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android mediarecorder例子

MediaRecorder类可用于记录音频和视频文件。

录制媒体后,我们可以创建一个声音文件,以便以后播放。

在此示例中,我们将记录音频文件并将其以3gp格式存储在外部目录中。

activity_main.xml

从面板上拖动2个按钮,一个开始录制,另一个停止录制。在这里,我们使用android:onClick在xml文件中向侦听器注册视图。

<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>

活动类

package com.srcmini.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();
	  }
	}


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