在android上捕獲應用程序音頻輸出

Question

我需要從其他應用程序捕獲音頻。有沒有API或程序在市場上呢？

Answer 1

不這麼認爲。您最好的選擇是將其插入帶有男性耳機和頭戴耳機的電腦中，並用大膽或類似的方式進行錄音。

Answer 2

從here到here我已經提取這一點：

package com.pravaa.audiointent; 

import java.io.DataOutputStream; 
import java.io.File; 
import java.io.FileInputStream; 
import java.io.FileNotFoundException; 
import java.io.FileOutputStream; 
import java.io.IOException; 
import java.util.Enumeration; 
import java.util.Vector; 

import android.app.Activity; 
import android.content.Intent; 
import android.os.Bundle; 
import android.os.FileObserver; 
import android.provider.MediaStore; 
import android.view.View; 
import android.view.View.OnClickListener; 
import android.widget.Button; 
import android.widget.LinearLayout; 
import android.widget.Toast; 

public class AudioActivity extends Activity implements OnClickListener { 
/** Called when the activity is first created. */ 
private Button sampleButton; 
private FileObserver mFileObserver; 
private Vector<String> audioFileNames; 

@Override 
public void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    audioFileNames = new Vector<String>(); 
    LinearLayout finalContainer = new LinearLayout(this); 
    sampleButton = new Button(this); 
    sampleButton.setOnClickListener(this); 
    sampleButton.setText("Start Audio Intent"); 
    finalContainer.addView(sampleButton); 
    setContentView(finalContainer); 
    addObserver(); 

} 

private void addObserver() { 
    this.mFileObserver = new FileObserver("/sdcard/Sounds/") { 
     @Override 
     public void onEvent(int event, String path) { 
      if (event == FileObserver.CREATE) { 
       if (path != null) { 
        int index = path.indexOf("tmp"); 
        String tempFileName = (String) path.subSequence(0, 
          index - 1); 
        audioFileNames.add(tempFileName); 

       } 
      } else if (event == FileObserver.DELETE) { 
       if (path != null) { 
        int index = path.indexOf("tmp"); 
        String tempFileName = (String) path.subSequence(0, 
          index - 1); 
        if (audioFileNames.contains(tempFileName)) { 
         audioFileNames.remove(tempFileName); 
        } 
       } 

      } 
     } 
    }; 
} 

private void readFile(String fileName) { 

    File attachment = new File("/sdcard/Sounds/" + fileName); 
    if (attachment.exists()) { 
     FileInputStream fis; 
     try { 
      fis = new FileInputStream(attachment); 
      byte[] bytes = new byte[(int) attachment.length()]; 
      try { 
       fis.read(bytes); 
       fis.close(); 

       attachment.delete(); 

       saveMedia("Test" + fileName, bytes); 

      } catch (IOException e) { 
       // TODO Auto-generated catch block 
       e.printStackTrace(); 
      } 

     } catch (FileNotFoundException e) { 
      // TODO Auto-generated catch block 
      e.printStackTrace(); 
     } 
    } 
} 

@Override 
protected void onResume() { 
    // TODO Auto-generated method stub 
    super.onResume(); 
    mFileObserver.startWatching(); 
} 

public void saveMedia(String fileName, byte[] data) { 

    String imagePath = "/sdcard/sam/"; 
    System.out.println("Inside Folder"); 


    File file = new File(imagePath, fileName); 
    System.out.println("File Created"); 

    FileOutputStream fileOutputStream = null; 
    try { 
     fileOutputStream = new FileOutputStream(file); 
     DataOutputStream dataOutputStream = new DataOutputStream(
       fileOutputStream); 
     System.out.println("Writting File"); 
     dataOutputStream.write(data, 0, data.length); 
     System.out.println("Finished writting File"); 
     dataOutputStream.flush(); 
     dataOutputStream.close(); 
    } catch (FileNotFoundException e) { 
     // TODO Auto-generated catch block 
     e.printStackTrace(); 
    } catch (IOException e) { 
     // TODO Auto-generated catch block 
     e.printStackTrace(); 
    } 
} 

public void onClick(View arg0) { 
    // TODO Auto-generated method stub 
    Intent intent = new Intent(MediaStore.Audio.Media.RECORD_SOUND_ACTION); 
    startActivityForResult(intent, 2); 
} 

@Override 
protected void onActivityResult(int requestCode, int resultCode, 
     Intent intent) { 
    // TODO Auto-generated method stub 
    if (requestCode == 2) { 
     if (mFileObserver != null) { 
      mFileObserver.stopWatching(); 
     } 
     Enumeration<String> audioFileEnum = audioFileNames.elements(); 
     while (audioFileEnum.hasMoreElements()) { 
      readFile((String) audioFileEnum.nextElement()); 
     } 
    } 
}}