android 列表的编辑

计应111陈佳

创建列表

第一个class

public class FileListViewActivity extends Activity implements OnItemClickListener, OnClickListener {
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        getObjFromID();
       
        FileListAdapter da=new FileListAdapter(this);
        lv.setAdapter(da);
        lv.setOnItemClickListener(this);
        da.scanFiles("/");
       
        btnUp.setOnClickListener(this);
    }
    ListView lv;
    TextView t1;
    Button btnUp;
   
    void getObjFromID()
    {
        t1=(TextView) findViewById(R.id.t1);
        lv=(ListView) findViewById(R.id.listView1);
     btnUp=(Button) findViewById(R.id.btnUp);
    }
   
 @Override
 public void onItemClick(AdapterView<?> parent, View view,
   int position,long id) {
  FileListAdapter da= (FileListAdapter) lv.getAdapter();
  File f= da.list.get(position);
  if(f.isDirectory())
  {
   t1.setText(f.getPath());
   da.scanFiles(f.getPath());
  }
 }

 @Override
 public void onClick(View v) {
 
  FileListAdapter da= (FileListAdapter) lv.getAdapter();
  if(da.currPath.equals("/")) return;
  File f=new File(da.currPath);
  t1.setText(f.getParent());
  da.scanFiles(f.getParent());
 
 }
}

第二个class

public class FileListAdapter extends BaseAdapter {

 public Activity activity; 

 public List<File> list=new LinkedList<File>();
 public String currPath;
 
 public FileListAdapter(Activity activity) {
  this.activity = activity;
 }

 public void scanFiles(String path)
 {
  list.clear();
  File dir=new File(path);
  File[] subFiles=dir.listFiles();
  if(subFiles!=null)
   for(File f:subFiles)
    list.add(f);
  this.notifyDataSetChanged();
  currPath=path;
 }
 
 @Override
 public int getCount() {
  // TODO Auto-generated method stub
  return list.size();
 }

 @Override
 public Object getItem(int position) {
  // TODO Auto-generated method stub
  return null;
 }

 @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
 
  View v=View.inflate(activity, R.layout.item, null);
  TextView txtName= (TextView) v.findViewById(R.id.txtName);
  ImageView imgIcon=(ImageView) v.findViewById(R.id.imgIcon);
  File f=list.get(position);
  txtName.setText(f.getName());
  Bitmap bmp_folder=BitmapFactory.decodeResource(
    activity.getResources(),R.drawable.folder);
  Bitmap bmp_file=BitmapFactory.decodeResource(
    activity.getResources(),R.drawable.file);
  if(f.isDirectory())
   imgIcon.setImageBitmap(bmp_folder);
  else
   imgIcon.setImageBitmap(bmp_file);
  return v;
 }

}

第三个class

public class FileBean implements Comparator<Object>{

 private File file; 
 private Bitmap icon;
 private String name;
 private String path;
 private String size;
 private String type;

 public File getFile() {
  return file;
 }

 public void setFile(File file) {
  this.file = file;
 }

 public Bitmap getIcon() {
  return icon;
 }

 public void setIcon(Bitmap icon) {
  this.icon = icon;
 }

 public String getName() {
  return name;
 }

 public void setName(String name) {
  this.name = name;
 }

 public String getPath() {
  return path;
 }

 public void setPath(String path) {
  this.path = path;
 }

 public String getFileSize() {
  return size;
 }

 public void setFileSize(String fileSize) {
  this.size = fileSize;
 }

 public String getFileStyle() {
  return type;
 }

 public void setFileStyle(String style) {
  this.type = style;
 }

 @Override
 public int compare(Object object1, Object object2) {
  FileBean file1 = (FileBean)object1;
  FileBean file2 = (FileBean)object2;
  return file1.getName().compareToIgnoreCase(file2.getName());
 }
}

运行结果：

总结：列表显示总的来说就是几个不同的类，通过相继承的关系来实现目录之间的转换。