Android Studio初学者实例：仿网易音乐播放器

本期带来的是以Service为主要的知识点的网易音乐播放器

看一下效果图

 首先项目准备：

在res下新建raw文件夹，并在文件夹中添加喜爱的mp3音乐

 OK，第一步，先写一个背景文件，在res/drawable文件夹中新建xml文件：

btn_bg_selector.xml

 编写主界面代码activity_main.xml

xmlns:app="http://schemas.android.com/apk/res-auto"

xmlns:tools="http://schemas.android.com/tools"

android:layout_width="match_parent"

android:layout_height="match_parent"

android:orientation="vertical"

android:gravity="center"

android:background="@drawable/music_bg"

tools:context=".MainActivity">

android:layout_width="match_parent"

android:layout_height="160dp">

android:layout_width="300dp"

android:layout_height="70dp"

android:id="@+id/rl_title"

android:layout_centerHorizontal="true"

android:background="@drawable/title_bg"

android:gravity="center_horizontal"

android:paddingLeft="80dp">

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:id="@+id/tv_music_title"

android:layout_marginTop="8dp"

android:text="体面"

android:textSize="12sp"

android:textStyle="bold"

android:textColor="@color/black"/>

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:id="@+id/tv_type"

android:layout_marginTop="4dp"

android:layout_below="@id/tv_music_title"

android:layout_alignLeft="@id/tv_music_title"

android:text="流行音乐"

android:textSize="10dp"/>

android:layout_width="150dp"

android:layout_height="wrap_content"

android:id="@+id/sb"

android:layout_below="@+id/rl_time"

android:layout_alignParentBottom="true"

android:thumb="@null"/>

android:layout_width="150dp"

android:layout_height="wrap_content"

android:layout_marginTop="4dp"

android:id="@+id/rl_time"

android:layout_below="@id/tv_type">

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:id="@+id/tv_progress"

android:text="00:00"

android:textSize="10dp"/>

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:id="@+id/tv_total"

android:layout_alignParentRight="true"

android:text="00:00"/>

android:layout_width="340dp"

android:layout_height="90dp"

android:layout_below="@id/rl_title"

android:layout_centerHorizontal="true"

android:background="@drawable/btn_bg"

android:gravity="center_vertical"

android:paddingLeft="120dp"

android:paddingRight="10dp">

android:layout_width="0dp"

android:layout_height="25dp"

android:layout_margin="4dp"

android:id="@+id/btn_play"

android:layout_weight="1"

android:background="@drawable/btn_bg_selector"

android:text="播放"

android:textSize="10sp"/>

android:layout_width="0dp"

android:layout_height="25dp"

android:id="@+id/btn_pause"

android:layout_margin="4dp"

android:layout_weight="1"

android:background="@drawable/btn_bg_selector"

android:text="暂停"

android:textSize="10sp"/>

android:layout_width="0dp"

android:layout_height="25dp"

android:id="@+id/btn_continue_play"

android:layout_margin="4dp"

android:layout_weight="1"

android:background="@drawable/btn_bg_selector"

android:text="继续"

android:textSize="10sp"/>

android:layout_width="0dp"

android:layout_height="25dp"

android:id="@+id/btn_exit"

android:layout_margin="4dp"

android:layout_weight="1"

android:background="@drawable/btn_bg_selector"

android:text="退出"

android:textSize="10sp"/>

android:layout_width="100dp"

android:layout_height="100dp"

android:id="@+id/iv_music"

android:layout_centerVertical="true"

android:layout_marginLeft="35dp"

android:layout_marginBottom="50dp"

android:src="@drawable/img_music"/>

编写MusicService

import android.app.Service;

import android.content.Intent;

import android.media.MediaPlayer;

import android.os.Binder;

import android.os.Bundle;

import android.os.IBinder;

import android.os.Message;

import androidx.annotation.Nullable;

import java.util.Timer;

import java.util.TimerTask;

public class MusicService extends Service {

private MediaPlayer player;

private Timer timer;

public MusicService(){

}

@Nullable

@Override

public IBinder onBind(Intent intent) {

return new MusicControl();

}

@Override

public void onCreate() {

super.onCreate();

player=new MediaPlayer();

}

public void addTimer(){

if (timer==null){

timer=new Timer();

TimerTask task=new TimerTask() {

@Override

public void run() {

if (player==null)return;

int duration=player.getDuration();

int currentPosition=player.getCurrentPosition();

Message msg=MainActivity.handler.obtainMessage();

Bundle bundle=new Bundle();

bundle.putInt("duration",duration);

bundle.putInt("currentPosition",currentPosition);

msg.setData(bundle);

MainActivity.handler.sendMessage(msg);

}

};

timer.schedule(task,5,500);

}

}

class MusicControl extends Binder{

public void play(){

try{

player.reset();

player=MediaPlayer.create(getApplicationContext(),R.raw.music);

addTimer();

}catch (Exception e){

e.printStackTrace();

}

}

public void pausePlay(){

player.pause();

}

public void continuePlay(){

player.start();

}

public void seekTo(int progress){

player.seekTo(progress);

}

}

@Override

public void onDestroy() {

super.onDestroy();

if (player==null)return;

if (player.isPlaying())player.stop();

player.release();

player=null;

}

}

注意：检查AndroidManifest.xml文件中是否注册了Service

android:enabled="true"

android:exported="true"/>

编写主界面逻辑代码MainActivity

import androidx.annotation.NonNull;

import androidx.appcompat.app.AppCompatActivity;

import android.animation.ObjectAnimator;

import android.animation.ValueAnimator;

import android.content.ComponentName;

import android.content.Intent;

import android.content.ServiceConnection;

import android.os.Bundle;

import android.os.Handler;

import android.os.IBinder;

import android.os.Message;

import android.view.View;

import android.view.animation.LinearInterpolator;

import android.widget.ImageView;

import android.widget.SeekBar;

import android.widget.TextView;

public class MainActivity extends AppCompatActivity implements View.OnClickListener {

private static SeekBar sb;

private static TextView tv_progress,tv_total;

private ObjectAnimator animator;

private MusicService.MusicControl musicControl;

MyServiceConn conn;

Intent intent;

private boolean isUnbind=false;

@Override

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_main);

init();

}

private void init(){

tv_progress=findViewById(R.id.tv_progress);

tv_total=findViewById(R.id.tv_total);

sb=findViewById(R.id.sb);

findViewById(R.id.btn_play).setOnClickListener(this);

findViewById(R.id.btn_pause).setOnClickListener(this);

findViewById(R.id.btn_continue_play).setOnClickListener(this);

findViewById(R.id.btn_exit).setOnClickListener(this);

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

conn=new MyServiceConn();

bindService(intent,conn,BIND_AUTO_CREATE);

sb.setOnSeekBarChangeListener(new SeekBar.OnSeekBarChangeListener() {

@Override

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

if (progress==seekBar.getMax()){

animator.pause();

}

}

@Override

public void onStartTrackingTouch(SeekBar seekBar) {

}

@Override

public void onStopTrackingTouch(SeekBar seekBar) {

int progress=seekBar.getProgress();

musicControl.seekTo(progress);

}

});

ImageView iv_music = (ImageView) findViewById(R.id.iv_music);

animator = ObjectAnimator.ofFloat(iv_music, "rotation", 0f, 360.0f);

animator.setDuration(10000); //动画旋转一周的时间为10秒

animator.setInterpolator(new LinearInterpolator());

animator.setRepeatCount(-1); //-1表示设置动画无限循环

}

public static Handler handler=new Handler(){

@Override

public void handleMessage(@NonNull Message msg) {

Bundle bundle=msg.getData();

int duration=bundle.getInt("duration");

int currentPosition=bundle.getInt("currentPosition");

sb.setMax(duration);

sb.setProgress(currentPosition);

int minute=duration/1000/60;

int second=duration/1000%60;

String strMinute=null;

String strSecond=null;

if (minute<10){

strMinute="0"+minute;

}else {

strMinute=minute+"";

}

if (second<10){

strSecond="0"+second;

}else {

strSecond=second+"";

}

tv_total.setText(strMinute+":"+strSecond);

minute=currentPosition/1000/60;

second=currentPosition/1000%60;

if (minute<10){

strMinute="0"+minute;

}else {

strMinute=minute+"";

}

if (second<10){

strSecond="0"+second;

}else {

strSecond=second+"";

}

tv_progress.setText(strMinute+":"+strSecond);

super.handleMessage(msg);

}

};

class MyServiceConn implements ServiceConnection{

@Override

public void onServiceConnected(ComponentName name, IBinder service) {

musicControl= (MusicService.MusicControl) service;

}

@Override

public void onServiceDisconnected(ComponentName name) {

}

}

private void unbind(boolean isUnbind){

if (!isUnbind){

musicControl.pausePlay();

unbindService(conn);

stopService(intent);

}

}

@Override

public void onClick(View v) {

switch (v.getId()){

case R.id.btn_play:

musicControl.play();

animator.start();

break;

case R.id.btn_pause:

musicControl.pausePlay();

animator.pause();

break;

case R.id.btn_continue_play:

musicControl.continuePlay();

animator.start();

break;

case R.id.btn_exit:

unbind(isUnbind);

isUnbind=true;

finish();

break;

}

}

@Override

protected void onDestroy() {

super.onDestroy();

unbind(isUnbind);

}

}

期末比较繁忙，讲解后续补充，如有问题私信、评论联系

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