序言
最近的项目中涉及到视频播放，在这里我把关于视频播放技术中的一些心得体会记录下来。
功能
完整演示
安装地址
http://pre.im/lNm8
基本功能
1.在无wifi的情况下提示用户，包括正在播放的时候网络切换也会提示用户。
2.小窗播放：当用户正在观看的视频没有播完，用户又滑动到其他页面则视频继续在小窗播放，播放完成以后小窗自动消失，并提示用户播放完毕。
播放完毕提示
3.列表播放：支持在列表中播放
4.跨界面播放，在列表中播放时，点击列表进入详情页。或在小窗播放时点击小窗进入详情页。视频将继续播放，不会重头开始。
实现
关于视频在任意位置播放，我主要是通过一个VideoPlayManager来管理的。在VideoPlayManager中有一个用来播放视频的VideoPlayView，而在需要播放视频的时候通过Rxbus发送一个事件，事件包含了能够展示VideoPlayView的FragmeLayout和需要播放的视频资源。VideoPlayManager初始化的时候开启了一个线程用来检测当前视频需要播放的位置。
package com.zhuguohui.videodemo.video;
import android.app.Activity;
import android.app.Application;
import android.content.Context;
import android.content.Intent;
import android.graphics.PixelFormat;
import android.graphics.Rect;
import android.net.Uri;
import android.os.Build;
import android.os.Bundle;
import android.os.Handler;
import android.os.Looper;
import android.provider.Settings;
import android.view.Gravity;
import android.view.View;
import android.view.ViewGroup;
import android.view.WindowManager;
import android.view.WindowManager.LayoutParams;
import android.widget.FrameLayout;
import android.widget.ImageView;
import android.widget.RelativeLayout;
import com.trs.videolist.CustomMediaContoller;
import com.trs.videolist.VideoPlayView;
import com.zhuguohui.videodemo.R;
import com.zhuguohui.videodemo.activity.FullscreenActivity;
import com.zhuguohui.videodemo.adapter.VideoAdapter;
import com.zhuguohui.videodemo.bean.VideoItem;
import com.zhuguohui.videodemo.rx.RxBus;
import com.zhuguohui.videodemo.service.NetworkStateService;
import com.zhuguohui.videodemo.util.AppUtil;
import com.zhuguohui.videodemo.util.ToastUtil;
import tv.danmaku.ijk.media.player.IMediaPlayer;
import static android.view.MotionEvent.ACTION_DOWN;
import static android.view.MotionEvent.ACTION_MOVE;
import static android.view.MotionEvent.ACTION_UP;
import static android.view.ViewGroup.LayoutParams.MATCH_PARENT;
import static android.view.WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON;
import static android.view.WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE;
/**
* 用于管理视频播放的工具类
*
* 通过RxBus发送事件来播放和切换播放容器
* 在程序运行期间通过displayThread自动在小窗模式，列表模式切换。
*
* Created by zhuguohui on 2017/1/11 0011.
*/
public class VideoPlayManager {
private static WindowManager windowManager;
private static Context sContext;
private static boolean haveInit = false;
//小窗播放
private static FrameLayout smallPlayHolder;
private static RelativeLayout smallWindow;
private static LayoutParams smallWindowParams;
//小窗关闭的button
private static ImageView iv_close;
private static VideoPlayView sVideoPlayView;
//正在播放的Item
private static VideoItem sPlayingItem = null;
//正在暂时视频的容器
private static ViewGroup sPlayingHolder = null;
//当前的Activity
private static Activity currentActivity;
//标识是否在后台运行
private static boolean runOnBack = false;
//用于播放完成的监听器
private static CompletionListener completionListener = new CompletionListener();
//标识是否在小窗模式
private static boolean sPlayInSmallWindowMode = false;
//用于在主线程中更新UI
private static Handler handler = new Handler(Looper.getMainLooper());
//记录在小窗中按下的位置
private static float xDownInSmallWindow, yDownInSmallWindow;
//记录在小窗中上一次触摸的位置
private static float lastX, lastY = 0;
private static VideoAdapter.VideoClickListener videoClickListener = new VideoAdapter.VideoClickListener();
public static void init(Context context) {
if (haveInit) {
return;
}
sContext = context.getApplicationContext();
windowManager = (WindowManager) sContext.getSystemService(Context.WINDOW_SERVICE);
//初始化播放容器
initVideoPlayView();
//创建小窗播放容器
createSmallWindow();
//注册事件 处理
registerEvent();
Application application = (Application) sContext;
//监听应用前后台的切换
application.registerActivityLifecycleCallbacks(lifecycleCallbacks);
haveInit = true;
}
/**
* 初始化播放控件
*/
private static void initVideoPlayView() {
sVideoPlayView = new VideoPlayView(sContext);
sVideoPlayView.setCompletionListener(completionListener);
sVideoPlayView.setFullScreenChangeListener(fullScreenChangeListener);
sVideoPlayView.setOnErrorListener(onErrorListener);
}
private static IMediaPlayer.OnErrorListener onErrorListener = (mp, what, extra) -> {
ToastUtil.getInstance().showToast("播放失败");
completionListener.completion(null);
return true;
};
/**
* 用于显示视频的线程
* 在应用进入前台的时候启动，在切换到后台的时候停止
* 负责，判断当前的显示状态并显示到正确位置
*/
private static void createSmallWindow() {
smallWindow = (RelativeLayout) View.inflate(sContext, R.layout.view_small_holder, null);
smallPlayHolder = (FrameLayout) smallWindow.findViewById(R.id.small_holder);
//关闭button
iv_close = (ImageView) smallWindow.findViewById(R.id.iv_close);
iv_close.setOnClickListener(v ->
{
if (sVideoPlayView.isPlay()) {
sVideoPlayView.stop();
sVideoPlayView.release();
}
completionListener.completion(null);
});
smallWindowParams = new LayoutParams();
int width = AppUtil.dip2px(sContext, 160);
int height = AppUtil.dip2px(sContext, 90);
smallWindowParams.width = width;
smallWindowParams.height = height;
smallWindowParams.gravity = Gravity.TOP | Gravity.LEFT;
smallWindowParams.x = 0;
smallWindowParams.y = 0;
/* if (Build.VERSION.SDK_INT > Build.VERSION_CODES.KITKAT) {
smallWindowParams.type = LayoutParams.TYPE_TOAST;
} else {
smallWindowParams.type = LayoutParams.TYPE_PHONE;
}*/
smallWindowParams.type = LayoutParams.TYPE_SYSTEM_ERROR;
smallWindowParams.flags = FLAG_NOT_FOCUSABLE | FLAG_KEEP_SCREEN_ON;
// 设置期望的bitmap格式
smallWindowParams.format = PixelFormat.RGBA_8888;
//实现view可拖动
smallWindow.setOnTouchListener((v, event) -> {
switch (event.getAction()) {
case ACTION_DOWN:
xDownInSmallWindow = event.getRawX();
yDownInSmallWindow = event.getRawY();
lastX = xDownInSmallWindow;
lastY = yDownInSmallWindow;
break;
case ACTION_MOVE:
float moveX = event.getRawX() - lastX;
float moveY = event.getRawY() - lastY;
lastX = event.getRawX();
lastY = event.getRawY();
if (Math.abs(moveX) > 10 || Math.abs(moveY) > 10) {
//更新
smallWindowParams.x += moveX;
smallWindowParams.y += moveY;
windowManager.updateViewLayout(smallWindow, smallWindowParams);
return true;
}
break;
case ACTION_UP:
moveX = event.getRawX() - xDownInSmallWindow;
moveY = event.getRawY() - yDownInSmallWindow;
//实现点击事件
if (Math.abs(moveX) < 10 && Math.abs(moveY) < 10) {
videoClickListener.onVideoClick(currentActivity, sPlayingItem);
return true;
}
break;
}
return false;
});
}
/**
* 请求用户给予悬浮窗的权限
*/
public static boolean askForPermission() {
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
if (!Settings.canDrawOverlays(currentActivity)) {
// Toast.makeText(TestFloatWinActivity.this, "当前无权限，请授权！", Toast.LENGTH_SHORT).show();
Intent intent = new Intent(Settings.ACTION_MANAGE_OVERLAY_PERMISSION,
Uri.parse("package:" + currentActivity.getPackageName()));
// currentActivity.startActivityForResult(intent,OVERLAY_PERMISSION_REQ_CODE);
currentActivity.startActivity(intent);
return false;
} else {
return true;
}
}
return true;
}
/**
* 用于监控应用前后台的切换
*/
private static Application.ActivityLifecycleCallbacks lifecycleCallbacks = new Application.ActivityLifecycleCallbacks() {
private int count = 0;
private boolean videoPause = false;
@Override
public void onActivityCreated(Activity activity, Bundle savedInstanceState) {
}
@Override
public void onActivityStarted(Activity activity) {
if (count == 0) {
//切换到前台
runOnBack = false;
if (sPlayInSmallWindowMode) {
windowManager.addView(smallWindow, smallWindowParams);
}
//继续播放视频
if (videoPause) {
sVideoPlayView.pause();
videoPause = false;
}
DisPlayThread.startDisplay();
}
count++;
}
@Override
public void onActivityResumed(Activity activity) {
currentActivity = activity;
}
@Override
public void onActivityPaused(Activity activity) {
}
@Override
public void onActivityStopped(Activity activity) {
count--;
if (count == 0) {
//切换到后台
runOnBack = true;
//停止检测线程
DisPlayThread.stopDisplay();
//如果是小窗模式移除window
if (sPlayInSmallWindowMode) {
windowManager.removeView(smallWindow);
}
//视频暂停
if (sVideoPlayView.isPlay()) {
sVideoPlayView.pause();
videoPause = true;
}
}
}
@Override
public void onActivitySaveInstanceState(Activity activity, Bundle outState) {
}
@Override
public void onActivityDestroyed(Activity activity) {
}
};
/**
* 退出全屏
*/
private static void exitFromFullScreenMode() {
currentActivity.finish();
}
private static CustomMediaContoller.FullScreenChangeListener fullScreenChangeListener = () -> {
if (!(currentActivity instanceof FullscreenActivity)) {
enterFullScreenMode();
} else {
exitFromFullScreenMode();
}
};
private static void enterFullScreenMode() {
currentActivity.startActivity(new Intent(currentActivity, FullscreenActivity.class));
}
private static class CompletionListener implements VideoPlayView.CompletionListener {
@Override
public void completion(IMediaPlayer mp) {
if (currentActivity instanceof FullscreenActivity) {
currentActivity.finish();
}
//如果是小窗播放则退出小窗
if (sPlayInSmallWindowMode) {
if (mp != null) {
//mp不等于null表示正常的播放完成退出
//在小窗消失之前给用户一个提示消息，防止太突兀
ToastUtil.getInstance().ok().showToast("播放完毕");
}
exitFromSmallWindowMode();
}
//将播放控件从器父View中移出
removeVideoPlayViewFromParent();
sPlayingItem = null;
if (sPlayingHolder != null) {
sPlayingHolder.setKeepScreenOn(false);
}
sPlayingHolder = null;
//释放资源
sVideoPlayView.release();
}
}
/**
* 注册事件处理
*/
private static void registerEvent() {
//处理在View中播放
RxBus.getDefault().toObserverable(PlayInViewEvent.class).subscribe(playInViewEvent -> {
//表示播放容器，和视频内容是否变化
boolean layoutChange = sPlayingHolder == null || !sPlayingHolder.equals(playInViewEvent.getPlayLayout());
boolean videoChange = sPlayingItem == null || !sPlayingItem.equals(playInViewEvent.getNewsItem());
//重置状态，保存播放的Holder
if (videoChange) {
sPlayingItem = playInViewEvent.getNewsItem();
}
if (layoutChange) {
removeVideoPlayViewFromParent();
if (sPlayingHolder != null) {
//关闭之前View的屏幕常亮
sPlayingHolder.setKeepScreenOn(false);
}
sPlayingHolder = playInViewEvent.getPlayLayout();
//将播放的Item设置为播放view的tag，就可以通过displayThread检查当前Activity中是否
//包含了这个tag的View存在，而直到是否有播放容器存在，如果没有的话就使用小窗播放。
sPlayingHolder.setTag(sPlayingItem);
//显示控制条
sVideoPlayView.setShowContoller(true);
//开启屏幕常亮
sVideoPlayView.setKeepScreenOn(true);
sPlayingHolder.addView(sVideoPlayView, new FrameLayout.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.MATCH_PARENT));
}
if (videoChange) {
//播放新视频
if (sVideoPlayView.isPlay()) {
sVideoPlayView.stop();
sVideoPlayView.release();
}
sPlayingHolder.setTag(sPlayingItem);
//判断网络,如果在移动网络则提示用户
ViedoPlayChecker.checkPlayNet(currentActivity, () -> {
sVideoPlayView.start(sPlayingItem.getVideoUrl());
}, () -> {
completionListener.completion(null);
});
} else {
//重播
if (!sVideoPlayView.isPlay()) {
sVideoPlayView.start(sPlayingItem.getVideoUrl());
}
}
});
//处理视频回退
RxBus.getDefault().toObserverable(PlayVideoBackEvent.class).subscribe(playVideoBackEvent -> {
sPlayingHolder = null;
});
//处理网络变化
RxBus.getDefault().toObserverable(NetworkStateService.NetStateChangeEvent.class).subscribe(netStateChangeEvent -> {
if (netStateChangeEvent.getState() == NetworkStateService.NetStateChangeEvent.NetState.NET_4G && sVideoPlayView.isPlay()) {
sVideoPlayView.pause();
//如果在移动网络播放，则提示用户
ViedoPlayChecker.checkPlayNet(currentActivity, () -> {
sVideoPlayView.pause();
}, () -> {
completionListener.completion(null);
});
}
});
//处理取消播放事件
RxBus.getDefault().toObserverable(PlayCancleEvent.class).subscribe(playCancleEvent -> {
completionListener.completion(null);
});
}
/**
* 进入小窗播放模式
*/
private static void enterSmallWindowMode() {
//检查权限
if (!askForPermission()) {
ToastUtil.getInstance().showToast("小窗播放需要浮窗权限");
return;
}
if (!sPlayInSmallWindowMode) {
handler.post(() -> {
removeVideoPlayViewFromParent();
//隐藏控制条
sVideoPlayView.setShowContoller(false);
smallPlayHolder.addView(sVideoPlayView, new FrameLayout.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.MATCH_PARENT));
try {
windowManager.addView(smallWindow, smallWindowParams);
} catch (Exception e) {
e.printStackTrace();
//已经添加了，则更新
windowManager.updateViewLayout(smallWindow, smallWindowParams);
}
sPlayingHolder = smallPlayHolder;
sPlayInSmallWindowMode = true;
});
}
}
/**
* 退出小窗播放模式
*/
private static void exitFromSmallWindowMode() {
if (sPlayInSmallWindowMode) {
handler.post(() -> {
windowManager.removeView(smallWindow);
sPlayInSmallWindowMode = false;
//显示控制条
sVideoPlayView.setShowContoller(true);
});
}
}
private static void removeVideoPlayViewFromParent() {
if (sVideoPlayView != null) {
if (sVideoPlayView.getParent() != null) {
ViewGroup parent = (ViewGroup) sVideoPlayView.getParent();
parent.removeView(sVideoPlayView);
}
}
}
public static class DisPlayThread extends Thread {
private boolean check = false;
private static DisPlayThread disPlayThread;
public synchronized static void startDisplay() {
if (disPlayThread != null) {
stopDisplay();
}
disPlayThread = new DisPlayThread();
disPlayThread.start();
}
public synchronized static void stopDisplay() {
if (disPlayThread != null) {
disPlayThread.cancel();
disPlayThread = null;
}
}
private void cancel() {
check = false;
}
private DisPlayThread() {
}
@Override
public void run() {
while (check) {
try {
Thread.sleep(500);
} catch (InterruptedException e) {
e.printStackTrace();
}
//如果在后台运行，直接退出
if (runOnBack) {
check = false;
stopDisplay();
return;
}
//检查是否有正在播放的Item，如果没有则不显示任何播放界面
if (sPlayingItem == null) {
continue;
}
//检查是否有可播放的容器，通过Tag查找,不能通过id查找
//因为在ListView或者RecycleView中View是会复用的，因此需要在ListView，或RecycleView中每次
//创建holder的时候把tag设置到需要展示Video的FrameLayout上。
//使用正在播放的item作为tag;
if (currentActivity != null) {
View contentView = currentActivity.findViewById(android.R.id.content);
View playView = contentView.findViewWithTag(sPlayingItem);
//判断正在播放的view是否是显示在界面的,在ListView或RecycleView中会有移除屏幕的情况发生
if (isShowInWindow(playView)) {
//如果显示,判断是否和之前显示的是否是同一个View
//如果不是则切换到当前view中
exitFromSmallWindowMode();
if (sPlayingHolder != playView) {
handler.post(() -> {
//关闭屏幕常亮
if (sPlayingHolder != null) {
sPlayingHolder.setKeepScreenOn(false);
}
removeVideoPlayViewFromParent();
ViewGroup viewGroup = (ViewGroup) playView;
viewGroup.addView(sVideoPlayView, new FrameLayout.LayoutParams(MATCH_PARENT, MATCH_PARENT));
sPlayingHolder = viewGroup;
//保持屏幕常亮
sPlayingHolder.setKeepScreenOn(true);
});
}
} else {
//如果不显示，则在小窗中播放
enterSmallWindowMode();
}
}
}
}
Rect r = new Rect();
private boolean isShowInWindow(View view) {
if (view == null) {
return false;
}
boolean localVisibleRect = view.getLocalVisibleRect(r);
boolean show = localVisibleRect && view.isShown();
return show;
}
@Override
public synchronized void start() {
check = true;
super.start();
}
}
public static VideoItem getPlayingItem() {
return sPlayingItem;
}
/**
* 取消播放事件，比如应用程序退出时发出这个时间
*/
public static class PlayCancleEvent {
}
/**
* 视频播放退出
*/
public static class PlayVideoBackEvent {
}
/**
* 将视频显示在指定的View中
* 如果视频发生改变则播放视频
* 如果view发生改变但是视频没有改变，则只是切换播放的view。
*/
public static class PlayInViewEvent {
FrameLayout playLayout;
VideoItem newsItem;
boolean playInList;
public PlayInViewEvent(FrameLayout playLayout, VideoItem newsItem) {
this(playLayout, newsItem, false);
}
public PlayInViewEvent(FrameLayout playLayout, VideoItem newsItem, boolean playInList) {
this.playLayout = playLayout;
this.newsItem = newsItem;
this.playInList = playInList;
}
public VideoItem getNewsItem() {
return newsItem;
}
public void setNewsItem(VideoItem newsItem) {
this.newsItem = newsItem;
}
public FrameLayout getPlayLayout() {
return playLayout;
}
public void setPlayLayout(FrameLayout playLayout) {
this.playLayout = playLayout;
}
}
}
视频播放的时候只需要发送一个消息就行了。
RxBus.getDefault().post(new VideoPlayManager.PlayInViewEvent(holder.layout_holder, videoItem, true));
需要注意的时候，为了能在ListView和RecyclerView中播放，需要将播放的item绑定的播放容器上，这样在线程检测当前界面是否有能播放视频的容器时才不会因为RecyclerView的复用而出错。
holder.layout_holder.setTag(videoItem);
关于更多的细节大家看我的Demo吧，内容实在太多。
Demo
https://github.com/zhuguohui/VideoDemo