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/*
* Copyright (C) 2014 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 android.tv;
import android.content.ComponentName;
import android.content.Context;
import android.graphics.Rect;
import android.os.Handler;
import android.tv.TvInputManager;
import android.tv.TvInputManager.Session;
import android.tv.TvInputManager.SessionCreateCallback;
import android.util.AttributeSet;
import android.util.Log;
import android.view.Surface;
import android.view.SurfaceHolder;
import android.view.SurfaceView;
import android.view.ViewTreeObserver;
/**
* View playing TV
*/
public class TvView extends SurfaceView {
private static final String TAG = "TvView";
private final Handler mHandler = new Handler();
private TvInputManager.Session mSession;
private Surface mSurface;
private boolean mOverlayViewCreated;
private Rect mOverlayViewFrame;
private boolean mGlobalListenersAdded;
private TvInputManager mTvInputManager;
private SessionCreateCallback mSessionCreateCallback;
private SurfaceHolder.Callback mSurfaceHolderCallback = new SurfaceHolder.Callback() {
@Override
public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) {
Log.d(TAG, "surfaceChanged(holder=" + holder + ", format=" + format + ", width=" + width
+ ", height=" + height + ")");
if (holder.getSurface() == mSurface) {
return;
}
mSurface = holder.getSurface();
setSessionSurface(mSurface);
}
@Override
public void surfaceCreated(SurfaceHolder holder) {
mSurface = holder.getSurface();
setSessionSurface(mSurface);
}
@Override
public void surfaceDestroyed(SurfaceHolder holder) {
mSurface = null;
setSessionSurface(null);
}
};
public TvView(Context context) {
this(context, null, 0);
}
public TvView(Context context, AttributeSet attrs) {
this(context, attrs, 0);
}
public TvView(Context context, AttributeSet attrs, int defStyleAttr) {
super(context, attrs, defStyleAttr);
getHolder().addCallback(mSurfaceHolderCallback);
mTvInputManager = (TvInputManager) getContext().getSystemService(Context.TV_INPUT_SERVICE);
}
/**
* Binds a TV input to this view. {@link SessionCreateCallback#onSessionCreated} will be
* called to send the result of this binding with {@link TvInputManager.Session}.
* If a TV input is already bound, the input will be unbound from this view and its session
* will be released.
*
* @param name TV input name will be bound to this view.
* @param callback called when TV input is bound. The callback sends
* {@link TvInputManager.Session}
* @throws IllegalArgumentException if any of the arguments is {@code null}.
*/
public void bindTvInput(ComponentName name, SessionCreateCallback callback) {
if (name == null) {
throw new IllegalArgumentException("name cannot be null");
}
if (callback == null) {
throw new IllegalArgumentException("callback cannot be null");
}
if (mSession != null) {
release();
}
// When bindTvInput is called multiple times before the callback is called,
// only the callback of the last bindTvInput call will be actually called back.
// The previous callbacks will be ignored. For the logic, mSessionCreateCallback
// is newly assigned for every bindTvInput call and compared with
// MySessionCreateCallback.this.
mSessionCreateCallback = new MySessionCreateCallback(callback);
mTvInputManager.createSession(name, mSessionCreateCallback, mHandler);
}
/**
* Unbinds a TV input currently bound. Its corresponding {@link TvInputManager.Session}
* is released.
*/
public void unbindTvInput() {
if (mSession != null) {
release();
}
}
@Override
protected void onAttachedToWindow() {
super.onAttachedToWindow();
createSessionOverlayView();
}
@Override
protected void onDetachedFromWindow() {
removeSessionOverlayView();
super.onDetachedFromWindow();
}
/** @hide */
@Override
protected void updateWindow(boolean force, boolean redrawNeeded) {
super.updateWindow(force, redrawNeeded);
relayoutSessionOverlayView();
}
private void release() {
setSessionSurface(null);
removeSessionOverlayView();
mSession.release();
mSession = null;
}
private void setSessionSurface(Surface surface) {
if (mSession == null) {
return;
}
mSession.setSurface(surface);
}
private void createSessionOverlayView() {
if (mSession == null || !isAttachedToWindow()
|| mOverlayViewCreated) {
return;
}
mOverlayViewFrame = getViewFrameOnScreen();
mSession.createOverlayView(this, mOverlayViewFrame);
mOverlayViewCreated = true;
}
private void removeSessionOverlayView() {
if (mSession == null || !mOverlayViewCreated) {
return;
}
mSession.removeOverlayView();
mOverlayViewCreated = false;
mOverlayViewFrame = null;
}
private void relayoutSessionOverlayView() {
if (mSession == null || !isAttachedToWindow()
|| !mOverlayViewCreated) {
return;
}
Rect viewFrame = getViewFrameOnScreen();
if (viewFrame.equals(mOverlayViewFrame)) {
return;
}
mSession.relayoutOverlayView(viewFrame);
mOverlayViewFrame = viewFrame;
}
private Rect getViewFrameOnScreen() {
int[] location = new int[2];
getLocationOnScreen(location);
return new Rect(location[0], location[1],
location[0] + getWidth(), location[1] + getHeight());
}
private class MySessionCreateCallback implements SessionCreateCallback {
final SessionCreateCallback mExternalCallback;
MySessionCreateCallback(SessionCreateCallback externalCallback) {
mExternalCallback = externalCallback;
}
@Override
public void onSessionCreated(Session session) {
if (this != mSessionCreateCallback) {
// This callback is obsolete.
session.release();
return;
}
mSession = session;
if (session != null) {
// mSurface may not be ready yet as soon as starting an application.
// In the case, we don't send Session.setSurface(null) unnecessarily.
// setSessionSurface will be called in surfaceCreated.
if (mSurface != null) {
setSessionSurface(mSurface);
}
createSessionOverlayView();
}
if (mExternalCallback != null) {
mExternalCallback.onSessionCreated(session);
}
}
}
}
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