Develop Reference

Android WebView and network-security-configuration

I'm developing on Android 8 (26 API, Oreo) and I use android.webkit.WebView in my app.
I would implement "secure network connection" when I load pages with my WebView (in other words I would avoid man-in-the-middle problems and self-signed certificates)
To do this I used network security configuration (on Android from version 7.0 N, 24 API)
So:
In res>xml>network_security_config.xml
<?xml version="1.0" encoding="utf-8"?>
<network-security-config>
<domain-config>
<domain includeSubdomains="true">MY_DOMAIN.com</domain>
<pin-set>
<pin digest="SHA-256">MY_PIN</pin>
</pin-set>
</domain-config>
</network-security-config>
I found MY_PIN inserting MY_DOMAIN.com here: https://report-uri.com/home/pkp_hash
In manifest>AndoridManifest.xml
...
<application
android:networkSecurityConfig="#xml/network_security_config"
...
</application>
In the onCreate of my app I simply do:
WebView webView = new WebView(this);
webView.setWebViewClient(new WebViewClient() {
#Override
public void onReceivedSslError(..)..
#Override
public void onPageFinished()..
...});
webView.loadUrl(MY_DOMAIN.com);
According to Android docs I'm doing it right but I have a problem: it's like network_security_config.xml is never checked because I can set every "random" and "wrong" value for the pin and it works normally (URL MY_DOMAIN.com is loaded normally without blocking behavior).
So that means that if some man-in-the-middle return back one different pin of those I've written in res>xml>network_security_config.xml the application continue running well and with no secure behavior.
It also does not execute one of the overridden error method of WebViewClient.
Please help I can not understand my error.

[SOLVED]
In AndoridManifest.xml I declared
<application
android:networkSecurityConfig="#xml/network_security_config"
...
</application>
Editor warned about a problem related to the SDK version but I didn't see it.
This is the warning.
[SOLUTION]
Add this tools:targetApi="n" to the Manifest like the following:
<application
android:networkSecurityConfig="#xml/network_security_config"
...
tools:targetApi="n">
[EDIT]
SSL error is handled in public void onReceivedSslError(...) of WebViewClient (See the following code)
webView.setWebViewClient(new WebViewClient() {
public void onReceivedSslError(WebView view,
final SslErrorHandler handler, SslError error) {
//HANDLE HERE THE ERROR!!!
...
}
...
});

Android DataBinding - Why Data Binding not support #mipmap images

Using DataBinding, I trying to access icon from mipmap folder, after write a code it not compile model class and it show error in log - "token recognition error". Look at the below screenshot even it not allowed #mipmap. If anyone know the reason Please let me know
<ImageView
android:id="#+id/img_page1"
android:layout_width="#dimen/splash_slider_circle"
android:layout_height="#dimen/splash_slider_circle"
android:src="#{slider.img1 ? #mipmap/ic_circle_filled : #mipmap/ic_circle_outline}" />

The exact reason for the described behaviour is unknown to me. But if it's inconvenient to move all your icons from mipmap to drawable folders, it's possible to import your generated R class in the layout and refer mipmaps in conditions starting with R.mipmap and using app:imageResource attribute:
<data>
<import type="your.package.R" />
...
</data>
<ImageView
...
app:imageResource="#{someConditionVariable ? R.mipmap.ic_for_true_condition : R.mipmap.ic_for_false_condition}"
... />

Is there a way to add a TAG to a NetworkImageView with Volley

It is very easy to add a TAG to a request with Volley, but when it comes to a NetworkImageView, I don't see a way to specify a TAG to the request that is handled and added to the queue by the ImageLoader.
A request TAG would help me to easily identify the request and react consequently.
Therefore, how can I add a TAG to a request made by a NetworkImageView ?

There is currently no way unless you override ImageLoader and NetworkImageView.
The 'guy' who is creating the request is
ImageLoader.makeImageRequest
so you need to pass the tag to it.
However you can use jus which is based on volley and support this feature.
you currently need to use the SNAPSHOT version:
compile 'io.apptik.comm:jus-android:0.7.0-SNAPSHOT'
and you can set the tag using the "requestTag" argument in the xml layout:
<ScrollView xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".fragments.JusFragment">
....
<io.apptik.comm.jus.ui.NetworkImageView
android:id="#+id/networkImageView"
android:layout_width="150dp"
android:layout_height="170dp"
app:requestTag="ImageTag1"
/>
....
OR
from the code before you call setImageUrl():
networkImageView.setRequestTag("ImageTag2");
networkImageView.setImageUrl(url, imageLoader);

Support library VectorDrawable Resources$NotFoundException

I am using Design Support Library version 23.4.0. I have enabled the gradle flag:
defaultConfig {
vectorDrawables.useSupportLibrary = true
}
I am using build tools version 23.0.2, but still, I am getting Resources$NotFoundException on KitKat or lower.
It is occurring when I use android:drawableLeft or imageView.setImageResource(R.drawable.drawable_image).
And yes, I am putting this on every activity where I am using drawables
static {
AppCompatDelegate.setCompatVectorFromResourcesEnabled(true);
}
Is this a bug of the support library?

It took 3 separate things for me to get this to work using support library 23.4.0:
Add this to build.gradle
defaultConfig {
vectorDrawables.useSupportLibrary = true
}
Add the following to onCreate of your Application class
AppCompatDelegate.setCompatVectorFromResourcesEnabled(true);
(From the reference of this link - "https://stackoverflow.com/a/45582033/10752962")
In API less then 21,use this line before setContentView();
For all XML views in which you are setting a vector drawable replace
android:src
with
app:srcCompat
and in the code replace this:
imageView.setImageResource(...);
with
imageView.setImageDrawable(...);

To complement some of the answers here: backward-compatible support for VectorDrawables comes with a price and doesn't work in all cases.
In which cases does it work? I've made this diagram to help (valid for Support Library 23.4.0 to at least 25.1.0).

Try using:
imageView.setImageDrawable(VectorDrawableCompat.create(getResources(), drawableRes, null));
You don't have to add AppCompatDelegate.setCompatVectorFromResourcesEnabled(true);
this way.
Just inflate your vector drawables using VectorDrawableCompat and you're all set.

We had the same issue. Vector drawables were not visible on Kitkat. I solved this issue by adding AppCompatDelegate.setCompatVectorFromResourcesEnabled(true); to the onCreate method of Activities.
Before that dont forget to add:
defaultConfig {
vectorDrawables.useSupportLibrary = true
}
and call setImageResource for the view that you use the vector drawable. My view is ImageButton. I have Android SDK build tools version 23.0.3

Sorry for being late to the party but this answer may help users who want to enable the flag AppCompatDelegate.setCompatVectorFromResourcesEnabled(true); for all activities.
1. Create a class which extends to Application (android.app.Application)
public class MyApplicationClass extends Application
{
#Override
public void onCreate()
{
super.onCreate();
}
}
2. Head over to Manifest.xml and add the following line to your tag
<application
android:name=".MyApplicationClass"
android:allowBackup="true"
android:icon="#mipmap/ic_launcher"
android:label="#string/app_name"
android:roundIcon="#mipmap/ic_launcher_round"
android:supportsRtl="true"
android:theme="#style/AppTheme">
...
</application>
3. Add the following code above onCreate in MyApplicationClass.java
// This flag should be set to true to enable VectorDrawable support for API < 21
static
{
AppCompatDelegate.setCompatVectorFromResourcesEnabled(true);
}
Complete code for MyApplicationClass.java
import android.app.Application;
import android.support.v7.app.AppCompatDelegate;
/**
* Created by Gaurav Lonkar on 23-Dec-17.
*/
public class MyApplicationClass extends Application
{
// This flag should be set to true to enable VectorDrawable support for API < 21
static
{
AppCompatDelegate.setCompatVectorFromResourcesEnabled(true);
}
#Override
public void onCreate()
{
super.onCreate();
}
}

defaultConfig {
vectorDrawables.useSupportLibrary = true
}
use this in app.gradle
Then use AppCompatDrawableManager to setDrawable and getDrawable. Works for me

Support for vector drawables in places like android:drawableLeft was disabled in support library 23.3. It was announced on Google+:
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. Using app:srcCompat and setImageResource()
continues to work.
Links to issues:
https://code.google.com/p/android/issues/detail?id=205236
https://code.google.com/p/android/issues/detail?id=204708
However, if you can live with those issues, in 23.4 you can re-enable this functionality using AppCompatDelegate.setCompatVectorFromResourcesEnabled().
If you're curious how this works, the best person to learn from is Chris Banes, who authored this functionality. He explains in detail on his blog.

change
imageView.setImageResource(R.drawable.drawable_image)
to
imageView.setImageDrawable(ContextCompat.getDrawable(getContext(), R.drawable.drawable_image));
if you want to use vectordrawable in xml, use this:
app:srcCompat="#drawable/drawable_image"

I had a similar problem long ago, it did not work by setting
vectorDrawables.useSupportLibrary = true
only worked when I created the "mipmap" folder, and the code used
imageView.setImageResource (R.mipmap.drawable_image)
It has more Info here

Inflating Drawable's
`VectorDrawable` and `AnimatedVectorDrawable` in this support library can be inflated in this way:
Calling static getDrawable() methods:
//This will only inflate a drawable with <vector> as the root element
VectorDrawable.getDrawable(context, R.drawable.ic_arrow_vector);
//This will only inflate a drawable with <animated-vector> as the root element
AnimatedVectorDrawable.getDrawable(context, R.drawable.ic_arrow_to_menu_animated_vector);
// This will inflate any drawable and will auto-fallback to the lollipop implementation on api 21+ devices
ResourcesCompat.getDrawable(context, R.drawable.any_drawable);
If inflating the Drawable in java code, it is recommended to always use ResourcesCompat.getDrawable() as this handles Lollipop fallback when applicable. This allows the system to cache Drawable ConstantState and hence is more efficient.
The library has the following morph (bi-directional) animations :
Play-Pause morph animation
Play-Stop morph animation
Arrow-Hamburger menu morph animation
As you can see, I produced the above image on my API 16 phone:
import com.wnafee.vector.compat.AnimatedVectorDrawable;
mdrawable = (AnimatedVectorDrawable) AnimatedVectorDrawable.getDrawable(this.getApplicationContext(), R.drawable.consolidated_animated_vector);
Look at the github README for vector-compat here: https://github.com/wnafee/vector-compat
This will fix your problem (down to API 14) if you merge it with your app module's build.gradle dependencies (usually at the end of file):
dependencies {
compile fileTree(dir: 'libs', include: ['*.jar'])
//Trying to FIX Binary XML file line #2: invalid drawable tag animated-vector
compile 'com.android.support:appcompat-v7:25.0.0'
compile 'com.android.support:design:25.0.0'
//not needed
// compile 'com.android.support:support-vector-drawable:25.0.0'
compile 'com.wnafee:vector-compat:1.0.5'//*******holy grail *******https://github.com/wnafee/vector-compat
// Failed to resolve: com.android.support:support-animated-vector-drawable:25.0.0
//not needed
// compile 'com.android.support:support-animated-vector-drawable:25.0.0'
}

Do not put your vectors in drawable-anydpi
, old devices does not support that
put them in drawable

In my particular case, I had this problem because I was using a drawable selector as the image resource with several vectors in the selector, as in:
<selector xmlns:android="http://schemas.android.com/apk/res/android">
<item android:state_selected="true" android:drawable="#drawable/vector_select_blue"/>
<item android:state_pressed="true" android:drawable="#drawable/vector_select_black"/>
.
.
etc
</selector>
Yes, pretty bad, but didn't know better at the time.
So, the right way of doing this is using the tint property in your vector file, as in:
<vector ..vector properties..
android:tint="#color/vector_color_selector">
<path ..path properties../>
</vector>
(You can also use the app:tint attribute in the AppCompatImageView)
And now, your vector_color_selector file should have the colors you want, as in:
<selector xmlns:android="http://schemas.android.com/apk/res/android">
<item android:state_selected="true" android:color="#color/blue"/>
<item android:state_pressed="true" android:color="#color/black"/>
.
.
etc
</selector>
I hope this helps someone if previous answers didn't work for you. Stating the obvious, but I must say that you still need to set vectorDrawables.useSupportLibrary = true in gradle, use AppCompatImageView and use app:srcCompat or setImageDrawable + AppCompatResources.getDrawable to avoid any troubles with the vector compat library.

Use AppCompatImageView instead of ImageView as said by Harish Gyanani in comments , it works fine with this for me.
Official docs

I had the same problem and actually what was missing is I was using app:srcCompat on AppCompatTextView except of AppCompatImageView.
The way I have found the problematic part:
My error looks like:
Fatal Exception: android.content.res.Resources$NotFoundException
Resource ID #0x7f0700d1
Here are the steps I followed the resource id of the mentioned drawable :
APK Analyzer -> classesXXX.dex
In this dex file I opened the directory of my apps package name and went to R$drawable file
R$drawable -> Show as byte code.
Search for ID [0x7f0700d1] (check your own ID)
Find the image and check for all the usages (CMD + F7) of the resource
Fix
Hope it will help somebody.

Picasso Main Errored

I am trying to use Picasso Android library but i'm not able to get it working.
For starting, i am trying the simplest of the things:
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_basic_view);
mImageView = (ImageView) findViewById(R.id.imageView);
Picasso.with(this).setIndicatorsEnabled(true);
Picasso.with(this).setLoggingEnabled(true);
Picasso.with(this).load("http://i.imgur.com/DvpvklR.png").into(mImageView);
}
the activity layout is:
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent" >
<ImageView
android:id="#+id/imageView"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:background="#FF0000"/>
</RelativeLayout>
The view remains completely red.
If i set a resource in the view via setImageResource, it correctly displays.
The only relevant clue that something went wrong is a message saying:
Picasso: main errored
but i can't understand why.
I would happily paste more logcat output but it breaks the code block and becomes unreadable.
Here's a pastebin: main errored log
I believe there's something trivial i am doing wrong.

To download images from the internet, you will need the INTERNET permission in your manifest.
<uses-permission android:name="android.permission.INTERNET" />