradle file
- Use `android:src` for all `ImageViews` instead of 'app:srcCompat` for svg and `android:src` for other images.
- No need to use AppCompatDelegate.setCompatVectorFromResourcesEnabled(true); in static block of BaseActivity.
来源：https://stackoverflow.com/questions/16778960/svg-android-imageview-not-working