Android检测手机中存储卡及剩余空间大小的方法(基于Environment,StatFs及DecimalFormat)

import java.io.File;
import java.text.DecimalFormat;
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;
public class A08Activity extends Activity {
 private TextView tv;//用来显示存储卡的情况
 private Button b;//触发检测存储卡事件
 private ProgressBar pb;//用ProgressBar来显示存储卡的状况
  /** Called when the activity is first created. */
  @Override
  public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);
    tv=(TextView)findViewById(R.id.tv);
    b=(Button)findViewById(R.id.button);
    pb=(ProgressBar)findViewById(R.id.pb);
    b.setOnClickListener(new OnClickListener(){
  @Override
  public void onClick(View v) {
  // TODO Auto-generated method stub
  showSize();//用来检测存储卡的存储情况
  }
  });
  }
 protected void showSize() {
 // TODO Auto-generated method stub
 tv.setText("");
 pb.setProgress(0);
 //用来检测存储卡是否存在
 if(Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED)){
  //如果存储卡存在，则获取存储文件的路径
  File path=Environment.getExternalStorageDirectory();
  StatFs sf=new StatFs(path.getPath());//创建StatFs对象
  long blockSize=sf.getBlockSize();//获得blockSize
  long totalBlock=sf.getBlockCount();//获得全部block
  long availableBlock=sf.getAvailableBlocks();//获取可用的block
  //用String数组来存放Block信息
  String[] total=fileSize(totalBlock*blockSize);
  String[] available=fileSize(availableBlock*blockSize);
  //在ProgressBar中显示可用空间的大小
  int a=Integer.parseInt(available[0]);
  pb.setProgress(a);
  String s="SD卡中空间总共有："+total[0]+total[1]+"\n";
  s+="剩余空间大小："+available[0]+available[1];
  tv.setText(s);
 }
 else if(Environment.getExternalStorageState().equals(Environment.MEDIA_REMOVED)){
  tv.setText("SD卡已移除");
 }
 }
 //用来定义存储空间显示格式
 public String[] fileSize(long size){
 String s="";
 if(size>1024){
  s="KB";
  size/=1024;
  if(size>1024){
  s="MB";
  size/=1024;
  }
 }
 DecimalFormat df=new DecimalFormat();
 df.setGroupingSize(3);
 String[] result=new String[3];
 result[0]=df.format(size);
 result[1]=s;
 return result;
 }
}