职场小白迷上优美句子:
推迟，拖延真的是件可怕的事，过去了好久还是原来的样子。
公司现在的项目中有一个需求，需要把本地 json 格式的数据导入到项目中使用，其实简单的逻辑就是：使用安卓隐式跳转的方式进入到文件管理器，然后寻找需要的文件，点击文件之后返回该文件的路径，之后根据路径获取到该文件并对其进行相应的操作。
这些代码不是自己在Android 官网上找的，也是从百度搜的，当然需要标明出处：
Android调用系统自带的文件管理器，打开指定路径_android file 内置文件到机器特定路径_沧海龙腾LV的博客-CSDN博客
1.进入文件管理器
private void intoFileManager() { Intent intent = new Intent(Intent.ACTION_GET_CONTENT); intent.setType("*/*");//无类型限制 // 有类型限制是这样的: // 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, 1); }
2.返回结果
String path; @Override protected void onActivityResult(int requestCode, int resultCode, @Nullable Intent data) { super.onActivityResult(requestCode, resultCode, data); if (resultCode == Activity.RESULT_OK) { Uri uri = data.getData(); if ("file".equalsIgnoreCase(uri.getScheme())){//使用第三方应用打开 path = uri.getPath(); mFilePathTv.setText(path); Log.d("queryfilepath", "返回结果1: " + path); return; } if (Build.VERSION.SDK_INT > Build.VERSION_CODES.KITKAT) {//4.4以后 path = FileChooseUtil.getPath(this, uri); mFilePathTv.setText(path); Log.d("queryfilepath", "返回结果2: " + path); } else {//4.4以下下系统调用方法 path = FileChooseUtil.getRealPathFromURI(uri); mFilePathTv.setText(path); Log.d("queryfilepath", "返回结果3: " + path); } } }
3.用到的工具类
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; } /** * 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; } 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()); } }
注意：记得开启手机的读写权限，不然会报权限拒绝异常：SecurityException ！ ! !
