/*********************************************************************

 * Author  : Samson

 * Date    : 04/22/2014

 * Test platform:

 *              3.11.0-12-generic #19-Ubuntu

 *              GNU bash, version 4.2.45

 * *******************************************************************/

package com.example.listfile;

import java.io.File;

import java.io.IOException;   

import android.app.Activity;

import android.content.Context;

import android.widget.TextView;

import android.os.Bundle;

import android.os.Process;

public class MainActivity extends Activity

{

    /** Called when the activity is first created. */

    @Override

    public void onCreate(Bundle savedInstanceState)

    {

        super.onCreate(savedInstanceState);

        int myProcessID = Process.myPid();

        File yygypath = this.getFilesDir();//this.getCacheDir();

        String yygypathstr = yygypath.toString();

        File file = new File(yygypath, "yygytest");

        try {

			file.createNewFile();

		} catch (IOException e) {

			// TODO Auto-generated catch block

			e.printStackTrace();

		}

        yygypathstr = yygypathstr + " pid is " + myProcessID;

        TextView  tv = new TextView(this);

        tv.setText(yygypathstr);

        setContentView(tv);

    }

    public void onDestory()

    {

    	super.onDestroy();

    	this.finish();

    	android.os.Process.killProcess(android.os.Process.myPid());

    	System.exit(0);

    }

}

主要是这两个函数：
this.getFilesDir(); 这个是得到当前app文件夹下的files文件夹路径

this.getCacheDir(); 这个是得到当前app文件夹下的cache文件夹路径
结果：
adb shell result:
 root@generic:/data/data/com.example.listfile/files # ll                        
-rw------- u0_a53   u0_a53          0 2014-04-21 13:38 yygytest
root@generic:/data/data/com.example.listfile/files #