CODEWITHSUNDEEP
javaandroiddata-bindinggradle
Long Ranger
Long Ranger

Reputation: 6008

Android Data binding : Cannot resolve symbol

I have tried to use the beta features(data binding) in the android studio. After following the guides from the android studio, I can find the related class DataBindingInfo in the android studio. But the databinding class does not generate after I create the project. Can someone help?

build.gradle for the app module

apply plugin: 'com.android.application'

apply plugin: 'com.android.databinding'
android {
    compileSdkVersion 23
    buildToolsVersion "23.0.1"

    defaultConfig {
        applicationId "com.example.pigfamily.myapplication"
        minSdkVersion 15
        targetSdkVersion 23
        versionCode 1
        versionName "1.0"
    }
    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
        }
    }
}

dependencies {
    compile fileTree(dir: 'libs', include: ['*.jar'])
    compile 'com.android.support:appcompat-v7:23.0.1'
}

build.gradle for the project

// Top-level build file where you can add configuration options common to all sub-projects/modules.

buildscript {
    repositories {
        jcenter()
    }
    dependencies {
        dependencies {
            classpath "com.android.tools.build:gradle:1.3.0"
            classpath "com.android.databinding:dataBinder:1.0-rc1"
        }
        // NOTE: Do not place your application dependencies here; they belong
        // in the individual module build.gradle files
    }
}

allprojects {
    repositories {
        jcenter()
    }
}

activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<layout xmlns:android="http://schemas.android.com/apk/res/android">

    <data>

        <variable
            name="user"
            type="com.example.pigfamily.myapplication.User" />
    </data>

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent"
 >

        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="@{user.name}" />

    </LinearLayout>
</layout>

MainActivity.java

package com.example.pigfamily.myapplication;

import android.databinding.DataBindingUtil;
import android.databinding.ViewDataBinding;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;

public class MainActivity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        ActivityMainBinding //cannot resolve the symbol here
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.menu_main, menu);
        return true;
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        // Handle action bar item clicks here. The action bar will
        // automatically handle clicks on the Home/Up button, so long
        // as you specify a parent activity in AndroidManifest.xml.
        int id = item.getItemId();

        //noinspection SimplifiableIfStatement
        if (id == R.id.action_settings) {
            return true;
        }

        return super.onOptionsItemSelected(item);
    }
}

Upvotes: 26

Views: 64096

Answers (15)

Eric
Eric

Reputation: 17536

to implement binding, make sure that:

  1. in the app.gradle, enable dataBinding:

     apply plugin: 'com.android.application'
 ...

 android {
     ...
     buildFeatures {
         dataBinding true
     }
     ...
 }

 dependencies {
     ...
 }

  2. wrap the existing XML layout in a <layout> element:

     <layout
     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">

     <!-- note: xmlns above only needed if used in original XML -->
     <!-- original XML here -->

 </layout>

  3. in Activity/Fragment, use the Binding

     // inflating xml_layout_name.xml...
 val binding = XmlLayoutNameBinding.inflate(LayoutInflater.from(context))

  4. if is unable to resolve the XxxBinding class (even though it can resolve XxxBindingImpl)

    1. first try changing a character in any XML layout that has a <layout> tag
    2. if that doesn't work, restart Android Studio, sync & rebuild project

Upvotes: 10

steve
steve

Reputation: 1179

I came to this question based on the title (cannot resolve symbol). Oddly the description is about a different issue (databinding class does not generate) and I think all the existing answers are about that. Basically, the OP asked two questions.

I'm sure one does need the dataBinding{enabled=true} config to make data binding work, but adding that config does not fix the 'cannot resolve symbol' error. The namespace changed to androidx. Change the import to androidx.databinding.DataBindingUtil

Upvotes: 0

Martynas B
Martynas B

Reputation: 3123

In my case i deleted build, build-cache folders in project scope, then build folder in app module. Afterwards restarted PC and it started working

Upvotes: 0

Sasmita
Sasmita

Reputation: 155

I found a way without restart or invalidate cache. I thing this because binding need to restart or something, so I re-write private ActivityMainBinding binding; and viewBinding work again.

I don't know why this work but this save my time than restart/invalidate cache

Upvotes: 0

Zock77
Zock77

Reputation: 1017

For me I had to add:

buildFeatures {
    viewBinding true
}

to my build.gradle file, then run File->Sync Project With Gradle Files

Upvotes: 2

baobab159
baobab159

Reputation: 61

I've seen this answer nowhere so I suggest: if you added some activity from context menu by clicking on some package like 'data' or 'ui', Android Studio saved path to binding like so: import com.damian.yourappname.ui.databinding.ActivitySearchBinding;

I tested it a few times with my previous projects and it occurs only when sample activity like ScrollingActivity is added to a package other package for all classes. import com.damian.yourappname.databinding.ActivitySearchBinding;

So best way is just creating sample activity in root folder and after gradle sync moving to some package

Upvotes: 0

Mohit Singh
Mohit Singh

Reputation: 1410

Add on build.gradle(:app) viewBinding true

android {
  buildFeatures {
        viewBinding true
    }

}

Upvotes: 3

bensalcie
bensalcie

Reputation: 831

For my case I added :

         dataBinding {
                  enabled=true
         }

Then went to File > Settings > Gradle > Untick offline work> Apply> Ok Then cleaned my project.

Upvotes: 0

Gk Mohammad Emon
Gk Mohammad Emon

Reputation: 6936

If clear Project and Rebuild Project don't work for you try the simple solution. It sometimes doesn't work when you clone a project from remote git branches.You need to just close your project and delete the .gradle and .idea folder of your android project. Then reopen the project.

Upvotes: 1

Sana Ebadi
Sana Ebadi

Reputation: 7220

be sure you add data binding in your build.gradle

and after that sync project after that Restart and clear caches from the file in android studio. this way solve my problem

Upvotes: 0

Leonardo Sibela
Leonardo Sibela

Reputation: 2189

In my case, my layout file had some errors and therefore AS was not creating the binding class. I could find it by expecting the XML file and seeing the error messages.

Upvotes: 0

Rohan Lodhi
Rohan Lodhi

Reputation: 1395

1.Add Below in app gradle

 dataBinding {
        enabled = true
    }

2.In xml layout write below code

<layout
    xmlns:android="http://schemas.android.com/apk/res/android">
  <data></data>
</layout>

UPDATED: CLEAN AND REBUILD THE PROJECT

Upvotes: -1

KishoreKittu467
KishoreKittu467

Reputation: 649

enable dataBinding in your App Level build.gradle file

android {
    ...
    dataBinding{
        enabled=true
    }
}

Upvotes: 51

Ethan Reinsch
Ethan Reinsch

Reputation: 137

Either click sync if a dialogue pops up, hit the sync button next to save, or restart Android Studio.

Upvotes: 1

tenprint
tenprint

Reputation: 1157

I had this same problem. I was digging through gradle settings, cleaning, rebuilding... nothing worked. Finally all I had to do was restart Android Studio

https://www.bignerdranch.com/blog/descent-into-databinding/

As of this writing, this integration needs a little jump-start to get going. To make ListItemCrimeBinding available after adding the tag, you must restart Android Studio, then rebuild the project.

Upvotes: 33

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