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;//用來顯示存儲卡的情況 private Button b;//觸發檢測存儲卡事件 private ProgressBar pb;//用ProgressBar來顯示存儲卡的狀況  /** 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();//用來檢測存儲卡的存儲情況  }  });  } protected void showSize() { // TODO Auto-generated method stub tv.setText(""); pb.setProgress(0); //用來檢測存儲卡是否存在 if(Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED)){  //如果存儲卡存在，則獲取存儲文件的路徑  File path=Environment.getExternalStorageDirectory();  StatFs sf=new StatFs(path.getPath());//創建StatFs對象  long blockSize=sf.getBlockSize();//獲得blockSize  long totalBlock=sf.getBlockCount();//獲得全部block  long availableBlock=sf.getAvailableBlocks();//獲取可用的block  //用String數組來存放Block信息  String[] total=fileSize(totalBlock*blockSize);  String[] available=fileSize(availableBlock*blockSize);  //在ProgressBar中顯示可用空間的大小  int a=Integer.parseInt(available[0]);  pb.setProgress(a);  String s="SD卡中空間總共有："+total[0]+total[1]+"/n";  s+="剩余空間大小："+available[0]+available[1];  tv.setText(s); } else if(Environment.getExternalStorageState().equals(Environment.MEDIA_REMOVED)){  tv.setText("SD卡已移除"); } } //用來定義存儲空間顯示格式 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; }}