基于 Agora SDK 实现 Android 端的多人视频互动

int count = uids.size();if(count <= 2) {// 只有本地视频或聊天室内只有另外一个人this.setLayoutManager(newLinearLayoutManager(activity.getApplicationContext(), orientation, false));} elseif(count > 2) {// 多人聊天室int itemSpanCount = getNearestSqrt(count);this.setLayoutManager(newGridLayoutManager(activity.getApplicationContext(), itemSpanCount, orientation, false));}

if(force || mItemWidth == 0|| mItemHeight == 0) {WindowManager windowManager = (WindowManager) mContext.getSystemService(Context.WINDOW_SERVICE);DisplayMetrics outMetrics = newDisplayMetrics();    windowManager.getDefaultDisplay().getMetrics(outMetrics);
int count = uids.size();intDividerX= 1;intDividerY= 1;
if(count == 2) {DividerY= 2;} elseif(count >= 3) {DividerX= getNearestSqrt(count);DividerY= (int) Math.ceil(count * 1.f/ DividerX);}
int width = outMetrics.widthPixels;int height = outMetrics.heightPixels;
if(width > height) {        mItemWidth = width / DividerY;        mItemHeight = height / DividerX;} else{        mItemWidth = width / DividerX;        mItemHeight = height / DividerY;}}

<RelativeLayoutxmlns:android="http://schemas.android.com/apk/res/android"android:id="@+id/user_control_mask"android:layout_width="match_parent"android:layout_height="match_parent"android:orientation="vertical">
<ImageViewandroid:id="@+id/default_avatar"android:layout_width="wrap_content"android:layout_height="wrap_content"android:layout_centerInParent="true"android:visibility="gone"android:src="@drawable/icon_default_avatar"android:contentDescription="DEFAULT_AVATAR"/>
<ImageViewandroid:id="@+id/indicator"android:layout_width="wrap_content"android:layout_height="wrap_content"android:layout_centerHorizontal="true"android:layout_alignParentBottom="true"android:layout_marginBottom="@dimen/video_indicator_bottom_margin"android:contentDescription="VIDEO_INDICATOR"/>
<LinearLayoutandroid:id="@+id/video_info_container"android:layout_width="wrap_content"android:layout_height="wrap_content"android:layout_alignParentTop="true"android:layout_marginTop="24dp"android:layout_marginStart="15dp"android:layout_marginLeft="15dp"android:visibility="gone"android:orientation="vertical">
<TextViewandroid:id="@+id/video_info_metadata"android:layout_width="wrap_content"android:layout_height="wrap_content"android:singleLine="true"style="@style/NotificationUIText"/></LinearLayout>
</RelativeLayout>

privatefinalHashMap<Integer, SurfaceView> mUidsList = newHashMap<>();

@Overridepublicvoid onFirstRemoteVideoDecoded(int uid, int width, int height, int elapsed) {   doRenderRemoteUi(uid);}
privatevoid doRenderRemoteUi(finalint uid) {   runOnUiThread(newRunnable() {@Overridepublicvoid run() {if(isFinishing()) {return;}
if(mUidsList.containsKey(uid)) {return;}
SurfaceView surfaceV = RtcEngine.CreateRendererView(getApplicationContext());           mUidsList.put(uid, surfaceV);
boolean useDefaultLayout = mLayoutType == LAYOUT_TYPE_DEFAULT;
           surfaceV.setZOrderOnTop(true);           surfaceV.setZOrderMediaOverlay(true);
           rtcEngine().setupRemoteVideo(newVideoCanvas(surfaceV, VideoCanvas.RENDER_MODE_HIDDEN, uid));
if(useDefaultLayout) {               log.debug("doRenderRemoteUi LAYOUT_TYPE_DEFAULT "+ (uid & 0xFFFFFFFFL));               switchToDefaultVideoView();} else{int bigBgUid = mSmallVideoViewAdapter == null? uid : mSmallVideoViewAdapter.getExceptedUid();               log.debug("doRenderRemoteUi LAYOUT_TYPE_SMALL "+ (uid & 0xFFFFFFFFL) + " "+ (bigBgUid & 0xFFFFFFFFL));               switchToSmallVideoView(bigBgUid);}}});}

SurfaceView target = user.mView;VideoViewAdapterUtil.stripView(target);holderView.addView(target, 0, newFrameLayout.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.MATCH_PARENT));

publicinterfaceVideoViewEventListener{void onItemDoubleClick(View v, Object item);}

mGridVideoViewContainer.setItemEventHandler(newVideoViewEventListener() {@Overridepublicvoid onItemDoubleClick(View v, Object item) {        log.debug("onItemDoubleClick "+ v + " "+ item + " "+ mLayoutType);
if(mUidsList.size() < 2) {return;}
UserStatusData user = (UserStatusData) item;int uid = (user.mUid == 0) ? config().mUid : user.mUid;
if(mLayoutType == LAYOUT_TYPE_DEFAULT && mUidsList.size() != 1) {            switchToSmallVideoView(uid);} else{            switchToDefaultVideoView();}}});

privatevoid switchToSmallVideoView(int bigBgUid) {HashMap<Integer, SurfaceView> slice = newHashMap<>(1);    slice.put(bigBgUid, mUidsList.get(bigBgUid));Iterator<SurfaceView> iterator = mUidsList.values().iterator();while(iterator.hasNext()) {SurfaceView s = iterator.next();        s.setZOrderOnTop(true);        s.setZOrderMediaOverlay(true);}
    mUidsList.get(bigBgUid).setZOrderOnTop(false);    mUidsList.get(bigBgUid).setZOrderMediaOverlay(false);
    mGridVideoViewContainer.initViewContainer(this, bigBgUid, slice, mIsLandscape);
    bindToSmallVideoView(bigBgUid);
    mLayoutType = LAYOUT_TYPE_SMALL;
    requestRemoteStreamType(mUidsList.size());}