关于Android获取本地音频的坑
下面是我以前的做法
private void findLocalAudio(Intent data) {
Uri uri = data.getData();
String[] projection = {MediaStore.Audio.Media.DATA};
Cursor myCursor = this.getContentResolver().query(uri, projection, null, null, null);
int chooseIndex;
if (myCursor != null) {
myCursor.moveToFirst();
chooseIndex = myCursor.getColumnIndexOrThrow(MediaStore.Audio.Media.DATA);
String filePath = myCursor.getString(chooseIndex);
File choosePath = new File(filePath);
chooseLocalAudio(choosePath);
myCursor.close();
}
}private void chooseLocalAudio(String choosePath) {
ContentResolver contentResolver = this.getContentResolver();
AttachBean attachBean = new AttachBean();
if (contentResolver != null) {
Cursor cursor = contentResolver.query(MediaStore.Audio.Media.EXTERNAL_CONTENT_URI, null, null, null, MediaStore.Audio.Media.DEFAULT_SORT_ORDER);
if (cursor != null && cursor.moveToFirst()) {
do {
String filePath = cursor.getString(cursor.getColumnIndexOrThrow(MediaStore.Audio.Media.DATA));
String localAudioPath = new File(filePath).toString();
if (choosePath.equals(localAudioPath)) {
String displayName = cursor.getString(cursor.getColumnIndex(MediaStore.Audio.Media.DISPLAY_NAME));
long duration = cursor.getLong(cursor.getColumnIndex(MediaStore.Audio.Media.DURATION));
long size = cursor.getLong(cursor.getColumnIndex(MediaStore.Audio.Media.SIZE));
long dateAdded = cursor.getLong(cursor.getColumnIndex(MediaStore.Audio.Media.DATE_ADDED)) * 1000;
String title = cursor.getString(cursor.getColumnIndex(MediaStore.Audio.Media.TITLE));
attachBean.setAttachType(AttachColumns.Type.AUDIO);
attachBean.setAddTime(dateAdded);
attachBean.setCreateTime(String.valueOf(dateAdded));
attachBean.setCloud(false);
attachBean.setFileSize(String.valueOf(size));
attachBean.setFilePath(localAudioPath);
attachBean.setLocalDisplayName(Uri.decode(displayName));
attachBean.setTotalTime(String.valueOf(duration));
attachBean.setTitle(title);
mControllerView.setVisibility(View.VISIBLE);
mControllerView.setMediaUrl(localAudioPath);
OfflineCreateActivity.startOfflineCreateActivity(RecordingActivity.this, attachBean);
}
} while (cursor.moveToNext());
cursor.close();
}
}
}
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:
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;
public class GetPathFromUri4kitkat {
@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];
}
// TODO handle non-primary volumes
}
// 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());
}
}应该是:
private void findLocalAudio(Intent data) {
Uri uri = data.getData();
String choosePath = GetPathFromUri4kitkat.getPath(RecordingActivity.this, uri);
chooseLocalAudio(choosePath);
}
}然而然而!!!! 还有一个问题:
项目中可能有这样的需求：下载或导入、导出的图片、音乐等媒体文件，需要马上能在图库或本地视屏播放器中显示出来，或者要能在媒体数据库中查询到媒体文件的相关信息，这时我们就得主动通知系统扫描新的媒体文件了. 这是就需要一个辅助扫描类来帮个忙.
这个扫描的工具类来自 :John-Chen
public class MediaScanner {
private volatile static MediaScanner instance;
private MediaScanner(){
}
public static MediaScanner getInstace(){
synchronized (MediaScanner.class){
if(instance == null){
instance = new MediaScanner();
}
}
return instance;
}
/**
* 扫描一个媒体文件
* @param filePath 要扫描的媒体文件
*/
public void scanFile(Context context, ScanFile filePath) {
List filePaths = new ArrayList(1);
filePaths.add(filePath);
scanFiles(context, filePaths);
}
/**
* 扫描多个媒体文件
* @param filePaths 要扫描的文件列表
*/
public void scanFiles(Context context, List filePaths){
SannerClient client = new SannerClient(context, filePaths);
client.connectAndScan();
}
/**
* 媒体文件扫描对象构造器
*/
public static class ScanFile{
/**
* 要扫描的媒体文件路劲或包含媒体文件的文件夹路径
*/
public String filePaths;
/**
* 要扫描的媒体文件类型 eg: audio/mp3 media/* application/ogg
* image/jpeg image/png video/mpeg video/3gpp
* ......
*/
public String mineType;
public ScanFile(String filePaths, String mineType) {
this.filePaths = filePaths;
this.mineType = mineType;
}
}
public class SannerClient implements
MediaScannerConnection.MediaScannerConnectionClient {
/**
* 要扫描的文件或文件夹
*/
private List scanFiles = null;
/**
* 实际要扫描的单个文件集合
*/
private List filePaths = null;
private MediaScannerConnection mediaScanConn;
public SannerClient(Context context, List scanFiles) {
this.scanFiles = scanFiles;
mediaScanConn = new MediaScannerConnection(context, this);
}
/**
* 连接MediaScanner并开始扫描
*/
public void connectAndScan(){
if(scanFiles != null && !scanFiles.isEmpty()){
this.filePaths = new ArrayList();
//遍历取得单个文件集合
for(ScanFile sf : scanFiles){
findFile(sf);
}
mediaScanConn.connect();
}
}
private void findFile(ScanFile file){
File f = new File(file.filePaths);
if(f.isFile()){
filePaths.add(file);
}else{
File[] fs = f.listFiles();
if(fs != null && fs.length > 0){
for(File cf : fs){
findFile(new ScanFile(cf.getAbsolutePath(), file.mineType));
}
}
}
}
private void scanNext(){
if(filePaths != null && !filePaths.isEmpty()){
ScanFile sf = filePaths.remove(filePaths.size() - 1);
mediaScanConn.scanFile(sf.filePaths, sf.mineType);
}else{
mediaScanConn.disconnect();
}
}
@Override
public void onMediaScannerConnected() {
scanNext();
}
@Override
public void onScanCompleted(String path, Uri uri) {
// TODO Auto-generated method stub
scanNext();
//媒体扫描完成可以配合EventBus等消息通讯工具发出通知,也可接收Intent.ACTION_MEDIA_SCANNER_FINISHED的广播
//EventBus.getDefault().post(new EventMediaScanCompleted(path));
}
}
} PS:
MediaScanner.getInstace().scanFile(this, new MediaScanner.ScanFile(Environment.getExternalStorageDirectory().getAbsolutePath() + “/tencent”, “audio/*”));
依然存在扫描时机不合理的情况.
关于Android获取本地音频的坑2 → http://blog.csdn.net/heartyhu/article/details/53536703