参考转载自： www.jianshu.com/p/df60c12d2…
ANdroid 从文件管理器读取文件：
跳转进入系统文件管理器
final String DOC = "application/msword";
final String XLS = "application/vnd.ms-excel";
final String PPT = "application/vnd.ms-powerpoint";
final String DOCX = "application/vnd.openxmlformats-officedocument.wordprocessingml.document";
final String XLS1 = "application/x-excel";
final String XLSX = "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet";
final String PPTX = "application/vnd.openxmlformats-officedocument.presentationml.presentation";
final String PDF = "application/pdf";
final String TXT = "application/txt";
Intent intent = new Intent(Intent.ACTION_GET_CONTENT);
//设置类型，我这里是任意类型，任意后缀的可以这样写。
intent.addCategory(Intent.CATEGORY_OPENABLE);
String[] mimeTypes = {DOC, DOCX, PDF, PPT, PPTX, XLS, XLS1, XLSX,TXT};
intent.setType("*/*");
intent.putExtra(Intent.EXTRA_MIME_TYPES, mimeTypes);
activity.startActivityForResult(intent, Constants.REQUEST_SELECT_FILE);
返回结果:
if (resultCode == PTBaseActivity.RESULT_OK) {
if (requestCode == Constants.REQUEST_SELECT_FILE) {
//选择文件
//得到uri，后面就是将uri转化成file的过程。
Uri uri = data.getData();
String path;
if (Build.VERSION.SDK_INT > Build.VERSION_CODES.KITKAT) {
//4.4以后
path = FileUtils.getPath(getAppBaseApplication(), uri);
} else {//4.4以下下系统调用方法
path = FileUtils.getRealPathFromURI(uri);
}
File file = new File(path);
}
}
||
//<editor-fold desc="【根据 uri读取文件路径】">
/**
* 根据 uri读取文件路径
* Android 4.4之前
*
* @param contentUri
* @return
*/
public static String getRealPathFromURI(Uri contentUri) {
String res = null;
String[] proj = {MediaStore.Images.Media.DATA};
Cursor cursor = BaseApplication.getAppContext().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以后设计的从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())) {
return uri.getPath();
}
return null;
}
/**
* Get the value of the data column for this Uri. This is useful for
* MediaStore Uris, and other file-based ContentProviders.
*
* @param context The context.
* @param uri The Uri to query.
* @param selection (Optional) Filter used in the query.
* @param selectionArgs (Optional) Selection arguments used in the query.
* @return The value of the _data column, which is typically a file path.
*/
public 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.
*/
public 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.
*/
public 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.
*/
public static boolean isMediaDocument(Uri uri) {
return "com.android.providers.media.documents".equals(uri.getAuthority());
}
//</editor-fold desc="【根据 uri读取文件路径】">
//由于7.0的升级还需要在AndroidManifest.xml中配置FileProvider
<provider
android:name="android.support.v4.content.FileProvider"
android:authorities="${applicationId}.fileprovider"
android:exported="false"
android:grantUriPermissions="true">
<meta-data
android:name="android.support.FILE_PROVIDER_PATHS"
android:resource="@xml/file_paths" />
</provider>
//xml/file_paths 文件:
<!--物理路径相当于Context.getFilesDir() + /path/-->
<files-path name="name" path="path" />
<!--物理路径相当于Context.getCacheDir() + /path/-->
<cache-path name="name" path="path" />
<!-- 物理路径相当于Environment.getExternalStorageDirectory() + /path/-->
<external-path name="name" path="path" />
<!-- 物理路径相当于Context.getExternalFilesDir(String) + /path/-->
<external-files-path name="name" path="path" />
<!-- 物理路径相当于Context.getExternalCacheDir() + /path/-->
<external-cache-path name="name" path="path" />
${applicationId}.fileprovider这个配置要记牢，后期遇到大坑就靠这个值了。
