add cast button to important activities

app/src/main/java/de/danoeh/antennapod/activity/CastEnabledActivity.java

@@ -0,0 +1,97 @@
+package de.danoeh.antennapod.activity;
+
+import android.content.SharedPreferences;
+import android.os.Bundle;
+import android.preference.PreferenceManager;
+import android.support.v7.app.AppCompatActivity;
+import android.view.Menu;
+import android.view.MenuItem;
+
+import com.google.android.libraries.cast.companionlibrary.cast.VideoCastManager;
+
+import de.danoeh.antennapod.R;
+import de.danoeh.antennapod.core.preferences.UserPreferences;
+
+/**
+ * Activity that allows for showing the MediaRouter button whenever there's a cast device in the
+ * network.
+ */
+public abstract class CastEnabledActivity extends AppCompatActivity
+        implements SharedPreferences.OnSharedPreferenceChangeListener {
+
+    protected VideoCastManager mCastManager;
+    private int castUICounter;
+    protected MenuItem mMediaRouteMenuItem;
+    protected boolean isCastEnabled;
+
+    @Override
+    protected void onCreate(Bundle savedInstanceState) {
+        super.onCreate(savedInstanceState);
+
+        PreferenceManager.getDefaultSharedPreferences(this).
+                registerOnSharedPreferenceChangeListener(this);
+
+        castUICounter = 0;
+        mCastManager = VideoCastManager.getInstance();
+        isCastEnabled = UserPreferences.isCastEnabled();
+    }
+
+    @Override
+    public boolean onCreateOptionsMenu(Menu menu) {
+        super.onCreateOptionsMenu(menu);
+        getMenuInflater().inflate(R.menu.cast_enabled, menu);
+        return true;
+    }
+
+    @Override
+    public boolean onPrepareOptionsMenu(Menu menu) {
+        super.onPrepareOptionsMenu(menu);
+        mMediaRouteMenuItem = menu.findItem(R.id.media_route_menu_item);
+        mMediaRouteMenuItem.setEnabled(isCastEnabled);
+        mMediaRouteMenuItem = mCastManager.addMediaRouterButton(menu, R.id.media_route_menu_item);
+        return true;
+    }
+
+    @Override
+    protected void onResume() {
+        super.onResume();
+        castUICounter++;
+        if (isCastEnabled) {
+            mCastManager.incrementUiCounter();
+            castUICounter++;
+        }
+    }
+
+    @Override
+    protected void onPause() {
+        super.onPause();
+        castUICounter--;
+        if (isCastEnabled) {
+            mCastManager.decrementUiCounter();
+            castUICounter--;
+        }
+    }
+
+    //This whole method might just be useless because it's assumed that the cast button
+    //won't show where the user actually has the power to change the preference.
+    @Override
+    public void onSharedPreferenceChanged(SharedPreferences sharedPreferences, String key) {
+        if (key.equals(UserPreferences.PREF_CAST_ENABLED)) {
+            isCastEnabled = UserPreferences.isCastEnabled();
+            mMediaRouteMenuItem.setEnabled(isCastEnabled);
+            if (isCastEnabled) {
+                //Test if activity is resumed but without UI counter incremented
+                if (castUICounter==1) {
+                    mCastManager.incrementUiCounter();
+                    castUICounter++;
+                }
+            } else {
+                if (castUICounter > 1) {
+                    mCastManager.decrementUiCounter();
+                    castUICounter--;
+                }
+                //TODO disable any current casting (or possibly do it within the PlaybackService)
+            }
+        }
+    }
+}

app/src/main/java/de/danoeh/antennapod/activity/MainActivity.java

@@ -17,7 +17,6 @@ import android.support.v4.app.FragmentTransaction;
 import android.support.v4.widget.DrawerLayout;
 import android.support.v7.app.ActionBarDrawerToggle;
 import android.support.v7.app.AlertDialog;
-import android.support.v7.app.AppCompatActivity;
 import android.support.v7.widget.Toolbar;
 import android.util.Log;
 import android.util.TypedValue;
@@ -70,7 +69,7 @@ import rx.schedulers.Schedulers;
 /**
  * The activity that is shown when the user launches the app.
  */
-public class MainActivity extends AppCompatActivity implements NavDrawerActivity {
+public class MainActivity extends CastEnabledActivity implements NavDrawerActivity {
 
     private static final String TAG = "MainActivity";
 

app/src/main/java/de/danoeh/antennapod/activity/MediaplayerActivity.java

@@ -12,7 +12,6 @@ import android.os.Build;
 import android.os.Bundle;
 import android.support.v4.view.ViewCompat;
 import android.support.v7.app.AlertDialog;
-import android.support.v7.app.AppCompatActivity;
 import android.util.Log;
 import android.view.Menu;
 import android.view.MenuInflater;
@@ -58,7 +57,7 @@ import rx.schedulers.Schedulers;
  * Provides general features which are both needed for playing audio and video
  * files.
  */
-public abstract class MediaplayerActivity extends AppCompatActivity implements OnSeekBarChangeListener {
+public abstract class MediaplayerActivity extends CastEnabledActivity implements OnSeekBarChangeListener {
     private static final String TAG = "MediaplayerActivity";
     private static final String PREFS = "MediaPlayerActivityPreferences";
     private static final String PREF_SHOW_TIME_LEFT = "showTimeLeft";

app/src/main/res/menu/cast_enabled.xml

@@ -0,0 +1,11 @@
+<?xml version="1.0" encoding="utf-8"?>
+<menu xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:custom="http://schemas.android.com/apk/res-auto">
+
+    <item
+        android:id="@+id/media_route_menu_item"
+        android:title="@string/media_route_menu_title"
+        android:enabled="false"
+        custom:actionProviderClass="android.support.v7.app.MediaRouteActionProvider"
+        custom:showAsAction="always"/>
+</menu>

core/src/main/res/values/strings.xml

@@ -616,4 +616,7 @@
     <string name="proxy_host_invalid_error">Host is not a valid IP address or domain</string>
     <string name="proxy_port_invalid_error">Port not valid</string>
 
+    <!-- Casting -->
+    <string name="media_route_menu_title">Play on&#8230;</string>
+
 </resources>