我正在尝试使用Gridview显示我放置在drawable文件夹中的图片。我收到了一些错误。我的代码和我得到的错误如下所示。
package com.newapp;
import android.R;
import android.R.drawable;
import android.app.Activity;
import android.content.Context;
import android.os.Bundle;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AdapterView;
import android.widget.BaseAdapter;
import android.widget.GridView;
import android.widget.ImageView;/*Error here: main cannot be resolved or is not a field*/
import android.widget.Toast;
import android.widget.AdapterView.OnItemClickListener;
public class MainActivity extends Activity {
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);/*Error here: main cannot be resolved or is not a field*/
GridView gridview = (GridView) findViewById(R.id.photogrid);
gridview.setAdapter(new ImageAdapter(this));
gridview.setOnItemClickListener(new OnItemClickListener() {
public void onItemClick(AdapterView<?> parent, View v, int position, long id) {
Toast.makeText(MainActivity.this, "" + position, Toast.LENGTH_SHORT).show();
}
});
}
}
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_0, /*Error here: sample_0 cannot be resolved and is not a field*/
R.drawable.sample_1,/*Error here: sample_1 cannot be resolved and is not a field*/
R.drawable.sample_2,/*Error here: sample_2 cannot be resolved and is not a field*/
R.drawable.sample_3,/*Error here: sample_3 cannot be resolved and is not a field*/
R.drawable.sample_4,/*Error here: sample_4 cannot be resolved and is not a field*/
R.drawable.sample_5/*Error here: sample_5 cannot be resolved and is not a field*/,
R.drawable.sample_6,
/*Error here: sample_6 cannot be resolved and is not a field*/
};
}
那么有人可以告诉我是什么原因导致了这些问题吗?任何帮助都感激不尽。 提前致谢
答案 0 :(得分:3)
这是您的第一个问题:import android.R
不要导入这个,因为这是android系统的R包,而不是你自己的项目的R文件,因此main无法识别,因为你在android.R包中指向main的R不存在。< / p>
如果删除此导入,将识别“main”,因为将引用您自己的R文件。同样的规则适用于ImageAdapter。如果您删除导入:import android.R.drawable
,您将避免在此课程中遇到的问题。