Android—多媒体(音频播放)

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思维导图

音频效果图:

音频布局文件：

<?xml version="1.0" encoding="utf-8"?><LinearLayout    xmlns:android="http://schemas.android.com/apk/res/android"    xmlns:app="http://schemas.android.com/apk/res-auto"    xmlns:tools="http://schemas.android.com/tools"    android:layout_width="match_parent"    android:layout_height="match_parent"    android:orientation="vertical"    tools:context="com.example.android27_palymusic.MainActivity">    <SeekBar        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:id="@+id/seekbar"        />    <ImageButton        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:src="@android:drawable/ic_media_play"        android:onClick="PlayOrPause"        /></LinearLayout>

一、应用程序内音频播放

package com.example.android27_palymusic;import android.media.MediaPlayer;import android.support.v7.app.AppCompatActivity;import android.os.Bundle;import android.view.View;import android.widget.ImageButton;import android.widget.SeekBar;public class MainActivity extends AppCompatActivity {    private SeekBar seekbar;    private MediaPlayer mediaPlayer;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        seekbar = (SeekBar) findViewById(R.id.seekbar);        //给进度条设置滑动监听事件        seekbar.setOnSeekBarChangeListener(new SeekBar.OnSeekBarChangeListener() {            @Override            public void onProgressChanged(SeekBar seekBar, int i, boolean b) {            }            @Override            public void onStartTrackingTouch(SeekBar seekBar) {            }            @Override            public void onStopTrackingTouch(SeekBar seekBar) {                //获取当前进度条的位置                int currentPosition=seekBar.getProgress();                //跳转到某个位置进行播放                mediaPlayer.seekTo(currentPosition);            }        });    }        public void PlayOrPause(View view){        ImageButton imageButton= (ImageButton) view;        if(mediaPlayer==null){ //判断是否是第一次进来            //应用内音频源            mediaPlayer = MediaPlayer.create(this, R.raw.a1);            //获取音乐的最大时长          int time=mediaPlayer.getDuration();            //设置进度条的最大值为音乐播放时长            seekbar.setMax(time);            //调取开始播放            mediaPlayer.start();            //换上暂停图标            imageButton.setImageResource(android.R.drawable.ic_media_pause);            //调取线程            new MyThead().start();        }else if(mediaPlayer.isPlaying()){ //判断是否正在播放            //调取暂停播放            mediaPlayer.pause();            //换上开始播放图标            imageButton.setImageResource(android.R.drawable.ic_media_play);        }else {            mediaPlayer.start();            imageButton.setImageResource(android.R.drawable.ic_media_pause);        }    }class MyThead extends Thread{    @Override    public void run() {        super.run();        while (seekbar.getProgress()<seekbar.getMax()){            //获取音乐当前播放位置            int currentPosition=mediaPlayer.getCurrentPosition();            seekbar.setProgress(currentPosition);        }    }}}

二、SD卡音频播放

package com.example.android27_palymusic;import android.media.AudioManager;import android.media.MediaPlayer;import android.net.Uri;import android.os.Environment;import android.support.v7.app.AppCompatActivity;import android.os.Bundle;import android.view.View;import android.widget.ImageButton;import android.widget.SeekBar;import java.io.IOException;public class MainActivity extends AppCompatActivity {    private SeekBar seekbar;    private MediaPlayer mediaPlayer;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        seekbar = (SeekBar) findViewById(R.id.seekbar);        //给进度条设置滑动监听事件        seekbar.setOnSeekBarChangeListener(new SeekBar.OnSeekBarChangeListener() {            @Override            public void onProgressChanged(SeekBar seekBar, int i, boolean b) {            }            @Override            public void onStartTrackingTouch(SeekBar seekBar) {            }            @Override            public void onStopTrackingTouch(SeekBar seekBar) {                //获取当前进度条的位置                int currentPosition=seekBar.getProgress();                //跳转到某个位置进行播放                mediaPlayer.seekTo(currentPosition);            }        });    }    public void PlayOrPause(View view) throws IOException {        ImageButton imageButton= (ImageButton) view;        if(mediaPlayer==null){ //判断是否是第一次进来            if(Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED)){ //判断内存卡是否可用                String sdPath=Environment.getExternalStorageDirectory().getAbsolutePath();  //获取路径                mediaPlayer=new MediaPlayer();                //设置音频流的类型              mediaPlayer.setAudioStreamType(AudioManager.STREAM_MUSIC);                //设置SD卡音频源                mediaPlayer.setDataSource(this, Uri.parse("file://"+sdPath+"/1473071258817.mp3"));                //设置异步准备                mediaPlayer.prepare();                //获取音乐的最大时长                int time=mediaPlayer.getDuration();                //设置进度条的最大值为音乐播放时长                seekbar.setMax(time);                //调取开始播放                mediaPlayer.start();                //换上暂停图标                imageButton.setImageResource(android.R.drawable.ic_media_pause);                //调取线程                new MyThead().start();            }        }else if(mediaPlayer.isPlaying()){ //判断是否正在播放            //调取暂停播放            mediaPlayer.pause();            //换上开始播放图标            imageButton.setImageResource(android.R.drawable.ic_media_play);        }else {            mediaPlayer.start();            imageButton.setImageResource(android.R.drawable.ic_media_pause);        }    }class MyThead extends Thread{    @Override    public void run() {        super.run();        while (seekbar.getProgress()<seekbar.getMax()){            //获取音乐当前播放位置            int currentPosition=mediaPlayer.getCurrentPosition();            seekbar.setProgress(currentPosition);        }    }}}

三、网络音频播放

package com.example.android27_palymusic;import android.media.AudioManager;import android.media.MediaPlayer;import android.net.Uri;import android.os.Environment;import android.support.v7.app.AppCompatActivity;import android.os.Bundle;import android.view.View;import android.widget.ImageButton;import android.widget.SeekBar;import java.io.IOException;public class MainActivity extends AppCompatActivity {    private SeekBar seekbar;    private MediaPlayer mediaPlayer;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        seekbar = (SeekBar) findViewById(R.id.seekbar);        //给进度条设置滑动监听事件        seekbar.setOnSeekBarChangeListener(new SeekBar.OnSeekBarChangeListener() {            @Override            public void onProgressChanged(SeekBar seekBar, int i, boolean b) {            }            @Override            public void onStartTrackingTouch(SeekBar seekBar) {            }            @Override            public void onStopTrackingTouch(SeekBar seekBar) {                //获取当前进度条的位置                int currentPosition=seekBar.getProgress();                //跳转到某个位置进行播放                mediaPlayer.seekTo(currentPosition);            }        });    }    public void PlayOrPause(View view) throws IOException {       final ImageButton imageButton= (ImageButton) view;        if(mediaPlayer==null){ //判断是否是第一次进来            if(Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED)){                String sdPath=Environment.getExternalStorageDirectory().getAbsolutePath();                mediaPlayer=new MediaPlayer();                //设置音频流的类型              mediaPlayer.setAudioStreamType(AudioManager.STREAM_MUSIC);               //设置网络音源                mediaPlayer.setDataSource(this, Uri.parse("http://192.168.43.210:8080/s8.mp3"));                mediaPlayer.prepareAsync();                //设置准备监听                mediaPlayer.setOnPreparedListener(new MediaPlayer.OnPreparedListener() {                    @Override                    public void onPrepared(MediaPlayer mediaPlayer) {                        //获取音乐的最大时长                        int time=mediaPlayer.getDuration();                        //设置进度条的最大值为音乐播放时长                        seekbar.setMax(time);                        //调取开始播放                        mediaPlayer.start();                        //换上暂停图标                        imageButton.setImageResource(android.R.drawable.ic_media_pause);                        //调取线程                        new MyThead().start();                    }                });            }        }else if(mediaPlayer.isPlaying()){ //判断是否正在播放            //调取暂停播放            mediaPlayer.pause();            //换上开始播放图标            imageButton.setImageResource(android.R.drawable.ic_media_play);        }else {            mediaPlayer.start();            imageButton.setImageResource(android.R.drawable.ic_media_pause);        }    }class MyThead extends Thread{    @Override    public void run() {        super.run();        while (seekbar.getProgress()<seekbar.getMax()){            //获取音乐当前播放位置            int currentPosition=mediaPlayer.getCurrentPosition();            seekbar.setProgress(currentPosition);        }    }}}

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