通過在android項目中使用MediaRecorder實現一個錄音功能

package com.centaur.collectvoice;

import android.media.MediaRecorder;
import android.os.Environment;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Toast;

import java.io.File;
import java.io.IOException;

public class MainActivity extends AppCompatActivity {

  private final static String TAG = "collectvoice";
  MediaRecorder mediaRecorder = new MediaRecorder();

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

  }

  /**
   * 開始按鈕
   * @param view
   * @throws IOException
   */
  public void onStart(View view) throws IOException {
    Toast.makeText(this, "開始收集", Toast.LENGTH_SHORT).show();
    // 第1步：設置音頻來源（MIC表示麥克風）
    mediaRecorder.setAudioSource(MediaRecorder.AudioSource.MIC);
    //第2步：設置音頻輸出格式（默認的輸出格式）
    mediaRecorder.setOutputFormat(MediaRecorder.OutputFormat.DEFAULT);
    //第3步：設置音頻編碼方式（默認的編碼方式）
    mediaRecorder.setAudioEncoder(MediaRecorder.AudioEncoder.DEFAULT);
    //創建一個臨時的音頻輸出文件
//    audioFile = File.createTempFile("record_", ".amr");
    if (FileUtils.makeFolder("VOICE")){//一個簡單的判斷文件夾是不是存在 不存在就創建
      String path = Environment.getExternalStorageDirectory().toString() + "/" + "VOICE/";
      String filePath =path+"record_.amr";
      File file = new File(filePath);
      //第4步：指定音頻輸出文件
      mediaRecorder.setOutputFile(file.getAbsolutePath());
      //第5步：調用prepare方法
      mediaRecorder.prepare();
      //第6步：調用start方法開始錄音
      mediaRecorder.start();
    }
  }

  /**
   * 關閉按鈕
   * @param view
   */
  public void onStop(View view) {
    Toast.makeText(this, "停止收集", Toast.LENGTH_SHORT).show();
    mediaRecorder.stop();
  }
}

 public static boolean makeFolder(String folder){
    File filefolder = new File(Environment.getExternalStorageDirectory().toString() + "/" + folder);
    if(!filefolder.exists()){
      filefolder.mkdir();
      if(filefolder.exists()){
        Log.d(TAG,folder+"創建成功");
      }
      else {
        Log.d(TAG,folder+"創建失敗");
      }

    }
    return true;
  }

<&#63;xml version="1.0" encoding="utf-8"&#63;>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
  xmlns:tools="http://schemas.android.com/tools"
  android:id="@+id/activity_main"
  android:layout_width="match_parent"
  android:layout_height="match_parent"
  android:orientation="vertical"
  android:paddingBottom="@dimen/activity_vertical_margin"
  android:paddingLeft="@dimen/activity_horizontal_margin"
  android:paddingRight="@dimen/activity_horizontal_margin"
  android:paddingTop="@dimen/activity_vertical_margin"
  tools:context="com.centaur.collectvoice.MainActivity">

  <Button
    android:onClick="onStart"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:text="收集聲音" />

  <Button
    android:onClick="onStop"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:text="停止聲音" />

</LinearLayout>