Android——音乐播放器完善——进度条显示当前播放进度，加可拖动进度条（未待解决完问题）
效果：
问题：可拖动进度条随进度条移动时，会致使音乐卡顿（待解决）
xml
<?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent" android:layout_height="match_parent" android:paddingBottom="@dimen/activity_vertical_margin" android:paddingLeft="@dimen/activity_horizontal_margin" android:paddingRight="@dimen/activity_horizontal_margin" android:paddingTop="@dimen/activity_vertical_margin" tools:context="com.example.chenshuai.myapplication.ActivityMusic" android:orientation="vertical"> <ProgressBar android:layout_width="match_parent" android:layout_height="wrap_content" style="@android:style/Widget.ProgressBar.Horizontal" android:id="@+id/pb" /> <SeekBar android:layout_width="match_parent" android:layout_height="wrap_content" android:id="@+id/sbr" /> <TextView android:layout_width="match_parent" android:layout_height="40sp" android:text="播放状态" android:textSize="20sp" android:gravity="center_horizontal" android:id="@+id/tv_1"/> <LinearLayout android:layout_width="match_parent" android:layout_height="wrap_content"> <Button android:layout_width="0dp" android:layout_height="wrap_content" android:layout_weight="1" android:text="播放" android:onClick="play_onclick"/> <Button android:layout_width="0dp" android:layout_height="wrap_content" android:layout_weight="1" android:text="暂停" android:onClick="pause_onclick"/> <Button android:layout_width="0dp" android:layout_height="wrap_content" android:layout_weight="1" android:text="停止" android:onClick="stop_onclick"/> <Button android:layout_width="0dp" android:layout_height="wrap_content" android:layout_weight="1" android:text="退出" android:onClick="exit_onclick"/> </LinearLayout> </LinearLayout>
Service
package com.example.chenshuai.myapplication; import android.app.Service; import android.content.Intent; import android.media.MediaPlayer; import android.os.Binder; import android.os.IBinder; public class MyServiceMusic extends Service { public MyServiceMusic() { } public class Mybind extends Binder { //获取歌曲长度 public int getMusicDuration() { int rtn = 0; if (mediaPlayer != null) { rtn = mediaPlayer.getDuration(); } return rtn; } //获取当前播放进度 public int getMusicCurrentPosition() { int rtn = 0; if (mediaPlayer != null) { rtn = mediaPlayer.getCurrentPosition(); } return rtn; } public void seekTo(int position) { if (mediaPlayer != null) { mediaPlayer.seekTo(position); } } } @Override public IBinder onBind(Intent intent) { // TODO: Return the communication channel to the service. //throw new UnsupportedOperationException("Not yet implemented"); return new Mybind(); } private MediaPlayer mediaPlayer; @Override public int onStartCommand(Intent intent, int flags, int startId) { //获取意图传递的信息 String action = intent.getStringExtra("action"); switch (action) { case "play": if (mediaPlayer == null) { mediaPlayer = MediaPlayer.create(this,R.raw.onceagain); } mediaPlayer.start(); break; case "stop": if (mediaPlayer !=null) { mediaPlayer.stop(); mediaPlayer.reset(); mediaPlayer.release(); mediaPlayer = null; } break; case "pause": if (mediaPlayer !=null && mediaPlayer.isPlaying()) { mediaPlayer.pause(); } break; } return super.onStartCommand(intent, flags, startId); } }
java
package com.example.chenshuai.myapplication; import android.content.ComponentName; import android.content.Context; import android.content.Intent; import android.content.ServiceConnection; import android.os.Bundle; import android.os.IBinder; import android.support.v7.app.AppCompatActivity; import android.view.View; import android.widget.ProgressBar; import android.widget.SeekBar; import android.widget.TextView; public class ActivityMusicservice extends AppCompatActivity { TextView tv_1; ProgressBar pb; SeekBar sbr; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_activity_music); tv_1 = (TextView)findViewById(R.id.tv_1); tv_1.setText("播放状态11：停止播放。。。"); pb = (ProgressBar)findViewById(R.id.pb); sbr = (SeekBar)findViewById(R.id.sbr); } ServiceConnection serviceConnection; MyServiceMusic.Mybind mybind; public void play_onclick(View view) { Intent intent = new Intent(this,MyServiceMusic.class); intent.putExtra("action","play"); startService(intent); tv_1.setText("播放状态11：正在播放。。。"); if (serviceConnection == null) { serviceConnection = new ServiceConnection() { @Override public void onServiceConnected(ComponentName name, IBinder service) { mybind = (MyServiceMusic.Mybind) service; //设置进度条的最大长度 int max = mybind.getMusicDuration(); pb.setMax(max); sbr.setMax(max); sbr.setOnSeekBarChangeListener(new SeekBar.OnSeekBarChangeListener() { @Override public void onProgressChanged(SeekBar seekBar, int progress, boolean fromUser) { mybind.seekTo(progress); } @Override public void onStartTrackingTouch(SeekBar seekBar) { } @Override public void onStopTrackingTouch(SeekBar seekBar) { } }); //连接之后启动子线程设置当前进度 new Thread() { public void run() { //改变当前进度条的值 //设置当前进度 while (true) { pb.setProgress(mybind.getMusicCurrentPosition()); // sbr.setProgress(mybind.getMusicCurrentPosition()); try { Thread.sleep(100); } catch (Exception e) { e.printStackTrace(); } } } }.start(); } @Override public void onServiceDisconnected(ComponentName name) { } }; //以绑定方式连接服务 bindService(intent, serviceConnection, Context.BIND_AUTO_CREATE); } } public void stop_onclick(View view) { Intent intent = new Intent(this,MyServiceMusic.class); intent.putExtra("action","stop"); startService(intent); tv_1.setText("播放状态11：停止播放。。。"); } public void pause_onclick(View view) { Intent intent = new Intent(this, MyServiceMusic.class); intent.putExtra("action","pause"); startService(intent); tv_1.setText("播放状态11：暂停播放。。。"); } public void exit_onclick(View view) { stop_onclick(view); finish(); } }
manifest.xml
<service android:name=".MyServiceMusic" android:enabled="true" android:exported="true" />
