Develop Reference

Android check existence of file in android internal storage

I put some .mp4 file in a folder in my android device internal storage. And then I play this file from my application. It plays well if exists otherwise app crushed.
So before play file I want to check its existence.
I tried below code but no luck.
File file = new File("file:///storage/emulated/0/tutorial/1a1cbfc4-18cb-4637-8405-01bf9bebeda3.mp4");
if (file.exists()) {
LogUtil.printLogMessage(VideoListActivity.class.getName(), "video File", "file exist");
} else {
LogUtil.printLogMessage(VideoListActivity.class.getName(), "video File", "file not exist");
}
i am sure the file is exist in the folder named tutorial in my internal storage.

Use file.isFile() for file & file.isDirectory() for directory,
file.exists() tries to access the file which causes it to crash if the file doesn't exist, file.isFile() uses linux stat, which only returns the information about the file without trying to access it.

Please make proper file name, Replace with File myDirectory = new File(Environment.getExternalStorageDirectory(), dirName);
public Boolean checkFile(){
File file = new File("/storage/emulated/0/tutorial/1a1cbfc4-18cb-4637-8405-01bf9bebeda3.mp4");
if (file.exists()) {
return true;
} else {
return false;
}
}
Use checkfile True/False flag before video play.

Try this
File file = new File(path);
if (!file.isFile()) {
}else{
}

How to get the full path Mp3 songs from internal storage?

I want to implement a simple Media Player.How can i retrieve the full path of Mp3 songs from internal storage in android.

mpintro = MediaPlayer.create(this, Uri.parse(Environment.getExternalStorageDirectory().getPath()+ "/Music/intro.mp3"));
mpintro.setLooping(true);
mpintro.start();

If you have any problem search first. do your efforts you'll find it...
here's a link try it Get Mp3 from SD card

Try this check for file if it exists or not
public static String rootPath = Environment.getExternalStorageDirectory() + "/YourDirectory/";
File file = new File(Environment.getExternalStorageDirectory()
+ "/YourDirectoryFolder/Audio/" + NmaeofFile + "/");
if (!file.exists())
return false;
else{
//Do your work here
}
And then simply start media player
player.setDataSource(rootPath);//rootpath is the path of your file
player.prepare();
player.start();

Can not play video from my internal application directory

It looks like I can not play videos stored in my internal application directory.
I have videos stored in /data/data/my.package.org/files/
And I'm trying to play a file from there using
String fpath = "/data/data/my.package.org/files/video.mpg"
Intent intent = new Intent(Intent.ACTION_VIEW);
intent.setDataAndType(Uri.parse(fpath), "video/*");
But both Android default video player and some external videoplayer (MX player) say 'this video can not be played".
Whereas when I'm saving videos to SD card they are played fine.
Why is that?

Put your video in assets folder and use this code to play video with MediaPlayer
InputStream is = getResources().getAssets().open("video.mpg");
OR
Put your video in assets folder and...
String fpath = "/data/data/my.package.org/assets/video.mpg"
Intent intent = new Intent(Intent.ACTION_VIEW);
intent.setDataAndType(Uri.parse(fpath), "video/*");

put your video in the res\raw folder. Then copy it out to the external directories where apps like video player can read them. Only your app can read /data/data/blah....
if its in res\raw, then
typeName = sourceSink.Types.video.toString();
for (sourceSink.VideoFiles video: sourceSink.VideoFiles.values() ){
resourceName = video.toString();
fileName = resourceName + ".mp4";
resource = getResources().getIdentifier(resourceName, "raw", "com.invodo.allshareplay");
createExternalStoragePublicFile(typeName,fileName,resource);
}
and then you can use this to copy it:
void createExternalStoragePublicFile(String fType, String fname, int res ) {
// Create a path where we will place our picture in the user's
// public pictures directory. Note that you should be careful about
// what you place here, since the user often manages these files. For
// pictures and other media owned by the application, consider
// Context.getExternalMediaDir().
File path = null;
if (((fType.equals(sourceSink.Types.photo.toString())) || (fType.equals(sourceSink.Types.file.toString())) ) ){
path = Environment.getExternalStoragePublicDirectory(
Environment.DIRECTORY_PICTURES);
}
if (fType.equals(sourceSink.Types.music.toString())) {
path = Environment.getExternalStoragePublicDirectory(
Environment.DIRECTORY_MUSIC);
}
if (fType.equals(sourceSink.Types.video.toString())) {
path = Environment.getExternalStoragePublicDirectory(
Environment.DIRECTORY_MOVIES);
}
File file = new File(path, "/" + fname);
try {
// Make sure the Pictures directory exists.
path.mkdirs();
// Very simple code to copy a picture from the application's
// resource into the external file. Note that this code does
// no error checking, and assumes the picture is small (does not
// try to copy it in chunks). Note that if external storage is
// not currently mounted this will silently fail.
InputStream is = getResources().openRawResource(res);
OutputStream os = new FileOutputStream(file);
byte[] data = new byte[is.available()];
is.read(data);
os.write(data);
is.close();
os.close();
scanMedia(file);
} catch (IOException e) {
// Unable to create file, likely because external storage is
// not currently mounted.
Log.w("ExternalStorage", "Error writing " + file, e);
}
}

then it's easy - just do the second half of the answer I provided and write them out. /data/data/ folder is never going to be viewed by anything other than your app.

Can't get media player to work when SD drive is not installed

First I make a call to
get_fullPathToAudio();
to determine the path of where an audio file was downloaded.
public File get_fullPathToAudioAsFile()
{
File storageFile = this.getExternalFilesDir(null);
if (storageFile == null)
{
// no external storage so store on private path
storageFile = this.getFilesDir();
}
return storageFile;
}
public String get_fullPathToAudio() {
return get_fullPathToAudioAsFile() + File.separator + this.get_currentArticleAudioFileName();
}
String filePath = this.myApp.get_fullPathToAudio();
mediaPlayer.setDataSource(filePath);
mediaPlayer.prepare();
mediaPlayer.start();
All works well if I have an SD drive on my emulator but when I don't have an emulator the function
get_fullPathToAudioAsFile();
uses
getFilesDir();
instead of
getExternalFilesDir(null);
which returns a path to my private drive where my app is installed. I can see the file in
data/data/com.myapp/files/myfile.m4a
for example. Is there a different way to play an audio file if it's not on the SD drive?
The error messsage I get is
error(-1, -2147483648)
Could not open file null for playback

I solved it this way
FileInputStream fileInputStream = new FileInputStream(mFile);
mPlayer.setDataSource(fileInputStream.getFD());
mPlayer.prepare();
MediaPlayer error -2147483648 when playing file on internal storage

Reading mp3 from expansion file

Reading mp3 file from expansion file
I have create and expansion file with name
"main.1.com.example.app.obb"
which contains and audio file name "about_eng.mp3"
Now the issue i have written the following code to read and play the mp3 file
private final static String EXP_PATH = "/Android/obb/";
static String[] getAPKExpansionFiles(Context ctx, int mainVersion, int patchVersion) {
String packageName = ctx.getPackageName();
Vector<String> ret = new Vector<String>();
if (Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED)) {
// Build the full path to the app's expansion files
File root = Environment.getExternalStorageDirectory();
File expPath = new File(root.toString() + EXP_PATH + packageName);
// Check that expansion file path exists
if (expPath.exists()) {
if ( mainVersion > 0 ) {
String strMainPath = expPath + File.separator + "main." +
mainVersion + "." + packageName + ".obb";
File main = new File(strMainPath);
if ( main.isFile() ) {
ret.add(strMainPath);
}
}
if ( patchVersion > 0 ) {
String strPatchPath = expPath + File.separator + "patch." +
mainVersion + "." + packageName + ".obb";
File main = new File(strPatchPath);
if ( main.isFile() ) {
ret.add(strPatchPath);
}
}
}
}
String[] retArray = new String[ret.size()];
ret.toArray(retArray);
return retArray;
}
#Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
// Get a ZipResourceFile representing a merger of both the main and patch files
try {
ZipResourceFile expansionFile = APKExpansionSupport.getAPKExpansionZipFile(this,1,1);
if(expansionFile!=null){
AssetFileDescriptor fd = expansionFile.getAssetFileDescriptor("about_eng.mp3");
//or
MediaPlayer mediaPlayer = new MediaPlayer();
mediaPlayer.setDataSource( fd.getFileDescriptor(),
fd.getStartOffset(),fd.getLength());
mediaPlayer.prepare();
mediaPlayer.start();
}
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
// Get an input stream for a known file inside the expansion file ZIPs
}
But it is always throwing exception at this line
mediaPlayer.setDataSource( fd.getFileDescriptor(),
fd.getStartOffset(),fd.getLength());
mediaPlayer.prepare();
because the variable fd is null.
Can any body help me to solve this

i have googled and found that we shold have to make .zip with 0% (No compression) that is mention in http://developer.android.com/google/play/expansion-files.html
Tip: If you're packaging media files into a ZIP, you can use media playback calls on the files with offset and length controls (such as MediaPlayer.setDataSource() and SoundPool.load()) without the need to unpack your ZIP. In order for this to work, you must not perform additional compression on the media files when creating the ZIP packages. For example, when using the zip tool, you should use the -n option to specify the file suffixes that should not be compressed:
zip -n .mp4;.ogg main_expansion media_files
so How to make 0% compression zip using winrar?
here see the compression method
so we should have to upload this zip in play store.
so you not need to use ZipHelper.java that is mentioned in other SO answer
just simply use
ZipResourceFile expansionFile=null;
try {
expansionFile = APKExpansionSupport.getAPKExpansionZipFile(getApplicationContext(),3,0);
AssetFileDescriptor fd = expansionFile.getAssetFileDescriptor("test.mp3");
MediaPlayer mPlayer = new MediaPlayer();
mPlayer.setAudioStreamType(AudioManager.STREAM_MUSIC);
mPlayer.setDataSource(fd.getFileDescriptor(),fd.getStartOffset(),fd.getLength());
mPlayer.prepare();
mPlayer.start();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}

Try to use expansionFile.getAssetFileDescriptor("main_expansion/about_eng.mp3").
If it doesn't work, call this:
ZipResourceFile.ZipEntryRO [] entries = expansionFile.getAllEntries();
and look at the file names:
entries[0].mFileName;.
That could be a hint how the path should look like.
I know that the question is old, but maybe it helps someone.

To read mp3, with mediaplayer, you can do it 3 ways
for example. my application package name is
com.bluewindsolution.android.sampleapp
then my expansion file should be
main.1.com.bluewindsolution.android.sampleapp.obb
in detail, you can followed in here
[main|patch].< expansion-version >.< package-name >.obb
From expansion you can get it via 3 ways:
via AssetFileDescriptor
// this one work with image file, media file
// Get a ZipResourceFile representing a specific expansion file
// mainContext, version no. of your main expansion, version no of your patch
ZipResourceFile expansionFile = APKExpansionSupport.getAPKExpansionZipFile(this, 1, 0);
AssetFileDescriptor afd_img1 = expansionFile.getAssetFileDescriptor("your_path/your_file.jpg");
AssetFileDescriptor afd_mpbg = expansionFile.getAssetFileDescriptor("your_path/your_file.mp3");
// to set image
ImageView imageView1 = (ImageView)findViewById(R.id.iv1);
imageView1.setImageBitmap(BitmapFactory.decodeFileDescriptor(afd_iv1.getFileDescriptor()));
// to set sound
try {
mpbg.setDataSource(afd_mpbg.getFileDescriptor(), afd_mpbg.getStartOffset(), afd_mpbg.getDeclaredLength());
mpbg.prepareAsync();
mpbg.start();
} catch (IllegalStateException e) {
Log.w("Error=====", "Failed to prepare media player", e);
}
via InputStream
// this one work with image file, media file
// Get a ZipResourceFile representing a specific expansion file
ZipResourceFile expansionFile = new ZipResourceFile(filePathToMyZip);
// Get an input stream for a known file inside the expansion file ZIPs
InputStream fileStream = expansionFile.getInputStream(pathToFileInsideZip);
via Uri
//this one can use in almost thing such as jpg, mp3, mp4, pdf, etc.
//you need to create new class to override APEZProvider
public class ZipFileContentProvider extends APEZProvider {
#Override
public String getAuthority() {
return "com.bluewindsolution.android.sampleapp";
}
}
//you need to add <provider> in AndroidManifest.xml
<provider
android:name="com.bluewindsolution.android.sampleapp.ZipFileContentProvider"
android:authorities="com.bluewindsolution.android.sampleapp"
android:exported="false"
android:multiprocess="true"
>
<meta-data android:name="mainVersion"
android:value="1"></meta-data>
</provider>
//after that you can use it any time by this code:
String filename2 = "image/i_commu_a_1_1_1_1.jpg"; // suppose you store put your file in directory in .obb
String uriString2 = "content://com.bluewindsolution.android.sampleapp" + File.separator + filename2;
Uri uri2 = Uri.parse(uriString2);
imageView2.setImageURI(uri2);
// Filename inside my expansion file
String filename = "video/v_do_1_1_1.mp4"; // suppose you store put your file in directory in .obb
String uriString = "content://com.bw.sample_extension_download_main" + File.separator + filename;
Uri uri = Uri.parse(uriString);
v1 = (VideoView)findViewById(R.id.videoView1);
v1.setVideoURI(uri);
v1.start();