简单音乐播放器的实现
2020年5月14日 星期四 晴☀
今天在慕课学习了音频播放器的实现，做完了真的是高兴啊！现在把这个播放器分享给大家！
先看看结果：
操作方法：
- 安装后，首先要打开存储权限，不然直接打开会被告知“对不起，暂时没有音乐文件”；
- 存储权限打开后，在手机文件目录下，排序->按修改时间排序->找到一个名为“playmusic”的文件夹，这就是我们要存歌曲的文件夹，或者我们可以手动创建playmusic文件夹；
- 从手机下载几首音频文件，复制到步骤2所说的文件夹下，重新打开安装的应用，就可以使用了；
源码分享
layout/main.xml
"1.0" encoding="utf-8"?>
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
android:id="@+id/lvNames"
android:layout_width="match_parent"
android:layout_height="wrap_content" />
layout/play.xml
"1.0" encoding="utf-8"?>
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
android:id="@+id/tvMusic"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:gravity="center"
android:text="music.mp3"
android:textColor="#000000"
android:textSize="20dp" />
android:layout_width="match_parent"
android:layout_height="wrap_content">
android:layout_width="match_parent"
android:layout_height="wrap_content">
android:layout_width="match_parent"
android:layout_height="wrap_content">
android:layout_width="match_parent"
android:layout_height="wrap_content">
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical">
android:id="@+id/seekbar"
android:layout_width="match_parent"
android:layout_height="wrap_content" />
android:layout_width="match_parent"
android:layout_height="wrap_content">
android:id="@+id/tvProgressLeft"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="1"
android:paddingLeft="5dp" />
android:id="@+id/tvProgressRight"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="1"
android:gravity="right"
android:paddingRight="5dp" />
layout/item_message.xml
"1.0" encoding="utf-8"?>
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="wrap_content">
android:id="@+id/iv_head"
android:layout_width="60dp"
android:layout_height="60dp"
android:scaleType="fitXY"
android:src="@mipmap/ic_launcher" />
android:id="@+id/ll"
android:layout_width="300dp"
android:layout_height="wrap_content"
android:layout_centerVertical="true"
android:layout_toRightOf="@+id/iv_head"
android:orientation="vertical">
android:id="@+id/tvName"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="歌曲名" />
android:id="@+id/tvLocation"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="歌曲保存位置" />
android:id="@+id/tvTime"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerVertical="true"
android:layout_toRightOf="@+id/ll"
android:text="3:56" />
com.example.music_player.MainActivity
package com.example.music_player;
import android.content.Context;
import android.content.Intent;
import android.media.MediaPlayer;
import android.os.Bundle;
import android.os.Environment;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ListView;
import android.widget.SimpleAdapter;
import android.widget.Toast;
import androidx.appcompat.app.AppCompatActivity;
import java.io.File;
import java.io.FileFilter;
import java.io.IOException;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.concurrent.TimeUnit;
public class MainActivity extends AppCompatActivity {
protected Context context;
private String MEDIA_PATH = "";//SD卡路径
private ListView listView;
private ArrayList<HashMap<String, Object>> listItems = new ArrayList<HashMap<String, Object>>();//存放歌曲相关信息
private FileFilter fileFilter = new FileFilter() {
@Override
public boolean accept(File pathname) {
return !pathname.isDirectory() && pathname.getName().matches("^.*?\\.(mp3|mid|wma)$");
}
};
private SimpleAdapter simpleAdapter;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
listView = findViewById(R.id.lvNames);
//1. 判断SD卡的playmusic目录及音乐文件功能
if (Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED)) {
MEDIA_PATH = Environment.getExternalStorageDirectory().toString();
} else {
Toast.makeText(MainActivity.this, "对不起，SD卡不存在", Toast.LENGTH_SHORT).show();
return;
}
File folder = new File(MEDIA_PATH + "/playmusic/");
if (!folder.exists()) {
folder.mkdir();
Toast.makeText(MainActivity.this, "对不起，暂时没有音乐文件", Toast.LENGTH_SHORT).show();
finish();
return;
}
//2. 定义音乐文件扩展名（定义一个FileFilter）
File[] fileArr = folder.listFiles(fileFilter);
//3. 给ListView装配数据
//将满足扩展名的文件信息（图片，歌曲名，存放位置，播放时间等）存放在ArrayList中
HashMap<String, Object> map;
for (File file : fileArr) {
map = new HashMap<String, Object>();
map.put("icon", R.mipmap.ic_launcher);//图片
map.put("fileName", file.getName());//歌曲名
map.put("filePathName", file.getAbsolutePath());//歌曲存放路径
MediaPlayer mediaPlayer = new MediaPlayer();
try {
mediaPlayer.setDataSource(file.getAbsolutePath());
mediaPlayer.prepare();
int mTime = mediaPlayer.getDuration();
long minutes = TimeUnit.MILLISECONDS.toMinutes(mTime);
long seconds = TimeUnit.MILLISECONDS.toSeconds(mTime) - minutes * 60;
String sTime = String.format("%d:%d", minutes, seconds);
map.put("fileTime", sTime);//音乐播放时间
} catch (IOException e) {
e.printStackTrace();
}
listItems.add(map);
}
//4. 将数据与ListView绑定（对于每一行的布局文件）
String[] from = new String[]{"icon", "fileName", "filePathName", "fileTime"};
int[] to = new int[]{R.id.iv_head, R.id.tvName, R.id.tvLocation, R.id.tvTime};
simpleAdapter = new SimpleAdapter(MainActivity.this, listItems, R.layout.item_message, from, to);
listView.setAdapter(simpleAdapter);
//5. 单机歌曲名，会打开PlayActivity并将歌曲信息传入
listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
Intent intent = new Intent(MainActivity.this, PlayActivity.class);
intent.putExtra("index", position);
intent.putExtra("list", listItems);
startActivity(intent);
}
});
}
}
com.example.music_player.PlayActivity
package com.example.music_player;
import android.content.Intent;
import android.media.AudioManager;
import android.media.MediaPlayer;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.text.TextUtils;
import android.view.View;
import android.widget.Button;
import android.widget.SeekBar;
import android.widget.TextView;
import android.widget.Toast;
import androidx.annotation.NonNull;
import androidx.appcompat.app.AppCompatActivity;
import java.io.IOException;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.Random;
public class PlayActivity extends AppCompatActivity {
private TextView tvMusic, tvProgressLeft, tvProgressRight;
private Button btnLast, btnNext, btnPlay, btnStopTemp, btnStop, btnMode1, btnMode2, btnMode3, btnTurnDown, btnTurnUp;
private SeekBar seekbar;
private AudioManager audioManager;
private MediaPlayer mediaPlayer = new MediaPlayer();
private ArrayList<HashMap<String, Object>> musicList;
private int index;
private int playMode = 0;//播放模式：0-顺序播放，1-随机播放，2-单曲循环
private Random random = new Random();//随机播放歌曲的序号
Handler handler = new Handler() {
@Override
public void handleMessage(@NonNull Message msg) {
super.handleMessage(msg);
switch (msg.what) {
case 9999:
seekbar.setProgress(msg.arg2);
seekbar.setMax(msg.arg1);
int leftTime = msg.arg2 / 1000;
int leftMinute = leftTime / 60;
int leftSecond = leftTime % 60;
tvProgressLeft.setText(leftMinute + ":" + leftSecond);
int rightTime = (msg.arg1 - msg.arg2) / 1000;
int rightMinute = rightTime / 60;
int rightSecond = rightTime % 60;
tvProgressRight.setText(rightMinute + ":" + rightSecond);
break;
}
}
};
Runnable runnable = new Runnable() {
@Override
public void run() {
try {
while (true) {
Thread.sleep(200);
Message message = new Message();
message.what = 9999;
message.arg1 = mediaPlayer.getDuration();//歌曲的总进度
message.arg2 = mediaPlayer.getCurrentPosition();//歌曲当前进度
handler.sendMessage(message);
}
} catch (InterruptedException e) {
e.printStackTrace();
}
}
};
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.play);
initView();
audioManager = (AudioManager) getSystemService(AUDIO_SERVICE);
final Intent intent = this.getIntent();
index = intent.getIntExtra("index", 0);
musicList = (ArrayList<HashMap<String, Object>>) intent.getSerializableExtra("list");
//播放歌曲及显示相关信息
//1. 显示歌曲名
tvMusic.setText((CharSequence) musicList.get(index).get("fileName"));
//2. 播放歌曲
playMusic(index);
btnLast.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
index--;
if (index < 0) {
Toast.makeText(PlayActivity.this, "没有更多歌曲了", Toast.LENGTH_SHORT).show();
return;
}
playMusic(index);
}
});
btnNext.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
index++;
if (index >= musicList.size()) {
Toast.makeText(PlayActivity.this, "没有更多歌曲了", Toast.LENGTH_SHORT).show();
return;
}
playMusic(index);
}
});
btnStop.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
if (mediaPlayer.isPlaying()) {
mediaPlayer.stop();
}
}
});
btnStopTemp.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
if (mediaPlayer.isPlaying()) {
mediaPlayer.pause();
}
}
});
btnPlay.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
mediaPlayer.start();
}
});
btnTurnUp.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
audioManager.adjustStreamVolume(AudioManager.STREAM_MUSIC, AudioManager.ADJUST_RAISE, AudioManager.FLAG_SHOW_UI);
}
});
btnTurnDown.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
audioManager.adjustStreamVolume(AudioManager.STREAM_MUSIC, AudioManager.ADJUST_LOWER, AudioManager.FLAG_SHOW_UI);
}
});
btnMode1.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
playMode = 0;//顺序播放
}
});
btnMode2.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
playMode = 1;//随机播放
}
});
btnMode3.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
playMode = 2;//单曲循环
}
});
seekbar.setOnSeekBarChangeListener(new SeekBar.OnSeekBarChangeListener() {
@Override
public void onProgressChanged(SeekBar seekBar, int progress, boolean fromUser) {//当进度改变时的操作
}
@Override
public void onStartTrackingTouch(SeekBar seekBar) {//当拖动滑块开始执行的操作
}
@Override
public void onStopTrackingTouch(SeekBar seekBar) {//当停止拖动滑块开始进行的操作
mediaPlayer.seekTo(seekBar.getProgress());
}
});
}
void playMusic(int index) {
tvMusic.setText(musicList.get(index).get("fileName").toString());//显示歌曲名
String path = musicList.get(index).get("filePathName").toString();//取出歌曲保存位置
if (TextUtils.isEmpty(path)) {
return;
}
if (mediaPlayer.isPlaying()) {
mediaPlayer.stop();
}
mediaPlayer.release();
mediaPlayer = null;
mediaPlayer = new MediaPlayer();
mediaPlayer.reset();
try {
mediaPlayer.setDataSource(path);
mediaPlayer.prepare();
//mediaPlayer.start();
mediaPlayer.setOnPreparedListener(new SetPreparedListener());//设置当歌曲准备完毕后的监听事件
mediaPlayer.setOnCompletionListener(new SetCompletionListener());//设置一首歌播放完的监听事件
} catch (IOException e) {
e.printStackTrace();
}
}
void initView() {
tvMusic = findViewById(R.id.tvMusic);
tvProgressLeft = findViewById(R.id.tvProgressLeft);
tvProgressRight = findViewById(R.id.tvProgressRight);
btnLast = findViewById(R.id.btnLast);
btnNext = findViewById(R.id.btnNext);
btnPlay = findViewById(R.id.btnPlay);
btnStopTemp = findViewById(R.id.btnStopTemp);
btnStop = findViewById(R.id.btnStop);
btnMode1 = findViewById(R.id.btnMode1);
btnMode2 = findViewById(R.id.btnMode2);
btnMode3 = findViewById(R.id.btnMode3);
btnTurnDown = findViewById(R.id.btnTurnDown);
btnTurnUp = findViewById(R.id.btnTurnUp);
seekbar = findViewById(R.id.seekbar);
}
class SetPreparedListener implements MediaPlayer.OnPreparedListener {
@Override
public void onPrepared(MediaPlayer mp) {
//1. 开始播放
mediaPlayer.start();
//2. 更新seekbar的进度，需要使用handler，runnable配合
new Thread(runnable).start();
}
}
class SetCompletionListener implements MediaPlayer.OnCompletionListener {
@Override
public void onCompletion(MediaPlayer mp) {
switch (playMode) {
case 0://顺序播放
index++;
if (index >= musicList.size()) {
Toast.makeText(PlayActivity.this, "没有更多歌曲了", Toast.LENGTH_SHORT).show();
return;
}
playMusic(index);
break;
case 1://随机播放
if (!musicList.isEmpty()) {
index = random.nextInt(musicList.size());
System.out.println(index);
playMusic(index);
}
break;
case 2://单曲循环
mediaPlayer.seekTo(0);
mediaPlayer.start();
break;
}
}
}
}
写在最后
这算是安卓学习过程中，到目前为止比较有成就感的几次中的一次啦，嘻嘻(●’◡’●)