android如何获取本地文件属性信息

发布网友 发布时间：2022-05-05 02:57

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热心网友 时间：2022-07-01 07:00

通过主动的方式通知系统我们需要文件列表，要向系统发送广播 

sendBroadcast(new Intent(Intent.ACTION_MEDIA_MOUNTED, Uri.parse(“file://” 
+ Environment.getExternalStorageDirectory())));

然后通过接收器获取系统文列表 

  public class MediaScannerReceiver extends BroadcastReceiver 
    { 
        private final static String TAG = ”MediaScannerReceiver”; 
        @Override 
        public void onReceive(Context context, Intent intent) { 
            String action = intent.getAction(); 
            Uri uri = intent.getData(); 
            String externalStoragePath = Environment.getExternalStorageDirectory().getPath(); 
            if (action.equals(Intent.ACTION_BOOT_COMPLETED)) { 
                // scan internal storage 
                scan(context, MediaProvider.INTERNAL_VOLUME); 
            } else { 
                if (uri.getScheme().equals(“file”)) { 
                    // handle intents related to external storage 
                    String path = uri.getPath(); 
                    if (action.equals(Intent.ACTION_MEDIA_MOUNTED) && 
                            externalStoragePath.equals(path)) { 
                        scan(context, MediaProvider.EXTERNAL_VOLUME); 
                    } else if (action.equals(Intent.ACTION_MEDIA_SCANNER_SCAN_FILE) && 
                            path != null && path.startsWith(externalStoragePath + ”/”)) { 
                        scanFile(context, path); 
                    } 
                } 
            } 
        } 
        private void scan(Context context, String volume) { 
            Bundle args = new Bundle(); 
            args.putString(“volume”, volume); 
            context.startService( 
                    new Intent(context, MediaScannerService.class).putExtras(args)); 
        } 
        private void scanFile(Context context, String path) { 
            Bundle args = new Bundle(); 
            args.putString(“filepath”, path); 
            context.startService( 
                    new Intent(context, MediaScannerService.class).putExtras(args)); 
        } 
    }