每次按下按钮时如何创建Crete新文件？

Question

我只有关于android的基本知识。 今天，我开发了一个音频录制应用程序，但是问题是用户可以录制音频并且可以播放音频，当它第二次运行时（或者用户再次按下录制按钮），新录制的文件将替换为存储中的旧文件。 ，我想为每个记录操作创建一个新文件，怎么办？

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);
}
}

Answer 1

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";

还创建一个功能来创建新的音频文件，并使用新的文件引用来初始化记录器。

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);
}

现在从开始录制时调用上述功能

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

Answer 2

在您的记录按钮上，单击使用此行

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

如果您提供相同的文件名，则该文件将被旧文件覆盖。