从 uri 播放音频

Question

当我尝试播放音频文件时出现 java.lang.SecurityException。我尝试制作简单的应用程序，从手机内存中选择音频并使用 sqlite 保存它并列出之前选择的那些。

在应用程序中，第一次播放音频文件没有任何错误。但是在我重新启动应用程序后它没有播放 returns SecurityException. 我正在使用下面的代码来选择音频文件

       Intent intent = new Intent();
                intent.setType("audio/*");
                intent.setAction(Intent.ACTION_GET_CONTENT);
                startActivityForResult(Intent.createChooser(intent,"Select Audio "), REQUEST_CODE);

  @Override
    protected void onActivityResult(int requestCode, int resultCode, final Intent data) {
        if(requestCode == REQUEST_CODE && data != null){
            Toast.makeText(MainActivity.this, "DATA " + data.getData(), Toast.LENGTH_SHORT).show();
            //Prompting alertdialog for name of the audio file           
           AlertDialog.Builder builder = new AlertDialog.Builder(this);
            builder.setTitle("Enter name for audio");
            final EditText input = new EditText(this);
            input.setInputType(InputType.TYPE_CLASS_TEXT);
            builder.setView(input);
            builder.setPositiveButton(android.R.string.ok, new DialogInterface.OnClickListener() {
                @Override
                public void onClick(DialogInterface dialog, int which) {
                   sql.addToHistory(new soundDB.Effects(null,data.getData().toString(),input.getText().toString()));
               new loadEffects().execute();
                }
            });
            builder.setNegativeButton(android.R.string.cancel, new DialogInterface.OnClickListener() {
                @Override
                public void onClick(DialogInterface dialog, int which) {
                    dialog.cancel();
                }
            });

            builder.show();
        }
        super.onActivityResult(requestCode, resultCode, data);
    }

并且我在清单文件中使用这些权限

 <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.MANAGE_DOCUMENTS" />
<uses-permission android:name="android.permission.ACCESS_DOWNLOAD_MANAGER" />
<uses-permission android:name="android.permission.ACCESS_ALL_DOWNLOADS" />
<uses-permission android:name="android.permission.ACCESS_DOWNLOAD_MANAGER_ADVANCED" />

06-25 11:45:21.902 17298-17372/? I/DefaultRequestDirector: I/O exception (javax.net.ssl.SSLException) caught when processing request: Write error: ssl=0x8d334c00: I/O error during system call, Broken pipe
06-25 11:46:03.204 7086-7086/? I/dex2oat: dex2oat took 893.003ms (threads: 4) arena alloc=3KB (3288B) java alloc=2MB (2752008B) native alloc=3MB (3826768B) free=2MB (2464688B)
06-25 11:46:12.890 7234-7234/? W/MediaPlayer: Couldn't open content://com.android.providers.downloads.documents/document/545: java.lang.SecurityException: Permission Denial: opening provider com.android.providers.downloads.DownloadStorageProvider from ProcessRecord{d912193 7234:[package name]/u0a116} (pid=7234, uid=10116) requires android.permission.MANAGE_DOCUMENTS or android.permission.MANAGE_DOCUMENTS
06-25 11:46:12.938 7234-7234/? D/MediaPlayer: create failed:

Answer 1

But after i restarted the app it does not play instead returns SecurityException.

默认情况下，在您的进程的生命周期内，您只有 Uri 标识的内容的权利。将其视为与 Web 应用程序中的用户会话相关联的 URL；一旦该会话超时，URL 将不再可用。

在 API 19 级以上，您可以尝试 using takePersistableUriPermission() 以更持久地访问内容。但是，ACTION_OPEN_DOCUMENT 比 ACTION_GET_CONTENT 多，因此它可能不起作用。

Answer 2

我在尝试使用 uri 播放音频文件时也遇到了这个问题。这就是我解决它的方法。获取音频文件 uri 时，我使用 ACTION_OPEN_DOCUMENT 而不是 ACTION_GET_CONTENT，并将此行添加到 onActivityResult.

this.getContentResolver().takePersistableUriPermission(currentUri, Intent.FLAG_GRANT_READ_URI_PERMISSION | Intent.FLAG_GRANT_WRITE_URI_PERMISSION);

public void getAudioFileUri(View v) {

  Intent intent = new Intent();
  intent.setAction(Intent.ACTION_OPEN_DOCUMENT);
  intent.setType("audio/*");
  intent.addCategory(Intent.CATEGORY_OPENABLE);
  try {
    startActivityForResult(Intent.createChooser(intent, "Choose audio file"), 1);
  } catch (Exception ex) {

  }
}

public void onActivityResult(int requestCode, int resultCode, Intent resultData) {
  Uri currentUri = null;
  if (resultCode == Activity.RESULT_OK) {
    if (requestCode == 1) {
      if (resultData != null) {
        currentUri = resultData.getData();
        this.musicUri = currentUri.toString();
        this.getContentResolver().takePersistableUriPermission(currentUri, Intent.FLAG_GRANT_READ_URI_PERMISSION | Intent.FLAG_GRANT_WRITE_URI_PERMISSION);
      }
    }
  }
}

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