Android实现多媒体录音笔

package com.example.recorder; 
 
import android.app.Activity; 
import android.app.AlertDialog; 
import android.app.AlertDialog.Builder; 
import android.content.DialogInterface; 
import android.media.MediaPlayer; 
import android.media.MediaRecorder; 
import android.os.Bundle; 
import android.os.Environment; 
import android.view.LayoutInflater; 
import android.view.View; 
import android.view.View.OnClickListener; 
import android.view.ViewGroup; 
import android.widget.AdapterView; 
import android.widget.BaseAdapter; 
import android.widget.Button; 
import android.widget.EditText; 
import android.widget.LinearLayout; 
import android.widget.ListView; 
import android.widget.TextView; 
import android.widget.Toast; 
 
import java.io.File; 
import java.io.IOException; 
 
public class MainActivity extends Activity implements OnClickListener { 
 
  private Button start; 
  private Button stop; 
  private ListView listView; 
  ShowRecorderAdpter showRecord; 
 
  // 录音文件播放 
  // 录音 
  // 音频文件保存地址 
  private MediaPlayer myPlayer; 
  private MediaRecorder myRecorder = null; 
  private String path; 
  private File saveFilePath; 
  // 所录音的文件名 
  String[] listFile = null; 
 
 
  @Override 
  protected void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.activity_main); 
 
    //初始化控件 
    InitView(); 
 
  } 
 
  private void InitView() { 
    start = (Button) findViewById(R.id.start); 
    stop = (Button) findViewById(R.id.stop); 
    listView = (ListView) findViewById(R.id.list); 
 
    myPlayer = new MediaPlayer(); 
    showRecord = new ShowRecorderAdpter(); 
 
    //如果手机有sd卡 
    if (Environment.getExternalStorageState().equals( 
        Environment.MEDIA_MOUNTED)) { 
      try { 
        path = Environment.getExternalStorageDirectory() 
            .getCanonicalPath().toString() 
            + "/MyRecorders"; 
        File files = new File(path); 
        if (!files.exists()) { 
          //如果有没有文件夹就创建文件夹 
          files.mkdir(); 
        } 
        listFile = files.list(); 
      } catch (IOException e) { 
        e.printStackTrace(); 
      } 
    } 
 
    start.setOnClickListener(this); 
    stop.setOnClickListener(this); 
    listView.setAdapter(showRecord); 
 
 
  } 
 
 
  //由于在item中涉及到了控件的点击效果，所以采用BaseAdapter 
  class ShowRecorderAdpter extends BaseAdapter { 
 
    @Override 
    public int getCount() { 
      return listFile.length; 
    } 
 
    @Override 
    public Object getItem(int arg0) { 
      return arg0; 
    } 
 
    @Override 
    public long getItemId(int arg0) { 
      return arg0; 
 
    } 
 
    @Override 
    public View getView(final int postion, View arg1, ViewGroup arg2) { 
      View views = LayoutInflater.from(MainActivity.this).inflate( 
          R.layout.list_item, null); 
      LinearLayout parent = (LinearLayout) views.findViewById(R.id.list_parent); 
      TextView filename = (TextView) views.findViewById(R.id.show_file_name); 
      Button plays = (Button) views.findViewById(R.id.bt_list_play); 
      Button stop = (Button) views.findViewById(R.id.bt_list_stop); 
 
      //在textview中显示的时候把“.amr”去掉 
      filename.setText(listFile[postion].substring(0, listFile[postion].length() - 4)); 
      parent.setOnLongClickListener(new View.OnLongClickListener() { 
        @Override 
        public boolean onLongClick(View view) { 
          AlertDialog aler = new AlertDialog.Builder(MainActivity.this) 
              .setTitle("确定删除该录音？") 
              .setPositiveButton("确定", new DialogInterface.OnClickListener() { 
                @Override 
                public void onClick(DialogInterface dialog 
                    , int which) { 
                  File file = new File(path + "/" + listFile[postion]); 
                  file.delete(); 
                  // 在删除文件后刷新文件名列表 
                  File files = new File(path); 
                  listFile = files.list(); 
 
                  // 当文件被删除刷新ListView 
                  showRecord.notifyDataSetChanged(); 
                } 
              }) 
              .setNegativeButton("取消", null) 
              .create(); 
          //设置不允许点击提示框之外的区域 
          aler.setCanceledOnTouchOutside(false); 
          aler.show(); 
          return false; 
        } 
      }); 
      // 播放录音 
      plays.setOnClickListener(new OnClickListener() { 
        @Override 
        public void onClick(View arg0) { 
          //确认不是在录音的过程中播放 
          if (myRecorder == null) { 
            try { 
              myPlayer.reset(); 
              myPlayer.setDataSource(path + "/" + listFile[postion]); 
              if (!myPlayer.isPlaying()) { 
                myPlayer.prepare(); 
                myPlayer.start(); 
              } else { 
                myPlayer.pause(); 
              } 
 
            } catch (IOException e) { 
              e.printStackTrace(); 
            } 
          } else { 
            Toast.makeText(MainActivity.this, "请不要再录音的过程中播放！", Toast.LENGTH_SHORT).show(); 
          } 
        } 
      }); 
      // 停止播放 
      stop.setOnClickListener(new OnClickListener() { 
 
        @Override 
        public void onClick(View arg0) { 
          if (myRecorder == null && myPlayer.isPlaying()) { 
            myPlayer.stop(); 
          } 
        } 
      }); 
      return views; 
    } 
 
  } 
 
  @Override 
  public void onClick(View v) { 
    switch (v.getId()) { 
      case R.id.start: 
        final EditText filename = new EditText(this); 
        AlertDialog aler = new Builder(this) 
            .setTitle("请输入要保存的文件名") 
            .setView(filename) 
            .setPositiveButton("确定", 
                new DialogInterface.OnClickListener() { 
                  @Override 
                  public void onClick(DialogInterface dialog, 
                            int which) { 
                    String text = filename.getText().toString(); 
                    //如果文件名为空则跳出提示信息 
                    if (text.equals("")) { 
                      Toast.makeText(MainActivity.this, 
                          "请不要输入空的文件名!", Toast.LENGTH_SHORT).show(); 
                    } else { 
                      //开启录音 
                      RecorderStart(text); 
 
                      start.setText("正在录音中。。"); 
                      start.setEnabled(false); 
                      stop.setEnabled(true); 
                      // 在增添文件后刷新文件名列表 
                      File files = new File(path); 
                      listFile = files.list(); 
                      // 当文件增加刷新ListView 
                      showRecord.notifyDataSetChanged(); 
                    } 
                  } 
                }) 
            .setNegativeButton("取消",null) 
            .create(); 
        //设置不允许点击提示框之外的区域 
        aler.setCanceledOnTouchOutside(false); 
        aler.show(); 
        break; 
      case R.id.stop: 
        myRecorder.stop(); 
        myRecorder.release(); 
        myRecorder = null; 
        // 判断是否保存 如果不保存则删除 
        aler = new AlertDialog.Builder(this) 
            .setTitle("是否保存该录音") 
            .setPositiveButton("确定", null) 
            .setNegativeButton("取消", 
                new DialogInterface.OnClickListener() { 
                  @Override 
                  public void onClick(DialogInterface dialog, 
                            int which) { 
                    saveFilePath.delete(); 
                    // 在删除文件后刷新文件名列表 
                    File files = new File(path); 
                    listFile = files.list(); 
 
                    // 当文件被删除刷新ListView 
                    showRecord.notifyDataSetChanged(); 
                  } 
                }).create(); 
        //设置不允许点击提示框之外的区域 
        aler.setCanceledOnTouchOutside(false); 
        aler.show(); 
 
        start.setText("录音"); 
        start.setEnabled(true); 
        stop.setEnabled(false); 
      default: 
        break; 
    } 
 
  } 
 
  private void RecorderStart(String text) { 
    try { 
      myRecorder = new MediaRecorder(); 
      // 从麦克风源进行录音 
      myRecorder.setAudioSource(MediaRecorder.AudioSource.DEFAULT); 
      // 设置输出格式 
      myRecorder.setOutputFormat(MediaRecorder.OutputFormat.DEFAULT); 
      // 设置编码格式 
      myRecorder.setAudioEncoder(MediaRecorder.AudioEncoder.DEFAULT); 
 
      String paths = path + "/" + text + ".amr"; 
      saveFilePath = new File(paths); 
      myRecorder.setOutputFile(saveFilePath.getAbsolutePath()); 
      myRecorder.prepare(); 
      // 开始录音 
      myRecorder.start(); 
    } catch (Exception e) { 
      e.printStackTrace(); 
    } 
  } 
 
 
  @Override 
  protected void onDestroy() { 
    super.onDestroy(); 
    // 如果myPlayer正在播放，那么就停止播放，并且释放资源 
    if (myPlayer.isPlaying()) { 
      myPlayer.stop(); 
      myPlayer.release(); 
    } 
    //如果myRecorder有内容（代表正在录音），那么就直接释放资源 
    if(myRecorder!=null) { 
      myRecorder.release(); 
      myPlayer.release(); 
    } 
  } 
 
}  

<LinearLayout 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" 
  android:orientation="vertical" 
  tools:context=".MainActivity"> 
 
 
  <TextView 
    android:layout_width="match_parent" 
    android:layout_height="wrap_content" 
    android:background="#000" 
    android:padding="13dp" 
    android:text="语音笔" 
    android:textColor="#fff" 
    android:textSize="22sp" 
    android:textStyle="bold" /> 
 
  <ListView 
    android:id="@+id/list" 
    android:layout_width="match_parent" 
    android:layout_height="0dp" 
    android:layout_weight="1" 
    android:padding="10dp" 
    ></ListView> 
 
  <LinearLayout 
    android:id="@+id/li1" 
    android:padding="10dp" 
    android:layout_width="match_parent" 
    android:layout_height="wrap_content" 
    android:orientation="horizontal"> 
 
    <Button 
      android:id="@+id/start" 
      android:layout_width="0dp" 
      android:layout_height="wrap_content" 
      android:layout_weight="1" 
      android:textSize="20sp" 
      android:text="开始录音" /> 
 
    <Button 
      android:id="@+id/stop" 
      android:layout_width="0dp" 
      android:layout_height="wrap_content" 
      android:layout_weight="1" 
      android:enabled="false" 
      android:textSize="20sp" 
      android:text="停止录音" /> 
  </LinearLayout> 
 
 
</LinearLayout> 

<?xml version="1.0" encoding="utf-8"?> 
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" 
  android:layout_width="match_parent" 
  android:layout_height="match_parent" 
  android:padding="10dp" 
  android:id="@+id/list_parent" 
  android:orientation="horizontal"> 
 
  <TextView 
    android:id="@+id/show_file_name" 
    android:layout_width="0dp" 
    android:layout_weight="1" 
    android:layout_height="wrap_content" 
    android:text="文件名" 
    android:textColor="#000" 
    android:textSize="20sp" 
    /> 
 
  <Button 
    android:id="@+id/bt_list_play" 
    android:layout_width="wrap_content" 
    android:layout_height="wrap_content" 
    android:textSize="18sp" 
    android:text="播放" /> 
 
  <Button 
    android:id="@+id/bt_list_stop" 
    android:layout_width="wrap_content" 
    android:layout_height="wrap_content" 
    android:textSize="18sp" 
    android:text="停止" /> 
 
</LinearLayout>