public class MainActivity extends Activity implements OnPianoClickListener,OnLoadAudioListener ,SeekBar.OnSeekBarChangeListener{
    private PianoView pianoView;
    private SeekBar seekBar;
    @Override
    protected void onCreate(Bundle savedInstanceState){
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        pianoView = (PianoView) findViewById(R.id.pv);
        seekBar = (SeekBar) findViewById(R.id.sb);
        pianoView.setOnPianoClickListener(this);
        pianoView.setOnLoadMusicListener(this);
        seekBar.setOnSeekBarChangeListener(this);
        Log.e("TAG","onCreate");
    }

    @Override
    public void onPianoClick(Piano.PianoKeyType type, Piano.PianoVoice voice, int group, int positionOfGroup) {
        Log.e("TAG","Type:"+type +"---Voice:"+voice);
        Log.e("TAG","Group:"+group + "---" + "Position:"+positionOfGroup);
    }

    @Override
    public void loadPianoAudioStart() {
        Toast.makeText(getApplicationContext(),"loadPianoMusicStart",Toast.LENGTH_SHORT).show();
    }

    @Override
    public void loadPianoAudioFinish() {
        Toast.makeText(getApplicationContext(),"loadPianoMusicFinish",Toast.LENGTH_SHORT).show();
    }

    @Override
    public void loadPianoAudioError(Exception e) {
        Toast.makeText(getApplicationContext(),"loadPianoMusicError",Toast.LENGTH_SHORT).show();
    }

    @Override
    public void loadPianoAudioProgress(int progress) {
        Log.e("TAG","progress:"+progress);
    }

    @Override
    public void onProgressChanged(SeekBar seekBar, int i, boolean b) {
        pianoView.scroll(i);
    }

    @Override
    public void onStartTrackingTouch(SeekBar seekBar) {

    }

    @Override
    public void onStopTrackingTouch(SeekBar seekBar) {

    }


    @Override
    protected void onResume() {
        super.onResume();
        /**
         * 设置为横屏
         */
        if(getRequestedOrientation()!= ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE){
            setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE);
        }
        super.onResume();
    }
}

/**
 * 钢琴点击接口
 */
public interface OnPianoClickListener {
    /**
     * 点击钢琴键
     * @param type 钢琴键类型（黑、白）
     * @param voice 钢琴音色（DO,RE,MI,FA,SO,LA,SI）
     * @param group 钢琴键所在组（白：9组；黑：7组）
     * @param positionOfGroup 钢琴在组内位置
     */
    void onPianoClick(Piano.PianoKeyType type, Piano.PianoVoice voice,int group,int positionOfGroup);
}

/**
 * 加载音频接口
 */
public interface OnLoadAudioListener {
    /**
     * 开始
     */
    void loadPianoAudioStart();

    /**
     * 完成
     */
    void loadPianoAudioFinish();

    /**
     * 错误
     * @param e 异常
     */
    void loadPianoAudioError(Exception e);

    /**
     * 进度
     * @param progress 进度值
     */
    void loadPianoAudioProgress(int progress);
}