每次按下按钮时如何创建创建新文件？

Question

我对android只有基本的了解。今天我开发了一个录音应用程序，但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（或用户再次按下录音按钮）新录制的文件替换存储中的旧文件，我想为每一次录音操作创建新文件，怎么办？

这是我的主要activity

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";

同时创建一个函数来创建新的音频文件并使用新的文件引用初始化录音机。

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);
}

现在从开始录制调用上面的函数

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";

如果您给相同的文件名，该文件将覆盖旧文件。

每次按下按钮时如何创建创建新文件？

how to create Crete new file every time when the button presses?

storage

android

file

audio-recording