进入系统文件夹代码:
Intent intent = new Intent(Intent.ACTION_OPEN_DOCUMENT);
intent.addCategory(Intent.CATEGORY_OPENABLE);
intent.addFlags(Intent.FLAG_GRANT_READ_URI_PERMISSION);
/** fileType是一个字符串,用来筛选文件类型 */
/** "image/*" 图片 */
/** "video/*" 视频 */
/** "audio/*" 音频 */
/** "*/*" 无筛选 */
intent.setType(fileType);
startActivityForResult(intent, READ_REQUEST_CODE);
然后在Activity的onActivityResult()方法中接收返回的数据。
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
switch (requestCode) {
case READ_REQUEST_CODE:
if (data != null && resultCode == RESULT_OK) {
Uri uri = data.getData();
String path = FileUtil.getPath(HomeActivity.this, uri);
}
break;
}
}
主要的处理在FileUtil这个类里面。在Android4.4后获取的Uri是特殊的格式,所以需要分情况来处理。
package cn.droidlover.xdroidmvp.demo.util;
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.os.SystemClock;
import android.provider.DocumentsContract;
import android.provider.MediaStore;
import android.support.v4.content.CursorLoader;
import android.support.v4.content.FileProvider;
import android.text.TextUtils;
import androidx.annotation.RequiresApi;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.text.DecimalFormat;
import java.util.List;
import java.util.Objects;
import cn.droidlover.xdroidmvp.demo.BuildConfig;
public class FileUtil {
public static String readFileSize(String path) {
return readableFileSize(new File(path).length());
}
public static String readableFileSize(long size) {
if (size <= 0)
return "0";
final String[] units = new String[]{"B", "KB", "MB", "GB", "TB"};
int digitGroups = (int) (Math.log10(size) / Math.log10(1024));
return new DecimalFormat("#,##0.#").format(size / Math.pow(1024, digitGroups)) + " " + units[digitGroups];
}
/**
* file --> uri
*
* @param context
* @param file
* @return
*/
public static Uri getUriFromFile(Context context, File file) {
if (context == null || file == null) {
throw new NullPointerException();
}
Uri uri;
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.N) {
uri = FileProvider.getUriForFile(context.getApplicationContext(), BuildConfig.APPLICATION_ID + ".fileprovider", file);
} else {
uri = Uri.fromFile(file);
}
return 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
*/
@RequiresApi(api = Build.VERSION_CODES.KITKAT)
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
//一些三方的文件浏览器会进入到这个方法中,例如ES
//QQ文件管理器不在此列
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);
if (!TextUtils.isEmpty(id)) {
if (id.startsWith("raw:")) {
return id.replaceFirst("raw:", "");
} else if (id.contains("msf:")) {
return getMSFFile(uri, id, context);
} else {
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 = getDocumentId(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);
}
} else if ("content".equalsIgnoreCase(uri.getScheme())) {// MediaStore (and general)
// Return the remote address
if (isGooglePhotosUri(uri))
return uri.getLastPathSegment();
if (isQQMediaDocument(uri)) {
String path = uri.getPath();
File fileDir = Environment.getExternalStorageDirectory();
File file = new File(fileDir, path.substring("/QQBrowser".length(), path.length()));
return file.exists() ? file.toString() : null;
}
return getDataColumn(context, uri, null, null);
} else if ("file".equalsIgnoreCase(uri.getScheme())) {// File
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 = MediaStore.MediaColumns.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);
Logger.getInstence().e(cursor.getString(column_index) + column_index);
return cursor.getString(column_index);
}
} finally {
if (cursor != null)
cursor.close();
}
return null;
}
public static String getRealPathFromURI(Context context, Uri contentUri) {
return getDataColumn(context, contentUri, null, 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());
}
/**
* 使用第三方qq文件管理器打开
*
* @param uri
* @return
*/
public static boolean isQQMediaDocument(Uri uri) {
return "com.tencent.mtt.fileprovider".equals(uri.getAuthority());
}
/**
* @param uri The Uri to check.
* @return Whether the Uri authority is Google Photos.
*/
public static boolean isGooglePhotosUri(Uri uri) {
return "com.google.android.apps.photos.content".equals(uri.getAuthority());
}
public static String getAbsoluteImagePath(Context context, Uri uri) {
String[] proj = {MediaStore.Images.Media.DATA};
CursorLoader loader = new CursorLoader(context, uri, proj, null, null, null);
Cursor cursor = loader.loadInBackground();
int column_index = cursor.getColumnIndexOrThrow(MediaStore.Images.Media.DATA);
cursor.moveToFirst();
return cursor.getString(column_index);
}
public static String getMSFFile(Uri uri, String id, Context context) {
if (id != null && id.startsWith("msf:")) {
File dir = new File(context.getCacheDir().getAbsolutePath());
if (!dir.exists()) {
dir.mkdirs();
}
final File file = new File(dir, SystemClock.uptimeMillis() + "." + Objects.requireNonNull(context.getContentResolver().getType(uri)).split("/")[1]);
Logger.getInstence().e("path : " + file.getAbsolutePath());
try (
final InputStream inputStream = context.getContentResolver().openInputStream(uri);
OutputStream output = new FileOutputStream(file)) {
final byte[] buffer = new byte[4 * 1024]; // or other buffer size
int read;
while ((read = inputStream.read(buffer)) != -1) {
output.write(buffer, 0, read);
}
output.flush();
output.close();
return file.getPath();
} catch (IOException ex) {
ex.printStackTrace();
Logger.getInstence().e(ex.getMessage());
}
}
return null;
}
private static void deleteTempFile(Context context) {
final File[] files = context.getCacheDir().listFiles();
if (files != null) {
for (final File file : files) {
file.delete();
}
}
}
}
其中主要是在下图所示做了判断,根据不同的情况获取文件地址。如果获取的Uri链接里面是以(msf:数字)结尾的,则是通过把文件复制出一个缓存文件再获取缓存文件的链接。在使用完后需要删除缓存的这个文件,方法是FileUtil里面的deleteTemoFile。
以上是记录一次使用过程中的问题,可能有不足或者更好的方法,欢迎留言,谢谢。