使用MediaPlayer实现简单的录音

1.布局文件 activity_main.xml

<?xml version="1.0" encoding="utf-8"?><RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"    xmlns:tools="http://schemas.android.com/tools"    android:layout_width="match_parent"    android:layout_height="match_parent"    tools:context="com.ebeijia.audiotest.MainActivity">    <TextView        android:id="@+id/textView1"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:layout_alignParentLeft="true"        android:layout_alignParentRight="true"        android:layout_alignParentTop="true"        android:layout_marginTop="32dp"        android:text="@string/Recording"        android:textAppearance="?android:attr/textAppearanceMedium" />    <ImageView        android:id="@+id/imageView1"        android:layout_width="100dp"        android:layout_height="100dp"        android:layout_below="@+id/textView1"        android:layout_centerHorizontal="true"        android:layout_marginTop="37dp"        android:scaleType="fitXY"        android:src="@android:drawable/presence_audio_online" />    <Button        android:id="@+id/button1"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:layout_below="@+id/imageView1"        android:layout_marginTop="67dp"        android:layout_toLeftOf="@+id/imageView1"        android:onClick="start"        android:text="@string/start" />    <Button        android:id="@+id/button2"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:layout_alignBaseline="@+id/button1"        android:layout_alignBottom="@+id/button1"        android:layout_alignRight="@+id/textView1"        android:layout_marginRight="40dp"        android:onClick="stop"        android:text="@string/stop" />    <Button        android:id="@+id/button3"        style="?android:attr/buttonStyleSmall"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:layout_below="@+id/button2"        android:layout_centerHorizontal="true"        android:onClick="play"        android:text="@string/play" /></RelativeLayout>

三个按钮分别用于开始录音、停止录音、播放已经录好的录音。

2.实现

import android.media.MediaPlayer;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.Button;import android.widget.Toast;import java.io.IOException;public class MainActivity extends AppCompatActivity {    private MediaRecorder myAudioRecorder;    private String outputFile = null;    private Button start,stop,play;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        init(); //进行初始化操作    }    //进行一些初始化工作    public void init()    {          start = (Button)findViewById(R.id.button1);        stop = (Button)findViewById(R.id.button2);        play = (Button)findViewById(R.id.button3);         stop.setEnabled(false);        play.setEnabled(false);        //录音录完存放的地址        outputFile = Environment.getExternalStorageDirectory().                getAbsolutePath() + "/myrecording.3gp";;        myAudioRecorder = new MediaRecorder();        myAudioRecorder.setAudioSource(MediaRecorder.AudioSource.MIC);        myAudioRecorder.setOutputFormat(MediaRecorder.OutputFormat.THREE_GPP);        myAudioRecorder.setAudioEncoder(MediaRecorder.OutputFormat.AMR_NB);        myAudioRecorder.setOutputFile(outputFile);    }    //开始录音，这里需要捕获IO异常    public void start(View view){        try {            myAudioRecorder.prepare();            myAudioRecorder.start();        } catch (IllegalStateException e) {            // TODO Auto-generated catch block            e.printStackTrace();        } catch (IOException e) {            // TODO Auto-generated catch block            e.printStackTrace();        }        start.setEnabled(false);        stop.setEnabled(true);        Toast.makeText(getApplicationContext(), "Recording started", Toast.LENGTH_LONG).show();    }    //停止录音    public void stop(View view){        myAudioRecorder.stop();        myAudioRecorder.release();        myAudioRecorder  = null;        stop.setEnabled(false);        play.setEnabled(true);        Toast.makeText(getApplicationContext(), "Audio recorded successfully",                Toast.LENGTH_LONG).show();    }    //播放录好的录音 这里给MediaPlayer设置了一个监听器，只有当录音播放完毕之后，才能开始下一次的播放    public void play(View view) throws IllegalArgumentException,            SecurityException, IllegalStateException, IOException{        MediaPlayer m = new MediaPlayer();        m.setDataSource(outputFile);        m.prepare();        m.start();        play.setEnabled(false);        m.setOnCompletionListener(new MediaPlayer.OnCompletionListener() {            @Override            public void onCompletion(MediaPlayer mp) {                play.setEnabled(true);            }        });        Toast.makeText(getApplicationContext(), "Playing audio", Toast.LENGTH_LONG).show();    }}