我遇到的主要问题是,当我尝试运行以下代码时,我无法动摇错误“dimen无法解决或不是字段”.我已经阅读了一些网站和一些帖子,说它与导入“import com.example.test.R;”有关.然而即使有这样的错误仍然存​​在,如果有人可以帮助它将是惊人的.

Gall.java：

package com.example.test;

import android.app.Activity;
import android.os.Bundle;
import android.support.v4.view.ViewPager;



public class Gall extends Activity {


    @Override
    public void onCreate(Bundle savedInstanceState) {
      super.onCreate(savedInstanceState);
      setContentView(R.layout.activity_gall);

      ViewPager viewPager = (ViewPager) findViewById(R.id.view_pager);
      ImgAdapt adapter = new ImgAdapt(this);
      viewPager.setAdapter(adapter);
    }

  }

activity_gall.xml：

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

    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical" >

    <android.support.v4.view.ViewPager
    android:id="@+id/view_pager"
    android:layout_width="match_parent"
    android:layout_height="match_parent" />

</RelativeLayout>

ImgAdapt.java：

package com.example.test;

import android.content.Context;
import android.support.v4.view.PagerAdapter;
import android.support.v4.view.ViewPager;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ImageView;




public class ImgAdapt extends PagerAdapter {
Context context;

private int[] GalImages = new int[] 
        {
            R.drawable.one,R.drawable.two,R.drawable.three

        };

ImgAdapt(Context context){
this.context=context;
}

public int getCount() {
return GalImages.length;
}


public boolean isViewFromObject(View view,Object object) {
return view == ((ImageView) object);
}


public Object instantiateItem(ViewGroup container,int position) {

ImageView imageView = new ImageView(context);
int padding = context.getResources().getDimensionPixelSize(R.dimen.padding_medium);
imageView.setPadding(padding,padding,padding);
imageView.setScaleType(ImageView.ScaleType.CENTER_INSIDE);
imageView.setImageResource(GalImages[position]);
((ViewPager) container).addView(imageView,0);
return imageView;
}


public void destroyItem(ViewGroup container,int position,Object object) {
((ViewPager) container).removeView((ImageView) object);
}
}

很多代码,对不起,如果这是一个模糊的问题,但行中的’维度’

int padding = context.getResources().getDimensionPixelSize(R.dimen.padding_medium);

是唯一给我一个错误的部分.