Android 可選文件格式瀏覽器

package training.filesystem;

import java.io.BufferedReader;
import java.io.File;
import java.io.FileReader;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.Map;

import android.R.integer;
import android.R.layout;
import android.app.AlertDialog;
import android.app.ListActivity;
import android.content.DialogInterface;
import android.os.Bundle;
import android.view.Display;
import android.view.Gravity;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.Window;
import android.view.WindowManager;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.AdapterView.OnItemSelectedListener;
import android.widget.ArrayAdapter;
import android.widget.LinearLayout.LayoutParams;
import android.widget.Button;
import android.widget.ListView;
import android.widget.SimpleAdapter;
import android.widget.Spinner;
import android.widget.TextView;
import android.widget.Toast;

public class FilesystemActivity extends ListActivity implements OnClickListener, OnItemSelectedListener {
	private TextView hint;
	private ListView list;
	private TextView filename;
	private Spinner filetype;
	private Button oKButton,cancelButton;
	private String root = "/";
	private String root_sdcard = "/mnt/sdcard";
	private ArrayList<String> path;
	private ArrayList<Map<String, Object>> item;
	private ArrayList<Version> aboutVersionList = new ArrayList<Version>();
	private String pathString;
	private String PATH_FILE_NAME;
	private AlertDialog warnAlertDialog;
	private AlertDialog errorAlertDialog;
	/** Called when the activity is first created. */
	@Override
	public void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		requestWindowFeature(Window.FEATURE_NO_TITLE);
		setContentView(R.layout.main);
		hint = (TextView) findViewById(R.id.path);
		filename =(TextView)findViewById(R.id.name);
		oKButton = (Button)findViewById(R.id.ok);
		cancelButton = (Button)findViewById(R.id.cancel);
		filetype = (Spinner)findViewById(R.id.spinner);
		filetype.setOnItemSelectedListener(this);
		list = this.getListView();
		oKButton.setOnClickListener(this);
		cancelButton.setOnClickListener(this);
		getfiledir(root_sdcard,0);
		
		
		
		WindowManager manager = getWindowManager();
		Display display = manager.getDefaultDisplay();
		android.view.WindowManager.LayoutParams params = getWindow().getAttributes();
		params.height = (int)(display.getHeight() * 0.5);
		params.width = (int)(display.getWidth() * 0.5);
		params.dimAmount = 0.0f;
		getWindow().setAttributes(params);
		getWindow().setGravity(Gravity.CENTER);

	}

	protected void getfiledir(String filepath,int type) {
		final int abcd = type;
		item = new ArrayList<Map<String, Object>>();
		path = new ArrayList<String>();
		hint.setText(filepath);
		pathString = filepath;
		File f = new File(filepath);
		File[] files = f.listFiles();
		if (!filepath.equals(root)) {
			Map<String, Object> map = new HashMap<String, Object>();
			map.put("icon", R.drawable.up_folder);
			map.put("name", "back to /");
			item.add(map);
			path.add("/mnt/sdcard/");
			Map<String, Object> map2 = new HashMap<String, Object>();
			map2.put("icon", R.drawable.up_folder);
			map2.put("name", "back to ../");
			item.add(map2);
			path.add(f.getParent());
		}
		if (files != null) {
			for (int i = 0; i < files.length; i++) {
				if(type == 0){
					Map<String, Object> map = new HashMap<String, Object>();
					
					if (files[i].isDirectory()) {
						map.put("icon", R.drawable.folder);
					}else {
						map.put("icon", R.drawable.file);
					}
					map.put("name", files[i].getName());
					item.add(map);
					path.add(files[i].getPath());
				}else if (type == 1) {
					if (files[i].isDirectory()) {
						Map<String , Object> map = new HashMap<String, Object>();
						map.put("icon", R.drawable.folder);
						map.put("name", files[i].getName());
						item.add(map);
						path.add(files[i].getPath());
					}
				}else if (type == 2) {
					if (files[i].isFile()) {
						Map<String, Object> map = new HashMap<String, Object>();
						map.put("icon", R.drawable.file);
						map.put("name", files[i].getName());
						item.add(map);
						path.add(files[i].getPath());
					}
				}
			}
		}
		SimpleAdapter simpleAdapter = new SimpleAdapter(FilesystemActivity.this, item, R.layout.line, new String[]{"icon","name"}, new int[]{R.id.icon,R.id.name});
		list.setAdapter(simpleAdapter);
		list.setOnItemClickListener(new OnItemClickListener() {

			@Override
			public void onItemClick(AdapterView<?> arg0, View arg1, int arg2,
					long arg3) {
				// TODO Auto-generated method stub
				File file = new File(path.get(arg2));
				if (file.isDirectory()) {
					getfiledir(path.get(arg2),abcd);
				} else {
					Toast.makeText(FilesystemActivity.this, "这是一个文件!",
							Toast.LENGTH_SHORT).show();
					filename.setText(file.getName());
					PATH_FILE_NAME = file.getName();
				}
			}

		});
	}
	public boolean GetVersionInfo(){
		String tempString = null;
		boolean isHaveVersion = false;
		try {
			File file = new File(pathString + "/" + PATH_FILE_NAME);
			FileReader fileReader = new FileReader(file);
			BufferedReader bufferedReader = new BufferedReader(fileReader);
			while ((tempString = bufferedReader.readLine()) != null) {
				if (tempString.startsWith("[")) {
					if (tempString.substring(tempString.indexOf("[")+1,tempString.indexOf("]")).equals("Version")) {
						tempString = bufferedReader.readLine();
						Version version = new Version();
						String[] splitString = tempString.split(",");
						if (splitString.length != 3) {
							break;
						}
						version.VERSION_ID = splitString[0];
						version.VERSION_DEVICE = splitString[1];
						version.VERSION_PLATFORM = splitString[2];
						aboutVersionList.add(version);
						isHaveVersion = true;
						break;
					}
				}
				
			}
		} catch (Exception e) {
			// TODO: handle exception
			e.printStackTrace();
			return false;
		}
		if (isHaveVersion) {
			return true;
		}else {
			return false;
		}
	}
	public class Version{
		String VERSION_ID;
		String VERSION_PLATFORM;
		String VERSION_DEVICE;
	}
	@Override
	public void onClick(View v) {
		// TODO Auto-generated method stub
		if (v == oKButton) {
			if(GetVersionInfo()){
				Version version = aboutVersionList.get(0);
				warnAlertDialog = new AlertDialog.Builder(this).setIcon(R.drawable.warning).setTitle(getText(R.string.dialog_title))
						.setMessage(getText(R.string.dialog_content_id) + version.VERSION_ID +"\n" +
								getText(R.string.dialog_content_platform) + version.VERSION_PLATFORM + "\n" +
								getText(R.string.dialog_content_device) + version.VERSION_DEVICE + "\n" +
								getText(R.string.dialog_content)).setPositiveButton(getText(R.string.dialog_ok), new DialogInterface.OnClickListener() {
									
									@Override
									public void onClick(DialogInterface dialog, int which) {
										// TODO Auto-generated method stub
										
									}
								}).setNegativeButton(getText(R.string.dialog_cancel), new DialogInterface.OnClickListener() {
									
									@Override
									public void onClick(DialogInterface dialog, int which) {
										// TODO Auto-generated method stub
										
									}
								}).show();
			}else {
				errorAlertDialog = new AlertDialog.Builder(this).setIcon(R.drawable.warning).setTitle(getText(R.string.dialog_title))
						.setMessage(getText(R.string.dialog_error))
						.setPositiveButton(getText(R.string.dialog_ok), new DialogInterface.OnClickListener() {
							
							@Override
							public void onClick(DialogInterface dialog, int which) {
								// TODO Auto-generated method stub
								
							}
						}).show();
			}
		}
	}

	@Override
	public void onItemSelected(AdapterView<?> arg0, View arg1, int arg2, long arg3) {
		// TODO Auto-generated method stub
		String aString = filetype.getSelectedItem().toString();
		if (aString.equals("所有档案")) {
			getfiledir(pathString,0);
		}else if (aString.equals("文件夹")) {
			getfiledir(pathString, 1);
		}else if (aString.equals("文件")) {
			getfiledir(pathString, 2);
		}
	}

	@Override
	public void onNothingSelected(AdapterView<?> arg0) {
		// TODO Auto-generated method stub
		
	}
}