blocks|key|4165638|text|要想更深入地理解MediaPlayer，最好阅读官方文档https://developer.android.com/reference/android/media/MediaPlayer#setDataSource(android.content.res.AssetFileDescriptor)。但为了基本理解，这里是代码示例。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|4165639|MediaPlayer+mp+=+new+MediaPlayer();

++++++++//+Here+you+may+set+which+stream+to+use+either+MEDIA+or+ALARM+etc.
++++++++mp.setAudioStreamType(AudioManager.STREAM_ALARM);
++++++++try+{
++++++++++++if+(isAnyActiveSongExist){
++++++++++++++++//+Here+you+may+set+dataSource+as+path+of+the+file
++++++++++++++++mp.setDataSource(firstPrioritySongEntityPath);
++++++++++++}
++++++++++++else{
++++++++++++++++//+Here+you+may+set+dataSource+using+Uri
++++++++++++++++mp.setDataSource(context,+Settings.System.DEFAULT_RINGTONE_URI);
++++++++++++}

++++++++++++mp.prepare();
++++++++}+catch+(IOException+e)+{
++++++++++++e.printStackTrace();
++++++++}
++++++++mp.start();|code-block|syntax|javascript|4165640|setDataSource()定义MediaPlayer应该使用哪个文件来播放。|4165641|entityMap|0|LINK|mutability|MUTABLE|url|https://developer.android.com/reference/android/media/MediaPlayer#setDataSource(android.content.res.AssetFileDescriptor))^0|S|3C|0|0|0|0^^$0|@$1|2|3|4|5|6|7|S|8|@]|9|@$A|T|B|U|1|V]]|C|$]]|$1|D|3|E|5|F|7|W|8|@]|9|@]|C|$G|H]]|$1|I|3|J|5|6|7|X|8|@]|9|@]|C|$]]|$1|K|3|-4|5|6|7|Y|8|@]|9|@]|C|$]]]|L|$M|$5|N|O|P|C|$Q|R]]]]

Well, for more deep understanding of MediaPlayer that's better to read official documentation <a href="https://developer.android.com/reference/android/media/MediaPlayer#setDataSource(android.content.res.AssetFileDescriptor)" rel="nofollow noreferrer">https://developer.android.com/reference/android/media/MediaPlayer#setDataSource(android.content.res.AssetFileDescriptor)</a>. But for basic comprehension here is the code example.
<pre><code>MediaPlayer mp = new MediaPlayer();

 // Here you may set which stream to use either MEDIA or ALARM etc.
 mp.setAudioStreamType(AudioManager.STREAM_ALARM);
 try {
 if (isAnyActiveSongExist){
 // Here you may set dataSource as path of the file
 mp.setDataSource(firstPrioritySongEntityPath);
 }
 else{
 // Here you may set dataSource using Uri
 mp.setDataSource(context, Settings.System.DEFAULT_RINGTONE_URI);
 }

 mp.prepare();
 } catch (IOException e) {
 e.printStackTrace();
 }
 mp.start();
</code></pre>
setDataSource() defines which file should be used by your MediaPlayer for playing.

blocks|key|4165780|text|首先，代码从来都不是简单和容易的，除非你不去经历它。检查这个链接click+here，我想你会从这里得到答案|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|4165781|关于setDataSource(字符串)调用|style|BOLD|4165782|在看到您的评论之后，看起来您确实希望使用setDataSource(string)来实现您的目的。我不明白为什么。但是，我假设的是，出于某种原因，您试图避免使用“上下文”。如果不是这样，那么上面的两个解决方案应该可以完美地为您工作，或者如果您试图避免上下文，我担心这是不可能的函数与签名setDataSource(字符串)调用。原因如下：|4165783|MediaPlayer+setDataSource()函数具有以下选项，其中您只对setDataSource(String)感兴趣。|4165784|​|4165785|📷|atomic|4165786|4165787|public+void+setDataSource(String+path)
++++++++++++throws+IOException,+IllegalArgumentException,+SecurityException,+IllegalStateException+{
++++++++setDataSource(path,+null,+null);
++++}|code-block|syntax|javascript|4165788|如果你检查setDataSource(字符串路径，JNI键，JNI值)代码，你会看到下面的条件根据它的方案过滤路径，特别是如果它是称为setDataSource(FileDescriptor)的“文件”方案，或者如果方案不是“文件”，它会调用原生String[]媒体函数。|4165789|{
++++++++final+Uri+uri+=+Uri.parse(path);
++++++++final+String+scheme+=+uri.getScheme();
++++++++if+("file".equals(scheme))+{
++++++++++++path+=+uri.getPath();
++++++++}+else+if+(scheme+!=+null)+{
++++++++++++//+handle+non-file+sources
++++++++++++nativeSetDataSource(
++++++++++++++++MediaHTTPService.createHttpServiceBinderIfNecessary(path),
++++++++++++++++path,
++++++++++++++++keys,
++++++++++++++++values);
++++++++++++return;
++++++++}
++++++++final+File+file+=+new+File(path);
++++++++if+(file.exists())+{
++++++++++++FileInputStream+is+=+new+FileInputStream(file);
++++++++++++FileDescriptor+fd+=+is.getFD();
++++++++++++setDataSource(fd);
++++++++++++is.close();
++++++++}+else+{
++++++++++++throw+new+IOException("setDataSource+failed.");
++++++++}
}|4165790|在上面的代码中，您的资源文件URI方案将不为空(android.resource://)，并且setDataSource(字符串)将尝试使用原生JNI函数nativeSetDataSource()，认为您的路径是http/https/rtsp，显然，该调用也将失败，不会抛出任何异常。这就是为什么您对setDataSource(String)的调用可以在没有异常的情况下转义，并通过以下异常来准备()调用。|4165791|Prepare+failed.:+status=0x1|4165792|因此setDataSource(字符串)覆盖不能处理您资源文件。为此，您需要选择另一个覆盖。|4165793|另一方面，检查setDataSource(Context+context，Uri+uri)使用的setDataSource(Context+context，URI+uri，Map+headers)，它使用AssetFileDescriptor、来自您的上下文的ContentResolver和openAssetFileDescriptor打开Uri，成功的原因是openAssetFileDescriptor()可以打开您的资源文件，最后生成的fd用于调用setDataSource(FileDescriptor)覆盖。|4165794|+AssetFileDescriptor+fd+=+null;
++++try+{
++++++++ContentResolver+resolver+=+context.getContentResolver();
++++++++fd+=+resolver.openAssetFileDescriptor(uri,+"r");
++++++++//++:
++++++++//++:
++++++++//++:
++++++++if+(fd.getDeclaredLength()+<+0)+{
++++++++++++++++setDataSource(fd.getFileDescriptor());
++++++++++++}+else+{
++++++++++++++++setDataSource(fd.getFileDescriptor(),+fd.getStartOffset(),+fd.getDeclaredLength());
++++++++++++}|4165795|总之，您不能为了使用资源mp3文件而使用setDataSource(字符串)覆盖。相反，如果您希望使用字符串播放资源文件，则可以使用上面给出MediaPlayer.create()静态函数和getIdentifier()，或者使用Update#1中给出的setDataSource(context，uri)。|4165796|要了解更多信息，请参阅完整的源代码：Android+MediaPlayer|4165797|entityMap|0|LINK|mutability|MUTABLE|url|https://stackoverflow.com/questions/33086417/mediaplayer-setdatasourcestring-not-working-with-local-files|1|IMAGE|IMMUTABLE|imageUrl|https://ask.qcloudimg.com/http-save/yehe-900000/0d49f5360ceb2611a7a215974687130b.png|imageAlt|2|https://github.com/aosp-mirror/platform_frameworks_base/blob/master/media/java/android/media/MediaPlayer.java^0|W|A|0|0|0|M|0|0|0|0|0|1|1|0|0|0|0|0|0|0|0|0|0|0|I|J|2|0^^$0|@$1|2|3|4|5|6|7|1U|8|@]|9|@$A|1V|B|1W|1|1X]]|C|$]]|$1|D|3|E|5|6|7|1Y|8|@$A|1Z|B|20|F|G]]|9|@]|C|$]]|$1|H|3|I|5|6|7|21|8|@]|9|@]|C|$]]|$1|J|3|K|5|6|7|22|8|@]|9|@]|C|$]]|$1|L|3|M|5|6|7|23|8|@]|9|@]|C|$]]|$1|N|3|O|5|P|7|24|8|@]|9|@$A|25|B|26|1|27]]|C|$]]|$1|Q|3|M|5|6|7|28|8|@]|9|@]|C|$]]|$1|R|3|S|5|T|7|29|8|@]|9|@]|C|$U|V]]|$1|W|3|X|5|6|7|2A|8|@]|9|@]|C|$]]|$1|Y|3|Z|5|T|7|2B|8|@]|9|@]|C|$U|V]]|$1|10|3|11|5|6|7|2C|8|@]|9|@]|C|$]]|$1|12|3|13|5|T|7|2D|8|@]|9|@]|C|$U|V]]|$1|14|3|15|5|6|7|2E|8|@]|9|@]|C|$]]|$1|16|3|17|5|6|7|2F|8|@]|9|@]|C|$]]|$1|18|3|19|5|T|7|2G|8|@]|9|@]|C|$U|V]]|$1|1A|3|1B|5|6|7|2H|8|@]|9|@]|C|$]]|$1|1C|3|1D|5|6|7|2I|8|@]|9|@$A|2J|B|2K|1|2L]]|C|$]]|$1|1E|3|-4|5|6|7|2M|8|@]|9|@]|C|$]]]|1F|$1G|$5|1H|1I|1J|C|$1K|1L]]|1M|$5|1N|1I|1O|C|$1P|1Q|1R|-4]]|1S|$5|1H|1I|1J|C|$1K|1T]]]]

First of all, code never been simple and easy until you'll not go through it. Check this link <a href="https://stackoverflow.com/questions/33086417/mediaplayer-setdatasourcestring-not-working-with-local-files">click here</a>, I think you'll have your answer from here
About setDataSource(String) call
After seeing your comment, it looks like you exactly want setDataSource(string) to be used for your purpose. I don't understand why. But, what I assume is, for some reason you are trying to avoid using &quot;context&quot;. If that is not the case then the above two solutions should work perfectly for you or if you are trying to avoid context, I'm afraid that is not possible with the function with signature setDataSource(String) call. The reason is as below,
MediaPlayer setDataSource() function has these below options out of which you are only interested in setDataSource(String),
<a href="https://i.stack.imgur.com/pKtTd.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/pKtTd.png" alt="enter image description here" /></a>
<pre><code>public void setDataSource(String path)
 throws IOException, IllegalArgumentException, SecurityException, IllegalStateException {
 setDataSource(path, null, null);
 }
</code></pre>
and if you check setDataSource(String path, String[] keys, String[] values) code, you will see the below condition filtering the path based on its scheme, particularly if it is &quot;file&quot; scheme it calls setDataSource(FileDescriptor) or if scheme is non &quot;file&quot;, it calls native JNI media function.
<pre><code>{
 final Uri uri = Uri.parse(path);
 final String scheme = uri.getScheme();
 if (&quot;file&quot;.equals(scheme)) {
 path = uri.getPath();
 } else if (scheme != null) {
 // handle non-file sources
 nativeSetDataSource(
 MediaHTTPService.createHttpServiceBinderIfNecessary(path),
 path,
 keys,
 values);
 return;
 }
 final File file = new File(path);
 if (file.exists()) {
 FileInputStream is = new FileInputStream(file);
 FileDescriptor fd = is.getFD();
 setDataSource(fd);
 is.close();
 } else {
 throw new IOException(&quot;setDataSource failed.&quot;);
 }
}
</code></pre>
In the above code, your resource file URI scheme will not be null (android.resource://) and setDataSource(String) will try to use native JNI function nativeSetDataSource() thinking that your path is http/https/rtsp and obviously that call will fail as well without throwing any exception. Thats why your call to setDataSource(String) escapes without an exception and gets to prepare() call with the following exception.
<pre><code>Prepare failed.: status=0x1
</code></pre>
So setDataSource(String) override cannot handle your resource file. You need to choose another override for that.
On the other side, check setDataSource(Context context, Uri uri, Map headers) which is used by setDataSource(Context context, Uri uri), it uses AssetFileDescriptor, ContentResolver from your context and openAssetFileDescriptor to open the URI which gets success as openAssetFileDescriptor() can open your resource file and finally the resultant fd is used to call setDataSource(FileDescriptor) override.
<pre><code> AssetFileDescriptor fd = null;
 try {
 ContentResolver resolver = context.getContentResolver();
 fd = resolver.openAssetFileDescriptor(uri, &quot;r&quot;);
 // :
 // :
 // :
 if (fd.getDeclaredLength() &lt; 0) {
 setDataSource(fd.getFileDescriptor());
 } else {
 setDataSource(fd.getFileDescriptor(), fd.getStartOffset(), fd.getDeclaredLength());
 }
</code></pre>
To conclude, you cannot use setDataSource(String) override as is to use your resource mp3 file. Instead, if you want use string to play your resource file you can use either MediaPlayer.create() static function with getIdentifier() as given above or setDataSource(context,uri) as given in Update#1.
Refer to the complete source code for more understanding here: <a href="https://github.com/aosp-mirror/platform_frameworks_base/blob/master/media/java/android/media/MediaPlayer.java" rel="nofollow noreferrer">Android MediaPlayer</a>

I am learning about mediaplayer in android.
I wanted some simple and easy to understand code example of <code>MediaPlayer.setDataSource()</code>.

Demo of MediaPlayer.setDataSource()?

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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我正在学习android中的mediaplayer。我想要一些简单易懂的MediaPlayer.setDataSource()代码示例。

问MediaPlayer.setDataSource()的演示？
EN

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问MediaPlayer.setDataSource()的演示？EN