示例Android数据绑定错误

Question

我想在我的一个Android项目中实现数据绑定。我无法在网络中找到一个完整的工作示例，因此按照以下步骤开始：http://developer.android.com/tools/data-binding/guide.html。

都在我的文件中的代码如下：

的build.gradle（项目）

// 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:1.5.0' 

     // NOTE: Do not place your application dependencies here; they belong 
     // in the individual module build.gradle files 
    } 
} 

allprojects { 
    repositories { 
     jcenter() 
    } 
} 

的build.gradle（模块）

apply plugin: 'com.android.application' 

android { 
    compileSdkVersion 23 
    buildToolsVersion "23.0.2" 

    defaultConfig { 
     applicationId "org.my.anddatabind" 
     minSdkVersion 18 
     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']) 
    compile 'com.android.support:appcompat-v7:23.1.1' 
} 

MainActivity.java

package org.my.anddatabind; 

import android.app.Activity; 
import android.databinding.DataBindingUtil; 
import android.os.Bundle; 
import android.view.Menu; 
import android.view.MenuItem; 

import org.my.anddatabind.databinding.MainActivityBinding; 

public class MainActivity extends Activity { 

    @Override 
    protected void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.main_activity); 

     MainActivityBinding binding = DataBindingUtil.setContentView(this, R.layout.main_activity); 
     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; 
    } 

    @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); 
    } 
} 

main_acti vity.xml

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

User.java

package org.my.anddatabind; 

public class User { 
    public final String firstName; 
    public final String lastName; 
    public User(String firstName, String lastName) { 
     this.firstName = firstName; 
     this.lastName = lastName; 
    } 
} 

当我生成项目，我得到的错误：

**** /数据绑定错误****信息：无法解析用户文件的类型：C：\ Users \ xxx \ AndroidStudioProjects \ AndDataBind \ app \ src \ main \ res \ layout \ main_activity.xml loc：11：24 - 11:27 **** \ data绑定错误* ***

MainActivity.java中的setUser（user）也显示n错误：''中的setUser（'org.my.anddatabind.User'）不能应用于'（org.my.anddatabind.User）'

Answer 1

请检查您的类包名称。 看来你的“用户”类包的名字是

org.my.anddatabind.User 

但在XML中已定义的类型为

<data> 
    <variable name="user" type="`com.my.anddatabind.User`"/> 
</data> 

即

com.my.anddatabind.User