Android MP3播放器实例--------MusicActivity类以及MusicService类详细讲解

这两个类是此播放器中最重要的实现代码逻辑的两个类，其实代码很简单 只是一些简单的播放器的逻辑实现。

package music.mic.act;

import java.util.List;

import music.mic.mic.Music;

import music.mic.util.LrcView;

import music.mic.util.MusicList;

import android.app.Activity;

import android.content.BroadcastReceiver;

import android.content.Context;

import android.content.DialogInterface;

import android.content.Intent;

import android.content.IntentFilter;

import android.hardware.Sensor;

import android.hardware.SensorEvent;

import android.hardware.SensorEventListener;

import android.hardware.SensorManager;

import android.media.AudioManager;

import android.os.Bundle;

import android.telephony.PhoneStateListener;

import android.telephony.TelephonyManager;

import android.util.Log;

import android.view.View;

import android.view.View.OnClickListener;

import android.view.Window;

import android.view.WindowManager;

import android.widget.ImageButton;

import android.widget.ImageView;

import android.widget.SeekBar;

import android.widget.TextView;

import android.widget.SeekBar.OnSeekBarChangeListener;

public class MusicActivity extends Activity implements SensorEventListener {

private TextView textName;

private TextView textSinger;

private TextView textStartTime;

private TextView textEndTime;

private ImageButton imageBtnLast;

private ImageButton imageBtnRewind;

public static ImageButton imageBtnPlay;

private ImageButton imageBtnForward;

private ImageButton imageBtnNext;

private ImageButton imageBtnLoop;

private ImageButton imageBtnRandom;

public static LrcView lrc_view;

private ImageView icon;

private SeekBar seekBar1;

private AudioManager audioManager;// 音量管理者

private int maxVolume;// 最大音量

private int currentVolume;// 当前音量

private SeekBar seekBarVolume;

private List<Music> lists;

private Boolean isPlaying = false;

private static int id = 1;

private static int currentId = 2;

private static Boolean replaying = false;

private MyProgressBroadCastReceiver receiver;

private MyCompletionListner completionListner;

public static Boolean isLoop = true;

private SensorManager sensorManager;

private boolean mRegisteredSensor;

@Override

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

//第一篇我们已经讲过设置window的属性，以及与setContent顺序问题。这里就不在多说。

requestWindowFeature(Window.FEATURE_NO_TITLE);

this.getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN, WindowManager.LayoutParams.FLAG_FULLSCREEN);

setContentView(R.layout.music);

//通过id找到所有的控件

textName = (TextView) this.findViewById(R.id.music_name);

textSinger = (TextView) this.findViewById(R.id.music_singer);

textStartTime = (TextView) this.findViewById(R.id.music_start_time);

textEndTime = (TextView) this.findViewById(R.id.music_end_time);

seekBar1 = (SeekBar) this.findViewById(R.id.music_seekBar);

// icon = (ImageView) this.findViewById(R.id.image_icon);

imageBtnLast = (ImageButton) this.findViewById(R.id.music_lasted);

imageBtnRewind = (ImageButton) this.findViewById(R.id.music_rewind);

imageBtnPlay = (ImageButton) this.findViewById(R.id.music_play);

imageBtnForward = (ImageButton) this.findViewById(R.id.music_foward);

imageBtnNext = (ImageButton) this.findViewById(R.id.music_next);

imageBtnLoop = (ImageButton) this.findViewById(R.id.music_loop);

seekBarVolume = (SeekBar) this.findViewById(R.id.music_volume);

imageBtnRandom = (ImageButton) this.findViewById(R.id.music_random);

lrc_view = (LrcView) findViewById(R.id.LyricShow);

//为imageButton设置监听MylIstener()

imageBtnLast.setOnClickListener(new MyListener());

imageBtnRewind.setOnClickListener(new MyListener());

imageBtnPlay.setOnClickListener(new MyListener());

imageBtnForward.setOnClickListener(new MyListener());

imageBtnNext.setOnClickListener(new MyListener());

imageBtnLoop.setOnClickListener(new MyListener());

imageBtnRandom.setOnClickListener(new MyListener());

//设置重力感应这个我没有测试 因为没有真机。。。各位有真机的可以试试

sensorManager = (SensorManager) getSystemService(SENSOR_SERVICE);

//得到歌曲列表

lists = MusicList.getMusicData(this);

//得到AudioManager对象

audioManager = (AudioManager) getSystemService(Context.AUDIO_SERVICE);

maxVolume = audioManager.getStreamMaxVolume(AudioManager.STREAM_MUSIC);// 获得最大音量

currentVolume = audioManager.getStreamVolume(AudioManager.STREAM_MUSIC);// 获得当前音量

//设置音量

seekBarVolume.setMax(maxVolume);

seekBarVolume.setProgress(currentVolume);

//这里的音量也是一个可拖动的进度条，所以要加监听实现功能。

seekBarVolume.setOnSeekBarChangeListener(new OnSeekBarChangeListener() {

@Override

public void onStopTrackingTouch(SeekBar seekBar) {

// TODO Auto-generated method stub

}

@Override

public void onStartTrackingTouch(SeekBar seekBar) {

// TODO Auto-generated method stub

}

@Override

public void onProgressChanged(SeekBar seekBar, int progress, boolean fromUser) {

// TODO Auto-generated method stub

audioManager.setStreamVolume(AudioManager.STREAM_MUSIC, progress, AudioManager.FLAG_ALLOW_RINGER_MODES);

}

});

// 电话状态监听

TelephonyManager telManager = (TelephonyManager) getSystemService(Context.TELEPHONY_SERVICE);

telManager.listen(new MobliePhoneStateListener(), PhoneStateListener.LISTEN_CALL_STATE);

seekBar1.setOnSeekBarChangeListener(new OnSeekBarChangeListener() {

@Override

public void onStopTrackingTouch(SeekBar seekBar) {

// TODO Auto-generated method stub

seekBar1.setProgress(seekBar.getProgress());

Intent intent = new Intent("music.mic.seekBar");

intent.putExtra("seekBarPosition", seekBar.getProgress());

// System.out.println("==========="+seekBar.getProgress());

sendBroadcast(intent);

}

@Override

public void onStartTrackingTouch(SeekBar seekBar) {

// TODO Auto-generated method stub

}

@Override

public void onProgressChanged(SeekBar seekBar, int progress, boolean fromUser) {

// TODO Auto-generated method stub

}

});

completionListner = new MyCompletionListner();

IntentFilter filter = new IntentFilter("music.mic.completion");

//注册广播接收器

this.registerReceiver(completionListner, filter);

}

private class MobliePhoneStateListener extends PhoneStateListener {

@Override

public void onCallStateChanged(int state, String incomingNumber) {

switch (state) {

case TelephonyManager.CALL_STATE_IDLE: /* 无任何状态时 */

Intent intent = new Intent(MusicActivity.this, MusicService.class);

intent.putExtra("play", "playing");

intent.putExtra("id", id);

startService(intent);

isPlaying = true;

imageBtnPlay.setImageResource(R.drawable.pause1);

replaying = true;

break;

case TelephonyManager.CALL_STATE_OFFHOOK: /* 接起电话时 */

case TelephonyManager.CALL_STATE_RINGING: /* 电话进来时 */

Intent intent2 = new Intent(MusicActivity.this, MusicService.class);

intent2.putExtra("play", "pause");

startService(intent2);

isPlaying = false;

imageBtnPlay.setImageResource(R.drawable.play1);

replaying = false;

break;

default:

break;

}

}

}

//以下是一个Activity每个生命周期的每个阶段内处理的函数

@Override

protected void onStart() {

// TODO Auto-generated method stub

super.onStart();

receiver = new MyProgressBroadCastReceiver();

IntentFilter filter = new IntentFilter("music.mic.progress");

this.registerReceiver(receiver, filter);

id = getIntent().getIntExtra("id", 1);

if (id == currentId) {

Music m = lists.get(id);

textName.setText(m.getTitle());

textSinger.setText(m.getSinger());

textEndTime.setText(toTime((int) m.getTime()));

//通过Intent将参数等传递到Service中进行处理

Intent intent = new Intent(MusicActivity.this, MusicService.class);

intent.putExtra("play", "replaying");

intent.putExtra("id", id);

startService(intent);

if (replaying == true) {

imageBtnPlay.setImageResource(R.drawable.pause1);

// /replaying=false;

isPlaying = true;

} else {

imageBtnPlay.setImageResource(R.drawable.play1);

// replaying=true;

isPlaying = false;

}

} else {

Music m = lists.get(id);

textName.setText(m.getTitle());

textSinger.setText(m.getSinger());

textEndTime.setText(toTime((int) m.getTime()));

imageBtnPlay.setImageResource(R.drawable.pause1);

Intent intent = new Intent(MusicActivity.this, MusicService.class);

intent.putExtra("play", "play");

intent.putExtra("id", id);

startService(intent);

isPlaying = true;

replaying = true;

currentId = id;

}

}

//重力感应

@Override

protected void onResume() {

// TODO Auto-generated method stub

super.onResume();

List<Sensor> sensors = sensorManager.getSensorList(Sensor.TYPE_ACCELEROMETER);

if (sensors.size() > 0) {

Sensor sensor = sensors.get(0);

mRegisteredSensor = sensorManager.registerListener(this, sensor, SensorManager.SENSOR_DELAY_FASTEST);

Log.e("--------------", sensor.getName());

}

}

@Override

protected void onPause() {

// TODO Auto-generated method stub

if (mRegisteredSensor) {

sensorManager.unregisterListener(this);

mRegisteredSensor = false;

}

super.onPause();

}

@Override

protected void onDestroy() {

// TODO Auto-generated method stub

this.unregisterReceiver(receiver);

this.unregisterReceiver(completionListner);

super.onDestroy();

}

//广播接收器

public class MyProgressBroadCastReceiver extends BroadcastReceiver {

@Override

public void onReceive(Context context, Intent intent) {

// TODO Auto-generated method stub

int position = intent.getIntExtra("position", 0);

int total = intent.getIntExtra("total", 0);

int progress = position * 100 / total;

textStartTime.setText(toTime(position));

seekBar1.setProgress(progress);

seekBar1.invalidate();

}

}

//按钮监听实现分别对不同的按钮进行设置监听方法 ，这里唯一需要注意就是上一首，下一首的逻辑判断 也非常简单。

private class MyListener implements OnClickListener {

public void onClick(View v) {

if (v == imageBtnLast) {

// 第一首

id = 0;

Music m = lists.get(0);

textName.setText(m.getTitle());

textSinger.setText(m.getSinger());

textEndTime.setText(toTime((int) m.getTime()));

imageBtnPlay.setImageResource(R.drawable.pause1);

Intent intent = new Intent(MusicActivity.this, MusicService.class);

intent.putExtra("play", "first");

intent.putExtra("id", id);

startService(intent);

isPlaying = true;

} else if (v == imageBtnRewind) {

// 前一首

int id = MusicService._id - 1;

if (id >= lists.size() - 1) {

id = lists.size() - 1;

} else if (id <= 0) {

id = 0;

}

Music m = lists.get(id);

textName.setText(m.getTitle());

textSinger.setText(m.getSinger());

textEndTime.setText(toTime((int) m.getTime()));

imageBtnPlay.setImageResource(R.drawable.pause1);

Intent intent = new Intent(MusicActivity.this, MusicService.class);

intent.putExtra("play", "rewind");

intent.putExtra("id", id);

startService(intent);

isPlaying = true;

} else if (v == imageBtnPlay) {

// 正在播放

if (isPlaying == true) {

Intent intent = new Intent(MusicActivity.this, MusicService.class);

intent.putExtra("play", "pause");

startService(intent);

isPlaying = false;

imageBtnPlay.setImageResource(R.drawable.play1);

replaying = false;

} else {

Intent intent = new Intent(MusicActivity.this, MusicService.class);

intent.putExtra("play", "playing");

intent.putExtra("id", id);

startService(intent);

isPlaying = true;

imageBtnPlay.setImageResource(R.drawable.pause1);

replaying = true;

}

} else if (v == imageBtnForward) {

// 下一首

int id = MusicService._id + 1;

if (id >= lists.size() - 1) {

id = lists.size() - 1;

} else if (id <= 0) {

id = 0;

}

Music m = lists.get(id);

textName.setText(m.getTitle());

textSinger.setText(m.getSinger());

textEndTime.setText(toTime((int) m.getTime()));

imageBtnPlay.setImageResource(R.drawable.pause1);

Intent intent = new Intent(MusicActivity.this, MusicService.class);

intent.putExtra("play", "forward");

intent.putExtra("id", id);

startService(intent);

isPlaying = true;

} else if (v == imageBtnNext) {

// 最后一首

int id = lists.size() - 1;

Music m = lists.get(id);

textName.setText(m.getTitle());

textSinger.setText(m.getSinger());

textEndTime.setText(toTime((int) m.getTime()));

imageBtnPlay.setImageResource(R.drawable.pause1);

Intent intent = new Intent(MusicActivity.this, MusicService.class);

intent.putExtra("play", "last");

intent.putExtra("id", id);

startService(intent);

isPlaying = true;

} else if (v == imageBtnLoop) {

if (isLoop == true) {

// 顺序播放

imageBtnLoop.setBackgroundResource(R.drawable.play_loop_spec);

isLoop = false;

} else {

// 单曲播放

imageBtnLoop.setBackgroundResource(R.drawable.play_loop_sel);

isLoop = true;

}

} else if (v == imageBtnRandom) {

imageBtnRandom.setImageResource(R.drawable.play_random_sel);

}

}

}

private class MyCompletionListner extends BroadcastReceiver {

@Override

public void onReceive(Context context, Intent intent) {

// TODO Auto-generated method stub

Music m = lists.get(MusicService._id);

textName.setText(m.getTitle());

textSinger.setText(m.getSinger());

textEndTime.setText(toTime((int) m.getTime()));

imageBtnPlay.setImageResource(R.drawable.pause1);

}

}

public String toTime(int time) {

time /= 1000;

int minute = time / 60;

int hour = minute / 60;

int second = time % 60;

return String.format("%02d:%02d", minute, second);

}

// 重力感应 甩歌代码

private static final int SHAKE_THRESHOLD = 3000;

private long lastUpdate = 0;

private double last_x = 0;

private double last_y = 4.50;

private double last_z = 9.50;

// 这个控制精度，越小表示反应越灵敏

@Override

public void onAccuracyChanged(Sensor sensor, int accuracy) {

// TODO Auto-generated method stub

// 处理精准度改变

}

@Override

public void onSensorChanged(SensorEvent event) {

// TODO Auto-generated method stub

if (event.sensor.getType() == Sensor.TYPE_ACCELEROMETER) {

long curTime = System.currentTimeMillis();

// 每200毫秒检测一次

if ((curTime - lastUpdate) > 100) {

long diffTime = (curTime - lastUpdate);

lastUpdate = curTime;

double x = event.values[SensorManager.DATA_X];

double y = event.values[SensorManager.DATA_Y];

double z = event.values[SensorManager.DATA_Z];

Log.e("---------------", "x=" + x + " y=" + y + " z=" + z);

float speed = (float) (Math.abs(x + y + z - last_x - last_y - last_z) / diffTime * 10000);

if (speed > SHAKE_THRESHOLD) {

// 检测到摇晃后执行的代码

if (MusicService.playing == true) {

Intent intent = new Intent(MusicActivity.this, MusicService.class);

intent.putExtra("play", "pause");

startService(intent);

isPlaying = false;

imageBtnPlay.setImageResource(R.drawable.play1);

replaying = false;

} else {

Intent intent = new Intent(MusicActivity.this, MusicService.class);

intent.putExtra("play", "playing");

intent.putExtra("id", id);

startService(intent);

isPlaying = true;

imageBtnPlay.setImageResource(R.drawable.pause1);

replaying = true;

}

}

last_x = x;

last_y = y;

last_z = z;

}

}

}

}