Android之扫描文件或文件夹

我们或许经常会遇到这种情况，明明保存了图片，但是当你打开图片时，却没有找到这张图片，手机重启之后才能看到。这是因为SD卡并没有重新挂载，图库也无法把这张图片加载进去，解决这个问题非常简单，只需要我们模拟一个广播，使SD卡重新挂载即可！

public static void sendBroadCaseRemountSDcard(Activity activity,String filepath) {
try{
if(filepath==null){
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT) {
Intent mediaScanIntent = new Intent(
Intent.ACTION_MEDIA_SCANNER_SCAN_FILE);
Uri contentUri = Uri.fromFile(Environment.getExternalStorageDirectory()); //指定SD卡路径
mediaScanIntent.setData(contentUri);
activity.sendBroadcast(mediaScanIntent);
}
else {
activity.sendBroadcast(new Intent(
Intent.ACTION_MEDIA_MOUNTED,
Uri.parse("file://"+ Environment.getExternalStorageDirectory())));
}
}
else{
Uri data = Uri.parse("file://"+filepath);
activity.sendBroadcast(new Intent(Intent.ACTION_MEDIA_SCANNER_SCAN_FILE, data));
}

}
catch(Exception ex){
LogUtil.WriteError(ex);
Log.e("sendBroadCaseRemountSDcard",ex.getMessage());
ToastUtil.show(activity, "重新挂载SD卡失败，请重启手机查看图片");
}
}

扯淡，这根本没用，要重新加载，必须要扫描文件，要重新挂载文件夹，也是要递归扫描文件下的所有文件夹。

实现代码如下：

//扫描文件
public static void fileScan(Activity activity,String file){
Uri data = Uri.parse("file://"+file);
activity.sendBroadcast(new Intent(Intent.ACTION_MEDIA_SCANNER_SCAN_FILE, data));
}
//扫描文件夹
public static void folderScan(Activity activity,String path){
File file = new File(path);

if(file.isDirectory()){
File[] array = file.listFiles();

for(int i=0;i<array.length;i++){
File f = array[i];

if(f.isFile()){//FILE TYPE
String name = f.getName();

if(name.contains(".mp3")){
fileScan(activity,f.getAbsolutePath());
}
}
else {//FOLDER TYPE
folderScan(activity,f.getAbsolutePath());
}
}
}
}