Question

如何扫描从网上下载的文件？我已成功从url下载文件并将其保存到文件夹但是当我打开媒体播放器时没有媒体。经过一点点搜索，我刚刚看到帖子，下载文件后，它必须扫描。所以我尝试了类似的东西

public class TagsPlugin extends CordovaPlugin {

    private CallbackContext callbackContext;
    private static Context context;
    private MediaScannerConnection conn;

    @Override
    public boolean execute(final String action, final JSONArray args, final CallbackContext callbackContext) throws JSONException {
        this.callbackContext = callbackContext;

        final String songName = args.getString(0) + " " + myDomain;

        cordova.getActivity().runOnUiThread(new Runnable() {



            public void run() {
                    String resp;

                    final MediaScannerConnection conn;
        final String newFilePath = action;


                    String filePath = action;
                    AudioFile audioFile = null;
                    Tag audioTag = null;
                    AudioHeader audioHeader = null;

                    try{
                        TagOptionSingleton.getInstance().setAndroid(true);
                        AudioFile f = (MP3File) AudioFileIO.read(new File(filePath));
                        audioTag = f.getTag();

                        audioTag.setField(FieldKey.TITLE, songName);

                        f.commit();

                        resp = audioTag.getFirst(FieldKey.TITLE);

File file = new File(filePath);
MediaScannerConnection.scanFile(context, new String[] { file.getAbsolutePath() }, null, null);
//MediaScannerConnection.scanFile(context, new String[] { filePath }, null, null);



                    }catch (Exception e){
                        StringWriter errors = new StringWriter();
                        e.printStackTrace(new PrintWriter(errors));
                        resp = errors.toString();
                    }

                    PluginResult pluginResult = new PluginResult(PluginResult.Status.OK, resp);
                    pluginResult.setKeepCallback(true);
                    callbackContext.sendPluginResult(pluginResult);

                }

        });


        return true;

    }
}

但它显示以下错误

java.lang.NullPointerException: Attempt to invoke virtual method 'boolean android.content.Context.bindService(android.content.Intent, android.content.ServiceConnection, int)' on a null object reference
    at android.media.MediaScannerConnection.connect(MediaScannerConnection.java:119)
    at android.media.MediaScannerConnection.scanFile(MediaScannerConnection.java:238)
    at TagsPlugin$1.run(TagsPlugin.java:91)
    at android.os.Handler.handleCallback(Handler.java:739)
    at android.os.Handler.dispatchMessage(Handler.java:95)
    at android.os.Looper.loop(Looper.java:135)
    at android.app.ActivityThread.main(ActivityThread.java:5221)
    at java.lang.reflect.Method.invoke(Native Method)
    at java.lang.reflect.Method.invoke(Method.java:372)
    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:899)
    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:694)

我做错了什么？我只想在android中的媒体播放器中显示下载的歌曲。

是否有任何与我正在做的相同的phonegap / cordova插件？

Answer 1

我自己使用下面的代码完成了。

MediaScannerConnection.scanFile(this.cordova.getActivity(),
                      new String[] { filePath }, null,
                      new MediaScannerConnection.OnScanCompletedListener() {
                  public void onScanCompleted(String path, Uri uri) {
                      cbContext.sendPluginResult(new PluginResult(PluginResult.Status.OK, uri.toString()));
                  }
            });

如何使用MediaScannerConnection scanFile扫描android中的文件

1 个答案: