Android MediaRecorder示例

MediaRecorder 类可用于记录音频和视频文件。

录制媒体后，我们可以创建一个可以稍后播放的声音文件。

在这个示例中，我们将 记录音频文件 并将其存储在外部目录中，格式为3gp。

activity_main.xml

从面板拖动2个按钮，一个用于开始录制，另一个用于停止录制。在这里，我们使用 android:onClick 在xml文件中将视图注册到监听器上。

<RelativeLayout xmlns:androclass="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    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=".MainActivity" >

    <Button
        android:id="@+id/button1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentLeft="true"
        android:layout_alignParentTop="true"
        android:layout_marginLeft="68dp"
        android:layout_marginTop="50dp"
        android:text="Start Recording"
        android:onClick="startRecording"
         />

    <Button
        android:id="@+id/button2"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignLeft="@+id/button1"
        android:layout_below="@+id/button1"
        android:layout_marginTop="64dp"
        android:text="Stop Recording" 
        android:onClick="stopRecording"
        />

</RelativeLayout>

Activity类

package com.javatpoint.mediarecorder;
import java.io.File;
import java.io.IOException;
import android.app.Activity;
import android.content.ContentResolver;
import android.content.ContentValues;
import android.content.Intent;
import android.media.MediaRecorder;
import android.net.Uri;
import android.os.Bundle;
import android.os.Environment;
import android.provider.MediaStore;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.Toast;

public class MainActivity extends Activity {
      MediaRecorder recorder;
      File audiofile = null;
      static final String TAG = "MediaRecording";
      Button startButton,stopButton;

      @Override
      public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        startButton = (Button) findViewById(R.id.button1);
        stopButton = (Button) findViewById(R.id.button2);
      }

      public void startRecording(View view) throws IOException {
        startButton.setEnabled(false);
        stopButton.setEnabled(true);
            //Creating file
        File dir = Environment.getExternalStorageDirectory();
        try {
          audiofile = File.createTempFile("sound", ".3gp", dir);
        } catch (IOException e) {
          Log.e(TAG, "external storage access error");
          return;
        }
            //Creating MediaRecorder and specifying audio source, output format, encoder & output format
        recorder = new MediaRecorder();
        recorder.setAudioSource(MediaRecorder.AudioSource.MIC);
        recorder.setOutputFormat(MediaRecorder.OutputFormat.THREE_GPP);
        recorder.setAudioEncoder(MediaRecorder.AudioEncoder.AMR_NB);
        recorder.setOutputFile(audiofile.getAbsolutePath());
        recorder.prepare();
        recorder.start();
      }

      public void stopRecording(View view) {
        startButton.setEnabled(true);
        stopButton.setEnabled(false);
            //stopping recorder
        recorder.stop();
        recorder.release();
           //after stopping the recorder, create the sound file and add it to media library.
        addRecordingToMediaLibrary();
      }

      protected void addRecordingToMediaLibrary() {
            //creating content values of size 4
        ContentValues values = new ContentValues(4);
        long current = System.currentTimeMillis();
        values.put(MediaStore.Audio.Media.TITLE, "audio" + audiofile.getName());
        values.put(MediaStore.Audio.Media.DATE_ADDED, (int) (current / 1000));
        values.put(MediaStore.Audio.Media.MIME_TYPE, "audio/3gpp");
        values.put(MediaStore.Audio.Media.DATA, audiofile.getAbsolutePath());

             //creating content resolver and storing it in the external content uri
        ContentResolver contentResolver = getContentResolver();
        Uri base = MediaStore.Audio.Media.EXTERNAL_CONTENT_URI;
        Uri newUri = contentResolver.insert(base, values);

           //sending broadcast message to scan the media file so that it can be available
        sendBroadcast(new Intent(Intent.ACTION_MEDIA_SCANNER_SCAN_FILE, newUri));
        Toast.makeText(this, "Added File " + newUri, Toast.LENGTH_LONG).show();
      }
    } 

下载这个 MediaRecorder 示例

输出：