如何显示来自相机的捕获图像并从文件路径显示在图像视图中？ [复制]
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【中文标题】如何显示来自相机的捕获图像并从文件路径显示在图像视图中？ [复制]【英文标题】：How to display capture image from camera and display in imageview from file path? [duplicate] 【发布时间】：2017-05-12 07:46:39 【问题描述】：拍照后我的问题，然后 createImageFile .. onActivityResult，照片没有出现在 img_photo 上。如何让 img_photo 出现？
img_photo = (ImageView) findViewById(R.id.imgPhoto);
// take a photo from camera
imgBtnCamera = (ImageButton) findViewById(R.id.imgBtnCamera);
imgBtnCamera.setOnClickListener(new View.OnClickListener()
@Override
public void onClick(View v)
Intent takePictureIntent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
if (takePictureIntent.resolveActivity(getPackageManager()) != null)
// Create the File where the photo should go
File photoFile = null;
try
photoFile = createImageFile();
catch (IOException ex)
// Error occurred while creating the File
// Continue only if the File was successfully created
if (photoFile != null)
Uri photoURI = FileProvider.getUriForFile(PhotoSubmitActivity.this,
"com.example.android.fileprovider", photoFile);
takePictureIntent.putExtra(MediaStore.EXTRA_OUTPUT, photoURI);
startActivityForResult(takePictureIntent, REQUEST_IMAGE_CAPTURE);
);
创建图片文件
// Create image file
private File createImageFile() throws IOException
// Create an image file name
String timeStamp = new SimpleDateFormat("yyyyMMdd_HHmmss").format(new Date());
String imageFileName = "JPEG_" + timeStamp + "_";
File storageDir = getExternalFilesDir(Environment.DIRECTORY_PICTURES);
File image = File.createTempFile(
imageFileName, /* prefix */
".jpg", /* suffix */
storageDir /* directory */
);
// Save a file: path for use with ACTION_VIEW intents
mCurrentPhotoPath = image.getAbsolutePath();
return image;
onActivityResult
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data)
super.onActivityResult(requestCode, resultCode, data);
if (requestCode == REQUEST_IMAGE_CAPTURE && resultCode == RESULT_OK)
try
Log.v("This is totally working", "Yeah!");
bitmap = MediaStore.Images.Media.getBitmap(this.getContentResolver(), Uri.parse(mCurrentPhotoPath));
img_photo.setScaleType(ImageView.ScaleType.CENTER_CROP);
img_photo.setImageBitmap(bitmap);
catch (IOException e)
e.printStackTrace();
我在此链接上参加了培训Taking Photos Simply
【问题讨论】：
【参考方案1】：我也有同样的问题。但我解决了。 @Driyanto Saputro 在我的代码中看到我在 ImageView 中为保存捕获的图像添加了注释。 另请注意：我正在使用不使用现有相机的自定义相机。 我将下面的代码粘贴到将捕获的图像保存在 imageView 中。
public void CaptureImage()
mCamera.takePicture(null, null, new Camera.PictureCallback()
private File imageFile;
@Override
public void onPictureTaken(byte[] data, Camera camera)
try
// Convert byte array into bitmap
final Bitmap originalBitmap = MainActivity.decodeSampledBitmapFromByte(getApplicationContext(), data);
// Rotate Image
Matrix rotateMatrix = new Matrix();
final Bitmap rotatedBitmap;
if (mCameraId == CAMERA_FACING_FRONT)
rotateMatrix.postRotate(270);
else
rotateMatrix.postRotate(90);
rotatedBitmap = Bitmap.createBitmap(originalBitmap, 0, 0, originalBitmap.getWidth(), originalBitmap.getHeight(), rotateMatrix, false);
final File imageFolder;
if (Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED))
imageFolder = new File(Environment.getExternalStorageDirectory() + "/CameraApp/Images");
else
imageFolder = new File(Environment.getExternalStorageDirectory() + "/CameraApp/Images");
boolean success = true;
if (!imageFolder.exists())
success = imageFolder.mkdirs();
if (success)
java.util.Date date = new java.util.Date();
imageFile = new File(imageFolder.getAbsolutePath() + File.separator + getFileNameCustomFormat() + " " + "Image.jpg");
SavedImagePath = getFileNameCustomFormat() + " " + "Image.jpg";
// imageFile.createNewFile();
else
Toast.makeText(getBaseContext(), "Image Not saved", Toast.LENGTH_SHORT).show();
return;
ByteArrayOutputStream outputStream = new ByteArrayOutputStream();
// Save image into gallery
if (rotatedBitmap != null)
rotatedBitmap.compress(Bitmap.CompressFormat.JPEG, 90, outputStream);
FileOutputStream file_out = new FileOutputStream(imageFile);
file_out.write(outputStream.toByteArray());
file_out.close();
ContentValues values = new ContentValues();
values.put(MediaStore.Images.Media.DATE_TAKEN, System.currentTimeMillis());
values.put(MediaStore.Images.Media.MIME_TYPE, "image/jpeg");
values.put(MediaStore.MediaColumns.DATA, imageFile.getAbsolutePath());
getApplicationContext().getContentResolver().insert(MediaStore.Images.Media.EXTERNAL_CONTENT_URI, values);
Toast.makeText(getApplicationContext(), "Photo Captured", Toast.LENGTH_SHORT).show();
// Code For Captured Image Save in a ImageView.
MainActivity.this.runOnUiThread(new Runnable()
@Override
public void run()
String imagePath = imageFolder.getAbsolutePath() + File.separator + SavedImagePath;
Uri myURI = Uri.parse(imagePath);
imgBtnThumbnail.setImageURI(myURI);
Toast.makeText(getApplicationContext(), "Photo Saved on ImageView", Toast.LENGTH_SHORT).show();
);
mCamera.startPreview();
catch (Exception e)
e.printStackTrace();
);
希望对你有帮助。(:
【讨论】：
【参考方案2】：试试这个方法会有帮助的
public class MainActivity extends Activity
// Activity request codes
private static final int CAMERA_CAPTURE_IMAGE_REQUEST_CODE = 100;
private static final int CAMERA_CAPTURE_VIDEO_REQUEST_CODE = 200;
public static final int MEDIA_TYPE_IMAGE = 1;
public static final int MEDIA_TYPE_VIDEO = 2;
// directory name to store captured images and videos
private static final String IMAGE_DIRECTORY_NAME = "Hello Camera";
private Uri fileUri; // file url to store image/video
private ImageView imgPreview;
private VideoView videoPreview;
private Button btnCapturePicture, btnRecordVideo;
@Override
protected void onCreate(Bundle savedInstanceState)
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
imgPreview = (ImageView) findViewById(R.id.imgPreview);
videoPreview = (VideoView) findViewById(R.id.videoPreview);
btnCapturePicture = (Button) findViewById(R.id.btnCapturePicture);
btnRecordVideo = (Button) findViewById(R.id.btnRecordVideo);
/**
* Capture image button click event
*/
btnCapturePicture.setOnClickListener(new View.OnClickListener()
@Override
public void onClick(View v)
// capture picture
captureImage();
);
/**
* Record video button click event
*/
btnRecordVideo.setOnClickListener(new View.OnClickListener()
@Override
public void onClick(View v)
// record video
recordVideo();
);
// Checking camera availability
if (!isDeviceSupportCamera())
Toast.makeText(getApplicationContext(),
"Sorry! Your device doesn't support camera",
Toast.LENGTH_LONG).show();
// will close the app if the device does't have camera
finish();
/**
* Checking device has camera hardware or not
* */
private boolean isDeviceSupportCamera()
if (getApplicationContext().getPackageManager().hasSystemFeature(
PackageManager.FEATURE_CAMERA))
// this device has a camera
return true;
else
// no camera on this device
return false;
/**
* Capturing Camera Image will lauch camera app requrest image capture
*/
private void captureImage()
Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
fileUri = getOutputMediaFileUri(MEDIA_TYPE_IMAGE);
intent.putExtra(MediaStore.EXTRA_OUTPUT, fileUri);
// start the image capture Intent
startActivityForResult(intent, CAMERA_CAPTURE_IMAGE_REQUEST_CODE);
/**
* Here we store the file url as it will be null after returning from camera
* app
*/
@Override
protected void onSaveInstanceState(Bundle outState)
super.onSaveInstanceState(outState);
// save file url in bundle as it will be null on scren orientation
// changes
outState.putParcelable("file_uri", fileUri);
@Override
protected void onRestoreInstanceState(Bundle savedInstanceState)
super.onRestoreInstanceState(savedInstanceState);
// get the file url
fileUri = savedInstanceState.getParcelable("file_uri");
/**
* Recording video
*/
private void recordVideo()
Intent intent = new Intent(MediaStore.ACTION_VIDEO_CAPTURE);
fileUri = getOutputMediaFileUri(MEDIA_TYPE_VIDEO);
// set video quality
intent.putExtra(MediaStore.EXTRA_VIDEO_QUALITY, 1);
intent.putExtra(MediaStore.EXTRA_OUTPUT, fileUri); // set the image file
// name
// start the video capture Intent
startActivityForResult(intent, CAMERA_CAPTURE_VIDEO_REQUEST_CODE);
/**
* Receiving activity result method will be called after closing the camera
* */
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data)
// if the result is capturing Image
if (requestCode == CAMERA_CAPTURE_IMAGE_REQUEST_CODE)
if (resultCode == RESULT_OK)
// successfully captured the image
// display it in image view
previewCapturedImage();
else if (resultCode == RESULT_CANCELED)
// user cancelled Image capture
Toast.makeText(getApplicationContext(),
"User cancelled image capture", Toast.LENGTH_SHORT)
.show();
else
// failed to capture image
Toast.makeText(getApplicationContext(),
"Sorry! Failed to capture image", Toast.LENGTH_SHORT)
.show();
else if (requestCode == CAMERA_CAPTURE_VIDEO_REQUEST_CODE)
if (resultCode == RESULT_OK)
// video successfully recorded
// preview the recorded video
previewVideo();
else if (resultCode == RESULT_CANCELED)
// user cancelled recording
Toast.makeText(getApplicationContext(),
"User cancelled video recording", Toast.LENGTH_SHORT)
.show();
else
// failed to record video
Toast.makeText(getApplicationContext(),
"Sorry! Failed to record video", Toast.LENGTH_SHORT)
.show();
/**
* Display image from a path to ImageView
*/
private void previewCapturedImage()
try
// hide video preview
videoPreview.setVisibility(View.GONE);
imgPreview.setVisibility(View.VISIBLE);
// bimatp factory
BitmapFactory.Options options = new BitmapFactory.Options();
// downsizing image as it throws OutOfMemory Exception for larger
// images
options.inSampleSize = 8;
final Bitmap bitmap = BitmapFactory.decodeFile(fileUri.getPath(),
options);
imgPreview.setImageBitmap(bitmap);
catch (NullPointerException e)
e.printStackTrace();
/**
* Previewing recorded video
*/
private void previewVideo()
try
// hide image preview
imgPreview.setVisibility(View.GONE);
videoPreview.setVisibility(View.VISIBLE);
videoPreview.setVideoPath(fileUri.getPath());
// start playing
videoPreview.start();
catch (Exception e)
e.printStackTrace();
/**
* ------------ Helper Methods ----------------------
* */
/**
* Creating file uri to store image/video
*/
public Uri getOutputMediaFileUri(int type)
return Uri.fromFile(getOutputMediaFile(type));
/**
* returning image / video
*/
private static File getOutputMediaFile(int type)
// External sdcard location
File mediaStorageDir = new File(
Environment
.getExternalStoragePublicDirectory(Environment.DIRECTORY_PICTURES),
IMAGE_DIRECTORY_NAME);
// Create the storage directory if it does not exist
if (!mediaStorageDir.exists())
if (!mediaStorageDir.mkdirs())
Log.d(IMAGE_DIRECTORY_NAME, "Oops! Failed create "
+ IMAGE_DIRECTORY_NAME + " directory");
return null;
// Create a media file name
String timeStamp = new SimpleDateFormat("yyyyMMdd_HHmmss",
Locale.getDefault()).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;
http://www.androidhive.info/2013/09/android-working-with-camera-api/
【讨论】：
我收到这个错误：getOutputMediaFileUri(PhotoSubmitActivity.java:252), captureImage(PhotoSubmitActivity.java:175), access$000(PhotoSubmitActivity.java:41), onClick(PhotoSubmitActivity.java:105)以上是关于如何显示来自相机的捕获图像并从文件路径显示在图像视图中？ [复制]的主要内容，如果未能解决你的问题，请参考以下文章