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; }}