郑州app开发android音乐播放器实例。布局代码是一个imagebutton和seekbar。

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下面是java代码

MainActivity.java

package cn.xhhkj.musiccyd;

import androidx.appcompat.app.AppCompatActivity;

import android.content.ComponentName;

import android.content.Intent;

import android.content.ServiceConnection;

import android.media.Mediaplayer;

import android.os.bundle;

import android.os.Handler;

import android.os.Ibinder;

import android.view.View;

import android.widget.Imagebutton;

import android.widget.Seekbar;

import java.io.IOException;

public class MainActivity extends AppCompatActivity {

    private static final String TAG = "结果是";

    private static final int UpDATE_pROGRESS = 0;

    public String path = "mnt/sdcard/Music/pingguo.mp3";

    private Imagebutton ib_play;

    private Seekbar sb_progress;

    private MusicplayerService.Mybinder musicController;

    private MyConnection conn;

    private Handler handler = new Handler(){

        public void handleMessage(android.os.Message msg) {

            switch (msg.what) {

                case UpDATE_pROGRESS:

                    updateprogress();

                    break;

            }

        };

    };

    @Override

    protected void onCreate(bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_main);

        ib_play = findViewbyId(R.id.musicbutton);

        sb_progress = findViewbyId(R.id.seekbar);

        sb_progress.setOnSeekbarChangeListener(new Seekbar.OnSeekbarChangeListener() {

            @Override

            public void onprogressChanged(Seekbar seekbar, int progress, boolean fromUser) {

                if(fromUser){

                    musicController.seekTo(progress);

                }

            }

            @Override

            public void onStartTrackingTouch(Seekbar seekbar) {

            }

            @Override

            public void onStopTrackingTouch(Seekbar seekbar) {

            }

        });

        Intent service = new Intent(this,MusicplayerService.class);

        startService(service);

        conn = new MyConnection();

        bindService(service, conn, bIND_AUTO_CREATE);

    }

    public void play(View view) {

//        Mediaplayer player = new Mediaplayer();

//        try {

//            player.setDataSource(path);

//            player.prepare();

//            player.start();

//        } catch (Exception e) {

//            // TODO Auto-generated catch block

//            e.printStackTrace();

//        }

        musicController.playpause();

        updateplayIcon();

    }

    class MyConnection implements ServiceConnection{

        @Override

        public void onServiceConnected(ComponentName name, Ibinder service) {

            musicController = (MusicplayerService.Mybinder)  service;

            updateplayIcon();

            sb_progress.setMax(musicController.getDuration());

            sb_progress.setprogress(musicController.getCurrentposition());

        }

        @Override

        public void onServiceDisconnected(ComponentName name) {

        }

    }

    private void updateplayIcon(){

        if(musicController.isplaying()){

            ib_play.setImageResource(R.drawable.pause);

            handler.sendEmptyMessage(UpDATE_pROGRESS);

        }else{

            ib_play.setImageResource(R.drawable.play);

            handler.removeMessages(UpDATE_pROGRESS);

        }

    }

    @Override

    protected void onStop() {

        super.onStop();

        handler.removeCallbacksAndMessages(null);

    }

    @Override

    protected void onDestroy() {

        super.onDestroy();

        unbindService(conn);

    }

    @Override

    protected void onResume() {

        super.onResume();

        if(musicController!=null){

            handler.sendEmptyMessage(UpDATE_pROGRESS);

        }

    }

    private void updateprogress(){

        int currentposition = musicController.getCurrentposition();

        sb_progress.setprogress(currentposition);

        handler.sendEmptyMessageDelayed(UpDATE_pROGRESS, 500);

    }

 

}

MusicplayerService.java

package cn.xhhkj.musiccyd;

import android.app.Service;

import android.content.Intent;

import android.media.Mediaplayer;

import android.os.binder;

import android.os.Ibinder;

import androidx.annotation.Nullable;

public class MusicplayerService extends Service {

    private Mediaplayer player;

    private String path = "mnt/sdcard/Music/pingguo.mp3";

    @Nullable

    @Override

    public Ibinder onbind(Intent intent) {

        return new Mybinder();

    }

    public class Mybinder extends binder {

        public void playpause(){

            if(player.isplaying()){

                player.pause();

            }else{

                player.start();

            }

        }

        public boolean isplaying(){

            return player.isplaying();

        }

        public int getDuration(){

            return player.getDuration();

        }

        public int getCurrentposition(){

            return player.getCurrentposition();

        }

        public void seekTo(int msec){

            player.seekTo(msec);

        }

    }

    @Override

    public void onCreate() {

        super.onCreate();

        player = new Mediaplayer();

        try {

            player.setDataSource(path);

            player.prepare();

        } catch (Exception e) {

            // TODO Auto-generated catch block

            e.printStackTrace();

        }

    }

}

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