Android 如何显示从相机捕获的图像并从文件路径显示在imageview中？
在拍摄照片并创建ImageFile后我的问题。。在ActivityResult上，照片未显示在img_照片上。如何在img_照片中显示Android 如何显示从相机捕获的图像并从文件路径显示在imageview中？,android,bitmap,android-camera,Android,Bitmap,Android Camera,在拍摄照片并创建ImageFile后我的问题。。在ActivityResult上，照片未显示在img_照片上。如何在img_照片中显示 img_photo = (ImageView) findViewById(R.id.imgPhoto); // take a photo from camera imgBtnCamera = (ImageButton) findViewById(R.id.imgBtnCamera); imgBtnCamera.s
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);
}
}
}
});
// 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;
}
@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();
}
}
}
我参加了这个链接的培训，我也遇到了同样的问题，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：我正在使用自定义相机，而不是使用现有的相机。 我将代码粘贴到下面以将捕获的图像保存到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();
}
}
});
}
我希望它能帮助你。（：试试这种方法，它会有帮助的
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;
}
}
我遇到了这个错误：getOutputMediaFileUri（PhotoSubmitActivity.java:252）、captureImage（PhotoSubmitActivity.java:175）、access$000（PhotoSubmitActivity.java:41）、onClick（PhotoSubmitActivity.java:105）