Android 系统文件浏览器

1.调用系统文件浏览器

Intent intent = new Intent(Intent.ACTION_GET_CONTENT);
intent.setType("*/*");//设置类型，我这里是任意类型，任意后缀的可以这样写。
//intent.setType(“image/*”);//选择图片
 
//intent.setType(“audio/*”); //选择音频
 
//intent.setType(“video/*”); //选择视频 (mp4 3gp 是android支持的视频格式)
 
//intent.setType(“video/*;image/*”);//同时选择视频和图片
 
intent.addCategory(Intent.CATEGORY_OPENABLE);
startActivityForResult(intent, 1000);

2.接受选中回调

@Override
protected void onActivityResult(int requestCode, int resultCode, @Nullable Intent data) {
    super.onActivityResult(requestCode, resultCode, data);
    try {
        if (resultCode == Activity.RESULT_OK && requestCode == 1000) {
            Uri uri = data.getData();//得到uri，后面就是将uri转化成file的过程。
            String absolutePath = FileChooseUtil.uriToPath(this, uri);
            Log.e("选择了文件", "文件路径：" + absolutePath);
            readExcel(absolutePath);
        }
    } catch (Exception e) {
        e.printStackTrace();
    }
 
}

3.Uri转绝对路径

package com.example.exportfile;
 
import android.annotation.SuppressLint;
import android.content.ContentUris;
import android.content.Context;
import android.database.Cursor;
import android.net.Uri;
import android.os.Build;
import android.os.Environment;
import android.provider.DocumentsContract;
import android.provider.MediaStore;
import android.widget.Toast;
 
public class FileChooseUtil {
    private static Context context;
    private static FileChooseUtil util = null;
 
    private FileChooseUtil(Context context) {
        this.context = context;
    }
 
    public static FileChooseUtil getInstance(Context context) {
        if (util == null) {
            util = new FileChooseUtil(context);
        }
        return util;
    }
 
    /**
     * 对外接口  获取uri对应的路径
     *
     * @param uri
     * @return
     */
    public String getChooseFileResultPath(Uri uri) {
        String chooseFilePath = null;
        if ("file".equalsIgnoreCase(uri.getScheme())) {//使用第三方应用打开
            chooseFilePath = uri.getPath();
            Toast.makeText(context, chooseFilePath, Toast.LENGTH_SHORT).show();
            return chooseFilePath;
        }
        if (Build.VERSION.SDK_INT > Build.VERSION_CODES.KITKAT) {//4.4以后
            chooseFilePath = getPath(context, uri);
        } else {//4.4以下下系统调用方法
            chooseFilePath = getRealPathFromURI(uri);
        }
        return chooseFilePath;
    }
 
    public static String getRealPathFromURI(Uri contentUri) {
        String res = null;
        String[] proj = {MediaStore.Images.Media.DATA};
        Cursor cursor = context.getContentResolver().query(contentUri, proj, null, null, null);
        if (null != cursor && cursor.moveToFirst()) {
            int column_index = cursor.getColumnIndexOrThrow(MediaStore.Images.Media.DATA);
            res = cursor.getString(column_index);
            cursor.close();
        }
        return res;
    }
 
    public static String uriToPath(Context context, Uri uri) {
        if (Build.VERSION.SDK_INT > Build.VERSION_CODES.KITKAT) {//4.4以后
            return FileChooseUtil.getPath(context, uri);
        } else {//4.4以下下系统调用方法
            return FileChooseUtil.getRealPathFromURI(uri);
        }
    }
 
 
    /**
     * 专为Android4.4设计的从Uri获取文件绝对路径，以前的方法已不好使
     */
    @SuppressLint("NewApi")
    public static String getPath(final Context context, final Uri uri) {
 
        final boolean isKitKat = Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT;
 
        // DocumentProvider
        if (isKitKat && DocumentsContract.isDocumentUri(context, uri)) {
            // ExternalStorageProvider
            if (isExternalStorageDocument(uri)) {
                final String docId = DocumentsContract.getDocumentId(uri);
                final String[] split = docId.split(":");
                final String type = split[0];
 
                if ("primary".equalsIgnoreCase(type)) {
                    return Environment.getExternalStorageDirectory() + "/" + split[1];
 
                }
            }
            // DownloadsProvider
            else if (isDownloadsDocument(uri)) {
                final String id = DocumentsContract.getDocumentId(uri);
                final Uri contentUri = ContentUris.withAppendedId(Uri.parse("content://downloads/public_downloads"), Long.valueOf(id));
                return getDataColumn(context, contentUri, null, null);
 
            }
            // MediaProvider
            else if (isMediaDocument(uri)) {
                final String docId = DocumentsContract.getDocumentId(uri);
                final String[] split = docId.split(":");
                final String type = split[0];
 
                Uri contentUri = null;
                if ("image".equals(type)) {
                    contentUri = MediaStore.Images.Media.EXTERNAL_CONTENT_URI;
 
                } else if ("video".equals(type)) {
                    contentUri = MediaStore.Video.Media.EXTERNAL_CONTENT_URI;
 
                } else if ("audio".equals(type)) {
                    contentUri = MediaStore.Audio.Media.EXTERNAL_CONTENT_URI;
 
                }else if ("document".equals(type)) {
                    contentUri = MediaStore.Files.getContentUri("external");
                }
 
                final String selection = "_id=?";
                final String[] selectionArgs = new String[]{split[1]};
 
                return getDataColumn(context, contentUri, selection, selectionArgs);
 
            }
 
        }
        // MediaStore (and general)
        else if ("content".equalsIgnoreCase(uri.getScheme())) {
            return getDataColumn(context, uri, null, null);
 
        }
        // File
        else if ("file".equalsIgnoreCase(uri.getScheme())) {
            uri.getPath();
 
        }
        return null;
    }
 
    private static String getDataColumn(Context context, Uri uri, String selection, String[] selectionArgs) {
        Cursor cursor = null;
        final String column = "_data";
        final String[] projection = {column};
        try {
            cursor = context.getContentResolver().query(uri, projection, selection, selectionArgs,
                    null);
            if (cursor != null && cursor.moveToFirst()) {
                final int column_index = cursor.getColumnIndexOrThrow(column);
                return cursor.getString(column_index);
            }
        } finally {
            if (cursor != null)
                cursor.close();
        }
        return null;
    }
 
    /**
     * @param uri The Uri to check.
     * @return Whether the Uri authority is ExternalStorageProvider.
     */
    private static boolean isExternalStorageDocument(Uri uri) {
        return "com.android.externalstorage.documents".equals(uri.getAuthority());
    }
 
    /**
     * @param uri The Uri to check.
     * @return Whether the Uri authority is DownloadsProvider.
     */
    private static boolean isDownloadsDocument(Uri uri) {
        return "com.android.providers.downloads.documents".equals(uri.getAuthority());
    }
 
    /**
     * @param uri The Uri to check.
     * @return Whether the Uri authority is MediaProvider.
     */
    private static boolean isMediaDocument(Uri uri) {
        return "com.android.providers.media.documents".equals(uri.getAuthority());
    }
}