Error: (27) Resource ID not found for attribute 'srcCompat' in package 'com.example.jaisonjoseph.newsclient'

Question

 I added ImageButtonto mine CardView, and when I add app:srcComapatto mine ImageButton. I get an error as shown below:

Error: (27) Resource ID not found for attribute 'srcCompat' in package 'com.example.jaisonjoseph.newsclient'

here is my content_main.xml layout :

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    app:layout_behavior="@string/appbar_scrolling_view_behavior"
    tools:context="com.example.jaisonjoseph.newsclient.MainActivity"
    tools:showIn="@layout/app_bar_main"
    style="@style/Base.Widget.AppCompat.ButtonBar"
    android:background="#ffffff">

    <android.support.v7.widget.CardView
        android:id="@+id/card_view"
        android:layout_width="350dp"
        android:layout_height="150dp"
        app:cardCornerRadius="6dp"
        android:background="#f6f6f6"
        android:layout_alignParentTop="true"
        android:layout_alignParentRight="true"
        android:layout_alignParentEnd="true">

        <ImageButton
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            app:srcCompat="@drawable/daily"
            android:id="@+id/imageButton3"
            android:src="@drawable/daily" />
    </android.support.v7.widget.CardView>
</RelativeLayout>

Answer 1

Just change the property RelativeLayout

xmlns:app="http://schemas.android.com/apk/res-auto"

to

xmlns:app="http://schemas.android.com/apk/lib/com.example.jaisonjoseph.newsclient"

Edit:

add this

xmlns:app="http://schemas.android.com/apk/lib/com.example.jaisonjoseph.newsclient"

: , '' 'com.app....'

:

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/lib/com.example.jaisonjoseph.newsclient"
        xmlns:tools="http://schemas.android.com/tools"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        app:layout_behavior="@string/appbar_scrolling_view_behavior"
        tools:context="com.example.jaisonjoseph.newsclient.MainActivity"
        tools:showIn="@layout/app_bar_main"
        style="@style/Base.Widget.AppCompat.ButtonBar"
        android:background="#ffffff">

    <android.support.v7.widget.CardView
        android:id="@+id/card_view"
        android:layout_width="350dp"
        android:layout_height="150dp"
        app:cardCornerRadius="6dp"
        android:background="#f6f6f6"
        android:layout_alignParentTop="true"
        android:layout_alignParentRight="true"
        android:layout_alignParentEnd="true">

        <ImageButton
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            app:srcCompat="@drawable/daily"
            android:id="@+id/imageButton3"
            android:src="@drawable/daily" />
    </android.support.v7.widget.CardView>
</RelativeLayout>

Answer 2

, , , lint, .

:

tools: ignore = "MissingPrefix"

RelativeLayout, .

srcCompat AppCompat, AppCompat.

---

UPDATE
, .

, , :

XMLNS: = "http://schemas.android.com/apk/res/com.yourproject.name"

:

xmlns: app = "http://schemas.android.com/apk/res-auto".

https://code.google.com/p/android/issues/detail?id=9656#c71:

" ​​ . URI- .android.com/apk/res-auto > URI, . URI ."

https://code.google.com/p/android/issues/detail?id=9656