Android自定义用于浏览文件的Adapter

我自用的好些应用都要选择文件，但总不能每次写个Activity或ListView去浏览文件吧。所以写个Adapter，这样以后再有用到文件浏览或文件选择的话直接把这个Adapter放进ListView或GridView就行了，这样比较方便。

 

Adapter：

public class KFileAdapter extends BaseAdapter{

    
    private File mFile;
    private List<File> mList;
    private Context mContext;
    private FileSelectListener mListener;
    
    public KFileAdapter(Context context,FileSelectListener listener){
        mContext=context;
        mListener=listener;
        mFile=Environment.getExternalStorageDirectory();
        mList=new ArrayList<File>();
        try {
            getFileList(mList, mFile);
        } catch (Exception e) {
            // TODO Auto-generated catch block
            Toast.makeText(mContext, "请检查SD卡", Toast.LENGTH_SHORT).show();
        }
    }
    @Override
    public int getCount() {
        // TODO Auto-generated method stub
        return mList.size();
    }
    
    private void getFileList(List<File> list,File dir) throws Exception {
        File[] array=dir.listFiles();
        list.clear();
        if(!dir.equals(Environment.getExternalStorageDirectory()))
        list.add(dir.getParentFile());
        for (File file : array) {
            list.add(file);
        }
    }
    
    private void listFile() throws Exception{
        getFileList(mList, mFile);
        notifyDataSetChanged();
    }

    @Override
    public File getItem(int arg0) {
        // TODO Auto-generated method stub
        return mList.get(arg0);
    }

    @Override
    public long getItemId(int position) {
        // TODO Auto-generated method stub
        return 0;
    }

    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
        // TODO Auto-generated method stub
        if(convertView==null){
            FrameLayout fl=new FrameLayout(mContext);
            convertView=fl;
            fl.setPadding(8, 8, 8, 8);
            fl.setBackgroundColor(0xffdddddd);
            TextView tmp=new TextView(mContext);
            fl.setTag(new ViewTag(getItem(position), tmp));
            fl.addView(tmp, ViewGroup.LayoutParams.WRAP_CONTENT, ViewGroup.LayoutParams.WRAP_CONTENT);
            convertView.setOnClickListener(new OnClickListener() {
                
                @Override
                public void onClick(View v) {
                    // TODO Auto-generated method stub
                    File tag=((ViewTag)v.getTag()).getFile();
                    if(tag.isDirectory()){
                        mFile=tag;
                        try {
                            listFile();
                            mFile=tag;
                        } catch (Exception e) {
                            // TODO Auto-generated catch block
                            Toast.makeText(mContext, "无法打开", Toast.LENGTH_SHORT).show();
                        }
                        
                    }else
                        mListener.fileSelect(tag);
                }
            });
        }
        ViewTag tag=(ViewTag)convertView.getTag();
        tag.setFile(getItem(position));
        TextView tmp=tag.getTextView();
        if(!mFile.equals(Environment.getExternalStorageDirectory())&&position==0){
        
        tmp.setText("...");
        }else{
            tmp.setText(getItem(position).getName());
        }
        
        return convertView;
    }
    
    
    public interface FileSelectListener{
        public abstract void fileSelect(File file);
    }
    
    private class ViewTag{
        private File file;
        private TextView textView;
        public ViewTag(File file,TextView textView){
            this.file=file;
            this.textView=textView;
        }
        public File getFile() {
            return file;
        }
        public void setFile(File file) {
            this.file = file;
        }
        public TextView getTextView() {
            return textView;
        }
        public void setTextView(TextView textView) {
            this.textView = textView;
        }
        
        
        
    }

}

 

构造函数里的监听器里的代码在用户点击文件（非文件夹）时执行，想要点击文件夹执行的话改下

convertView.setOnClickListener(new OnClickListener() {
               
                @Override
                public void onClick(View v) {

         //添加你的代码
                         });

 

 

 

 

测试用的Activity：

public class MainActivity extends Activity {
    
    

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        
       
        ListView v=(ListView)findViewById(R.id.listView1);
        
        v.setAdapter(new KFileAdapter(this, new FileSelectListener() {
            
            @Override
            public void fileSelect(File file) {
                // TODO Auto-generated method stub
                Log.i("kagami", file.getName());
            }
        }));
        
        
     GridView g=(GridView)findViewById(R.id.gridView1);
        
        g.setAdapter(new KFileAdapter(this, new FileSelectListener() {
            
            @Override
            public void fileSelect(File file) {
                // TODO Auto-generated method stub
                Log.i("kagami", file.getName());
            }
        }));
     
    }

   
    
    
}

 

 

上半是ListView，下半是GridView：