How to play or resume music of another music player from my code

Here is what I have discovered after testing these.

I have tried and verified these commands to work just fine.

// pause
Intent i = new Intent("com.android.music.musicservicecommand");
i.putExtra("command", "pause");
sendBroadcast(i);

// play
Intent i = new Intent("com.android.music.musicservicecommand");
i.putExtra("command", "play");
sendBroadcast(i);

// next
Intent i = new Intent("com.android.music.musicservicecommand");
i.putExtra("command", "next");
sendBroadcast(i);

// previous
Intent i = new Intent("com.android.music.musicservicecommand");
i.putExtra("command", "previous");
sendBroadcast(i);

Some more info about available commands:

public static final String SERVICECMD = "com.android.music.musicservicecommand";
public static final String CMDNAME = "command";
public static final String CMDTOGGLEPAUSE = "togglepause";
public static final String CMDSTOP = "stop";
public static final String CMDPAUSE = "pause";
public static final String CMDPLAY = "play";
public static final String CMDPREVIOUS = "previous";
public static final String CMDNEXT = "next";

taken from: https://android.googlesource.com/platform/packages/apps/Music/+/master/src/com/android/music/MediaPlaybackService.java

Try to use

Intent i = new Intent("com.android.music.musicservicecommand");
i.putExtra("command", "togglepause");
sendBroadcast(i);

Update

Try with the following action :

Intent i = new Intent("com.android.music.musicservicecommand.togglepause");
i.putExtra("command", "togglepause");
sendBroadcast(i);