如何每次按下按鈕時創建克里特新文件？

我只是有關於android的基本知識。今天我開發了一個音頻錄製應用程序，但問題是用戶可以錄製音頻，並且可以在第二次運行時播放音頻（或者再次按下錄製按鈕），新錄製的文件將替換存儲器中的舊文件，我想爲每個錄音操作創建新文件，該怎麼做？如何每次按下按鈕時創建克里特新文件？

這是我的主要活動

package com.hackerinside.jaisonjoseph.sample_recorder; 

    import android.media.MediaPlayer; 
    import android.media.MediaRecorder; 
    import android.os.Bundle; 
    import android.os.Environment; 
    import android.provider.MediaStore; 
    import android.support.design.widget.FloatingActionButton; 
    import android.support.design.widget.Snackbar; 
    import android.support.v7.app.AppCompatActivity; 
    import android.support.v7.widget.Toolbar; 
    import android.view.View; 
    import android.view.Menu; 
    import android.view.MenuItem; 
    import android.widget.Button; 
    import android.widget.Toast; 

    import java.io.IOException; 

public class MainActivity extends AppCompatActivity { 

private Button play,stop,record; 
private MediaRecorder myAudioRecorder; 
private String outputfile; 


@Override 
protected void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.activity_main); 

    play=(Button)findViewById(R.id.play); 
    stop=(Button)findViewById(R.id.stop); 
    record=(Button)findViewById(R.id.record); 
    stop.setEnabled(false); 
    play.setEnabled(false); 


    outputfile= Environment.getExternalStorageDirectory().getAbsolutePath()+"/recording.mp3"; 


    myAudioRecorder=new MediaRecorder(); 
    myAudioRecorder.setAudioSource(MediaRecorder.AudioSource.MIC); 
    myAudioRecorder.setOutputFormat(MediaRecorder.OutputFormat.THREE_GPP); 
    myAudioRecorder.setAudioEncoder(MediaRecorder.OutputFormat.AMR_NB); 
    myAudioRecorder.setOutputFile(outputfile); 


record.setOnClickListener(new View.OnClickListener() { 
    @Override 
    public void onClick(View view) { 

     try { 

      myAudioRecorder.prepare(); 
      myAudioRecorder.start(); 
    } 
    catch (IllegalStateException ise){ 



    }catch (IOException ioe){ 



     } 
      record.setEnabled(false); 
      stop.setEnabled(true); 
      Toast.makeText(getApplicationContext(),"record startded",Toast.LENGTH_LONG).show(); 

    } 

}); 





    stop.setOnClickListener(new View.OnClickListener() { 
     @Override 
     public void onClick(View view) { 



      myAudioRecorder.stop(); 
      record.setEnabled(true); 
      myAudioRecorder.release(); 
      myAudioRecorder=null; 
      stop.setEnabled(false); 
      play.setEnabled(true); 
      Toast.makeText(getApplicationContext(),"recorded audio",Toast.LENGTH_LONG).show(); 

     } 

    }); 
      play.setOnClickListener(new View.OnClickListener() { 
       @Override 
       public void onClick(View view) { 
        MediaPlayer mediaPlayer=new MediaPlayer(); 

        try { 
          mediaPlayer.setDataSource(outputfile); 
          mediaPlayer.prepare(); 
          mediaPlayer.start(); 
          Toast.makeText(getApplicationContext(),"playing audio",Toast.LENGTH_LONG).show(); 
    } 
    catch (Exception e) 
    { 
// here 
    } 

} 
    }); 








    Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar); 
    setSupportActionBar(toolbar); 

    FloatingActionButton fab = (FloatingActionButton) findViewById(R.id.fab); 
    fab.setOnClickListener(new View.OnClickListener() { 
     @Override 
     public void onClick(View view) { 
      Snackbar.make(view, "Replace with your own action", Snackbar.LENGTH_LONG) 
        .setAction("Action", null).show(); 
     } 
    }); 
} 

@Override 
public boolean onCreateOptionsMenu(Menu menu) { 
    // Inflate the menu; this adds items to the action bar if it is present. 
    getMenuInflater().inflate(R.menu.menu_main, menu); 
    return true; 











} 

@Override 
public boolean onOptionsItemSelected(MenuItem item) { 
    // Handle action bar item clicks here. The action bar will 
    // automatically handle clicks on the Home/Up button, so long 
    // as you specify a parent activity in AndroidManifest.xml. 
    int id = item.getItemId(); 

    //noinspection SimplifiableIfStatement 
    if (id == R.id.action_settings) { 
     return true; 
    } 

    return super.onOptionsItemSelected(item); 
} 
}

來源

2017-03-04 Jaison_Joseph

[如何在Android中創建文件？]的可能重複（http://stackoverflow.com/questions/1239026/how-to-create-a-file-in-android） – Sufian

在你的記錄按鈕點擊使用此行

outputfile= Environment.getExternalStorageDirectory().getAbsolutePath()+"/recording_"+System.currentTimeMillis()+".mp3";

如果你給相同的文件名，文件將被覆蓋舊一。

來源

2017-03-04 09:01:33

使用Calendar.getInstance（）。getTimeInMillis（）爲每個記錄創建唯一的文件名。

outputfile=Environment.getExternalStorageDirectory().getAbsolutePath()+"/recording_"+ Calendar.getInstance().getTimeInMillis()+".mp3";

另外創建一個函數來創建新的音頻文件並用新文件引用初始化記錄器。

private void prepareNewRecording() { 
    outputfile=Environment.getExternalStorageDirectory().getAbsolutePath()+"/recording_"+ Calendar.getInstance().getTimeInMillis()+".mp3"; 
    myAudioRecorder=newMediaRecorder(); 
    myAudioRecorder.setAudioSource(MediaRecorder.AudioSource.MIC); 
    myAudioRecorder.setOutputFormat(MediaRecorder.OutputFormat.THREE_GPP); 
    myAudioRecorder.setAudioEncoder(MediaRecorder.OutputFormat.AMR_NB); 
    myAudioRecorder.setOutputFile(outputfile); 
}

現在撥打以上，從開始錄音功能

prepareNewRecording(); 
myAudioRecorder.prepare(); 
myAudioRecorder.start();

來源

2017-03-04 08:58:08

如何每次按下按鈕時創建克里特新文件？

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