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   源码介绍

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package com.main;

import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.util.ArrayList;
import java.util.Locale;

import android.app.Activity;
import android.content.Context;
import android.os.Bundle;
import android.speech.tts.TextToSpeech;
import android.speech.tts.TextToSpeech.OnInitListener;
import android.util.Log;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.ListView;
import android.widget.TextView;
import android.widget.Toast;
import android.widget.AdapterView.OnItemClickListener;

public class FEMainActivity extends Activity {
	private static final String _DirRoot = "/";
	private final String _BACK_TO_ROOT="Back To /";
	public static final String _TAG = "TAG";
	String _currPath ;
	ListView lv;
	ArrayList arrl = new ArrayList();
	ArrayAdapter aa;
	TextView tv;
	Context ct;
	public OnItemClickListener _itemClickListener;
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        lv = (ListView) this.findViewById(R.id.ListView01);
        tv = (TextView) this.findViewById(R.id.tv);
        ct = this;
        getDir(new File(_DirRoot));
        
        _itemClickListener = new OnItemClickListener() {

			@Override
			public void onItemClick(AdapterView<?> parent, View view,
					int position, long id) {
				// TODO Auto-generated method stub
				String _selectItem = parent.getItemAtPosition(position)
						.toString();
				String _fileName = null;
				if (_selectItem.equals(_BACK_TO_ROOT)) {
					_fileName=_DirRoot;
				} else if(_currPath.equals(_DirRoot)){
					_fileName =_currPath _selectItem;
				}else
					_fileName = _currPath   "/"   _selectItem;
				    Log.d(_TAG, _fileName "               ");
				File f = new File(_fileName);
				if (f.canRead()) {
					if (f.isDirectory()) {
						getDir(f);
					} else if (f.getName().toLowerCase().endsWith(".txt")) {
						readText(f);
					}
				}else {

					Toast.makeText(ct, "ERRO!You Have No Right To Access!", Toast.LENGTH_LONG).show();
					
				}
			}

		};
		
		
		lv.setOnItemClickListener(_itemClickListener);
    
    
    }
    
    	
    public void getDir(File f){
    	//File f = new File(fileName);
    	_currPath = f.getPath();
    	Log.d(_TAG, _currPath);
    	tv.setText(_currPath);
    	arrl.removeAll(arrl);
    	arrl.add(_BACK_TO_ROOT);
    		File[] _f = f.listFiles();
    		for(File _temFile:_f){
    			arrl.add(_temFile.getName());
    		}
    		
    		aa = new ArrayAdapter(this, android.R.layout.simple_list_item_1, arrl);
    		lv.setAdapter(aa);
    		
    	
    }
   
    public void readText(File f){
    	
    	try {
			FileInputStream fis = new FileInputStream(f);
			
			byte[] buffer = new byte[1024]; // 你可以根据实际需要调整缓存大小
			int len = -1;
			ByteArrayOutputStream outSteam = new ByteArrayOutputStream();
			while ((len = fis.read(buffer)) != -1) {
				outSteam.write(buffer, 0, len);
			}
			outSteam.close();
			fis.close();
			String str = new String(outSteam.toByteArray());
			//Log.d(_TAG, str);
			TextToSpeech speaker = new TextToSpeech(ct, new OnInitListener(){

				@Override
				public void onInit(int status) {
					// TODO Auto-generated method stub
					Toast.makeText(ct, "it starting.......", Toast.LENGTH_LONG).show();
				}
				
			});
			
			speaker.speak(str, TextToSpeech.QUEUE_ADD, null);
		} catch (FileNotFoundException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}catch (IOException e) {
			e.printStackTrace();
			Log.d(_TAG, "IOException");
		}catch(SecurityException e){
			Log.d(_TAG, "SecurityException");
		}
    }

}