我是不是漏掉了什么？

我完全按照此页面(以及其他一些教程)上的说明进行操作，但它们似乎总是缺少一些关键信息，因为它们不是开箱即用的。

我添加了一堆似乎丢失的包，但现在我卡住了。

http://developer.android.com/resources/tutorials/views/hello-gridview.html

描述资源路径位置类型 转换为 Dalvik 格式失败，出现错误 1 ​​HelloGrid Unknown Android Packaging Problem

以及每个 drawable.sample_* 引用的一大堆这些

描述资源路径位置类型 R.drawable.sample_0 无法解析ImageAdapter.java/HelloGrid/src/com/example/ImageAdapter line 51 Java Problem

package com.example.HelloGrid;

import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.widget.AdapterView;
import android.widget.GridView;
import android.widget.Toast;
import android.widget.AdapterView.OnItemClickListener;

import com.example.ImageAdapter.ImageAdapter;

public class HelloGrid extends Activity {
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);

        GridView gridview = (GridView) findViewById(R.id.gridview);
        gridview.setAdapter(new ImageAdapter(this));

        gridview.setOnItemClickListener(new OnItemClickListener() {
            public void onItemClick(AdapterView<?> parent, View v, int position, long id) {
                Toast.makeText(HelloGrid.this, "" + position, Toast.LENGTH_SHORT).show();
            }
        });
    }
}

package com.example.ImageAdapter;
import android.R;
import android.R.drawable;
import android.content.Context;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.GridView;
import android.widget.ImageView;

public class ImageAdapter extends BaseAdapter {
    private Context mContext;

    public ImageAdapter(Context c) {
        mContext = c;
    }

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

    public Object getItem(int position) {
        return null;
    }

    public long getItemId(int position) {
        return 0;
    }

    // create a new ImageView for each item referenced by the Adapter
    public View getView(int position, View convertView, ViewGroup parent) {
        ImageView imageView;
        if (convertView == null) {  // if it's not recycled, initialize some attributes
            imageView = new ImageView(mContext);
            imageView.setLayoutParams(new GridView.LayoutParams(85, 85));
            imageView.setScaleType(ImageView.ScaleType.CENTER_CROP);
            imageView.setPadding(8, 8, 8, 8);
        } else {
            imageView = (ImageView) convertView;
        }

        imageView.setImageResource(mThumbIds[position]);
        return imageView;
    }

    // references to our images
    private Integer[] mThumbIds = {
            R.drawable.sample_2, R.drawable.sample_3,
            R.drawable.sample_4, R.drawable.sample_5,
            R.drawable.sample_6, R.drawable.sample_7,
            R.drawable.sample_0, R.drawable.sample_1,
            R.drawable.sample_2, R.drawable.sample_3,
            R.drawable.sample_4, R.drawable.sample_5,
            R.drawable.sample_6, R.drawable.sample_7,
            R.drawable.sample_0, R.drawable.sample_1,
            R.drawable.sample_2, R.drawable.sample_3,
            R.drawable.sample_4, R.drawable.sample_5,
            R.drawable.sample_6, R.drawable.sample_7
    };
}

如您所见，我已将所有图像加载到/drawable 目录中

最佳答案

Description Resource Path Location Type R.drawable.sample_0 cannot be resolved ImageAdapter.java /HelloGrid/src/com/example/ImageAdapter line 51 Java Problem

您缺少可绘制资源。 instructions supplied in the tutorial 中的步骤 #2 对此进行了介绍.

关于android - 为什么 Android SDK 教程中的代码不能开箱即用？，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/3877323/