本文是一個簡單的音樂播放器

布局代碼

<?xml version="1.0" encoding="utf-8"?> <RelativeLayout 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: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"><ProgressBar 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" /><LinearLayout android:layout_width="match_parent"android:layout_height="wrap_content"android:layout_below="@id/song_progress_normal"android:orientation="horizontal"android:gravity="center_horizontal"><ImageView android:id="@+id/previous"android:clickable="true"android:layout_width="wrap_content"android:layout_height="wrap_content"android:src="@drawable/btn_playback_previous"/><ImageView 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"/><ImageView 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"/><ImageView 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"/><ImageView android:id="@+id/next"android:clickable="true"android:layout_width="wrap_content"android:layout_height="wrap_content"android:src="@drawable/btn_playback_next"/></LinearLayout> </RelativeLayout>

java代碼實現

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;@Overrideprotected 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() {@Overridepublic void onClick(View view) {startMusic();}});stop.setOnClickListener(new View.OnClickListener() {@Overridepublic void onClick(View view) {stopMusic();}});pause.setOnClickListener(new View.OnClickListener() {@Overridepublic 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);//設置播放的數據源。mediaPlayer.setAudioStreamType(AudioManager.STREAM_MUSIC);//mediaPlayer.prepare();//同步的準備方法。mediaPlayer.prepareAsync();//異步的準備mediaPlayer.setOnPreparedListener(new MediaPlayer.OnPreparedListener() {@Overridepublic void onPrepared(MediaPlayer mp) {mediaPlayer.start();start.setEnabled(false);}});mediaPlayer.setOnCompletionListener(new MediaPlayer.OnCompletionListener() {@Overridepublic void onCompletion(MediaPlayer mp) {start.setEnabled(true);}});} catch (Exception e) {e.printStackTrace();Toast.makeText(this, "播放失敗", 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，音樂文件應該放在webapp/root文件下，而不能直接放在根目錄下，否則讀不到。

效果如下

更新

添加了下一首，進度條功能。

解決了使用Fragment作為Item的ViewPager不更新問題.

使用Fragment作為Item的ViewPager不更新問題.

在點擊下一首時，發現viewPager里面的內容不更新，查找了不少方法，找到解決方案，應該使用FragmentStatePagerAdapter。

我首先使用的是fragmentPagerAdapter.該類內的每一個生成的 Fragment 都將保存在內存之中. 也就是FragmentManager中.所以就算我刷新adapter, 它還是使用的上次緩存的Fragment. 而FragmentStatePagerAdapter的instantiateItem()則會每次都重新創建Fragment. 這樣一來就每次就更新了.

參考鏈接

使用Fragment作為Item的ViewPager不更新問題. - Crazy Bird - 博客頻道 - CSDN.NET

Android– FragmentStatePagerAdapter分頁 - dreamzml的專欄 - 博客頻道 - CSDN.NET

新代碼實現

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[]{"貝多芬","巴赫","舒伯特"};String songs[]=new String []{"命運交響曲","G弦上的詠嘆調","圣母頌"};private static final int UPDATE = 0;Handler handler=new Handler(){@Overridepublic void handleMessage(Message msg) {switch (msg.what){case UPDATE:song_progress_normal.setProgress(mediaPlayer.getCurrentPosition());Log.i("mediaplayer",mediaPlayer.getCurrentPosition()+"");}}};@Overrideprotected 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() {@Overridepublic void onProgressChanged(SeekBar seekBar, int i, boolean b) {int postion = seekBar.getProgress();mediaPlayer.seekTo(postion);}@Overridepublic void onStartTrackingTouch(SeekBar seekBar) {}@Overridepublic void onStopTrackingTouch(SeekBar seekBar) {}});previous.setOnClickListener(new View.OnClickListener() {@Overridepublic void onClick(View view) {if (id>1){id--;setupViewPager(mViewPager);tabLayout.setupWithViewPager(mViewPager);//adapter.notifyDataSetChanged();stopMusic();startMusic();}}});next.setOnClickListener(new View.OnClickListener() {@Overridepublic 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() {@Overridepublic void onClick(View view) {startMusic();}});stop.setOnClickListener(new View.OnClickListener() {@Overridepublic void onClick(View view) {stopMusic();}});pause.setOnClickListener(new View.OnClickListener() {@Overridepublic 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("音樂鑒賞");//使用CollapsingToolbarLayout必須把title設置到CollapsingToolbarLayout上，設置到Toolbar上則不會顯示CollapsingToolbarLayout mCollapsingToolbarLayout = (CollapsingToolbarLayout) findViewById(R.id.collapsing_toolbar);mCollapsingToolbarLayout.setTitle("音樂鑒賞");//通過CollapsingToolbarLayout修改字體顏色mCollapsingToolbarLayout.setExpandedTitleColor(Color.WHITE);//設置還沒收縮時狀態下字體顏色mCollapsingToolbarLayout.setCollapsedTitleTextColor(Color.BLACK);//設置收縮后Toolbar上字體的顏色//設置ViewPagermViewPager = (ViewPager) findViewById(R.id.viewpager);setupViewPager(mViewPager);//給TabLayout增加Tab, 并關聯ViewPagertabLayout = (TabLayout) findViewById(R.id.sliding_tabs);tabLayout.addTab(tabLayout.newTab().setText("請您欣賞"));tabLayout.addTab(tabLayout.newTab().setText("作者簡介"));tabLayout.addTab(tabLayout.newTab().setText("歌曲簡介"));tabLayout.setupWithViewPager(mViewPager);}private void setupViewPager(ViewPager mViewPager) {adapter = new MyPagerAdapter(getSupportFragmentManager());adapter.addFragment(DetailFragment.newInstance("請欣賞古典音樂，欲知作者與曲名可右滑"), "請您欣賞");adapter.addFragment(DetailFragment.newInstance(autors[id-1]), "作者簡介");adapter.addFragment(DetailFragment.newInstance(songs[id-1]), "歌曲簡介");mViewPager.setAdapter(adapter);}List<Fragment> mFragments;static class MyPagerAdapter extends FragmentStatePagerAdapter {private List<Fragment> mFragments=null;private List<String> 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();}@Overridepublic Fragment getItem(int position) {return mFragments.get(position);}@Overridepublic int getCount() {return mFragments.size();}@Overridepublic CharSequence getPageTitle(int position) {return mFragmentTitles.get(position);}}private void startMusic() {nowMusic=filepath+id+".mp3";try {mediaPlayer = new MediaPlayer();mediaPlayer.setDataSource(nowMusic);//設置播放的數據源。mediaPlayer.setAudioStreamType(AudioManager.STREAM_MUSIC);//mediaPlayer.prepare();//同步的準備方法。mediaPlayer.prepareAsync();//異步的準備mediaPlayer.setOnPreparedListener(new MediaPlayer.OnPreparedListener() {@Overridepublic 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() {@Overridepublic void onCompletion(MediaPlayer mp) {start.setEnabled(true);}});new Thread(new Runnable() {@Overridepublic void run() {timer = new Timer();task = new TimerTask() {@Overridepublic void run() {handler.sendEmptyMessage(UPDATE);}};timer.schedule(task, 0, 5000);}}).start();} catch (Exception e) {e.printStackTrace();Toast.makeText(this, "播放失敗", 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

總結

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