NDK遍历sdcard简单实例（与java代码的速度对比）

package com.docintest; import java.io.File; import java.util.Calendar; import android.app.Activity; import android.os.Bundle; import android.util.Log; import android.widget.TextView; public class ListDirectory extends Activity{ public void onCreate(Bundle save) { super.onCreate(save); setContentView(R.layout.listdirectory); String root="/sdcard/"; Calendar rightNow = Calendar.getInstance(); long start_millis=rightNow.getTimeInMillis(); ListDirectory ls=new ListDirectory(); ls.getDir(root); long end_millis=Calendar.getInstance().getTimeInMillis(); long result=end_millis-start_millis; Log.v("Total time waste.......................:",(float)result/1000+" second"); TextView tv=(TextView)findViewById(R.id.javalist); tv.setText("Total time waste:"+(float)result/1000+" second"); } public void getDir(String path) { File file=new File(path); if(file.exists()) { if(file.isDirectory()) { File f[]=file.listFiles(); if(f!=null) { for(int i=0;i<f.length;i++) { if(f[i].isDirectory()) { getDir(f[i].getPath()); } else { } } } } else { //System.out.println("file="+file.getParent()+file.getName()); } } else { Log.v("Java..............","no sdcard"); } } }