eboy's java

package com.eboy.androidsdreadwrite;



import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.OutputStream;

import android.os.Bundle;
import android.os.Environment;

import android.app.Activity;

import android.view.Menu;
import android.view.View;
import android.view.View.OnClickListener;

import android.widget.Button;
import android.widget.Toast;

public class MainActivity extends Activity {
    
    Button btn1 = null;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);  
        setContentView(R.layout.activity_main);
        
        btn1 = (Button)findViewById(R.id.button1);
        btn1.setOnClickListener(new OnClickListener() {
            
            @Override
            public void onClick(View v) {
                // TODO Auto-generated method stub
                File file = new File(Environment.getExternalStorageDirectory(), "eboy.txt");
                
                OutputStream os = null;
                
                try {
                    os = new FileOutputStream(file);
                } catch (FileNotFoundException e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                }
                
                try {
                    os.write("Hello eboy, Hello Frr.".getBytes());
                } catch (IOException e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                }
                
                
                try {
                    os.flush();
                } catch (IOException e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                }
                try {
                    os.close();
                } catch (IOException e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                }    
                Toast toast = Toast.makeText(MainActivity.this, "寫文件到SD卡成功。eboy.txt", Toast.LENGTH_SHORT); 
                toast.show();
            }
        });    
        
        
        
        
           
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        getMenuInflater().inflate(R.menu.activity_main, menu); 
        
        
         
        
        
        return true;
    }

    
}