cocos creator Android版（打开文件选择器，选择文本文件读取文件内容）

package org.cocos2dx.javascript;

import android.Manifest;
import android.app.Activity;
import android.content.Intent;
import android.net.Uri;
import android.os.Build;
import android.os.Environment;
import android.os.Looper;
import android.util.Log;

import java.io.BufferedReader;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;

public class SelectFile {
    private static  SelectFile instance = null;
    public static SelectFile getInstance(){
        if(instance == null){
            instance = new SelectFile();
        }
        return  instance;
    }

    public static AppActivity mainActivity = null;
    // 在AppActivity中的onCreate调用该函数进行初始化
    public void init(AppActivity activity){

        mainActivity = activity;

        // 需要动态获取读取内存文件读取权限
        if (Build.VERSION.SDK_INT >= 23) {
            int REQUEST_CODE_PERMISSION_STORAGE = 100;
            String[] permissions = {
                    Manifest.permission.READ_EXTERNAL_STORAGE,
                    Manifest.permission.WRITE_EXTERNAL_STORAGE
            };

            for (String str : permissions) {
                mainActivity.requestPermissions(permissions, REQUEST_CODE_PERMISSION_STORAGE);
            }
        }
    }

    private static final int FILE_SELECT_CODEB = 1;

    // 打开文件选择器，选择文件
    void openselectFile(){
        Intent intent = new Intent(Intent.ACTION_GET_CONTENT);
        intent.setType("*/*");//设置类型
        intent.addCategory(Intent.CATEGORY_OPENABLE);
        try {
            mainActivity.startActivityForResult(Intent.createChooser(intent, "选择文件"),
                    FILE_SELECT_CODEB);
        } catch (android.content.ActivityNotFoundException ex) {
            Log.w("openselectFile","失败");
        }
    }

    // 读取选择文件的内容
    public void readFile(String path) throws IOException {
        String content = ""; //文件内容字符串
        //打开文件
        File file = new File(path);
        InputStream instream = new FileInputStream(file);
        if (instream != null)
        {
            InputStreamReader inputreader = new InputStreamReader(instream);
            BufferedReader buffreader = new BufferedReader(inputreader);
            Log.d( "readFile1: ",  buffreader.toString());
            String line;
            //分行读取
            while (( line = buffreader.readLine()) != null) {
                content += line;
            }
            instream.close();
        }
        // 最终结果
        Log.d( "readFile2: ",content);

    }

    // 在AppActivity中的onActivityResult调用该函数
    public void onActivityResult(int requestCode, int resultCode, Intent data){
        if (resultCode == Activity.RESULT_OK) {
            if (requestCode == 1) {
                if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT) {
                    //高于API19版本
                    String[] split = data.getData().getPath().split("\\:");
                    String p = "";
                    if (split.length >= 2) {
                        p = Environment.getExternalStorageDirectory() + "/" + split[1];
                        Log.d( "onActivityResult: ",p);

                        try {
                            SelectFile.getInstance().readFile(p);
                        } catch (IOException e) {
                            e.printStackTrace();
                        }

                        boolean mainthread = Looper.getMainLooper() == Looper.myLooper();
                        Log.d("onActivityResult",mainthread + "");

//                        new ReadFileTask().execute(p);
                    }
                } else {
                    //低于API19版本
                    Uri uri = data.getData();
                    Log.d("onActivityResult","文件路径" + uri.getPath());
                }
            }
        }
    }
}