這篇文章將為大家詳細講解有關在Android怎么快速完成簡易的音樂播放器,小編覺得挺實用的,因此分享給大家做個參考,希望大家閱讀完這篇文章后可以有所收獲。
導入項目所需的音樂文件、圖標、背景等
1.創建一個raw文件夾,將音樂文件導入到這個文件夾中,方便我們在項目中使用
2.在drawable中導入所需的圖片、圖標
設計UI界面
1.設計5個button控件,分別對應上一曲,下一曲,暫停,播放,退出
2.設計3個TextView,分別對應歌曲的介紹信息、歌曲的進度(歌曲的總時間和歌曲當前播放的時間)、歌曲的名字
service服務的編寫
創建一個MusicService對象繼承Service
MusicService所需要的成員變量
MyReceiver serviceReceiver;
Thread processThread;
AssetManager am;//是附件管理器,用于根據文件名找到文件所在并打開文件
String[] musics = new String[]{"legendsneverdie.mp3", "promise.mp3",
"beautiful.mp3"};//默認顯示的歌曲信息
MediaPlayer mPlayer;
// 當前的狀態,0x11代表沒有播放;0x12代表正在播放;0x13代表暫停
int status = 0x11;
// 記錄當前正在播放的音樂
int current = 0;實現循環播放
public void onCreate() {
super.onCreate();
am = getAssets();
// 創建BroadcastReceiver
serviceReceiver = new MyReceiver();
// 創建IntentFilter
IntentFilter filter = new IntentFilter();
filter.addAction(MainActivity.CTL_ACTION);
registerReceiver(serviceReceiver, filter);
// 創建MediaPlayer
mPlayer = new MediaPlayer();
// 為MediaPlayer播放完成事件綁定監聽器
mPlayer.setOnCompletionListener(new OnCompletionListener()
{
@Override
public void onCompletion(MediaPlayer mp) {
Log.d("musicService", "播放完成");
current++;
if (current >= 3) {
current = 0;
}
// 準備并播放音樂
prepareAndPlay(musics[current]);
//發送廣播通知Activity更改文本框
Intent sendIntent = new Intent(MainActivity.UPDATE_ACTION);
sendIntent.putExtra("current", current);
sendIntent.putExtra("currentTime", mPlayer.getCurrentPosition());
sendIntent.putExtra("totalTime", mPlayer.getDuration());
// 發送廣播,將被Activity組件中的BroadcastReceiver接收到
sendBroadcast(sendIntent);
}
});
private void prepareAndPlay(String music) {
try {
// 打開指定音樂文件
AssetFileDescriptor afd = am.openFd(music);
mPlayer.reset();
// 使用MediaPlayer加載指定的聲音文件。
mPlayer.setDataSource(afd.getFileDescriptor(),
afd.getStartOffset(), afd.getLength());
// 準備聲音
mPlayer.prepare();
// 播放
mPlayer.start();
} catch (IOException e) {
e.printStackTrace();
}
}實現刷新進度條
processThread = new Thread(new Runnable() {
@Override
public void run() {
while (true) {
if (status == 0x12) {
try {
Thread.sleep(1000);
Intent sendIntent = new Intent(MainActivity.UPDATE_ACTION);
sendIntent.putExtra("current", current);
sendIntent.putExtra("currentTime", mPlayer.getCurrentPosition());
sendIntent.putExtra("totalTime", mPlayer.getDuration());
// 發送廣播,將被Activity組件中的BroadcastReceiver接收到
sendBroadcast(sendIntent);
} catch (InterruptedException e) {
e.printStackTrace();
}
}
}
}
});
processThread.start();
}廣播通信接收器的實現(用于實現和activity的通信)
public class MyReceiver extends BroadcastReceiver {
@Override
public void onReceive(final Context context, Intent intent) {
int control = intent.getIntExtra("control", -1);
Log.d("musicReceiver", "收到廣播, control=" + control);
switch (control) {
// 播放或暫停
case 1:
// 原來處于沒有播放狀態
if (status == 0x11) {
// 準備并播放音樂
prepareAndPlay(musics[current]);
status = 0x12;
}
// 原來處于播放狀態
else if (status == 0x12) {
// 暫停
mPlayer.pause();
// 改變為暫停狀態
status = 0x13;
}
// 原來處于暫停狀態
else if (status == 0x13) {
// 播放
mPlayer.start();
// 改變狀態
status = 0x12;
}
break;
// 下一首
case 2:
if (status == 0x12 || status == 0x13) {
mPlayer.stop();
if (current + 1 >= musics.length) {
current = 0;
} else {
current++;
}
prepareAndPlay(musics[current]);
status = 0x12;
break;
}
// 上一首
case 3:
if (status == 0x12 || status == 0x13) {
mPlayer.stop();
if (current - 1 < 0) {
current = musics.length - 1;
} else {
current--;
}
prepareAndPlay(musics[current]);
status = 0x12;
}
}
// 廣播通知Activity更改圖標、文本框
Intent sendIntent = new Intent(MainActivity.UPDATE_ACTION);
sendIntent.putExtra("update", status);
sendIntent.putExtra("current", current);
// 發送廣播,將被Activity組件中的BroadcastReceiver接收到
sendBroadcast(sendIntent);
}
}activity的實現
初始化和動態綁定接收器
// 獲取界面中顯示歌曲標題、作者文本框
TextView title, author, currentTime, totalTime;
// 播放/暫停、停止按鈕
ImageButton play;
ImageView lastMusic, nextMusic;
// 進度條
ProgressBar progressBar;
ActivityReceiver activityReceiver;
public static final String CTL_ACTION =
"org.xr.action.CTL_ACTION";
public static final String UPDATE_ACTION =
"org.xr.action.UPDATE_ACTION";
// 定義音樂的播放狀態,0x11代表沒有播放;0x12代表正在播放;0x13代表暫停
int status = 0x11;
String[] titleStrs = new String[]{"Legends Never Die", "約定", "美麗新世界"};
String[] authorStrs = new String[]{"英雄聯盟", "周蕙", "伍佰"};
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
// 獲取程序界面界面中的兩個按鈕
play = (ImageButton) this.findViewById(R.id.play);
lastMusic = this.findViewById(R.id.lastMusic);
nextMusic = this.findViewById(R.id.nextMusic);
title = (TextView) findViewById(R.id.title);
author = (TextView) findViewById(R.id.author);
currentTime = findViewById(R.id.currentTime);
totalTime = findViewById(R.id.totalTime);
progressBar = findViewById(R.id.progressBar);
// 為兩個按鈕的單擊事件添加監聽器
play.setOnClickListener(this);
lastMusic.setOnClickListener(this);
nextMusic.setOnClickListener(this);
activityReceiver = new ActivityReceiver();
// 創建IntentFilter
IntentFilter filter = new IntentFilter();
// 指定BroadcastReceiver監聽的Action
filter.addAction(UPDATE_ACTION);
// 注冊BroadcastReceiver
registerReceiver(activityReceiver, filter);
Intent intent = new Intent(this, MusicService.class);
// 啟動后臺Service
startService(intent);
}設置activity的廣播接收器(接收service發送過來的廣播)
public void onReceive(Context context, Intent intent) {
// 獲取Intent中的update消息,update代表播放狀態
int update = intent.getIntExtra("update", -1);
// 獲取Intent中的current消息,current代表當前正在播放的歌曲
int current = intent.getIntExtra("current", -1);
int totalPosition = intent.getIntExtra("totalTime", -1);
int currentPosition = intent.getIntExtra("currentTime", -1);
Log.d("activityReceiver", "收到廣播");
Log.d("activityReceiver", "current:" + current + " totalPosition:" + totalPosition + " currentPosition:" + currentPosition + " update:" + update);
if (current >= 0) {
title.setText(titleStrs[current]);
author.setText(authorStrs[current]);
}
if (totalPosition >= 0) {
SimpleDateFormat simpleDateFormat = new SimpleDateFormat("mm:ss", Locale.CHINA);
Date date = new Date(totalPosition);
String formatTime = simpleDateFormat.format(date);
totalTime.setText(formatTime);
}
if (currentPosition >= 0) {
double process = ((double)currentPosition / totalPosition)*100;
Log.d("activityReceiver", "當前進度:" + (double)currentPosition/totalPosition);
SimpleDateFormat simpleDateFormat = new SimpleDateFormat("mm:ss", Locale.CHINA);
Date date = new Date(currentPosition);
String formatTime = simpleDateFormat.format(date);
progressBar.setProgress((int) process);
currentTime.setText(formatTime);
}
switch (update) {
case 0x11:
play.setImageResource(R.drawable.play);
status = 0x11;
break;
// 控制系統進入播放狀態
case 0x12:
// 播放狀態下設置使用暫停圖標
play.setImageResource(R.drawable.pause);
// 設置當前狀態
status = 0x12;
break;
// 控制系統進入暫停狀態
case 0x13:
// 暫停狀態下設置使用播放圖標
play.setImageResource(R.drawable.play);
// 設置當前狀態
status = 0x13;
break;
}
}實現圖標的點擊功能
// 創建Intent
Intent intent = new Intent("org.xr.action.CTL_ACTION");
switch (source.getId()) {
// 按下播放/暫停按鈕
case R.id.play:
intent.putExtra("control", 1);
break;
case R.id.lastMusic:
intent.putExtra("control", 3);
case R.id.nextMusic:
intent.putExtra("control", 2);
}
// 發送廣播,將被Service組件中的BroadcastReceiver接收到
sendBroadcast(intent);
}關于“在Android怎么快速完成簡易的音樂播放器”這篇文章就分享到這里了,希望以上內容可以對大家有一定的幫助,使各位可以學到更多知識,如果覺得文章不錯,請把它分享出去讓更多的人看到。
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