android音频（一）

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1.通过意图使用内置的音频播放器

Intent intent=new Intent(android.content.Intent.ACTION_VIEW);File audioFile=new File(Environment.getExternalStorageDirectory()+"/Music/mylove.mp3");intent.setDataAndType(Uri.fromFile(audioFile), "audio/mp3");startActivity(intent);

2.创建自定义播放应用（在onStart中初始化MediaPlayer对象和开始播放，可以在活动不再活跃时，停止播放）

MediaPlayer mediaPlayer；

        @Overrideprotected void onStart() {// TODO Auto-generated method stubsuper.onStart();mediaPlayer = MediaPlayer.create(this, R.raw.life);mediaPlayer.setOnCompletionListener(this);mediaPlayer.start();}@Overrideprotected void onStop() {// TODO Auto-generated method stubsuper.onStop();mediaPlayer.stop();mediaPlayer.release();}

      @Overridepublic void onCompletion(MediaPlayer mp) {// TODO Auto-generated method stubmediaPlayer.start();}

完整代码如下：

package com.example.testaudioedit;import java.io.File;import android.app.Activity;import android.content.Intent;import android.media.MediaPlayer;import android.media.MediaPlayer.OnCompletionListener;import android.net.Uri;import android.os.Bundle;import android.os.Environment;import android.view.MotionEvent;import android.view.View;import android.view.View.OnClickListener;import android.view.View.OnTouchListener;import android.widget.Button;public class AudioPlayer extends Activity implements OnClickListener,OnCompletionListener, OnTouchListener {private MediaPlayer mediaPlayer;private Button startButton, stopButton;private int position = 0;// 保存播放位置private View musicProgress;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);initView();}private void initView() {// TODO Auto-generated method stubstartButton = (Button) findViewById(R.id.internal_play);stopButton = (Button) findViewById(R.id.internal_stop);musicProgress = findViewById(R.id.musicView);startButton.setOnClickListener(this);stopButton.setOnClickListener(this);musicProgress.setOnTouchListener(this);mediaPlayer = MediaPlayer.create(this, R.raw.life);//资源文件，在资源文件夹下创建raw文件夹，life表示的是要播放的音频文件mediaPlayer.setOnCompletionListener(this);mediaPlayer.start();}@Overrideprotected void onStart() {// TODO Auto-generated method stubsuper.onStart();}@Overrideprotected void onStop() {// TODO Auto-generated method stubsuper.onStop();mediaPlayer.stop();mediaPlayer.release();}@Overridepublic void onClick(View v) {// TODO Auto-generated method stubswitch (v.getId()) {case R.id.internal_play:if (!mediaPlayer.isPlaying())mediaPlayer.start();break;case R.id.internal_stop:if (mediaPlayer.isPlaying())mediaPlayer.pause();break;default:break;}}@Overridepublic void onCompletion(MediaPlayer mp) {// TODO Auto-generated method stubmediaPlayer.start();mediaPlayer.seekTo(position);}@Overridepublic boolean onTouch(View v, MotionEvent event) {// TODO Auto-generated method stubif (event.getAction() == MotionEvent.ACTION_MOVE) {if (mediaPlayer.isPlaying()) {position = (int) (event.getX() * mediaPlayer.getDuration() / musicProgress.getWidth());mediaPlayer.seekTo(position);}}return true;}}

activity_main.xml文件如下：

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"    xmlns:tools="http://schemas.android.com/tools"    android:id="@+id/container"    android:layout_width="match_parent"    android:layout_height="match_parent">        <Button         android:id="@+id/internal_play"        android:layout_width="150dp"        android:layout_height="60dp"        android:layout_marginLeft="10dp"        android:text="play"/>    <Button         android:id="@+id/internal_stop"        android:layout_toRightOf="@+id/internal_play"        android:layout_width="150dp"        android:layout_height="60dp"        android:text="stop"/>        <View        android:id="@+id/musicView"        android:layout_below="@+id/internal_play"        android:layout_width="fill_parent"        android:layout_height="fill_parent" />    </RelativeLayout>

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