Android：如何在ImageView中显示视频缩略图？

此代码适用于拍摄图像并显示图像.视频也会被录制并保存到手机中,但不会显示在ImageView中.有关如何修改我的代码以使视频出现在ImageView中的任何建议？

除了：RESULT_LOAD_VID部分之外,一切似乎都能正常工作,它应该将选定或录制的视频显示到ImageView.

我收到的错误是：“SkImageDecoder :: Factory返回null”

据我所知,这意味着无论出于何种原因,所选/录制的视频位置都没有传递到RESULT_LOAD_VID部分.

任何帮助表示赞赏.

这是我目前的代码：

public class Media extends AppCompatActivity{

    private static int RESULT_LOAD_IMG = 1;
    private static int RESULT_LOAD_VID = 1;
    String imgDecodableString;
    private String SELEctedImagePath = "";
    private static final int CAPTURE_VIDEO_ACTIVITY_requEST_CODE = 200;
    final privatE int CAPTURE_IMAGE = 2;
    private Uri fileUri;
    private ImageView mImageView;
    Toolbar toolbar;
    private String imgPath;

    @Override
    public Boolean onCreateOptionsMenu(Menu menu) {
        MenuInflater inflater = getMenuInflater();
        inflater.inflate(R.menu.toolbarmedia,menu);
        return true;
    }

    @Override
    public Boolean onOptionsItemSELEcted(MenuItem item) {
        switch (item.getItemId()) {
            case R.id.camera:
                AlertDialog.builder builder = new AlertDialog.builder(Media.this);
                // builder.settitle("Choose Image source");
                builder.setItems(new CharSequence[] { "Take a Photo","Choose from Gallery" },new DialogInterface.onClickListener() {

                            @Override
                            public void onClick(DialogInterface dialog,int which) {
                                switch (which) {
                                    case 0:
                                        Intent intent1 = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
                                        intent1.putExtra(MediaStore.EXTRA_OUTPUT,setImageUri());
                                        startActivityForResult(intent1,CAPTURE_IMAGE);
                                        break;
                                    case 1:
                                        // CreatE intent to Open Image applications like Gallery,Google Photos
                                        Intent galleryIntent = new Intent(Intent.ACTION_PICK,android.provider.MediaStore.Images.Media.EXTERNAL_CONTENT_URI);
                                        startActivityForResult(galleryIntent,RESULT_LOAD_IMG);
                                        break;
                                    default:
                                        break;
                                }
                            }
                        });
                builder.show();
                return true;

            case R.id.video:

                AlertDialog.builder builder2 = new AlertDialog.builder(Media.this);
                // builder.settitle("Choose Image source");
                builder2.setItems(new CharSequence[]{"Take a Video","SELEct Video from Phone"},int which) {
                                switch (which) {
                                    case 0:
                                        //create new Intent
                                        Intent intent_video = new Intent(MediaStore.ACTION_VIDEO_CAPTURE);

                                        fileUri = getOutputMediaFileUri(MEDIA_TYPE_VIDEO);  // create a file to save the video
                                        intent_video.putExtra(MediaStore.EXTRA_OUTPUT,fileUri);  // set the image file name

                                        intent_video.putExtra(MediaStore.EXTRA_VIDEO_QUALITY,1); // set the video image quality to high
                                        // start the Video CapturE intent
                                        startActivityForResult(intent_video,CAPTURE_VIDEO_ACTIVITY_requEST_CODE);
                                        break;
                                    case 1:
                                        // CreatE intent to Open Image applications like Gallery,android.provider.MediaStore.Video.Media.EXTERNAL_CONTENT_URI);
                                        startActivityForResult(galleryIntent,RESULT_LOAD_VID);
                                        break;
                                    default:
                                        break;
                                }
                            }
                        });
                builder2.show();
                return true;

            case R.id.mic:

                return true;

            default:
                // If we got here,the user's action was not recognized.
                // Invoke the superclass to handle it.
                return super.onOptionsItemSELEcted(item);

        }
    }

    @Override
    public void onCreate(Bundle savedInstanceStatE) {
        super.onCreate(savedInstanceStatE);
        setContentView(R.layout.activity_media);
        toolbar = (Toolbar)findViewById(R.id.toolbar);
        setSupportActionBar(toolbar);

        mImageView = (ImageView) findViewById(R.id.media_display);
    }

    @Override
    protected void onActivityResult(int requestCode,int resultCode,Intent data) {
        super.onActivityResult(requestCode,resultCode,data);
        try {
            // When an Image is picked
            if (requestCode == RESULT_LOAD_IMG && resultCode == RESULT_OK && null != data) {
                // Get the Image from data

                Uri SELEctedImage = data.getData();
                String[] filePathcolumn = {MediaStore.Images.Media.DATA};

                // Get the cursor
                cursor cursor = getContentResolver().query(SELEctedImage,filePathcolumn,null,null);
                // Move to first row
                cursor.moveToFirst();

                int columnIndex = cursor.getcolumnIndex(filePathcolumn[0]);
                imgDecodableString = cursor.getString(columnIndeX);
                cursor.close();
                ImageView imgView = (ImageView) findViewById(R.id.media_display);
                // Set the Image in ImageView after decoding the String
                imgView.setImageBitmap(BitmapFactory.decodeFile(imgDecodableString));

            } else if (requestCode == CAPTURE_IMAGE) {
                SELEctedImagePath = getImagePath();
                System.out.println("path" + SELEctedImagePath);
                mImageView.setImageBitmap(decodeStream(SELEctedImagePath));
            } else if(requestCode == RESULT_LOAD_VID && resultCode == RESULT_OK  && null != data){
                // Get the Image from data
                Uri SELEctedVideo = data.getData();
                String[] filePathcolumn = {MediaStore.Video.Media.DATA};
                 //Get the cursor
               cursor cursor = getContentResolver().query(SELEctedVideo,null);
                // Move to first row
               cursor.moveToFirst();
                int columnIndex = cursor.getcolumnIndex(filePathcolumn[0]);
                imgDecodableString = cursor.getString(columnIndeX);
                cursor.close();
                ImageView vidView = (ImageView) findViewById(R.id.media_display);
                // Set the Image in ImageView after decoding the String
               vidView.setImageBitmap(BitmapFactory.decodeFile(imgDecodableString));
            }else if (requestCode == CAPTURE_VIDEO_ACTIVITY_requEST_CODE) {
                if (resultCode == RESULT_OK) {
                    // Video captured and saved to fileUri specified in thE intent
                    Toast.makeText(this,"Video Saved to Phone",Toast.LENGTH_LONG).show();
                } else if (resultCode == RESULT_CANCELED) {
                    // User cancelled the video capture
                } else {

                    // Video capture Failed,advise user
                    Toast.makeText(this,"Video capture Failed.",Toast.LENGTH_LONG).show();
                    super.onActivityResult(requestCode,data);
                }
            }
        } catch (Exception E) {
            Toast.makeText(this,"Something went wrong",Toast.LENGTH_LONG)
                    .show();
        }
    }

    public static final int MEDIA_TYPE_IMAGE = 1;
    public static final int MEDIA_TYPE_VIDEO = 2;

    /** Create a file Uri for saving an image or video */
    private static Uri getOutputMediaFileUri(int typE){
        return Uri.fromFile(getOutputMediaFile(typE));
    }

    /** Create a File for saving an image or video */
    private static File getOutputMediaFile(int typE){
        // To be safe,you should check that the SDCard is mounted
        // using Environment.getExternalStorageState() before doing this.

        File mediaStorageDir = new File(Environment.getExternalStoragePublicDirectory(
                Environment.DIRECTORY_PICTURES),"MyCameraApp");
        // This LOCATIOn works best if you want the created images to be shared
        // @R_618_7000@n applications and persist after your app has been uninstalled.

        // Create the storage directory if it does not exist
        if (! mediaStorageDir.exists()){
            if (! mediaStorageDir.mkdirs()){
                Log.d("MyCameraApp","Failed to create directory");
                return null;
            }
        }

        // Create a media file name
        String timestamp = new SimpleDateFormat("yyyymMdd_HHmmss").format(new Date());
        File mediaFile;
        if (type == MEDIA_TYPE_IMAGE){
            mediaFile = new File(mediaStorageDir.getPath() + File.separator +
                    "IMG_"+ timestamp + ".jpg");
        } else if(type == MEDIA_TYPE_VIDEO) {
            mediaFile = new File(mediaStorageDir.getPath() + File.separator +
                    "VID_"+ timestamp + ".mp4");
        } else {
            return null;
        }

        return mediaFile;
    }

    public Uri setImageUri() {

       File file = new File(Environment.getExternalStorageDirectory(),"image" + new     Date().getTime() + ".png");
        Uri imguri = Uri.fromFile(filE);
       this.imgPath = file.getAbsolutePath();
       return imguri;
   }


    public String getImagePath() {
        return imgPath;
    }

    public Bitmap decodeStream(String path) {
        try {
            // Decode image size
            BitmapFactory.options o = new BitmapFactory.options();
            o.inJustDecodeBounds = true;
            BitmapFactory.decodeFile(path,o);
            // The new size we want to scale to
            final int required_SIZE = 70;

            // Find the correct scale value. It should be the power of
            // 2.
            int scale = 1;
            while (o.outWidth / scale / 2 >= required_SIZE
                    && o.outHeight / scale / 2 >= required_SIZE)
                scale *= 2;

            // Decode with inSampleSize
            BitmapFactory.options o2 = new BitmapFactory.options();
            o2.inSampleSize = scale;
            return BitmapFactory.decodeFile(path,o2);
        } catch (Throwable E) {
            e.printStackTrace();
        }
        return null;
    }

}