android 手把手教你打造属于自己的文件浏览器

来源：互联网发布：淘宝女开衫编辑：程序博客网时间：2024/04/29 19:42

前言

相信很多朋友在项目开发中都需要用到选择文件浏览器，但是打开的的文件浏览器总有很多不是很满足的地方，比如说只显示特定的文件还有就是只选择文件夹的路径，这种需求相信在实际开发中还是会遇到很多的，在这里就需要我们自己根据File这个类和android的ListView来完成一个简单的文件浏览器，所以让我们来打造属于自己的文件浏览器吧

思路：

其实很简单的我们只需要根据获取到的手机的sd卡根目录来获取到每个目录的子目录，在每次点击的时候刷新ListView就可以了，现在让我们看下项目演示

这里写图片描述

现在让我们来实现主界面的逻辑

对于主界面，我们只需要重写他的onActivityResult方法，并且在点击按钮的时候对选择存储区域的一个选择逻辑就可以了，现在是代码

package com.browser.blue.filebrowser;import android.content.DialogInterface;import android.content.Intent;import android.os.Bundle;import android.support.v7.app.AlertDialog;import android.support.v7.app.AppCompatActivity;import android.util.Log;import android.view.View;import android.widget.Button;import android.widget.TextView;public class MainActivity extends AppCompatActivity {    private static final String TAG = MainActivity.class.getSimpleName() + "--->";    public static final int FILE_RESULT_CODE = 1;    private Button btn_open;    private TextView changePath;    @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();            }        });    }    private void openBrowser() {        new AlertDialog.Builder(this).setTitle("选择存储区域").setIcon(                R.drawable.icon_opnefile_browser).setSingleChoiceItems(                new String[]{"内置sd卡", "外部sd卡"}, 0,                new DialogInterface.OnClickListener() {                    public void onClick(DialogInterface dialog, int which) {                        Intent intent = new Intent(MainActivity.this, FileBrowserActivity.class);                        if (which == 0)                            intent.putExtra("area", false);                        else                            intent.putExtra("area", true);                        startActivityForResult(intent, FILE_RESULT_CODE);                        dialog.dismiss();                    }                }).setNegativeButton("取消", null).show();    }    @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");                Log.d(TAG, "onActivityResult: " + path);                changePath.setText("选择路径为 : " + path);            }        }    }}

可以看到我们在onActivityResult中获取到选择后的文件路径直接将它显示到TextView上面，下面就是文件浏览器的核心部分了

FileBrowserActivity.java 我们将它直接继承一个ListAcitivity，下面是整个代码

package com.browser.blue.filebrowser;import android.app.ListActivity;import android.content.Intent;import android.os.Bundle;import android.os.Environment;import android.support.annotation.Nullable;import android.util.Log;import android.view.View;import android.widget.ListView;import android.widget.TextView;import android.widget.Toast;import java.io.File;import java.util.ArrayList;import java.util.List;/** * Created by blue on 2016/10/23. */public class FileBrowserActivity extends ListActivity {    private static final String TAG = FileBrowserActivity.class.getSimpleName() + "--->";    private String rootPath;    private boolean pathFlag;    private List<String> pathList;    private List<String> itemsList;    private TextView curPathTextView;    @Override    protected void onCreate(@Nullable Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_file_browser_acitivity);        initView();        initInfo();    }    private void initInfo() {        pathFlag = getIntent().getBooleanExtra("area", false);        rootPath = getRootPath();        if (rootPath == null) {            Toast.makeText(this, "所选SD卡为空！", Toast.LENGTH_SHORT).show();            finish();        } else {            getFileDir(rootPath);        }    }    private void initView() {        curPathTextView = (TextView) findViewById(R.id.curPath);    }    private void getFileDir(String filePath) {        curPathTextView.setText(filePath);        itemsList = new ArrayList<>();        pathList = new ArrayList<>();        File file = new File(filePath);        File[] files = file.listFiles();        if (!filePath.equals(rootPath)) {            itemsList.add("b1");            pathList.add(rootPath);            itemsList.add("b2");            pathList.add(file.getParent());        }        if (files == null) {            Toast.makeText(this, "所选SD卡为空！", Toast.LENGTH_SHORT).show();            finish();            return;        }        for (int i = 0; i < files.length; i++) {            File f = files[i];           /**这里取消注释 就能显示到指定的文件了*/           // if (checkSpecificFile(f)) {                itemsList.add(f.getName());                pathList.add(f.getPath());         //   }        }        setListAdapter(new MyAdapter(this, itemsList, pathList));    }    public boolean checkSpecificFile(File file) {        String fileNameString = file.getName();        String endNameString = fileNameString.substring(                fileNameString.lastIndexOf(".") + 1, fileNameString.length())                .toLowerCase();        Log.d(TAG, "checkShapeFile: " + endNameString);        if (file.isDirectory()) {            return true;        }        /**甚至需要显示的特定文件后缀*/        if (endNameString.equals("txt")) {            return true;        } else {            return false;        }    }    private String getRootPath() {        try {            String rootPath;                if (pathFlag) {                    Log.d(TAG, "getRootPath: 正在获取内置SD卡根目录");                    rootPath = Environment.getExternalStorageDirectory()                            .toString();                    Log.d(TAG, "getRootPath: 内置SD卡目录为:" + rootPath);                    return rootPath;                } else {                    rootPath = System.getenv("SECONDARY_STORAGE");                    if ((rootPath.equals(Environment.getExternalStorageDirectory().toString())))                        rootPath = null;                    Log.d(TAG, "getRootPath:  外置SD卡路径为：" + rootPath);                    return rootPath;            }        } catch (Exception e) {            return null;        }    }    @Override    protected void onListItemClick(ListView l, View v, int position, long id) {        File file = new File(pathList.get(position));        if (file.isDirectory()) {            getFileDir(file.getPath());        } else {            Intent data = new Intent(FileBrowserActivity.this, MainActivity.class);            Bundle bundle = new Bundle();            bundle.putString("file", file.getPath());            data.putExtras(bundle);            setResult(2, data);            finish();        }    }    public boolean checkSDcard() {        String sdStutusString = Environment.getExternalStorageState();        if (sdStutusString.equals(Environment.MEDIA_MOUNTED)) {            return true;        } else {            return false;        }    }}

然后就是ListView的adapter了，对于adapter其实与平时的adapter都差不多

package com.browser.blue.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.BaseAdapter;import android.widget.ImageView;import android.widget.TextView;import java.io.File;import java.util.List;public class MyAdapter extends BaseAdapter {    private LayoutInflater mInflater;    private Bitmap mIcon1;    private Bitmap mIcon2;    private Bitmap mIcon3;    private Bitmap mIcon4;    private List<String> items;    private List<String> paths;    public MyAdapter(Context context, List<String> it, List<String> pa) {        mInflater = LayoutInflater.from(context);        items = it;        paths = pa;        mIcon1 = BitmapFactory.decodeResource(context.getResources(), R.drawable.icon_back);        mIcon2 = BitmapFactory.decodeResource(context.getResources(), R.drawable.icon_back02);        mIcon3 = BitmapFactory.decodeResource(context.getResources(), R.drawable.icon_fodler);        mIcon4 = BitmapFactory.decodeResource(context.getResources(), R.drawable.icon_file);    }    public int getCount() {        return items.size();    }    public Object getItem(int position) {        return items.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 f = new File(paths.get(position).toString());        if (items.get(position).toString().equals("b1")) {            holder.text.setText("返回根目录..");            holder.icon.setImageBitmap(mIcon1);        } else if (items.get(position).toString().equals("b2")) {            holder.text.setText("返回上一层..");            holder.icon.setImageBitmap(mIcon2);        } else {            holder.text.setText(f.getName());            if (f.isDirectory()) {                holder.icon.setImageBitmap(mIcon3);            } else {                holder.icon.setImageBitmap(mIcon4);            }        }        return convertView;    }    private class ViewHolder {        TextView text;        ImageView icon;    }}

布局文件就不一一展示了，只展示下 FileBrowserAcitivty的布局吧

<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:layout_width="match_parent"    android:layout_height="match_parent"    android:orientation="vertical">    <TextView        android:id="@+id/curPath"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:padding="5dp"        android:textSize="18sp">    </TextView>    <ListView        android:id="@android:id/list"        android:layout_width="fill_parent"        android:layout_height="match_parent">    </ListView></LinearLayout>

对于这个文件浏览器其实也是很简单的，需要源码的同学请到我的github下载

自定义文件浏览器点击进入

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