Using android vector Drawables on pre Lollipop cra

问题:

I'm using vector drawables in android prior to Lollipop and these are of some of my libraries and tool versions:

• Android Studio : 2.0
• Android Gradle Plugin : 2.0.0
• Build Tools : 23.0.2
• Android Support Library : 23.3.0

I added this property in my app level Build.Gradle

android {  
  defaultConfig {  
    vectorDrawables.useSupportLibrary = true  
   }  
}

It is also worth mentioning that I use an extra drawable such as LayerDrawable(layer_list) as stated in Android official Blog (link here) for setting drawables for vector drawables outside of app:srcCompat

<level-list xmlns:android="http://schemas.android.com/apk/res/android">
    <item android:drawable="@drawable/search"/>
</level-list>

You’ll find directly referencing vector drawables outside of app:srcCompat will fail prior to Lollipop. However, AppCompat does support loading vector drawables when they are referenced in another drawable container such as a StateListDrawable, InsetDrawable, LayerDrawable, LevelListDrawable, and RotateDrawable. By using this indirection, you can use vector drawables in cases such as TextView’s android:drawableLeft attribute, which wouldn’t normally be able to support vector drawables.

When I'm using app:srcCompat everything works fine, but when I use:

android:background
android:drawableLeft
android:drawableRight
android:drawableTop
android:drawableBottom

on ImageView, ImageButton, TextView or EditText prior to Lollipop, it throws an expection:

Caused by: android.content.res.Resources$NotFoundException: File res/drawable/search_toggle.xml from drawable resource ID #0x7f0200a9

回答1:

LATEST UPDATE - Jun/2019

Support Library has changed a bit since the original answer. Now, even the Android plugin for Gradle is able to automatically generate the PNG at build time. So, below are two new approaches that should work these days. You can find more info here:

Support Library

Probably, this is the solution that will work for you. If you came here, it means your Android Studio is not generating the PNGs automatically for you.. So, your app is crashing. PNG generation supports only a subset of XML elements. This solution, however, supports all xml tags. So, you have full support to your vector drawable.

You must first, update your build.gradle to support it:

android {
  defaultConfig {
    vectorDrawables.useSupportLibrary = true
  }
}

dependencies {
  compile 'com.android.support:appcompat-v7:23.2.0' // OR HIGHER
}

And then, use app:srcCompat instead of android:src for vector drawables. Don't forget this.

For TextView, if you are using the androidx version of the Support Library, you can use

app:drawableLeftCompat (or right, top, bottom) instead of app:drawableLeft

If you are not using the androidx version of the Support Library and your minSdkVersion is 17 or higher or using a button, you may try to set programmatically via

Drawable icon = AppCompatResources.getDrawable(context, <drawable_id>);
textView.setCompoundDrawablesWithIntrinsicBounds(<leftIcon>,<topIcon>,<rightIcon>,<bottomIcon>);

PNG Generation

Gradle can automatically create the PNG images for you at build time. However, in this approach, not all xml elements are supported. This solution is convenient because you don't need to change anything in your code or in your build.gradle. Just make sure you are using Android Plugin 1.5.0 or higher and Android Studio 2.2 or higher.

I'm using this solution in my app and works fine. No additional build.gradle flag necessary. No hacks is necessary. If you go to /build/generated/res/pngs/... you can see all generated PNGs.

So, if you have some simple icon (since not all xml elements are supported), this solution may work for you. Just update your Android Studio and your Android plugin for Gradle.

---

UPDATE - Jul/2016

They re-enabled that VectorDrawable in
Android Support Library 23.4.0

For AppCompat users, we’ve added an opt-in API to re-enable support Vector Drawables from resources (the behavior found in 23.2) via AppCompatDelegate.setCompatVectorFromResourcesEnabled(true) - keep in mind that this still can cause issues with memory usage and problems updating Configuration instances, hence why it is disabled by default.

Maybe, build.gradle setting is now obsolete and you just need to enable it in proper activities (however, need to test).

Now, to enable it, you must do:

public class MainActivity extends AppCompatActivity {
    static {
        AppCompatDelegate.setCompatVectorFromResourcesEnabled(true);
    }

    ...
}

---

Original Answer - Apr/2016

I think this is happening because Support Vector was disabled in the latest library version: 23.3.0

According to this POST:

For AppCompat users, we’ve decided to remove the functionality which let you use vector drawables from resources on pre-Lollipop devices due to issues found in the implementation in version 23.2.0/23.2.1 (ISSUE 205236). Using app:srcCompat and setImageResource() continues to work.

If you visit issue ISSUE 205236, it seems that they will enable in the future but the memory issue will not be fixed soon:

In the next release I've added an opt-in API where you can re-enable the VectorDrawable support which was removed. It comes with the same caveats as before though (memory usage and problems with Configuration updating).

I had a similar issue. So, in my case, I reverted all icons which use vector drawable from resource to PNG images again (since the memory issue will keep happening even after they provide an option to enable it again).

I'm not sure if this is the best option, but it fixes all the crashes in my opinion.

回答2:

I had the same problem. But doing a lot of R&D I got the answer.

For Imageview and ImageButton use,app:srcCompat="@drawable/...." and for other views like Button, Textview, instead of using "drawableLeft/right..." in the XML, specify drawables programmitically as :

button.setCompoundDrawablesWithIntrinsicBounds(AppCompatResources.getDrawable(mContext,R.drawable.ic_share_brown_18dp), null, null, null);

And use "AppCompatResources" to get the drawable.

回答3:

To elaborate on the other very good answers, here is a diagram that can help you. It is valid if you have Support Library from 23.4.0 to at least 25.1.0.

回答4:

The answer from Guillherme P is pretty awesome. Just to make a small improvement, you don't need to add that line in every activity, if you added it once in the Application class it will work as well.

public class App extends Application {

static {
    AppCompatDelegate.setCompatVectorFromResourcesEnabled(true);
}

REMEMBER: You still need to have enabled the use of the support library in gradle:

android {
  defaultConfig {
    vectorDrawables.useSupportLibrary = true
  }
}

Also, make sure you are using a support library version greater than v23.4, when Google added back the support for Drawable Containers for VectorDrawables (release note)

Update

And for code changes:

1. Make sure to update to app:srcCompat every place that accepts the android:src attribute (the IDE will warn you if it's invalid like for the <bitmap> tag).

2. For drawableLeft, drawableStart, drawableRight, drawableEnd attributes used in TextView and similar views, you will have to set them programmatically for now. An example of setting drawableStart:

   Drawable drawable = AppCompatResources.getDrawable(
           getContext(),
           R.drawable.your_vector_drawable);
   
   if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN_MR1) {
       textView.setCompoundDrawablesRelativeWithIntrinsicBounds(drawable, null, null, null);
   }
   

回答5:

I had the same problem. And fix it by removing

vectorDrawables.useSupportLibrary = true

My target version is 25 and support library is

 compile 'com.android.support:appcompat-v7:25.3.1'

回答6:

VectorDrawables on pre-lollipop should work fine without using

AppCompatDelegate.setCompatVectorFromResourcesEnabled(true);

If you want to use VectorDrawables inside ImageViews, you can use the attribute srcCompat and it will work, but inside Buttons or TextViews it won't, so you need to wrap the Drawable into an InsetDrawable or a LayerDrawable. There is another trick I discovered, if you are using data binding, you could do this:

android:drawableLeft="@{@drawable/vector_ic_access_time_24px}"
android:drawableStart="@{@drawable/vector_ic_access_time_24px}"

That will magically work, I haven't investigated what's happening behind the scenes, but I guess the TextView is using the getDrawable method from the AppCompatResources or similar.

回答7:

Lot of R & d, finally getting this solution for crashes on pre-lollipop devices.

For Imageview

• use app:srcCompat instead of android:src

For TextView/EditText

• Remove drawableleft,drawableright.... and set from drawable java code.

txtview.setCompoundDrawablesWithIntrinsicBounds(AppCompatResources.getDrawable(EventDetailSinglePage.this, R.drawable.ic_done_black_24_n), null, null, null);

For Build.gradle

vectorDrawables.useSupportLibrary = true

回答8:

For anyone who upgrade to android gradle 3.0 and above, there is no need to use AppCompatDelegate.setCompatVectorFromResourcesEnabled(true), or set vectorDrawables.useSupportLibrary = true (add this will cause problem) and use app:srcCompat, it just works.

Take me two days to figure this out, and have not find any related docs in google's docs...

回答9:

I am using VectorDrawables on Pre-lollipop devices and this is how I do it :-

Step 1: Put this in your app level gradle.

android {
  defaultConfig {
    vectorDrawables.useSupportLibrary = true
  }
}

Step 2:

Put this in your Application class and don't forget to register your Application class in the manifest file.

public class App extends Application {
    static {
        AppCompatDelegate.setCompatVectorFromResourcesEnabled(true);
    }
}

Step 3:

Get VectorDrawables using,

imageView.setImageDrawable(ContextCompat.getDrawable(this, R.drawable.my_vector_drawable));

回答10:

After using the below code.

android {
  defaultConfig {
  vectorDrawables.useSupportLibrary = true  
                }
        }




public class App extends Application {
static {
    AppCompatDelegate.setCompatVectorFromResourcesEnabled(true);
}}

still, vector images issue exists for below attributes are

DrawableEnd, DrawableStart, DrawableTop, DrawableBottom, Background

In this case, please follow as below, Instead of referencing vector image directly use selector tag as an intermediate drawable file.

Example:

ic_warranty_icon.xml

<vector xmlns:android="http://schemas.android.com/apk/res/android"
android:width="17dp"
android:height="24dp"
android:autoMirrored="true"
android:viewportWidth="17"
android:viewportHeight="24">

<path
    android:fillColor="#fff"
    android:pathData="M10.927,15.589l-1.549,0.355a7.47,7.47 0,0 1,-0.878 0.056c-4.136,0 -7.5,-3.364 -7.5,-7.5s3.364,-7.5 7.5,-7.5 7.5,3.364 7.5,7.5c0,3.286 -2.126,6.078 -5.073,7.089zM8.5,2a6.508,6.508 0,0 0,-6.5 6.5c0,3.583 2.917,6.5 6.5,6.5s6.5,-2.917 6.5,-6.5 -2.917,-6.5 -6.5,-6.5z" />

safe_ic_warranty_icon.xml

<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
<item android:drawable="@drawable/ic_warranty_icon"  />
</selector>

Your TextView/Layout.

<TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:drawableStart="@drawable/ic_warranty_icon"
       />


<LinearLayout
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:background="@drawable/ic_warranty_icon"
       />

回答11:

Easiest way use :

app:drawableRightCompat ="@drawable/ic_mobilelogin"
app:drawableEndCompat="@drawable/ic_mobilelogin"
app:srcCompat="@drawable/ic_mobile"

and... just use app:**Compatfor compatability. Also add support on build.gradle (module)

android {
   defaultConfig {
       vectorDrawables.useSupportLibrary = true
   }
}

回答12:

Simply overlap vector drawable to state-list then problem will be solved

For example you have back arrow vector image:

ic_back_arrow.xml

yes, you should overlap it to layer list xml (ic_back_arrow_vector_vector.xml):

<?xml version="1.0" encoding="utf-8"?>
<layer-list xmlns:android="http://schemas.android.com/apk/res/android">
    <item android:drawable="@drawable/ic_back_arrow"/>
</layer-list>

Because logic:

vectorDrawables.useSupportLibrary = true

and

AppCompatDelegate.setCompatVectorFromResourcesEnabled(true);

will not help you on the some China devices and older samsung devices. If you do not overlap them, it will fail.

回答13:

We tried 3 things

vectorDrawables.useSupportLibrary = true

Setting setCompatVectorFromResourcesEnabled in Application class

static {
    AppCompatDelegate.setCompatVectorFromResourcesEnabled(true);
}

And use app:srcCompat

But even after that it was failing with

Resources$NotFoundException: File res/drawable/$my_icon__0.xml from color state list resource ID #0x7f080008

then we figured out that our SVG had a Gradient tag. Converting the gradient tag to individual paths for below API <= 23 and using the same SVG API >= 24 worked.

Got help from this answer https://stackoverflow.com/a/47783962/2171513

回答14:

Guilherme P's suggestion was not working for me. I went ahead and made the decision to use png's where I need to do things outside of app:srcCompat i.e. drawableLeft, drawableRight, etc. This was a pretty easy change to make, and doesn't have the potential memory issues AppCompatDelegate.setCompatVectorFromResourcesEnabled(true); introduces.

回答15:

An alternative to Benny's answer is to create an Activity superclass:

public abstract class VectorDrawableActivity extends AppCompatActivity {
  static {
    AppCompatDelegate.setCompatVectorFromResourcesEnabled(true);
  }

  //...
}

Now extend VectorDrawableActivity instead of AppCompatActivity.