数据绑定Android - 类型参数T具有不兼容的上限：ViewDataBinding和MainActivity [英] Data Binding Android - Type parameter T has incompatible upper bounds : ViewDataBinding and MainActivity

问题描述

我正在使用Android Studio 2.0 Preview 4.
我正在使用Android SDK工具25 rc1。无论我清理/重建项目多少次，此错误仍然存​​在。 File-> Invalidate缓存并重新启动也不起作用。
我无法运行最基本的数据绑定示例。

build.gradle文件

 应用插件：'com.android.application'
 
 android {
 compileSdkVersion 23 
 buildToolsVersion23.0.2
 
 defaultConfig {
 applicationIdcom.example.chiragshenoy.myapplication
 minSdkVersion 15 
 targetSdkVersion 23 
 versionCode 1 
 versionName1.0
} 
 buildTypes {
 release {
 minifyEnabled false 
 proguardFiles getDefaultProguardFile（'proguard-android.txt'），'proguard-rules.pro'
} 
} 
 
 dataBinding {
 enabled = true 
} 
} 
 
依赖关系{
 compile fileTree（dir： 'libs'包括：['* .jar']）
 testCompile'junit：junit：4.12'
 compile'c​​om.android.support:appcompat-v7:23.1.1'
编译'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）; 
用户user =新用户（测试，用户）; 
 binding.setUser（user）; 
} 
 
 @Override 
 public boolean onCreateOptionsMenu（菜单菜单）{
 //充满菜单;如果存在，则会将项目添加到操作栏。 
 getMenuInflater（）。inflate（R.menu.menu_main，menu）; 
返回true; 
} 
  

activity_main.xml

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

这是我的顶级build.gradle文件

  //顶级构建文件，您可以在其中添加所有子项目/模块通用的配置选项。 
 
 buildscript {
 repositories {
 jcenter（）
} 
依赖关系{
 classpath'com.android.tools.build:gradle： 2.0.0-alpha3'
 
 //注意：请勿在此处放置应用程序依赖项;它们属于
 //在单个模块中build.gradle文件
} 
} 
 
 allprojects {
 repositories {
 jcenter（）
} 
} 
 
任务清理（类型：删除）{
删除rootProject.buildDir 
} 
  / pre> 
 
解决方案
如果你的毕业生版本是好的（1.5+），那么你应该尝试这样：
 
 
转到你的some_layout.xml
 
 
点击右键 - > Refactor  - >重命名（或SHIFT + F6） li> 
 
将您的布局重命名为some_layout2.xml，例如
 
 
将此文件重命名为原来的some_layout.xml
 
 
这可能会解决问题。让我们知道。
 
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
}

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

Go to your "some_layout.xml"
Click right -> Refactor -> Rename (or SHIFT + F6)
Rename your layout to "some_layout2.xml" for example
Rename this file back to the original "some_layout.xml"
This might fix the problem. Let us know.

                        
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