gridview 显示sdcard中图片的问题

你打印看下picFiles里面的东西呢，

弱弱的问下我那个SimpleAdapter有问题吗？因为那里我不是很懂我看有些人这样用我就拿来用了

好了  终于被我弄出来了     上面的那个也许不是很好理解这个好点我把代码贴出来  也是用了别人的代码（http://www.eoeandroid.com/thread-174314-1-1.html）额。代码有点乱不过这个代码是对的   有些地方我没注意  也不知道重不重要就没管//+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++public class MainActivity extends Activity {
private int Position= 0;
private String fileName = null;
    private String suffix = null;
    private File sdcardDir=null;
private List<HashMap<String, String>>  picFiles = new ArrayList<HashMap<String,String>>();
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.gallyshow);
//this.context = context;
boolean isSDExist=Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED);
if(isSDExist){//如果Sdcard存在执行下面的
      sdcardDir=Environment.getExternalStorageDirectory();
      String sdPath = sdcardDir.toString();
      System.out.println(sdPath);
      File file = new File(sdPath);
      File[] files = file.listFiles();

      for(int i=0;i<files.length;i++)
      {  if(files[i].isFile()){itIsfile(files[i]);}

       else{ itNotfile(files[i]);}
      }}
}


private void itIsfile(File file) {
// TODO Auto-generated method stub
  fileName = file.getName();
  Position=fileName.indexOf(".");
  GridView gridView = (GridView)findViewById(R.id.gridview);
  HashMap<String,String> pic = new HashMap<String, String>();
          if(Position>0){
  suffix=fileName.substring(Position+1);
  if(suffix.equals("jpg")||suffix.equals("png")){
     if(file.length()<20000){
                     pic.put("image", file.getPath());
     picFiles.add(pic);    }
   }
}
          ImageAdapter adapter = new ImageAdapter(MainActivity.this,picFiles);
          gridView.setAdapter(adapter);
}

private void itNotfile(File file) {
// TODO Auto-generated method stub
File[] files = file.listFiles();
    if(files==null){return;}
for(int i=0;i<files.length;i++)
      {  if(files[i].isFile()){itIsfile(files[i]);}

        if(!files[i].isFile()){itNotfile(files[i]);}
      }
}

//+++++++++++++++++++++++++++++++++++++++++++ImageAdapter适配器+++++++++++++++++++++++++++++++++++
class ImageAdapter extends BaseAdapter{ public ImageAdapter(MainActivity mainActivity,
List<HashMap<String, String>> picFiles) {
// TODO Auto-generated constructor stub
} @Override
public int getCount() {
// TODO Auto-generated method stub
System.out.println("+++++++++++++++++++++++++++文件大小+++++++++++++++++++++++++++++++++++");
System.out.println(picFiles.size());
return picFiles.size();
} @Override
public Object getItem(int arg0) {
// TODO Auto-generated method stub
return picFiles.get(arg0);
} @Override
public long getItemId(int arg0) {
// TODO Auto-generated method stub
return arg0;
} @Override
public View getView(int arg0, View arg1, ViewGroup arg2) {
// TODO Auto-generated method stub
//picFiles.get(arg0);
//System.out.println("+++++++++++++++++++++++++文件位置+++++++++++++++++++++++++++++");
//System.out.println(picFiles.get(arg0));
//HashMap<String, String> hash = picFiles.get(arg0);
ImageView imageview = new ImageView(MainActivity.this);
Map<String,String> fsPath = picFiles.get(arg0);
String image=(String)fsPath.get("image");
File fl=new File(image);
try {
FileInputStream fin=new FileInputStream(fl);
BufferedInputStream bin=new BufferedInputStream(fin);

Bitmap bm=BitmapFactory.decodeStream(bin);
Bitmap thbm=ThumbnailUtils.extractThumbnail(bm, 150,150);
//System.out.println("++++++++++++++++++显示到gridview中的图片++++++++++++++++++++");
//System.out.println(thbm);
imageview.setImageBitmap(thbm);//将略缩图设置到ImageView上
//bin.close();
fin.close();
bm.recycle();

}
catch(Exception e){

}
return imageview;
}

}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.activity_main, menu);
return true;
}}

一个号只能回复自己三次没办法上小号
//++++++++++++++++++++++++++++++++++
唉   其实第一次犯的错和第二次都一样  都是把private HashMap<String,String> pic = new HashMap<String, String>();这个放错位置的缘故把他的位置改为第二个那样就对了，其它地方都没问题是对的只不过代码太乱了

啊要死啊  感觉什么都不懂啊   估计我说了半天  也没说明白啥   好了   换号  结贴嘞！

请问一下楼主我的什么也显示不出来是一个空白是不是要先在sdcard添加图片资源？

调试易

gridview 显示sdcard中图片的问题

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