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。
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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 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() {
@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"?>
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"?>
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
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创新互联。
文章标题：Android自定义文件路径选择器
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