Android文件选择器ExFilePicker的使用方法

compile 'ru.bartwell:exfilepicker:2.1'

package zhangfei.file;

import android.content.Intent;
import android.net.Uri;
import android.os.Environment;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.text.TextUtils;
import android.view.View;
import android.widget.Toast;

import java.io.File;
import java.util.List;

import ru.bartwell.exfilepicker.ExFilePicker;
import ru.bartwell.exfilepicker.data.ExFilePickerResult;

public class MainActivity extends AppCompatActivity {

 private AppCompatActivity mActivity;
 private final int EX_FILE_PICKER_RESULT = 0xfa01;
 private String startDirectory = null;// 记忆上一次访问的文件目录路径

 @Override
 protected void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  mActivity = this;
  setContentView(R.layout.activity_main);
  findViewById(R.id.choose).setOnClickListener(new View.OnClickListener() {
   @Override
   public void onClick(View view) {
    ExFilePicker exFilePicker = new ExFilePicker();
    exFilePicker.setCanChooseOnlyOneItem(true);// 单选
    exFilePicker.setQuitButtonEnabled(true);

    if (TextUtils.isEmpty(startDirectory)) {
     exFilePicker.setStartDirectory(Environment.getExternalStorageDirectory().getPath());
    } else {
     exFilePicker.setStartDirectory(startDirectory);
    }

    exFilePicker.setChoiceType(ExFilePicker.ChoiceType.FILES);
    exFilePicker.start(mActivity, EX_FILE_PICKER_RESULT);
   }
  });
 }

 @Override
 public void onActivityResult(int requestCode, int resultCode, Intent data) {
  if (requestCode == EX_FILE_PICKER_RESULT) {
   ExFilePickerResult result = ExFilePickerResult.getFromIntent(data);
   if (result != null && result.getCount() > 0) {
    String path = result.getPath();

    List names = result.getNames();
    for (int i = 0; i