Android 读取U盘或SD卡中的所有.txt文件

Android 读取U盘或SD卡中的所有文件

源码下载：

https://download.csdn.net/download/qq_31939617/10491366 下载

读取U盘中的文件，需要获取U盘的路径，可看另一篇帖子：https://blog.csdn.net/qq_31939617/article/details/80447276

package com.example.sz.readfile;

import java.io.File;

import java.util.ArrayList;
import java.util.HashMap;

import android.os.Bundle;
import android.os.Environment;
import android.app.Activity;
import android.util.Log;

import android.view.View;
import android.widget.ListView;
import android.widget.SimpleAdapter;
import android.widget.TextView;


public class MainActivity extends Activity {
    private static final String TAG = "MainActivity";

    private ListView lv;
    ArrayList name;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        lv = (ListView) findViewById(R.id.lv);
        name = new ArrayList();

        TextView tv = findViewById(R.id.textView1);
        tv.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                //读取SD卡
       /* if (Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED)) {
            File path = Environment.getExternalStorageDirectory();// 获得SD卡路径
            // File path = new File("/mnt/sdcard/");
            File[] files = path.listFiles();// 读取
            getFileName(files);
        }
        */

                //读取U盘
                File path = new File("/mnt/usbhost1");//外置U盘路径
                File[] files = path.listFiles();// 读取
                getFileName(files);


                SimpleAdapter adapter = new SimpleAdapter(MainActivity.this, name, R.layout.pes, new String[]{"Name"}, new int[]{R.id.txt_tv});
                lv.setAdapter(adapter);
                for (int i = 0; i < name.size(); i++) {
                    Log.e(TAG, "list. name: " + name.get(i));
                }
            }
        });


    }

    private void getFileName(File[] files) {
        if (files != null) {// 先判断目录是否为空，否则会报空指针
            String fileName = null;
            for (File file : files) {
                if (file.isDirectory()) {
                    Log.e(TAG, "若是文件目录。继续读1" + file.getName().toString() + file.getPath().toString());
                    getFileName(file.listFiles());
                    Log.e(TAG, "若是文件目录。继续读2" + file.getName().toString() + file.getPath().toString());
                } else {
                    fileName = file.getName();
                    if (fileName.endsWith(".txt")) {
                        HashMap map = new HashMap();
                        String s = fileName.substring(0, fileName.lastIndexOf(".")).toString();
                        Log.i(TAG, "文件名txt：：  " + s);
                        map.put("Name", fileName.substring(0, fileName.lastIndexOf(".")));
                        name.add(map);
                    }
                }
            }
        }
    }
}

源码下载：

https://download.csdn.net/download/qq_31939617/10491366 下载