Android自定义文件路径选择器

文中涉及到文件名称排序，固定根目录以及返回上一层在上面，方便选择等。根据文件后缀，筛选文件还没做。先看效果。

1、效果图

2、核心代码如下

是通过继承BaseAdapter 完成的，里面有自定义layout界面。进行管理返回跟目录以及上一层，方便管理。

package com.filebrowser;

import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AdapterView;
import android.widget.BaseAdapter;
import android.widget.ImageView;
import android.widget.ListView;
import android.widget.TextView;

import java.io.File;
import java.io.FileFilter;
import java.util.Arrays;
import java.util.Collections;
import java.util.Comparator;
import java.util.List;

public class MyAdapter extends BaseAdapter implements View.OnClickListener, AdapterView.OnItemClickListener {
  private String rootPath;
  private LayoutInflater mInflater;
  private Bitmap mIcon3;
  private Bitmap mIcon4;
  private List<File> fileList;
  private View header;
  private View layoutReturnRoot;
  private View layoutReturnPre;
  private TextView curPathTextView;
  private String suffix = "";
  private String currentDirPath;
  private FileSelectListener listener;

  public MyAdapter(View fileSelectListView, String rootPath, String defaultPath) {
    this.rootPath = rootPath;
    Context context = fileSelectListView.getContext();
    mInflater = LayoutInflater.from(context);
    mIcon3 = BitmapFactory.decodeResource(context.getResources(), R.drawable.icon_fodler);
    mIcon4 = BitmapFactory.decodeResource(context.getResources(), R.drawable.icon_file);

    curPathTextView = (TextView) fileSelectListView.findViewById(R.id.curPath);
    header = fileSelectListView.findViewById(R.id.layoutFileListHeader);
    layoutReturnRoot = fileSelectListView.findViewById(R.id.layoutReturnRoot);
    layoutReturnPre = fileSelectListView.findViewById(R.id.layoutReturnPre);
    layoutReturnRoot.setOnClickListener(this);
    layoutReturnPre.setOnClickListener(this);
    if (defaultPath != null && !defaultPath.isEmpty()) {
      getFileDir(defaultPath);
    } else {
      getFileDir(rootPath);
    }
    ListView listView = (ListView) fileSelectListView.findViewById(R.id.list);
    listView.setAdapter(this);
    listView.setOnItemClickListener(this);
  }

  private class ViewHolder {
    TextView text;
    ImageView icon;
  }

  public interface FileSelectListener {
    void onFileSelect(File selectedFile);

    void onDirSelect(File selectedDir);
  }

  public void setOnFileSelectListener(FileSelectListener listener) {
    this.listener = listener;
  }

  /**
   * 获取所选文件路径下的所有文件，并且更新到listview中
   */
  private void getFileDir(String filePath) {
    File file = new File(filePath);
    File[] files = file.listFiles(new FileFilter() {
      @Override
      public boolean accept(File pathname) {
        if (pathname.isFile()&&!suffix.isEmpty()){
          return pathname.getName().endsWith(suffix);
        }
        return true;
      }
    });
    fileList = Arrays.asList(files);
    //按名称排序
    Collections.sort(fileList, new Comparator<File>() {
      @Override
      public int compare(File o1, File o2) {
        if (o1.isFile() && o2.isDirectory())
          return 1;
        if (o1.isDirectory() && o2.isFile())
          return -1;
        return o1.getName().compareTo(o2.getName());
      }
    });

    if (header != null) {
      header.setVisibility(filePath.equals(rootPath) ? View.GONE : View.VISIBLE);
    }

    notifyDataSetChanged();

    if (curPathTextView != null) {
      curPathTextView.setText(filePath);
    }
    currentDirPath = filePath;

    if (listener!=null){
      listener.onDirSelect(file);
    }
  }

  public int getCount() {
    return fileList.size();
  }

  public Object getItem(int position) {
    return fileList.get(position);
  }

  public long getItemId(int position) {
    return position;
  }

  public View getView(int position, View convertView, ViewGroup parent) {
    ViewHolder holder;
    if (convertView == null) {
      convertView = mInflater.inflate(R.layout.file_item, null);
      holder = new ViewHolder();
      holder.text = (TextView) convertView.findViewById(R.id.text);
      holder.icon = (ImageView) convertView.findViewById(R.id.icon);
      convertView.setTag(holder);
    } else {
      holder = (ViewHolder) convertView.getTag();
    }

    File file = fileList.get(position);
    holder.text.setText(file.getName());
    if (file.isDirectory()) {
      holder.icon.setImageBitmap(mIcon3);
    } else {
      holder.icon.setImageBitmap(mIcon4);
    }
    return convertView;
  }

  @Override
  public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
    File file = fileList.get(position);
    if (file.isDirectory()) {
      getFileDir(file.getPath());
    } else {
      if (listener!=null){
        listener.onFileSelect(file);
      }
    }
  }

  @Override
  public void onClick(View v) {
    if (v.getId() == R.id.layoutReturnRoot) {
      getFileDir(rootPath);
    } else if (v.getId() == R.id.layoutReturnPre) {
      getFileDir(new File(currentDirPath).getParent());
    }
  }
}

使用的布局如下：

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
  android:layout_width="match_parent"
  android:background="@color/white"
  android:layout_height="wrap_content">

  <LinearLayout
    android:id="@+id/layoutFileSelectList"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:layout_marginTop="10dp"
    android:orientation="vertical"
    android:showDividers="middle|end">

    <TextView
      android:id="@+id/curPath"
      android:layout_width="wrap_content"
      android:layout_height="wrap_content"
      android:layout_marginBottom="6dp"
      android:paddingLeft="10dp"
      android:textSize="16sp" />

    <LinearLayout
      android:id="@+id/layoutFileListHeader"
      android:layout_width="match_parent"
      android:layout_height="wrap_content"
      android:divider="@drawable/shape_divider_line"
      android:showDividers="beginning|middle|end"
      android:orientation="vertical">

      <LinearLayout
        android:id="@+id/layoutReturnRoot"
        android:layout_width="match_parent"
        android:layout_height="50dp"
        android:paddingLeft="10dp"
        android:gravity="center"
        android:orientation="horizontal">

        <ImageView
          android:id="@+id/iv_return_root"
          android:layout_width="30dp"
          android:layout_height="30dp"
          android:background="@drawable/icon_back">

        </ImageView>

        <TextView
          android:id="@+id/tv_return_root"
          android:layout_width="0dp"
          android:layout_height="match_parent"
          android:layout_weight="1"
          android:gravity="center_vertical"
          android:paddingLeft="10dp"
          android:text="@string/ReturnRootDir"
          android:textSize="16sp">

        </TextView>

      </LinearLayout>

      <LinearLayout
        android:id="@+id/layoutReturnPre"
        android:layout_width="match_parent"
        android:layout_height="50dp"
        android:paddingLeft="10dp"
        android:gravity="center"
        android:orientation="horizontal">

        <ImageView
          android:id="@+id/iv_return_pre"
          android:layout_width="30dp"
          android:layout_height="30dp"
          android:background="@drawable/icon_back02">

        </ImageView>

        <TextView
          android:id="@+id/tv_return_pre"
          android:layout_width="0dp"
          android:layout_height="match_parent"
          android:layout_weight="1"
          android:gravity="center_vertical"
          android:paddingLeft="10dp"
          android:text="@string/ReturnPreDir"
          android:textSize="16sp">

        </TextView>

      </LinearLayout>

    </LinearLayout>

    <ListView
      android:id="@+id/list"
      android:layout_width="match_parent"
      android:layout_height="match_parent">

    </ListView>

  </LinearLayout>

</LinearLayout>

调用方式

package com.filebrowser;

import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.widget.TextView;
import java.io.File;

public class FileBrowserActivity extends Activity implements
    View.OnClickListener, MyAdapter.FileSelectListener {
  private TextView curPathTextView;
  private String rootPath = "";
  private MyAdapter listAdapter;
  //初始化进入的目录，默认目录
  private String filePath = "";

  protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_file_browser_acitivity);
    initView();

    //跟目录
    rootPath = getIntent().getStringExtra("rootPath");
    //指定文件夹
    filePath = getIntent().getStringExtra("path");

    curPathTextView.setText(filePath);
    filePath = filePath.isEmpty() ? rootPath : filePath;
    View layoutFileSelectList = findViewById(R.id.layoutFileSelectList);
    listAdapter = new MyAdapter(layoutFileSelectList, rootPath, filePath);
    listAdapter.setOnFileSelectListener(this);

    findViewById(R.id.btnSure).setOnClickListener(this);
    findViewById(R.id.btnCancel).setOnClickListener(this);
  }

  @Override
  public void finish() {
    Intent intent = new Intent();
    intent.putExtra("file", filePath);
    setResult(RESULT_OK, intent);
    super.finish();
  }

  private void initView() {
    curPathTextView = (TextView) findViewById(R.id.curPath);
  }

  @Override
  public void onFileSelect(File selectedFile) {
    filePath = selectedFile.getPath();
  }

  @Override
  public void onDirSelect(File selectedDir) {
    filePath = selectedDir.getPath();
  }

  @Override
  public void onClick(View v) {
    switch (v.getId()){
      case R.id.btnSure:
        finish();
        break;
      case R.id.btnCancel:
        filePath ="";
        finish();
        break;

      default:
        break;

    }
  }

}

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
  android:id="@+id/layoutProgramManagerMainView"
  android:layout_width="match_parent"
  android:layout_height="match_parent"
  android:focusable="true"
  android:focusableInTouchMode="true"
  android:orientation="vertical">

  <include
    android:layout_weight="1"
    android:layout_width="match_parent"
    android:layout_height="0dp"
    layout="@layout/layout_file_select_list"/>
  <LinearLayout
    android:layout_width="match_parent"
    android:layout_height="50dp"
    android:layout_gravity="bottom"
    android:layout_weight="0"
    android:orientation="vertical"
    android:showDividers="beginning">

    <LinearLayout
      android:layout_width="match_parent"
      android:layout_height="match_parent"
      android:gravity="center"
      android:orientation="horizontal">

      <Button
        android:id="@+id/btnCancel"
        android:layout_width="0dp"
        android:layout_height="40dp"
        android:layout_weight="1"
        android:text="@string/cancel"
        android:textSize="16sp" />
      <Button
        android:id="@+id/btnSure"
        android:layout_width="0dp"
        android:layout_height="40dp"
        android:layout_weight="1"
        android:text="@string/sure"
        android:textSize="16sp" />

    </LinearLayout>
  </LinearLayout>

</LinearLayout>

返回选择的目录

package com.filebrowser;

import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.os.Environment;
import android.os.storage.StorageManager;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.util.Locale;

public class MainActivity extends Activity {
  public static final int FILE_RESULT_CODE = 1;
  private Button btn_open;
  private TextView changePath;
  private String rootPath;

  @Override
  protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    initView();
    initListener();
  }

  private void initView() {
    btn_open = (Button) findViewById(R.id.btn_open);
    changePath = (TextView) findViewById(R.id.changePath);
  }

  private void initListener() {
    btn_open.setOnClickListener(new View.OnClickListener() {
      @Override
      public void onClick(View view) {
        openBrowser();
      }
    });

    findViewById(R.id.btn_open1).setOnClickListener(new View.OnClickListener() {
      @Override
      public void onClick(View v) {
        openBrowser1();
      }
    });
  }

  private void openBrowser() {
    rootPath = System.getenv("SECONDARY_STORAGE");
    if (rootPath == null) {
      rootPath = Environment.getExternalStorageDirectory().toString();
    }
    if ((rootPath.equals(Environment.getExternalStorageDirectory().toString()))) {
      String filePath = rootPath + "/Android";
      Intent intent = new Intent(MainActivity.this, FileBrowserActivity.class);
      //根目录
      intent.putExtra("rootPath", rootPath);
      //进去指定文件夹
      intent.putExtra("path", filePath);
      startActivityForResult(intent, FILE_RESULT_CODE);
    }
  }

  private void openBrowser1() {
    rootPath = getSdcardPath();
    if (rootPath == null || rootPath.isEmpty()) {
      rootPath = Environment.getExternalStorageDirectory().toString();
    }
    Intent intent = new Intent(MainActivity.this, FileBrowserActivity.class);
    intent.putExtra("rootPath", rootPath);
    intent.putExtra("path", rootPath);
    startActivityForResult(intent, FILE_RESULT_CODE);
  }

  public String getSdcardPath() {
    String sdcardPath = "";
    String[] pathArr = null;
    StorageManager storageManager = (StorageManager) getSystemService(STORAGE_SERVICE);
    try {
      Method getVolumePaths = storageManager.getClass().getMethod("getVolumePaths");
      pathArr = (String[]) getVolumePaths.invoke(storageManager);
    } catch (NoSuchMethodException e) {
      e.printStackTrace();
    } catch (InvocationTargetException e) {
      e.printStackTrace();
    } catch (IllegalAccessException e) {
      e.printStackTrace();
    }
    if (pathArr != null && pathArr.length >= 3) {
      sdcardPath = pathArr[1];
    }
    return sdcardPath;
  }

  @Override
  protected void onActivityResult(int requestCode, int resultCode, Intent data) {
    if (FILE_RESULT_CODE == requestCode) {
      Bundle bundle = null;
      if (data != null && (bundle = data.getExtras()) != null) {
        String path = bundle.getString("file","");
        if(!path.isEmpty()){
          changePath.setText("选择路径为 : " + path);
        }
      }
    }
  }
}

3、最后肯定是权限

<uses-permission android:name="android.permission.MOUNT_UNMOUNT_FILESYSTEMS" />
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />

其实后面可以封装成一个自定义的view 进行继承LinearLayout进行封装即可。

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