apis/app/PresentationWithMediaRouterActivity.java

/*
 * Copyright (C) 2012 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.example.android.apis.app;

import com.example.android.apis.R;
import com.example.android.apis.graphics.CubeRenderer;

import android.app.Activity;
import android.app.MediaRouteActionProvider;
import android.app.Presentation;
import android.content.Context;
import android.content.DialogInterface;
import android.content.res.Resources;
import android.media.MediaRouter;
import android.media.MediaRouter.RouteInfo;
import android.opengl.GLSurfaceView;
import android.os.Bundle;
import android.util.Log;
import android.view.Display;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.WindowManager;
import android.widget.TextView;

//BEGIN_INCLUDE(activity)
/**
 * <h3>Presentation Activity</h3>
 *
 * <p>
 * This demonstrates how to create an activity that shows some content
 * on a secondary display using a {@link Presentation}.
 * </p><p>
 * The activity uses the {@link MediaRouter} API to automatically detect when
 * a presentation display is available and to allow the user to control the
 * media routes using a menu item.  When a presentation display is available,
 * we stop showing content in the main activity and instead open up a
 * {@link Presentation} on the preferred presentation display.  When a presentation
 * display is removed, we revert to showing content in the main activity.
 * We also write information about displays and display-related events to
 * the Android log which you can read using <code>adb logcat</code>.
 * </p><p>
 * You can try this out using an HDMI or Wifi display or by using the
 * "Simulate secondary displays" feature in Development Settings to create a few
 * simulated secondary displays.  Each display will appear in the list along with a
 * checkbox to show a presentation on that display.
 * </p><p>
 * See also the {@link PresentationActivity} sample which
 * uses the low-level display manager to enumerate displays and to show multiple
 * simultaneous presentations on different displays.
 * </p>
 */
public class PresentationWithMediaRouterActivity extends Activity {
    private final String TAG = "PresentationWithMediaRouterActivity";

    private MediaRouter mMediaRouter;
    private DemoPresentation mPresentation;
    private GLSurfaceView mSurfaceView;
    private TextView mInfoTextView;
    private boolean mPaused;

    /**
     * Initialization of the Activity after it is first created.  Must at least
     * call {@link android.app.Activity#setContentView setContentView()} to
     * describe what is to be displayed in the screen.
     */
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        // Be sure to call the super class.
        super.onCreate(savedInstanceState);

        // Get the media router service.
        mMediaRouter = (MediaRouter)getSystemService(Context.MEDIA_ROUTER_SERVICE);

        // See assets/res/any/layout/presentation_with_media_router_activity.xml for this
        // view layout definition, which is being set here as
        // the content of our screen.
        setContentView(R.layout.presentation_with_media_router_activity);

        // Set up the surface view for visual interest.
        mSurfaceView = (GLSurfaceView)findViewById(R.id.surface_view);
        mSurfaceView.setRenderer(new CubeRenderer(false));

        // Get a text view where we will show information about what's happening.
        mInfoTextView = (TextView)findViewById(R.id.info);
    }

    @Override
    protected void onResume() {
        // Be sure to call the super class.
        super.onResume();

        // Listen for changes to media routes.
        mMediaRouter.addCallback(MediaRouter.ROUTE_TYPE_LIVE_VIDEO, mMediaRouterCallback);

        // Update the presentation based on the currently selected route.
        mPaused = false;
        updatePresentation();
    }

    @Override
    protected void onPause() {
        // Be sure to call the super class.
        super.onPause();

        // Stop listening for changes to media routes.
        mMediaRouter.removeCallback(mMediaRouterCallback);

        // Pause rendering.
        mPaused = true;
        updateContents();
    }

    @Override
    protected void onStop() {
        // Be sure to call the super class.
        super.onStop();

        // Dismiss the presentation when the activity is not visible.
        if (mPresentation != null) {
            Log.i(TAG, "Dismissing presentation because the activity is no longer visible.");
            mPresentation.dismiss();
            mPresentation = null;
        }
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Be sure to call the super class.
        super.onCreateOptionsMenu(menu);

        // Inflate the menu and configure the media router action provider.
        getMenuInflater().inflate(R.menu.presentation_with_media_router_menu, menu);

        MenuItem mediaRouteMenuItem = menu.findItem(R.id.menu_media_route);
        MediaRouteActionProvider mediaRouteActionProvider =
                (MediaRouteActionProvider)mediaRouteMenuItem.getActionProvider();
        mediaRouteActionProvider.setRouteTypes(MediaRouter.ROUTE_TYPE_LIVE_VIDEO);

        // Return true to show the menu.
        return true;
    }

    private void updatePresentation() {
        // Get the current route and its presentation display.
        MediaRouter.RouteInfo route = mMediaRouter.getSelectedRoute(
                MediaRouter.ROUTE_TYPE_LIVE_VIDEO);
        Display presentationDisplay = route != null ? route.getPresentationDisplay() : null;

        // Dismiss the current presentation if the display has changed.
        if (mPresentation != null && mPresentation.getDisplay() != presentationDisplay) {
            Log.i(TAG, "Dismissing presentation because the current route no longer "
                    + "has a presentation display.");
            mPresentation.dismiss();
            mPresentation = null;
        }

        // Show a new presentation if needed.
        if (mPresentation == null && presentationDisplay != null) {
            Log.i(TAG, "Showing presentation on display: " + presentationDisplay);
            mPresentation = new DemoPresentation(this, presentationDisplay);
            mPresentation.setOnDismissListener(mOnDismissListener);
            try {
                mPresentation.show();
            } catch (WindowManager.InvalidDisplayException ex) {
                Log.w(TAG, "Couldn't show presentation!  Display was removed in "
                        + "the meantime.", ex);
                mPresentation = null;
            }
        }

        // Update the contents playing in this activity.
        updateContents();
    }

    private void updateContents() {
        // Show either the content in the main activity or the content in the presentation
        // along with some descriptive text about what is happening.
        if (mPresentation != null) {
            mInfoTextView.setText(getResources().getString(
                    R.string.presentation_with_media_router_now_playing_remotely,
                    mPresentation.getDisplay().getName()));
            mSurfaceView.setVisibility(View.INVISIBLE);
            mSurfaceView.onPause();
            if (mPaused) {
                mPresentation.getSurfaceView().onPause();
            } else {
                mPresentation.getSurfaceView().onResume();
            }
        } else {
            mInfoTextView.setText(getResources().getString(
                    R.string.presentation_with_media_router_now_playing_locally,
                    getWindowManager().getDefaultDisplay().getName()));
            mSurfaceView.setVisibility(View.VISIBLE);
            if (mPaused) {
                mSurfaceView.onPause();
            } else {
                mSurfaceView.onResume();
            }
        }
    }

    private final MediaRouter.SimpleCallback mMediaRouterCallback =
            new MediaRouter.SimpleCallback() {
        @Override
        public void onRouteSelected(MediaRouter router, int type, RouteInfo info) {
            Log.d(TAG, "onRouteSelected: type=" + type + ", info=" + info);
            updatePresentation();
        }

        @Override
        public void onRouteUnselected(MediaRouter router, int type, RouteInfo info) {
            Log.d(TAG, "onRouteUnselected: type=" + type + ", info=" + info);
            updatePresentation();
        }

        @Override
        public void onRoutePresentationDisplayChanged(MediaRouter router, RouteInfo info) {
            Log.d(TAG, "onRoutePresentationDisplayChanged: info=" + info);
            updatePresentation();
        }
    };

    /**
     * Listens for when presentations are dismissed.
     */
    private final DialogInterface.OnDismissListener mOnDismissListener =
            new DialogInterface.OnDismissListener() {
        @Override
        public void onDismiss(DialogInterface dialog) {
            if (dialog == mPresentation) {
                Log.i(TAG, "Presentation was dismissed.");
                mPresentation = null;
                updateContents();
            }
        }
    };

    /**
     * The presentation to show on the secondary display.
     * <p>
     * Note that this display may have different metrics from the display on which
     * the main activity is showing so we must be careful to use the presentation's
     * own {@link Context} whenever we load resources.
     * </p>
     */
    private final static class DemoPresentation extends Presentation {
        private GLSurfaceView mSurfaceView;

        public DemoPresentation(Context context, Display display) {
            super(context, display);
        }

        @Override
        protected void onCreate(Bundle savedInstanceState) {
            // Be sure to call the super class.
            super.onCreate(savedInstanceState);

            // Get the resources for the context of the presentation.
            // Notice that we are getting the resources from the context of the presentation.
            Resources r = getContext().getResources();

            // Inflate the layout.
            setContentView(R.layout.presentation_with_media_router_content);

            // Set up the surface view for visual interest.
            mSurfaceView = (GLSurfaceView)findViewById(R.id.surface_view);
            mSurfaceView.setRenderer(new CubeRenderer(false));
        }

        public GLSurfaceView getSurfaceView() {
            return mSurfaceView;
        }
    }
}
//END_INCLUDE(activity)