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Android实现网络音乐播放器

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本文是一个简单的音乐播放器
布局代码


xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
tools:context="com.zj.music.MainActivity">

android:id="@+id/song_progress_normal"
style="@style/Widget.AppCompat.ProgressBar.Horizontal"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_gravity="top"
android:maxHeight="5dp"
android:progress="30"
android:tag="tint_accent_color" />

android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_below="@id/song_progress_normal"
android:orientation="horizontal"
android:gravity="center_horizontal"
>
android:id="@+id/previous"
android:clickable="true"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:src="@drawable/btn_playback_previous"/>
android:layout_marginLeft="20dp"
android:id="@+id/start"
android:clickable="true"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:src="@drawable/start"/>
android:id="@+id/pause"
android:clickable="true"
android:layout_marginLeft="20dp"
android:layout_marginRight="20dp"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
/>
android:layout_marginRight="20dp"
android:id="@+id/stop"
android:clickable="true"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:src="@drawable/stop"/>
android:id="@+id/next"
android:clickable="true"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:src="@drawable/btn_playback_next"/>



java代码实现

package com.zj.music;

import android.media.AudioManager;
import android.media.MediaPlayer;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.widget.ImageView;
import android.widget.Toast;

public class MainActivity extends AppCompatActivity {

ImageView pause;
ImageView start;
ImageView stop;
ImageView previous;
ImageView next;
boolean isPlaying=false;
String filepath="http://10.129.69.114:8080/music";
MediaPlayer mediaPlayer;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);

pause= (ImageView) findViewById(R.id.pause);
start= (ImageView) findViewById(R.id.start);
stop= (ImageView) findViewById(R.id.stop);
pause.setBackgroundResource(R.drawable.btn_playback_pause);

start.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
startMusic();
}
});

stop.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
stopMusic();
}
});

pause.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
isPlaying=!isPlaying;
System.out.println("1243544444444");
if (isPlaying)
{
pause.setBackgroundResource(R.drawable.btn_playback_pause);
rePlayMusic();
}else
{
pause.setBackgroundResource(R.drawable.btn_playback_play);
pauseMusic();
}
}
});
}

private void startMusic() {
String nowMusic=filepath+"1.mp3";
try {

mediaPlayer = new MediaPlayer();

mediaPlayer.setDataSource(nowMusic);//设置播放的数据源。
mediaPlayer.setAudioStreamType(AudioManager.STREAM_MUSIC);
//mediaPlayer.prepare();//同步的准备方法。
mediaPlayer.prepareAsync();//异步的准备
mediaPlayer.setOnPreparedListener(new MediaPlayer.OnPreparedListener() {
@Override
public void onPrepared(MediaPlayer mp) {
mediaPlayer.start();
start.setEnabled(false);
}
});
mediaPlayer.setOnCompletionListener(new MediaPlayer.OnCompletionListener() {
@Override
public void onCompletion(MediaPlayer mp) {
start.setEnabled(true);
}
});

} catch (Exception e) {
e.printStackTrace();
Toast.makeText(this, "播放失败", Toast.LENGTH_SHORT).show();
}
}

private void pauseMusic() {

if(mediaPlayer!=null)
mediaPlayer.pause();

}

private void rePlayMusic()
{
if(mediaPlayer!=null)
mediaPlayer.start();
}
public void stopMusic() {
if(mediaPlayer!=null&&mediaPlayer.isPlaying()){
mediaPlayer.stop();
mediaPlayer.release();
mediaPlayer = null;
}

start.setEnabled(true);
}
}

注意,音乐文件应该放在webapp/root文件下,而不能直接放在根目录下,否则读不到。
效果如下


更新
    添加了下一首,进度条功能。解决了使用Fragment作为Item的ViewPager不更新问题.

使用Fragment作为Item的ViewPager不更新问题.

在点击下一首时,发现viewPager里面的内容不更新,查找了不少方法,找到解决方案,应该使用FragmentStatePagerAdapter。


我首先使用的是fragmentPagerAdapter.该类内的每一个生成的 Fragment 都将保存在内存之中. 也就是FragmentManager中.所以就算我刷新adapter, 它还是使用的上次缓存的Fragment. 而FragmentStatePagerAdapter的instantiateItem()则会每次都重新创建Fragment. 这样一来就每次就更新了.


参考链接

使用Fragment作为Item的ViewPager不更新问题. - Crazy Bird - 博客频道 - CSDN.NET


Android? FragmentStatePagerAdapter分页 - dreamzml的专栏 - 博客频道 - CSDN.NET


新代码实现

package com.zj.music;

import android.graphics.Color;
import android.media.AudioManager;
import android.media.MediaPlayer;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.support.design.widget.CollapsingToolbarLayout;
import android.support.design.widget.TabLayout;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentStatePagerAdapter;
import android.support.v4.view.ViewPager;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.Toolbar;
import android.util.Log;
import android.view.View;
import android.widget.ImageView;
import android.widget.SeekBar;
import android.widget.Toast;

import java.util.ArrayList;
import java.util.List;
import java.util.Timer;
import java.util.TimerTask;

public class MainActivity extends AppCompatActivity {

ImageView pause;
ImageView start;
ImageView stop;
ImageView previous;
ImageView next;
boolean isPlaying=false;
String filepath="http://192.168.1.130:8080/music";
String nowMusic;
int id=1;
MediaPlayer mediaPlayer;
SeekBar song_progress_normal;
private Timer timer;
private TimerTask task;
ViewPager mViewPager;
MyPagerAdapter adapter;
TabLayout tabLayout;

String autors[]=new String[]{"贝多芬","巴赫","舒伯特"};
String songs[]=new String []{"命运交响曲","G弦上的咏叹调","圣母颂"};

private static final int UPDATE = 0;
Handler handler=new Handler()
{
@Override
public void handleMessage(Message msg) {
switch (msg.what)
{
case UPDATE:
song_progress_normal.setProgress(mediaPlayer.getCurrentPosition());
Log.i("mediaplayer",mediaPlayer.getCurrentPosition()+"");
}
}
};

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);

initTOP();

pause= (ImageView) findViewById(R.id.pause);
start= (ImageView) findViewById(R.id.start);
stop= (ImageView) findViewById(R.id.stop);
previous= (ImageView) findViewById(R.id.previous);
next= (ImageView) findViewById(R.id.next);
song_progress_normal= (SeekBar) findViewById(R.id.song_progress_normal);




song_progress_normal.setOnSeekBarChangeListener(new SeekBar.OnSeekBarChangeListener() {
@Override
public void onProgressChanged(SeekBar seekBar, int i, boolean b) {
int postion = seekBar.getProgress();
mediaPlayer.seekTo(postion);
}

@Override
public void onStartTrackingTouch(SeekBar seekBar) {

}

@Override
public void onStopTrackingTouch(SeekBar seekBar) {

}
});


previous.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
if (id>1)
{
id--;
setupViewPager(mViewPager);
tabLayout.setupWithViewPager(mViewPager);
//adapter.notifyDataSetChanged();
stopMusic();
startMusic();
}
}
});

next.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
id++;

//setupViewPager(mViewPager);
//adapter.notifyDataSetChanged();
setupViewPager(mViewPager);

tabLayout.setupWithViewPager(mViewPager);

stopMusic();
startMusic();
}
});


pause.setBackgroundResource(R.drawable.btn_playback_pause);

start.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
startMusic();
}
});

stop.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
stopMusic();
}
});

pause.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
isPlaying=!isPlaying;
System.out.println("1243544444444");
if (isPlaying)
{
pause.setBackgroundResource(R.drawable.btn_playback_pause);
rePlayMusic();
}else
{
pause.setBackgroundResource(R.drawable.btn_playback_play);
pauseMusic();
}
}
});
}

private void initTOP() {

Toolbar mToolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(mToolbar);
getSupportActionBar().setDisplayHomeAsUpEnabled(true);

setTitle("音乐鉴赏");
//使用CollapsingToolbarLayout必须把title设置到CollapsingToolbarLayout上,设置到Toolbar上则不会显示
CollapsingToolbarLayout mCollapsingToolbarLayout = (CollapsingToolbarLayout) findViewById(R.id.collapsing_toolbar);
mCollapsingToolbarLayout.setTitle("音乐鉴赏");
//通过CollapsingToolbarLayout修改字体颜色
mCollapsingToolbarLayout.setExpandedTitleColor(Color.WHITE);//设置还没收缩时状态下字体颜色
mCollapsingToolbarLayout.setCollapsedTitleTextColor(Color.BLACK);//设置收缩后Toolbar上字体的颜色


//设置ViewPager
mViewPager = (ViewPager) findViewById(R.id.viewpager);
setupViewPager(mViewPager);

//给TabLayout增加Tab, 并关联ViewPager
tabLayout = (TabLayout) findViewById(R.id.sliding_tabs);
tabLayout.addTab(tabLayout.newTab().setText("请您欣赏"));
tabLayout.addTab(tabLayout.newTab().setText("作者简介"));
tabLayout.addTab(tabLayout.newTab().setText("歌曲简介"));

tabLayout.setupWithViewPager(mViewPager);
}

private void setupViewPager(ViewPager mViewPager) {
adapter = new MyPagerAdapter(getSupportFragmentManager());
adapter.addFragment(DetailFragment.newInstance("请欣赏古典音乐,欲知作者与曲名可右滑"), "请您欣赏");
adapter.addFragment(DetailFragment.newInstance(autors[id-1]), "作者简介");
adapter.addFragment(DetailFragment.newInstance(songs[id-1]), "歌曲简介");

mViewPager.setAdapter(adapter);
}

List mFragments;
static class MyPagerAdapter extends FragmentStatePagerAdapter {
private List mFragments=null;
private List mFragmentTitles =null;

public MyPagerAdapter(FragmentManager fm) {
super(fm);
mFragments=new ArrayList<>();
mFragmentTitles = new ArrayList<>();
}

public void addFragment(Fragment fragment, String title) {
mFragments.add(fragment);
mFragmentTitles.add(title);
}

public void removeAllFra()
{
mFragments.clear();
mFragmentTitles.clear();
}

@Override
public Fragment getItem(int position) {
return mFragments.get(position);
}

@Override
public int getCount() {
return mFragments.size();
}

@Override
public CharSequence getPageTitle(int position) {
return mFragmentTitles.get(position);
}
}



private void startMusic() {
nowMusic=filepath+id+".mp3";
try {

mediaPlayer = new MediaPlayer();

mediaPlayer.setDataSource(nowMusic);//设置播放的数据源。
mediaPlayer.setAudioStreamType(AudioManager.STREAM_MUSIC);
//mediaPlayer.prepare();//同步的准备方法。
mediaPlayer.prepareAsync();//异步的准备
mediaPlayer.setOnPreparedListener(new MediaPlayer.OnPreparedListener() {
@Override
public void onPrepared(MediaPlayer mp) {
mediaPlayer.start();
start.setEnabled(false);

int max = mediaPlayer.getDuration();
Log.i("mediaplayer", max + "最大");
song_progress_normal.setMax(max);

}
});
mediaPlayer.setOnCompletionListener(new MediaPlayer.OnCompletionListener() {
@Override
public void onCompletion(MediaPlayer mp) {
start.setEnabled(true);
}
});

new Thread(new Runnable() {
@Override
public void run() {

timer = new Timer();
task = new TimerTask() {
@Override
public void run() {
handler.sendEmptyMessage(UPDATE);
}
};
timer.schedule(task, 0, 5000);

}
}).start();




} catch (Exception e) {
e.printStackTrace();
Toast.makeText(this, "播放失败", Toast.LENGTH_SHORT).show();
}
}

private void pauseMusic() {

if(mediaPlayer!=null)
mediaPlayer.pause();

}

private void rePlayMusic()
{
if(mediaPlayer!=null)
mediaPlayer.start();
}
public void stopMusic() {
if(mediaPlayer!=null&&mediaPlayer.isPlaying()){
mediaPlayer.stop();
mediaPlayer.release();
mediaPlayer = null;
timer.cancel();
}

start.setEnabled(true);
}
}

效果如下


完成


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