Android获取SD卡路径及SDCard内存的方法

private String folder = "/sdcard/DCIM/Camera/"（SD卡上拍照程序的图片存储路径）; //写死绝对路径，不赞成使用

public String getSDPath(){
       File sdDir = null;
       boolean sdCardExist = Environment.getExternalStorageState()  
       .equals(android.os.Environment.MEDIA_MOUNTED);//判断sd卡是否存在
       if(sdCardExist)  
       {                              
         sdDir = Environment.getExternalStorageDirectory();//获取跟目录
      }  
       return sdDir.toString();
}

String fileName = getSDPath() +"/" + name;//以name存在目录中

package com.terry;

import java.io.File;
import java.text.DecimalFormat;

import android.R.integer;
import android.app.Activity;
import android.os.Bundle;
import android.os.Environment;
import android.os.StatFs;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.ProgressBar;
import android.widget.TextView;
import android.widget.Toast;
public class getStorageActivity extends Activity {
private Button myButton;
/** Called when the activity is first created. */
@Override
public
void onCreate(Bundle savedInstanceState) {
      super.onCreate(savedInstanceState);
       setContentView(R.layout.main);
       findView();
       viewHolder.myButton.setOnClickListener(new OnClickListener() {
         @Override
         public
void onClick(View arg0) {
            // TODO Auto-generated method stub
            getSize();
         }
       });
}
void findView(){
       viewHolder.myButton=(Button)findViewById(R.id.Button01);
       viewHolder.myBar=(ProgressBar)findViewById(R.id.myProgressBar);
       viewHolder.myTextView=(TextView)findViewById(R.id.myTextView);
}
void getSize(){
       viewHolder.myTextView.setText("");
       viewHolder.myBar.setProgress(0);
      //判断是否有插入存储卡
if(Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED)){
         File path =Environment.getExternalStorageDirectory();
         //取得sdcard文件路径
         StatFs statfs=new StatFs(path.getPath());
         //获取block的SIZE
long blocSize=statfs.getBlockSize();
         //获取BLOCK数量
long totalBlocks=statfs.getBlockCount();
         //己使用的Block的数量
long availaBlock=statfs.getAvailableBlocks();
         String[] total=filesize(totalBlocks*blocSize);
         String[] availale=filesize(availaBlock*blocSize);
         //设置进度条的最大值
int maxValue=Integer.parseInt(availale[0])
         *viewHolder.myBar.getMax()/Integer.parseInt(total[0]);
         viewHolder.myBar.setProgress(maxValue);
         String Text="总共："+total[0]+total[1]+"/n"
+"可用:"+availale[0]+availale[1];
         viewHolder.myTextView.setText(Text);
       }else
if(Environment.getExternalStorageState().equals(Environment.MEDIA_REMOVED)){
         Toast.makeText(getStorageActivity.this, "没有sdCard",1000).show();
       }
}
//返回数组，下标1代表大小，下标2代表单位 KB/MB
String[] filesize(long size){
       String str="";
      if(size>=1024){
         str="KB";
         size/=1024;
         if(size>=1024){
            str="MB";
            size/=1024;
         }
       }
       DecimalFormat formatter=new DecimalFormat();
       formatter.setGroupingSize(3);
       String result[] =new String[2];
       result[0]=formatter.format(size);
       result[1]=str;
      return result;
}
}