Android在Adapter中获取网络视频第一帧（优化）

偏执的太偏执、 2022-04-13 14:00 661阅读 0赞

获取成功以后使用的是map保存，key为adapter的position 避免销毁再次加载

@SuppressLint("UseSparseArrays")
        private Map<Integer, Bitmap> bitmapMap = new HashMap<>();//bitmap的集合
        @SuppressLint("HandlerLeak")
        private final Handler handler = new Handler() {
            @Override
            public void handleMessage(Message msg) {
                switch (msg.what) {
                    case 1:
                        myHolder.image_video.setImageBitmap((Bitmap) msg.obj);
                        break;
                }
                super.handleMessage(msg);
            }
        };

下面就是获取的方法

private void loadVideo(@NonNull MyHolder holder,String video) {
            Log.e("loadVideo", video);
            if (video.contains(".mp4") || video.contains(".avi") || video.contains(".rmvb") || video.contains(".3gp")) {
                if (bitmapMap.containsKey(holder.getAdapterPosition())) {
                    bitmap = bitmapMap.get(holder.getAdapterPosition());
                    holder.image_video.setImageBitmap(bitmap);//集合要是存在就设置上
                } else {
    
                    Thread t = new Thread(new Runnable() {
                        public void run() {//开启线程获取视频第一帧
                            MediaMetadataRetriever retriever = new MediaMetadataRetriever(); //获取网络视频
                            try {
                                retriever.setDataSource(video, new HashMap<String, String>());
                                bitmap = retriever.getFrameAtTime();
                                bitmapMap.put(holder.getAdapterPosition(), bitmap);
                                if (bitmap != null) {
                                    Message message = handler.obtainMessage();//用handler发送通知
                                    message.what = 1;
                                    message.obj = bitmap;
                                    handler.sendMessage(message);
                                }
                            } catch (IllegalArgumentException e) {
                                e.printStackTrace();
                            } catch (RuntimeException e) {
                                e.printStackTrace();
                            } finally {
                                try {
                                    retriever.release();
                                } catch (RuntimeException e) {
                                    e.printStackTrace();
                                }
                            }
                        }
                    });
                    t.start();
                }
            }
        }