Android 多媒体播放API简单实例

<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" >

 <edittext
  android:id="@+id/et_path"
  android:layout_width="fill_parent"
  android:layout_height="wrap_content"
  android:hint="请输入音乐文件的路径" />

 <linearlayout
  android:layout_width="fill_parent"
  android:layout_height="wrap_content"
  android:orientation="horizontal" >

  <button
   android:id="@+id/bt_play"
   android:layout_width="0dip"
   android:layout_height="wrap_content"
   android:layout_weight="1"
   android:text="播放" />

  <button
   android:id="@+id/bt_pause"
   android:layout_width="0dip"
   android:layout_height="wrap_content"
   android:layout_weight="1"
   android:text="暂停" />

  <button
   android:id="@+id/bt_replay"
   android:layout_width="0dip"
   android:layout_height="wrap_content"
   android:layout_weight="1"
   android:text="重播" />

  <button
   android:id="@+id/bt_stop"
   android:layout_width="0dip"
   android:layout_height="wrap_content"
   android:layout_weight="1"
   android:text="停止" />
 </linearlayout>

</linearlayout>

package com.wuyudong.mp3player;

import java.io.file;
import java.io.ioexception;

import android.media.audiomanager;
import android.media.mediaplayer;
import android.media.mediaplayer.oncompletionlistener;
import android.net.uri;
import android.os.bundle;
import android.app.activity;
import android.view.menu;
import android.view.view;
import android.view.view.onclicklistener;
import android.widget.button;
import android.widget.edittext;
import android.widget.toast;

public class mainactivity extends activity implements onclicklistener {

 private edittext et_path;
 private button bt_play, bt_replay, bt_pause, bt_stop;

 private mediaplayer mediaplayer;

 @override
 protected void oncreate(bundle savedinstancestate) {
  super.oncreate(savedinstancestate);
  setcontentview(r.layout.activity_main);

  et_path = (edittext) findviewbyid(r.id.et_path);
  bt_play = (button) findviewbyid(r.id.bt_play);
  bt_replay = (button) findviewbyid(r.id.bt_replay);
  bt_pause = (button) findviewbyid(r.id.bt_pause);
  bt_stop = (button) findviewbyid(r.id.bt_stop);

  bt_pause.setonclicklistener(this);
  bt_play.setonclicklistener(this);
  bt_replay.setonclicklistener(this);
  bt_stop.setonclicklistener(this);

 }

 @override
 public void onclick(view v) {
  switch (v.getid()) {
  case r.id.bt_play:
   play();
   break;
  case r.id.bt_replay:
   replay();
   break;
  case r.id.bt_stop:
   stop();
   break;
  case r.id.bt_pause:
   pause();
   break;
  default:
   break;
  }
 }

 /**
  * 暂停音乐
  */
 private void pause() {
  if ("继续".equals(bt_pause.gettext().tostring().trim())) {
   mediaplayer.start();
   bt_pause.settext("暂停");
   return;
  }
  if (mediaplayer != null && mediaplayer.isplaying()) {
   mediaplayer.pause();
   bt_pause.settext("继续");
   return;
  }
 }

 /**
  * 重新播放
  */
 private void replay() {
  if (mediaplayer != null && mediaplayer.isplaying()) {
   mediaplayer.seekto(0);
   return;
  }
  play();
 }

 /**
  * 停止播放音乐
  */
 private void stop() {
  if (mediaplayer != null && mediaplayer.isplaying()) {
   mediaplayer.stop();
   mediaplayer.release(); // 记得释放资源
   mediaplayer = null;
   bt_play.setenabled(true);
  }
 }

 /**
  * 播放音乐
  */
 private void play() {
  string path = et_path.gettext().tostring().trim();
  file file = new file(path);
  if (file.exists() && file.length() > 0) {
   try {
    mediaplayer = new mediaplayer();
    mediaplayer.setaudiostreamtype(audiomanager.stream_music);
    mediaplayer.setdatasource(path);
    mediaplayer.prepare(); // might take long! (for buffering, etc)
    mediaplayer.start();
    mediaplayer.setoncompletionlistener(new oncompletionlistener() {
     @override
     public void oncompletion(mediaplayer mp) {
      bt_play.setenabled(true);
     }
    } );
    
    bt_play.setenabled(false);
   } catch (exception e) {
    toast.maketext(this, "播放失败", 0).show();
    e.printstacktrace();
   }
  } else {
   toast.maketext(this, "文件不存在", 0).show();
  }

 }

}