Data Binding Android - Type parameter T has incompatible upper bounds : ViewDataBinding and MainActivity

Question

I am using Android Studio 2.0 Preview 4. I'm using Android SDK tools 25 rc1. This error persists no matter how many times I clean / rebuild project. File->Invalidate Caches and restart also doesn't work. I'm not able to run the most basic example of data binding.

build.gradle file

apply plugin: 'com.android.application'  android {     compileSdkVersion 23     buildToolsVersion "23.0.2"      defaultConfig {         applicationId "com.example.chiragshenoy.myapplication"         minSdkVersion 15         targetSdkVersion 23         versionCode 1         versionName "1.0"     }     buildTypes {         release {             minifyEnabled false             proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'         }     }      dataBinding {         enabled = true     } }  dependencies {     compile fileTree(dir: 'libs', include: ['*.jar'])     testCompile 'junit:junit:4.12'     compile 'com.android.support:appcompat-v7:23.1.1'     compile 'com.android.support:design:23.1.1' } 

MainActivity.java

package com.example.chiragshenoy.myapplication;  import android.databinding.DataBindingUtil; import android.os.Bundle; import android.support.v7.app.AppCompatActivity; import android.view.Menu; import android.view.MenuItem;  public class MainActivity extends AppCompatActivity {      @Override     protected void onCreate(Bundle savedInstanceState) {         super.onCreate(savedInstanceState);         MainActivity binding = DataBindingUtil.setContentView(this, R.layout.activity_main);         User user = new User("Test", "User");         binding.setUser(user);     }      @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;     } 

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.chiragshenoy.myapplication.User"/>     </data>     <LinearLayout         android:orientation="vertical"         android:layout_width="match_parent"         android:layout_height="match_parent">         <TextView android:layout_width="wrap_content"             android:layout_height="wrap_content"             android:text="@{user.firstName}"/>         <TextView android:layout_width="wrap_content"             android:layout_height="wrap_content"             android:text="@{user.lastName}"/>     </LinearLayout> </layout> 

this is my top level build.gradle file

// Top-level build file where you can add configuration options common to all sub-projects/modules.  buildscript {     repositories {         jcenter()     }     dependencies {         classpath 'com.android.tools.build:gradle:2.0.0-alpha3'          // NOTE: Do not place your application dependencies here; they belong         // in the individual module build.gradle files     } }  allprojects {     repositories {         jcenter()     } }  task clean(type: Delete) {     delete rootProject.buildDir } 

Answer 1

If your gradle version is ok (1.5+) then you should try this:

1. Go to your "some_layout.xml"
2. Click right -> Refactor -> Rename (or SHIFT + F6)
3. Rename your layout to "some_layout2.xml" for example
4. Rename this file back to the original "some_layout.xml"

This might fix the problem. Let us know.