自定义适配器：
public class MyAdapter extends BaseAdapter{
private LayoutInflater inflater;
private Bitmap directory,file;
//存储文件名称
private ArrayList<String> names = null;
//存储文件路径
private ArrayList<String> paths = null;
//参数初始化
public MyAdapter(Context context,ArrayList<String> na,ArrayList<String> pa){
names = na;
paths = pa;
directory = BitmapFactory.decodeResource(context.getResources(),R.drawable.d);
file = BitmapFactory.decodeResource(context.getResources(),R.drawable.f);
//缩小图片
directory = small(directory,0.16f);
file = small(file,0.1f);
inflater = LayoutInflater.from(context);
}
@Override
public int getCount() {
// TODO Auto-generated method stub
return names.size();
}
@Override
public Object getItem(int position) {
// TODO Auto-generated method stub
return names.get(position);
}
@Override
public long getItemId(int position) {
// TODO Auto-generated method stub
return position;
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
// TODO Auto-generated method stub
ViewHolder holder;
if (null == convertView){
convertView = inflater.inflate(R.layout.file, null);
holder = new ViewHolder();
holder.text = (TextView)convertView.findViewById(R.id.textView);
holder.image = (ImageView)convertView.findViewById(R.id.imageView);
convertView.setTag(holder);
}
else {
holder = (ViewHolder)convertView.getTag();
}
File f = new File(paths.get(position).toString());
if (names.get(position).equals("@1")){
holder.text.setText("/");
holder.image.setImageBitmap(directory);
}
else if (names.get(position).equals("@2")){
holder.text.setText("..");
holder.image.setImageBitmap(directory);
}
else{
holder.text.setText(f.getName());
if (f.isDirectory()){
holder.image.setImageBitmap(directory);
}
else if (f.isFile()){
holder.image.setImageBitmap(file);
}
else{
System.out.println(f.getName());
}
}
return convertView;
}
private class ViewHolder{
private TextView text;
private ImageView image;
}
private Bitmap small(Bitmap map,float num){
Matrix matrix = new Matrix();
matrix.postScale(num, num);
return Bitmap.createBitmap(map,0,0,map.getWidth(),map.getHeight(),matrix,true);
}
}
因为要对文件进行操作，所以在描述文件中授权：
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://www.easck.com/apk/res/android"
package="com.test.filemanager"
android:versionCode="1"
android:versionName="1.0">
<uses-sdk android:minSdkVersion="10" />
<strong> <uses-permission android:name="android.permission.MOUNT_UNMOUNT_FILESYSTEMS"/>
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/></strong>
<application android:icon="@drawable/icon" android:label="@string/app_name">
<activity android:name=".MainActivity"
android:label="@string/app_name">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>
</manifest>
