037-PlayerStautsBinding.md

#037: 播放状态的绑定

#首页

在播放器和专辑列表窗口都有播放状态，这2个窗口的播放状态要保持一致，在一个窗口改变播放状态要实时反应到另外另一个窗口中。

##1. 专辑列表窗口注册到PlayerPresenter并实现回调方法改变播放状态

AlbumDetailActivity.java:

protected void onCreate(Bundle savedInstanceState) {
	...
	playerPresenter = PlayerPresenter.getsInstance();
   	playerPresenter.registerCallback(this);
}

@Override
public void onPlayStart() {

    if (playStatusImageView != null && playStatusTextView != null) {
        playStatusImageView.setImageResource(R.drawable.selector_playstatus_pause);
        playStatusTextView.setText(R.string.album_player_playing);
    }
}

@Override
public void onPlayPause() {
    if (playStatusImageView != null && playStatusTextView != null) {
        playStatusImageView.setImageResource(R.drawable.selector_playstatus_playing);
        playStatusTextView.setText(R.string.album_player_pause);
    }
}

@Override
public void onPlayStop() {
    if (playStatusImageView != null && playStatusTextView != null) {
        playStatusImageView.setImageResource(R.drawable.selector_playstatus_playing);
        playStatusTextView.setText(R.string.album_player_pause);
    }
}

##2. 点击播放列表中播放状态改变播放器播放状态

AlbumDetailActivity.java:

private void initEvent() {

    playStatusImageView.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View view) {
            updatePlayStatus();
        }
    });

    playStatusTextView.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View view) {
            updatePlayStatus();
        }
    });
}


private void updatePlayStatus(){
    if (playerPresenter != null) {
        if (playerPresenter.isPlaying()) {
            playerPresenter.pause();
        }
        else{
            playerPresenter.play();
        }
    }
}

##3. 专辑页面首次点击播放按钮不播放问题解决 在首次进入专辑页面并点击播放按钮时并不会触发播放功能，主要原因是没有把播放列表设置到喜马拉雅SDK

AlbumDetailActivity.java:

private void initEvent() {

    playStatusImageView.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View view) {
            checkAndUpdatePlayStatus();
        }
    });

    playStatusTextView.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View view) {
            checkAndUpdatePlayStatus();
        }
    });
}

private void checkAndUpdatePlayStatus(){
    if (playerPresenter != null) {
        if(playerPresenter.hasSetPlayList()) {
            updatePlayStatus();
        }
        else{
            setPlayList();
        }
    }
}

private void setPlayList() {
    if(playerPresenter != null){
        playerPresenter.setPlayList(tracks, 0);
    }
}

private void updatePlayStatus() {
    if (playerPresenter.isPlaying()) {
        playerPresenter.pause();
    }
    else{
        playerPresenter.play();
    }
}

##4. 效果图