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[Infra] Adding a button to snapshot the current Media Browse Tree #28
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ff4d395
Adding permissions request
c979015
Working dfs
ac86dc4
Working with race condition
d7d3228
Moving DFS to separate file
891ed0f
working browser DFS with init
d5e4693
Extract into functions
2c6fac8
Changing to Document Request intent
0e80bcf
Switching to kotlin suspend funs
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126 changes: 126 additions & 0 deletions
126
mediacontroller/src/main/java/com/example/android/mediacontroller/MediaBrowseTreeSnapshot.kt
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,126 @@ | ||
| package com.example.android.mediacontroller | ||
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| import android.content.Context | ||
| import android.os.Handler | ||
| import android.os.Looper | ||
| import android.support.v4.media.MediaBrowserCompat | ||
| import android.support.v4.media.MediaBrowserCompat.SubscriptionCallback | ||
| import android.util.Log | ||
| import android.widget.Toast | ||
| import androidx.lifecycle.ViewModel | ||
| import androidx.lifecycle.viewModelScope | ||
| import kotlinx.coroutines.launch | ||
| import java.io.OutputStream | ||
| import java.io.PrintWriter | ||
| import kotlin.coroutines.resume | ||
| import kotlin.coroutines.suspendCoroutine | ||
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| class MediaBrowseTreeSnapshot(private val context: Context, private val browser: MediaBrowserCompat):ViewModel() { | ||
| private val TAG = "MediaBrowseTreeSnapshot" | ||
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| /** | ||
| * Loads the browsers top level children and runs a DFS on them printing out | ||
| * each media item's contentes as it is visited. | ||
| */ | ||
| fun takeBrowserSnapshot(outputStream: OutputStream) { | ||
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| viewModelScope.launch { | ||
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val mediaItems: MutableList |
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| if (mediaItems.isNotEmpty()) { | ||
| runDFSOnBrowseTree(mediaItems, outputStream) | ||
| for (item in mediaItems) { | ||
| Log.i(TAG, item.toString()) | ||
| } | ||
| } else { | ||
| notifyUser("No media items found, could not save tree.") | ||
| } | ||
| } | ||
| } | ||
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private suspend fun getChildNodes(rootItemMid: String): MutableList |
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| suspendCoroutine { | ||
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val mediaItems: MutableList |
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| browser.subscribe(rootItemMid, object : SubscriptionCallback() { | ||
| override fun onChildrenLoaded(parentId: String, | ||
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children: List |
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| // Notify the main thread that all of the children have loaded | ||
| mediaItems.addAll(children) | ||
| super.onChildrenLoaded(parentId, children) | ||
| it.resume(mediaItems) | ||
| } | ||
| }) | ||
| } | ||
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| /** | ||
| * Kicks off the browse tree depth first search by visiting all of the top level media | ||
| * item nodes. | ||
| */ | ||
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private suspend fun runDFSOnBrowseTree(mediaItems: MutableList |
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| val printWriter = PrintWriter(outputStream) | ||
| printWriter.println("Root:") | ||
| for (item in mediaItems) { | ||
| visitMediaItemNode(item, printWriter, 1) | ||
| } | ||
| printWriter.flush() | ||
| printWriter.close() | ||
| outputStream.close() | ||
| notifyUser("MediaItems saved to specified location.") | ||
| } | ||
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| /** | ||
| * Visits a media item node by printing out its contents and then visiting all of its children. | ||
| */ | ||
| private suspend fun visitMediaItemNode(mediaItem: MediaBrowserCompat.MediaItem?, printWriter: PrintWriter, depth: Int) { | ||
| if (mediaItem != null) { | ||
| printMediaItemDescription(printWriter, mediaItem, depth) | ||
| val mid = if (mediaItem.mediaId != null) mediaItem.mediaId!! else "" | ||
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| // If a media item is not a leaf continue DFS on it | ||
| if (mediaItem.isBrowsable && mid != "") { | ||
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val mediaChildren: MutableList |
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| // Run visit on all of the nodes children | ||
| for (mediaItemChild in mediaChildren) { | ||
| visitMediaItemNode(mediaItemChild, printWriter, depth + 1) | ||
| Log.i(TAG, "Visiting:" + mediaItemChild.toString()) | ||
| } | ||
| } | ||
| } | ||
| } | ||
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| /** | ||
| * Prints the contents of a media item using a print writer. | ||
| */ | ||
| private fun printMediaItemDescription(printWriter: PrintWriter, mediaItem: MediaBrowserCompat.MediaItem, depth: Int) { | ||
| val descriptionCompat = mediaItem.description | ||
| // Tab the media item to the respective depth | ||
| val tabStr = String(CharArray(depth)).replace("\u0000", | ||
| "\t") | ||
| val titleStr = if (descriptionCompat.title != null) descriptionCompat.title.toString() else "NAN" | ||
| val subTitleStr = if (descriptionCompat.subtitle != null) descriptionCompat.subtitle.toString() else "NAN" | ||
| val mIDStr = if (descriptionCompat.mediaId != null) descriptionCompat.mediaId else "NAN" | ||
| val uriStr = if (descriptionCompat.mediaUri != null) descriptionCompat.mediaUri.toString() else "NAN" | ||
| val desStr = if (descriptionCompat.description != null) descriptionCompat.description.toString() else "NAN" | ||
| val infoStr = String.format( | ||
| "%sTitle:%s,Subtitle:%s,MediaId:%s,URI:%s,Description:%s", | ||
| tabStr, titleStr, subTitleStr, mIDStr, uriStr, desStr) | ||
| printWriter.println(infoStr) | ||
| } | ||
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| /** | ||
| * Display formatted toast to user. | ||
| */ | ||
| private fun notifyUser(textToNotify: String) { | ||
| Handler(Looper.getMainLooper()).post { | ||
| val toast = Toast.makeText( | ||
| context, | ||
| textToNotify, | ||
| Toast.LENGTH_LONG) | ||
| toast.setMargin(50f, 50f) | ||
| toast.show() | ||
| } | ||
| } | ||
| } | ||
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Consider whether this bit (the output part) should be wrapped in a
withContext(Dispatchers.IO)block.There was a problem hiding this comment.
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Sounds good! I will merge this then update the functionality soon.