1.在页面按钮或图标控件中添加点击事件，并调用选择文件动作

    //点击图片选择视频按钮事件
    public void uploadvideo(View view){
        Intent intent = new Intent(Intent.ACTION_GET_CONTENT);   //  选择文件动作
        intent.setType("video/*");                              //  要选择的文件类型为视频
        startActivityForResult(intent,REQUEST_CODE_VIDEO);
    }

2.在 onActivityResult 方法中获取实际视频地址

    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        if (requestCode == REQUEST_CODE_VIDEO && resultCode == RESULT_OK){
            Uri fileUri = data.getData();
            // 4.4及以上系统使用这个方法处理
            if(DocumentsContract.isDocumentUri(this,fileUri)){  //4.4以上版本获取路劲
                String docID = DocumentsContract.getDocumentId(fileUri);
                String id = docID.split(":")[1];
                Cursor cursor = getContentResolver().query(MediaStore.Video.Media.EXTERNAL_CONTENT_URI,null,
                        MediaStore.Video.Media._ID+"="+id,null,null);
                if(cursor!=null){
                    if(cursor.moveToFirst()){
                        int columnId = cursor.getColumnIndex(MediaStore.Video.Media.DATA);
                        filePath = cursor.getString(columnId);
                    }
                }
            }else {   //4.4以前获取路径
                filePath = getVideoPath(fileUri, null);
            }
            if(filePath!=null){
                //根据实际路劲获取缩略图
                Bitmap thumbnail = ThumbnailUtils.createVideoThumbnail(filePath, MediaStore.Video.Thumbnails.MINI_KIND);
                if (thumbnail != null) {
                    //对上传的视频大小进行限制
                    if(getVoidSize(filePath)>=30){
                        Tools.tips(getApplicationContext(),"视频大小不能超过30M");
                    }else{
                        //将满足条件的视频缩略图显示到ImageView控件里
                        ImageView imageView = findViewById(R.id.video_img);
                        imageView.setImageBitmap(thumbnail);
                    }
                }
            }
        }
    }

3.获取视频路劲方法

    //获取视频路劲
    private String getVideoPath(Uri uri, String selection) {
        String path = null;
        // 通过Uri和selection来获取真实的视频路径
        Cursor cursor = getContentResolver().query(uri, null, selection, null, null);
        if (cursor != null) {
            if (cursor.moveToFirst()) {
                path = cursor.getString(cursor.getColumnIndex(MediaStore.Video.Media.DATA));
            }
            cursor.close();
        }
        return path;
    }

4.获取视频大小方法

    //获取视频大小
    private double getVoidSize(String filePath){
        long size = Tools.getVideoSize(filePath);
        double sizeInMegabytes = 0;
        if (size > 0) {
            // 转换为可读的格式，例如MB
            sizeInMegabytes = (size / 1024.0) / 1024.0;
        }
        return sizeInMegabytes;
    }

5.上传视频方法

    //上传视频
    private void uploadVideo(String filePath,String sjid) {
        OkHttpClient okHttpClient = new OkHttpClient();
        if(filePath!=""&&filePath!=null){
            if(filePath.contains("mp4")){
                File file=new File(filePath);
                MultipartBody.Builder builder = new MultipartBody.Builder()
                        .setType(MultipartBody.FORM)
                        .addFormDataPart("video",file.getName(), RequestBody.create(MediaType.parse("video*//*"),file))
                        .addFormDataPart("sjid",sjid);
                MultipartBody  requestBody = builder.build();
                Request request = new Request.Builder()
                        .url(Quantity.url_XluploadVideo)
                        .post(requestBody)
                        .build();
                Call call = okHttpClient.newCall(request);
                call.enqueue(new Callback() {
                    @Override
                    public void onFailure(Call call, IOException e) {
                        Log.e("TAG", "onFailure: " + e);
                        runOnUiThread(new Runnable() {
                            @Override
                            public void run() {
                                Toast.makeText(Dkxl_main.this, "视频上传失败", Toast.LENGTH_SHORT).show();
}
});
}

                    @Override
                    public void onResponse(Call call, Response response) throws IOException {
                        Log.e("TAG", "视频上传成功" + response);
                        runOnUiThread(new Runnable() {
                            @Override
                            public void run() {
                                Tools.tips(getApplicationContext(),"视频上传成功");
                            }
                        });
                    }
                });
            }
        }
    }