Added progress bar to the mini player.

app/src/main/java/com/kabouzeid/gramophone/helper/MusicProgressViewUpdateHelper.java

@@ -0,0 +1,65 @@
+package com.kabouzeid.gramophone.helper;
+
+import android.os.Handler;
+import android.os.Message;
+import android.support.annotation.NonNull;
+
+/**
+ * @author Karim Abou Zeid (kabouzeid)
+ */
+public class MusicProgressViewUpdateHelper extends Handler {
+    private static final int CMD_REFRESH_PROGRESS_VIEWS = 1;
+
+    private Callback callback;
+
+    public void start() {
+        queueNextRefresh(1);
+    }
+
+    public void stop() {
+        removeMessages(CMD_REFRESH_PROGRESS_VIEWS);
+    }
+
+    public MusicProgressViewUpdateHelper(Callback callback) {
+        this.callback = callback;
+    }
+
+    @Override
+    public void handleMessage(@NonNull Message msg) {
+        super.handleMessage(msg);
+        if (msg.what == CMD_REFRESH_PROGRESS_VIEWS) {
+            queueNextRefresh(refreshProgressViews());
+        }
+    }
+
+    private long refreshProgressViews() {
+        final int progressMillis = MusicPlayerRemote.getSongProgressMillis();
+        final int totalMillis = MusicPlayerRemote.getSongDurationMillis();
+
+        callback.onUpdateProgressViews(progressMillis, totalMillis);
+
+        if (!MusicPlayerRemote.isPlaying()) {
+            return 500;
+        }
+
+        // calculate the number of milliseconds until the next full second,
+        // so
+        // the counter can be updated at just the right time
+        final long remainingMillis = 1000 - progressMillis % 1000;
+        if (remainingMillis < 20) {
+            return 20;
+        }
+
+        return remainingMillis;
+    }
+
+    private void queueNextRefresh(final long delay) {
+        final Message message = obtainMessage(CMD_REFRESH_PROGRESS_VIEWS);
+        removeMessages(CMD_REFRESH_PROGRESS_VIEWS);
+        sendMessageDelayed(message, delay);
+    }
+
+    public interface Callback {
+        void onUpdateProgressViews(int progress, int total);
+    }
+}

app/src/main/java/com/kabouzeid/gramophone/helper/PlayPauseButtonOnClickHandler.java

@@ -0,0 +1,17 @@
+package com.kabouzeid.gramophone.helper;
+
+import android.view.View;
+
+/**
+ * @author Karim Abou Zeid (kabouzeid)
+ */
+public class PlayPauseButtonOnClickHandler implements View.OnClickListener {
+    @Override
+    public void onClick(View v) {
+        if (MusicPlayerRemote.isPlaying()) {
+            MusicPlayerRemote.pauseSong();
+        } else {
+            MusicPlayerRemote.resumePlaying();
+        }
+    }
+}