合并mp3文件FileNotFoundException

Question

我需要合并两个mp3文件(端到端，而不是混合在一起)。这些文件位于res/raw文件夹中。当我使用Media Player播放它们时，它们会工作，但是当我试图合并它们时，我会得到以下错误：

java.io.FileNotFoundException: /android.content.res.AssetManager$AssetInputStream@65561058: open failed: ENOENT (No such file or directory)

我已经试了好几个小时了。我想我一定是给FileInputStream提供了错误的格式或什么的，但问题似乎是在别的地方，包括找不到文件或不允许访问目录或其他什么东西。我意识到在这个网站上有许多类似的问题，但是我已经看了无数的问题，但仍然没有找到解决办法。

以下是代码：

    Handler handler=new Handler();
    handler.postDelayed(new Runnable() {

      @Override
      public void run() {

          File first =  new File(getResources().openRawResource(R.raw.file101).toString());
          File second = new File(getResources().openRawResource(R.raw.file103).toString());

          String filepath = Environment.getExternalStorageDirectory().getPath();
          File file = new File(filepath, "myapp");
          mergeSongs(new File(file.getAbsoluteFile()+"/mergedFile.mp3"), new File[] {first, second});

      }
  },2000);


private void mergeSongs(File mergedFile,File...mp3Files){

    try {
        FileInputStream fis1 = new FileInputStream(mp3Files[0]); //Error is at this line
        FileInputStream fis2 = new FileInputStream(mp3Files[1]);
        Toast.makeText(MainActivity.this, mp3Files[0].toString()+mp3Files[1].toString(), Toast.LENGTH_LONG).show();
        SequenceInputStream sis = new SequenceInputStream(fis1,fis2);

        if(!mergedFile.exists()){
            mergedFile.createNewFile();}

        FileOutputStream fos = new FileOutputStream(mergedFile);

        int temp;

         while ((temp = sis.read())!= -1){

                fos.write((byte)temp);

            }

         fis1.close();
         fis2.close();
         sis.close();
         fos.close();
        } catch (IOException e) {
            e.printStackTrace();
        }

}

新错误：

11-11 11:46:14.180: W/System.err(23975): java.io.IOException: open failed: ENOENT (No such file or directory)
11-11 11:46:14.180: W/System.err(23975):    at java.io.File.createNewFile(File.java:946)
11-11 11:46:14.180: W/System.err(23975):    at com.myapp.MainActivity.mergeSongs(MainActivity.java:311)
11-11 11:46:14.180: W/System.err(23975):    at com.myapp.MainActivity.access$7(MainActivity.java:300)
11-11 11:46:14.180: W/System.err(23975):    at com.myapp.MainActivity$8.run(MainActivity.java:290)

Answer 1

将您的FileInputStreams更改为InputStreams，并使其如下所示：

getResources().openRawResource(R.raw.file101)；= InputStream

    Handler handler=new Handler();
    handler.postDelayed(new Runnable() {

      @Override
      public void run() {

          InputStream first =  getResources().openRawResource(R.raw.file101);
          InputStream second = getResources().openRawResource(R.raw.file103);

          String filepath = Environment.getExternalStorageDirectory().getPath();
          File file = new File(filepath, "myapp");
          mergeSongs(new File(file.getAbsoluteFile()+"/mergedFile.mp3"), new InputStream[] {first, second});

      }
  },2000);


private void mergeSongs(File mergedFile,InputStream...mp3InputStream){

    try {
        InputStream fis1 = mp3InputStream[0]; //Error is at this line
        InputStream fis2 = mp3InputStream[1];
        Toast.makeText(MainActivity.this, "Something", Toast.LENGTH_LONG).show();
        SequenceInputStream sis = new SequenceInputStream(fis1,fis2);

        if(!mergedFile.exists()){
            mergedFile.createNewFile();}

        FileOutputStream fos = new FileOutputStream(mergedFile);

        int temp;

         while ((temp = sis.read())!= -1){

                fos.write((byte)temp);

            }

         fis1.close();
         fis2.close();
         sis.close();
         fos.close();
        } catch (IOException e) {
            e.printStackTrace();
        }

}

新错误：

11-11 11:46:14.180: W/System.err(23975): java.io.IOException: open failed: ENOENT (No such file or directory)
11-11 11:46:14.180: W/System.err(23975):    at java.io.File.createNewFile(File.java:946)
11-11 11:46:14.180: W/System.err(23975):    at com.myapp.MainActivity.mergeSongs(MainActivity.java:311)
11-11 11:46:14.180: W/System.err(23975):    at com.myapp.MainActivity.access$7(MainActivity.java:300)
11-11 11:46:14.180: W/System.err(23975):    at com.myapp.MainActivity$8.run(MainActivity.java:290)