資源分布圖

MainActivity代碼

package com.example.music;import androidx.annotation.NonNull; import androidx.appcompat.app.AppCompatActivity;import android.animation.ObjectAnimator; 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;@Overrideprotected 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() {@Overridepublic void onProgressChanged(SeekBar seekBar, int progress, boolean b) {if (progress == seekBar.getMax()){animator.pause();}}@Overridepublic void onStartTrackingTouch(SeekBar seekBar) {}@Overridepublic void onStopTrackingTouch(SeekBar seekBar) {int progress = seekBar.getProgress();musicControl.seekTo(progress);}});ImageView iv_music = findViewById(R.id.iv_music);animator = ObjectAnimator.ofFloat(iv_music,"rotation",0f,360.0f);animator.setDuration(10000);animator.setInterpolator(new LinearInterpolator());animator.setRepeatCount(-1);}public static Handler handler = new Handler(){@Overridepublic 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);}};class MyServiceConn implements ServiceConnection{@Overridepublic void onServiceConnected(ComponentName name, IBinder service) {musicControl = (MusicService.MusicControl)service;}@Overridepublic void onServiceDisconnected(ComponentName name) {}}private void unbind(boolean isUnbind){if (!isUnbind){musicControl.pausePlay();unbindService(conn);stopService(intent);}}@Overridepublic void onClick(View view) {switch (view.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;}}@Overrideprotected void onDestroy() {super.onDestroy();unbind(isUnbind);} }

MusicService代碼

package com.example.music;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 java.util.Timer; import java.util.TimerTask;public class MusicService extends Service {private MediaPlayer player;private Timer timer;public MusicService() {}@Overridepublic IBinder onBind(Intent intent) {return new MusicControl();}@Overridepublic void onCreate() {super.onCreate();player = new MediaPlayer();}public void addTimer(){if (timer == null){timer = new Timer();TimerTask task = new TimerTask() {@Overridepublic 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);player.start();addTimer();}catch (Exception e){e.printStackTrace();}}public void pausePlay(){player.pause();}public void continuePlay(){player.start();}public void seekTo(int progress){player.seekTo(progress);}}@Overridepublic void onDestroy() {super.onDestroy();if (player == null) return;if (player.isPlaying()) player.stop();player.release();player = null;} }

drawable資源
btn_bg_selector.xml

<?xml version="1.0" encoding="utf-8"?> <selector xmlns:android="http://schemas.android.com/apk/res/android"><item android:state_pressed="true"><shape android:shape="rectangle"><corners android:radius="3dp"/><solid android:color="#d4d4d4"/></shape></item><item android:state_pressed="false"><shape android:shape="rectangle"><corners android:radius="3dp"/><solid android:color="#ffffff"/></shape></item> </selector>

activity_main.xml

<?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"android:layout_width="match_parent"android:layout_height="match_parent"android:background="@drawable/music_bg"android:gravity="center"android:orientation="vertical"><ImageViewandroid:id="@+id/iv_music"android:layout_width="240dp"android:layout_height="240dp"android:layout_gravity="center_horizontal"android:layout_margin="15dp"android:src="@drawable/music"/><SeekBarandroid:id="@+id/sb"android:layout_width="match_parent"android:layout_height="wrap_content"/><RelativeLayoutandroid:layout_width="match_parent"android:layout_height="wrap_content"android:paddingLeft="8dp"android:paddingRight="8dp"><TextViewandroid:id="@+id/tv_progress"android:layout_width="wrap_content"android:layout_height="wrap_content"android:text="00:00"/><TextViewandroid:id="@+id/tv_total"android:layout_width="wrap_content"android:layout_height="wrap_content"android:layout_alignParentRight="true"android:text="00:00"/> </RelativeLayout> <LinearLayoutandroid:layout_width="match_parent"android:layout_height="wrap_content"android:orientation="horizontal"><Buttonandroid:id="@+id/btn_play"android:layout_width="0dp"android:layout_height="40dp"android:layout_margin="8dp"android:layout_weight="1"android:background="@drawable/btn_bg_selector"android:text="播放音樂"/> <Buttonandroid:id="@+id/btn_pause"android:layout_width="0dp"android:layout_height="40dp"android:layout_margin="8dp"android:layout_weight="1"android:background="@drawable/btn_bg_selector"android:text="暫停播放"/> <Buttonandroid:id="@+id/btn_continue_play"android:layout_width="0dp"android:layout_height="40dp"android:layout_margin="8dp"android:layout_weight="1"android:background="@drawable/btn_bg_selector"android:text="繼續播放"/> <Buttonandroid:id="@+id/btn_exit"android:layout_width="0dp"android:layout_height="40dp"android:layout_margin="8dp"android:layout_weight="1"android:background="@drawable/btn_bg_selector"android:text="退出"/> </LinearLayout> </LinearLayout>

圖片資源


剩下一個資源raw文件里面的音樂文件，放里面一個music名字的mp3文件就行。raw文件自己創建的。

總結

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