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。
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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：
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<?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
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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; } } } |
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<?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
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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
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<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。
以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持服务器之家。
原文链接：https://blog.csdn.net/qq_16064871/article/details/81838720
