加入MP3文件 – 将Java代码转换为Android

我正在尝试制作一个可以加入2个MP3文件并将其保存在android SD卡上的程序。 我有Java代码工作，但当我尝试将其转换为Android时，它会产生一些错误。

在Java代码中写道如下。 它的工作完美。

import java.io.*; public class TuneDoorJava { public static void main(String[] args) throws FileNotFoundException, IOException { FileInputStream fistream1 = new FileInputStream("F:\\aa.mp3"); // first source file FileInputStream fistream2 = new FileInputStream("F:\\bb.mp3");//second source file SequenceInputStream sistream = new SequenceInputStream(fistream1, fistream2); FileOutputStream fostream = new FileOutputStream("F:\\final.mp3");//destinationfile int temp; while( ( temp = sistream.read() ) != -1) { // System.out.print( (char) temp ); // to print at DOS prompt fostream.write(temp); // to write to file } fostream.close(); sistream.close(); fistream1.close(); fistream2.close(); } } 

在Android中，我要做的是：

 public class MainActivity extends Activity { @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); // FileOutputStream fostream=null; FileInputStream fist=(FileInputStream)getResources().openRawResource(R.raw.t); FileInputStream fist2=(FileInputStream)getResources().openRawResource(R.raw.v); File sdCard = Environment.getExternalStorageDirectory(); File dir = new File (sdCard.getAbsolutePath() + "/dir1"); dir.mkdirs(); File file = new File(dir, "filename"); //FileInputStream fistream1 = new FileInputStream(); // first source file //FileInputStream fistream2 = new FileInputStream("F:\\bb.mp3");//second source file SequenceInputStream sistream = new SequenceInputStream(fist, fist2); FileOutputStream fostream = new FileOutputStream(file); int temp; while( ( temp = sistream.read() ) != -1) { // System.out.print( (char) temp ); // to print at DOS prompt fostream.write(temp); // to write to file } fostream.close(); sistream.close(); fistream1.close(); fistream2.close(); } } 

Answer 1

–授予此权限WRITE_EXTERNAL_STORAGE

这是我项目的工作代码：

 public class ConcateSongActivity extends Activity { Button mbutt; /** Called when the activity is first created. */ @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); mbutt = (Button)findViewById(R.id.button_Click_Karo); mbutt.setOnClickListener(new OnClickListener() { @Override public void onClick(View arg0) { try { FileInputStream fis1 = new FileInputStream("/sdcard/viv0.wav"); FileInputStream fis2 = new FileInputStream("/sdcard/viv1.wav"); SequenceInputStream sis = new SequenceInputStream(fis1,fis2); FileOutputStream fos = new FileOutputStream(new File("/sdcard/vis.wav")); int temp; try { while ((temp = sis.read())!= -1){ fos.write(temp); } } catch (IOException e) { // TODO Auto-generated catch block e.printStackTrace(); } } catch (FileNotFoundException e) { // TODO Auto-generated catch block e.printStackTrace(); } } }); } } 

Answer 2

您需要通过将以下行添加到您的Manifest，为您的应用程序授予写入SD卡的权限：