我应该使用mediascannerconnection.scanfile方法以外的其他方法刷新库吗？
在保存了一个新的jpg之后，我运行媒体扫描程序来刷新gallery应用程序，就像这样
MediaScannerConnection.scanFile(this,
new String[] { fullname }, null,
new MediaScannerConnection.OnScanCompletedListener() {
public void onScanCompleted(String path, Uri uri) {
Log.d("ExternalStorage", "@@@@ Scanned " + path + ":");
Log.d("ExternalStorage", "@@@@ -> uri=" + uri);
}
});
日志的输出显示以下正确的输出
@@@已扫描/data/data/com.mypackage/files/skit_106_01.jpg：
@@@->uri=content://media/external/images/media/95
Gallery应用程序显示没有可用的媒体
这段代码已经完美运行了一段时间了。直到我针对4.4.2版本创建了一个android avd以供进一步测试时，问题才浮出水面。
我拥有的代码似乎是根据androids文档刷新gallery应用程序的推荐方法，因此可能这个问题与我保存文件的方式有关，代码如下。
更新
代码检查外部存储的可用性，并将写入外部存储，如果外部存储不可用，则将文件写入内部存储。
private void doSave(String fname, boolean doShare) {
fname = "skit_"+mCurrentSkitId +
"_"+mSkitManager.getCurrentFrameCount(
mCurrentSkitId)+1;
Log.d(TAG, "@@@@ doSave fName = " + fname + " Current skit id = " + mCurrentSkitId);
CharSequence text = getResources().getString(R.string.saved_as)
+ " " + fname;
try {
Bitmap b = mMainView.getSaveBitmap();
if (b == null) {
text = getResources().getString(R.string.save_fail_1);
;
Toast.makeText(this, text, Toast.LENGTH_LONG).show();
return;
}
fname = FileUtils.replaceInvalidFileNameChars(fname);
String value = fname;
File folder = FileUtils.getWritableFolder(this);
/*
* String folder =
* Environment.getExternalStorageDirectory().toString() +
* "/Pictures"; try { folder =
* Environment.getExternalStoragePublicDirectory
* (Environment.DIRECTORY_PICTURES).toString(); } catch
* (NoSuchFieldError e) {
*
* }
*/
String ext = ".jpg";
if (mPrefs.getString("format", "JPG").equals("PNG"))
ext = ".png";
String fullname = folder.getAbsolutePath() + File.separator + value
+ ext;
Map<String, String> hm = new HashMap<String, String>();
hm.put("filename", fullname);
FileOutputStream fos;
if (folder == getFilesDir())
fos = openFileOutput(value + ext, Context.MODE_WORLD_WRITEABLE);
else {
File f2 = new File(fullname);
fos = new FileOutputStream(f2);
}
b.compress(CompressFormat.JPEG, 95, fos);
fos.close();
String[] str = new String[1];
str[0] = fullname;
if (android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.FROYO) {
MediaScannerConnection.scanFile(this,
new String[] { fullname }, null,
new MediaScannerConnection.OnScanCompletedListener() {
public void onScanCompleted(String path, Uri uri) {
Log.d("ExternalStorage", "@@@@ Scanned " + path + ":");
Log.d("ExternalStorage", "@@@@ -> uri=" + uri);
}
});
}
text = text + value + ext + " "
+ getResources().getString(R.string.saved_end);
;
mLastSaveName = value;
setDetailTitle();
mSkitManager.createFrame(mCurrentSkitId, fullname);
} catch (Exception e) {
Map<String, String> hm = new HashMap<String, String>();
hm.put("text", e.toString());
e.printStackTrace();
text = getResources().getString(R.string.save_fail_2)
+ e.toString();
} catch (Error e) {
Map<String, String> hm = new HashMap<String, String>();
hm.put("text", e.toString());
e.printStackTrace();
text = getResources().getString(R.string.save_fail_2)
+ e.toString();
}
Toast.makeText(this, text, Toast.LENGTH_SHORT).show();
}
检查外部存储可用性的代码如下所示
public static File getWritableFolder(Context context) {
File folder = context.getFilesDir();
if (externalStorageAvailable()) {
try {
folder = Environment
.getExternalStoragePublicDirectory(Environment.DIRECTORY_PICTURES);
if (!folder.exists() || !folder.canWrite()) {
folder = Environment
.getExternalStoragePublicDirectory(Environment.DIRECTORY_DCIM);
}
if (!folder.exists() || !folder.canWrite()) {
folder = Environment.getExternalStorageDirectory();
}
} catch (Exception e) {
folder = Environment.getExternalStorageDirectory();
} catch (Error e) {
folder = Environment.getExternalStorageDirectory();
}
if (!folder.exists() || !folder.canWrite()) {
folder = context.getFilesDir();
}
}
return folder;
}
private static boolean externalStorageAvailable() {
boolean mExternalStorageAvailable;
boolean mExternalStorageWriteable;
String state = Environment.getExternalStorageState();
if (state.equals(Environment.MEDIA_MOUNTED)) {
// We can read and write the media
mExternalStorageAvailable = mExternalStorageWriteable = true;
} else if (state.equals(Environment.MEDIA_MOUNTED_READ_ONLY)) {
// We can only read the media
mExternalStorageAvailable = true;
mExternalStorageWriteable = false;
} else {
// Something else is wrong. It may be one of many other states, but
// all we need
// to know is we can neither read nor write
mExternalStorageAvailable = mExternalStorageWriteable = false;
}
return mExternalStorageAvailable && mExternalStorageWriteable;
}
如果有人能够在上面的任何一个问题上找出有助于解决这个问题的漏洞，那就太好了。
最佳答案
我的结果与MediaScannerConnection不一致，所以我改用sendBroadcast方法。我不知道sendBroadcast方法是否不标准/不应该使用，但它对我有效。
public void galleryAddPic(File currentPhotoPath) {
Intent mediaScanIntent = new Intent(Intent.ACTION_MEDIA_SCANNER_SCAN_FILE);
Uri contentUri = Uri.fromFile(currentPhotoPath);
mediaScanIntent.setData(contentUri);
this.sendBroadcast(mediaScanIntent);
}
关于
MediaScannerConnection：https://stackoverflow.com/a/4825615/1497188