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Android自带的SoundRecoder软件写得很简单,就3个Java文件,最有特色的还算哪个指针了。这里并不是要介绍那个个指针的实现过程,其实也简单,就是一个算法,通过录音过程中获取的振幅来实现指针的偏移。MediaRecorder.getMaxAmplitude(); // 得到录音时的最大振幅
赶紧上代码吧,两分钟的时间马上就过了...界面设计很简单,3个按钮(开始录音,停止录音,播放录音)。
一、新建工程SoundRecoderDemo
二、main.xml(布局文件)
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"android:layout_width="fill_parent"android:layout_height="fill_parent"android:orientation="horizontal" ><Buttonandroid:id="@+id/start"android:layout_width="wrap_content"android:layout_height="wrap_content"android:layout_weight="1"android:text="start" /><Buttonandroid:id="@+id/stop"android:layout_width="wrap_content"android:layout_height="wrap_content"android:layout_weight="1"android:text="stop" /><Buttonandroid:id="@+id/play"android:layout_width="wrap_content"android:layout_height="wrap_content"android:layout_weight="1"android:text="play" /></LinearLayout>
三、SoundRecorderActivity(具体录音实现)
import java.io.File;
import java.io.IOException;import android.app.Activity;
import android.media.MediaRecorder;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;public class SoundRecorderActivity extends Activity implements OnClickListener {private Button btnStart;private Button btnStop;private Button btnPlay;private MediaRecorder mMediaRecorder;private File recAudioFile;private MusicPlayer mPlayer;@Overridepublic void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.main);setupViews();}private void setupViews() {btnStart = (Button) findViewById(R.id.start);btnStop = (Button) findViewById(R.id.stop);btnPlay = (Button) findViewById(R.id.play);btnStart.setOnClickListener(this);btnStop.setOnClickListener(this);btnPlay.setOnClickListener(this);recAudioFile = new File("/mnt/sdcard", "new.amr");}@Overridepublic void onClick(View v) {switch (v.getId()) {case R.id.start:startRecorder();break;case R.id.stop:stopRecorder();break;case R.id.play:mPlayer = new MusicPlayer(SoundRecorderActivity.this);mPlayer.playMicFile(recAudioFile);break;default:break;}}private void startRecorder() {mMediaRecorder = new MediaRecorder();if (recAudioFile.exists()) {recAudioFile.delete();}mMediaRecorder.setAudioSource(MediaRecorder.AudioSource.MIC); mMediaRecorder.setOutputFormat(MediaRecorder.OutputFormat.DEFAULT);mMediaRecorder.setAudioEncoder(MediaRecorder.AudioEncoder.DEFAULT);mMediaRecorder.setOutputFile(recAudioFile.getAbsolutePath());try {mMediaRecorder.prepare();} catch (IllegalStateException e) {e.printStackTrace();} catch (IOException e) {e.printStackTrace();}mMediaRecorder.start();}private void stopRecorder(){if (recAudioFile!=null) {mMediaRecorder.stop();mMediaRecorder.release();}}
}
四、播放类(MusicPlayer)
import java.io.File;import android.content.Context;
import android.media.MediaPlayer;
import android.media.MediaPlayer.OnCompletionListener;
import android.net.Uri;
import android.util.Log;public class MusicPlayer {private final static String TAG = "MusicPlayer";private static MediaPlayer mMediaPlayer;private Context mContext;public MusicPlayer(Context context){mContext = context;}public void playMicFile(File file){if (file!=null && file.exists()) {Uri uri = Uri.fromFile(file);mMediaPlayer = MediaPlayer.create(mContext, uri);mMediaPlayer.start(); mMediaPlayer.setOnCompletionListener(new OnCompletionListener() {public void onCompletion(MediaPlayer mp) {//TODO:finish Log.i(TAG, "Finish");}});}}public void stopPlayer(){if(mMediaPlayer.isPlaying()){mMediaPlayer.stop();mMediaPlayer.release();}}
}
五、添加录音权限
<uses-permission android:name="android.permission.RECORD_AUDIO" />
<uses-permission android:name="android.permission.WAKE_LOCK" />
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
完成,运行查看效果。代码很简单,没有注释,感兴趣的看API!!
Demo下载地址:http://download.csdn.net/detail/tangcheng_ok/3837435
原创文章,转载请注明出处:htttp://www.blog.csdn.net/tangcheng_ok
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