android学习之-MediaRecorder

1.项目清单权限

<uses-permission android:name="android.permission.RECORD_AUDIO"/>
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />

2.activity

package com.enterise.always.activity;import java.io.File;import java.io.IOException;import android.app.Activity;import android.content.Intent;import android.media.MediaRecorder;import android.os.Bundle;import android.os.Environment;import android.view.View;import android.view.View.OnClickListener;import android.widget.Button;import android.widget.Toast;public class MainActivity extends Activity implements OnClickListener{    /** Called when the activity is first created. */  private Button but_start,but_stop,but_file; private boolean issdcard = false; File mp3file; File filename; MediaRecorder recorder;    @Override    public void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.main);        but_start = (Button)this.findViewById(R.id.main_start);        but_stop = (Button)this.findViewById(R.id.main_stop);        but_file = (Button) this.findViewById(R.id.main_file);                but_start.setOnClickListener(this);        but_stop.setOnClickListener(this);        but_file.setOnClickListener(this);                issdcard = (Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED));                if(issdcard) {         File file = Environment.getExternalStorageDirectory();         filename = new File(file, "demo");   if(!filename.exists()){    filename.mkdirs();   }      String medianame = System.currentTimeMillis()+".arm";   mp3file = new File(filename, medianame);        }else {         Toast.makeText(this, "sd卡不能用！", Toast.LENGTH_LONG).show();        }                            }     private void initMediaRecorder() {    recorder = new MediaRecorder();    // 设置录音来源为麦克风          recorder.setAudioSource(MediaRecorder.AudioSource.MIC);          recorder.setOutputFormat(MediaRecorder.OutputFormat.DEFAULT);          recorder.setAudioEncoder(MediaRecorder.AudioEncoder.DEFAULT);          //文件保存位置          recorder.setOutputFile(mp3file.getAbsolutePath()); }   @Override public void onClick(View v) {    switch(v.getId()) {  //录音  case R.id.main_start:   try {    initMediaRecorder();    recorder.prepare();    recorder.start();    but_start.setText("录音中");   } catch (IllegalStateException e) {    e.printStackTrace();   } catch (IOException e) {    e.printStackTrace();   }   break;  case R.id.main_stop:   if(mp3file != null) {    recorder.stop();    recorder.reset();    recorder = null;   }   break;     case R.id.main_file:   String path = filename.getAbsolutePath();   Intent intent = new Intent(MainActivity.this,ListViewActivity.class);   intent.putExtra("filename", path);   startActivity(intent);   break;  }   }}

main.xim

<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:orientation="vertical" android:layout_width="fill_parent" android:layout_height="fill_parent"> <RelativeLayout android:layout_height="wrap_content"  android:layout_width="fill_parent">  <LinearLayout android:layout_height="wrap_content"   android:layout_width="fill_parent" android:orientation="horizontal"   android:layout_alignParentBottom="true">   <Button android:layout_width="wrap_content"    android:layout_height="wrap_content" android:id="@+id/main_start"    android:layout_weight="1" android:text="录音" />   <Button android:layout_width="wrap_content"    android:layout_height="wrap_content" android:id="@+id/main_stop"    android:layout_weight="1" android:text="停止" />   <Button android:layout_width="wrap_content"    android:layout_height="wrap_content" android:id="@+id/main_file"    android:layout_weight="1" android:text="录音文件" />  </LinearLayout> </RelativeLayout></LinearLayout>

ListViewActivity

package com.enterise.always.activity;import java.io.File;import java.util.ArrayList;import java.util.HashMap;import java.util.Iterator;import java.util.List;import java.util.Map.Entry;import java.util.Set;import android.app.Activity;import android.content.Intent;import android.os.Bundle;import android.view.View;import android.view.Window;import android.widget.AdapterView;import android.widget.AdapterView.OnItemClickListener;import android.widget.ListView;import android.widget.SimpleAdapter;public class ListViewActivity extends Activity implements OnItemClickListener{ private ListView listView; File file; String filename; String[] listname; @Override protected void onCreate(Bundle savedInstanceState) {    super.onCreate(savedInstanceState);  requestWindowFeature(Window.FEATURE_NO_TITLE);  setContentView(R.layout.listview);  Intent intent = getIntent();    filename = (String)intent.getExtras().get("filename");    listView = (ListView)this.findViewById(R.id.listview);  //初始化  init();   } private void init() {  file = new File(filename);  listname = file.list();     List<HashMap<String,Object>> data = initData();  SimpleAdapter adapter = new SimpleAdapter(this, data, R.layout.listview_wrap,         new String[]{"name"},         new int[]{R.id.wrap_textview});  listView.setAdapter(adapter);    listView.setOnItemClickListener(this); }  //数据加载 private List<HashMap<String,Object>> initData() {    List<HashMap<String,Object>> list = new ArrayList<HashMap<String,Object>>();  for(String name : listname) {   HashMap<String, Object> map = new HashMap<String, Object>();   map.put("name", name);   list.add(map);  }  return list; } //点击事件处理 @Override public void onItemClick(AdapterView<?> parent, View view, int position,   long id) {    @SuppressWarnings("unchecked")  HashMap<String,Object> map = (HashMap<String, Object>) parent.getItemAtPosition(position);  Set<Entry<String,Object>> entrySet = map.entrySet();  Iterator<Entry<String, Object>> iterator = entrySet.iterator();    String value = null;    while(iterator.hasNext()) {   Entry<String, Object> next = iterator.next();   value = (String) next.getValue();  }  String path = filename+File.separator+value;  Intent intent = new Intent(this,MediaPlayerActivity.class);  intent.putExtra("path", path);  startActivity(intent); }  } 

xml文件：

listview.xml<?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"> <ListView android:layout_height="wrap_content"  android:layout_width="wrap_content" android:id="@+id/listview"  android:layout_marginLeft="20dp" android:layout_marginTop="20dp" /></LinearLayout>listwrap.xml<?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="wrap_content"> <TextView android:layout_height="wrap_content"  android:layout_width="wrap_content" android:layout_gravity="center"  android:gravity="center_horizontal" android:id="@+id/wrap_textview"  android:text="ddddddddddddddddddddd" /></LinearLayout>

package com.enterise.always.activity;import java.io.IOException;import android.app.Activity;import android.content.Intent;import android.media.MediaPlayer;import android.os.Bundle;public class MediaPlayerActivity extends Activity{ @Override protected void onCreate(Bundle savedInstanceState) {  super.onCreate(savedInstanceState);    setContentView(R.layout.mediaplayer);  Intent intent = getIntent();  String path = intent.getExtras().getString("path");    MediaPlayer player = new MediaPlayer();    try {   player.setDataSource(path);   player.prepare();   player.start();  } catch (IllegalStateException e) {   // TODO Auto-generated catch block   e.printStackTrace();  } catch (IOException e) {   // TODO Auto-generated catch block   e.printStackTrace();  }   }  }