如何每次按下按钮时创建克里特新文件？

我只是有关于android的基本知识。今天我开发了一个音频录制应用程序，但问题是用户可以录制音频，并且可以在第二次运行时播放音频（或者再次按下录制按钮），新录制的文件将替换存储器中的旧文件，我想为每个录音操作创建新文件，该怎么做？如何每次按下按钮时创建克里特新文件？

这是我的主要活动

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); 
} 
}

来源

2017-03-04 Jaison_Joseph

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

在你的记录按钮点击使用此行

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

如果你给相同的文件名，文件将被覆盖旧一。

来源

2017-03-04 09:01:33

使用Calendar.getInstance（）。getTimeInMillis（）为每个记录创建唯一的文件名。

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

另外创建一个函数来创建新的音频文件并用新文件引用初始化记录器。

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); 
}

现在拨打以上，从开始录音功能

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

来源

2017-03-04 08:58:08

如何每次按下按钮时创建克里特新文件？

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