如何创建URI位置来保存相机拍摄的照片？
我创建了一个意图，以启动相机拍摄照片。我想通过EXTRA_OUTPUT额外传递URI位置。如何生成这样的URI。
答案 0 :(得分：1)
我创建了PictureUtils类，用于从相机和图库中捕获图像。这是下面的代码
PictureUtils.java
public class PictureUtils {
private static String fileName;
public Activity activity;
public PictureUtils(Activity activity){
this.activity = activity;
}
public Uri openCameraIntent(int requestCode) {
Uri file = null;
Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.N) {
file = FileProvider.getUriForFile(activity, BuildConfig.APPLICATION_ID + ".provider", getOutputMediaFile());
} else {
file = Uri.fromFile(getOutputMediaFile());
}
intent.putExtra(MediaStore.EXTRA_OUTPUT, file);
activity.startActivityForResult(intent, requestCode);
return file;
}
public void openGalleryIntent(int requestCode) {
Intent pickPhoto = new Intent(Intent.ACTION_PICK,
MediaStore.Images.Media.EXTERNAL_CONTENT_URI);
pickPhoto.addFlags(Intent.FLAG_GRANT_READ_URI_PERMISSION);
activity.startActivityForResult(pickPhoto, requestCode);
}
private static File getOutputMediaFile() {
File mediaStorageDir = new File(Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_PICTURES) + "/RVRB");
if (!mediaStorageDir.exists()) {
if (!mediaStorageDir.mkdirs()) {
return null;
}
}
String timeStamp = String.valueOf(System.currentTimeMillis());
fileName = timeStamp + ".jpg";
return new File(mediaStorageDir.getAbsolutePath() + File.separator + fileName);
}
public ImagesData resultFromCamera(Intent data) {
File imageFile = null;
float rotationDegree = 0;
String exifOrientation;
ExifInterface exif = null;
Bitmap rotatedBitmap = null;
File storageDir = new File(Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_PICTURES) + "/RVRB");
boolean success = true;
if (!storageDir.exists()) {
success = storageDir.mkdirs();
}
if (success) {
imageFile = new File(storageDir, fileName);
}
try {
exif = new ExifInterface(imageFile.getAbsolutePath());
exifOrientation = exif.getAttribute(ExifInterface.TAG_ORIENTATION);
if (Integer.parseInt(exifOrientation) >= 0 && Integer.parseInt(exifOrientation) <= 1) {
rotationDegree = 0;
} else if (Integer.parseInt(exifOrientation) >= 2 && Integer.parseInt(exifOrientation) <= 4) {
rotationDegree = 180;
} else if (Integer.parseInt(exifOrientation) >= 7 && Integer.parseInt(exifOrientation) >= 8) {
rotationDegree = 270;
} else {
rotationDegree = 90;
}
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
if (Build.VERSION.SDK_INT < Build.VERSION_CODES.M) {
Bitmap thumbnail = null;
if (data != null && data.getData() != null) {
try {
thumbnail = MediaStore.Images.Media.getBitmap(activity.getContentResolver(), data.getData());
Matrix matrix = new Matrix();
matrix.postRotate(rotationDegree);
Bitmap scaledBitmap = Bitmap.createScaledBitmap(thumbnail, thumbnail.getWidth(), thumbnail.getHeight(), true);
rotatedBitmap = Bitmap.createBitmap(scaledBitmap, 0, 0, scaledBitmap.getWidth(), scaledBitmap.getHeight(), matrix, true);
if (imageFile != null) {
OutputStream fOut = new FileOutputStream(imageFile);
rotatedBitmap.compress(Bitmap.CompressFormat.JPEG, 70, fOut);
fOut.close();
}
} catch (IOException e) {
e.printStackTrace();
} catch (Exception e) {
e.printStackTrace();
}
} else {
try {
thumbnail = MediaStore.Images.Media.getBitmap(activity.getContentResolver(), Uri.fromFile(imageFile));
Matrix matrix = new Matrix();
matrix.postRotate(rotationDegree);
Bitmap scaledBitmap = Bitmap.createScaledBitmap(thumbnail, thumbnail.getWidth(), thumbnail.getHeight(), true);
rotatedBitmap = Bitmap.createBitmap(scaledBitmap, 0, 0, scaledBitmap.getWidth(), scaledBitmap.getHeight(), matrix, true);
if (imageFile != null) {
OutputStream fOut = new FileOutputStream(imageFile);
rotatedBitmap.compress(Bitmap.CompressFormat.JPEG, 70, fOut);
fOut.close();
}
} catch (IOException e) {
e.printStackTrace();
} catch (Exception e) {
e.printStackTrace();
}
}
} else {
try {
Bitmap bitmap = null;
imageFile = new File(storageDir, fileName);
bitmap = MediaStore.Images.Media.getBitmap(activity.getContentResolver(), Uri.fromFile(imageFile));
if (bitmap != null && (bitmap.getHeight() < bitmap.getWidth())) {
Matrix matrix = new Matrix();
matrix.postRotate(rotationDegree);
Bitmap scaledBitmap = Bitmap.createScaledBitmap(bitmap, bitmap.getWidth(), bitmap.getHeight(), true);
rotatedBitmap = Bitmap.createBitmap(scaledBitmap, 0, 0, scaledBitmap.getWidth(), scaledBitmap.getHeight(), matrix, true);
if (imageFile != null) {
OutputStream fOut = new FileOutputStream(imageFile);
rotatedBitmap.compress(Bitmap.CompressFormat.JPEG, 70, fOut);
fOut.close();
}
} else {
rotatedBitmap = bitmap;
}
} catch (IOException e) {
e.printStackTrace();
} catch (Exception e) {
e.printStackTrace();
}
}
return new ImagesData(imageFile, rotatedBitmap);
}
public ImagesData imageFromGallery(Intent data) {
File imageFile = null;
float rotationDegree = 0;
Bitmap rotatedBitmap = null;
try {
Bitmap bm = null;
Uri selectedImage = null;
if (data != null && data.getData() != null) {
try {
selectedImage = data.getData();
bm = MediaStore.Images.Media.getBitmap(activity.getContentResolver(), selectedImage);
} catch (IOException e) {
e.printStackTrace();
}
} else {
try {
bm = (Bitmap) data.getExtras().get("data");
} catch (Exception e) {
e.printStackTrace();
}
}
String timeStamp = String.valueOf(System.currentTimeMillis());
String fileName = timeStamp + ".jpg";
File storageDir = new File(Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_PICTURES) + "/RVRB");
boolean success = true;
if (!storageDir.exists()) {
success = storageDir.mkdirs();
}
if (success) {
imageFile = new File(storageDir, fileName);
}
rotationDegree = getRotationFromURI(selectedImage, activity);
Matrix matrix = new Matrix();
matrix.postRotate(rotationDegree);
Bitmap scaledBitmap = Bitmap.createScaledBitmap(bm, bm.getWidth(), bm.getHeight(), true);
rotatedBitmap = Bitmap.createBitmap(scaledBitmap, 0, 0, scaledBitmap.getWidth(), scaledBitmap.getHeight(), matrix, true);
if (imageFile != null) {
OutputStream fOut = new FileOutputStream(imageFile);
rotatedBitmap.compress(Bitmap.CompressFormat.JPEG, 70, fOut);
fOut.close();
}
} catch (Exception e) {
e.printStackTrace();
}
return new ImagesData(imageFile, rotatedBitmap);
}
private int getRotationFromURI(Uri contentUri, Context mContext) {
Cursor cursor = null;
try {
String[] proj = new String[]{MediaStore.Images.ImageColumns.ORIENTATION};
cursor = mContext.getContentResolver().query(contentUri, proj, null, null, null);
assert cursor != null;
cursor.moveToFirst();
return cursor.getInt(0);
} catch (Exception e) {
e.printStackTrace();
} finally {
if (cursor != null) {
cursor.close();
}
}
return 0;
}
public class ImagesData {
File imageFile = null;
Bitmap bitmap = null;
private ImagesData(File imageFile, Bitmap bitmap) {
this.imageFile = imageFile;
this.bitmap = bitmap;
}
public File getImageFile() {
return imageFile;
}
public void setImageFile(File imageFile) {
this.imageFile = imageFile;
}
public Bitmap getBitmap() {
return bitmap;
}
public void setBitmap(Bitmap bitmap) {
this.bitmap = bitmap;
}
}
}
现在，只要按一下任何按钮，就可以使用以下方法调用相机意图。
全球宣言：Uri fileUri;
PictureUtils images = new PictureUtils(ArtistAddEditMembers.this);
fileUri = images.openCameraIntent(REQUEST_OPEN_CAMERA);
您可以使用以下方法以onActivityResult方法处理结果。
@Override
public void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
if (resultCode == Activity.RESULT_OK) {
if (requestCode == REQUEST_OPEN_CAMERA) {
try {
PictureUtils images = new PictureUtils(ArtistAddEditMembers.this);
PictureUtils.ImagesData imagesData = images.resultFromCamera(data);
imageFile = imagesData.getImageFile();
finalBitmap = imagesData.getBitmap();
displayImagePreview(finalBitmap);
} catch (Exception e) {
e.printStackTrace();
}
} else if (requestCode == REQUEST_OPEN_GALLERY) {
try {
PictureUtils images = new PictureUtils(ArtistAddEditMembers.this);
PictureUtils.ImagesData imagesData = images.imageFromGallery(data);
imageFile = imagesData.getImageFile();
finalBitmap = imagesData.getBitmap();
displayImagePreview(finalBitmap);
} catch (Exception e) {
e.printStackTrace();
}
}
}
}
对于在imageview中显示图像
public void displayImagePreview(Bitmap bitmap) {
Glide.with(mContext).load(bitmap).into(ivUserProfile);
}
或者您可以简单地在imageview中设置图像位图，而无需使用glide。
我在上面的示例中处理了以下情况。
FileProvider.getUriForFile和Uri.fromFile用于较低版本。在AndroidManefest.xml文件中的文件提供商的应用程序标签下添加以下代码
<application
......>
<provider
android:name="android.support.v4.content.FileProvider"
android:authorities="${applicationId}.provider"
android:exported="false"
android:grantUriPermissions="true">
<meta-data
android:name="android.support.FILE_PROVIDER_PATHS"
android:resource="@xml/filepaths" />
</provider>
</application>
在xml资源目录下创建filepaths.xml文件
<?xml version="1.0" encoding="utf-8"?>
<paths>
<external-path name="external_files" path="."/>
</paths>
在调用摄像机意图之前，请确保您已弹出并处理“摄像机”的运行时权限并“写入内部存储”权限。
答案 1 :(得分：0)
使用此代码生成文件并将其调用到相机意图中
File imagefile = null;
try {
imagefile = createImageFile();
} catch (IOException ex) {
// Error while creating the File
Log.i(TAG, "IOException");
}
if (imagefile != null) {
cameraIntent.putExtra(MediaStore.EXTRA_OUTPUT, Uri.fromFile(photoFile));
startActivityForResult(cameraIntent, REQUEST_IMAGE_CAPTURE);
}
这是生成Imagefile的代码
private File createImageFile() throws IOException {
String imageFileName = "JPEG_" + System.currentTimeMillis() + "_";
File storageDir = Environment.getExternalStoragePublicDirectory(
Environment.DIRECTORY_PICTURES);
File image = File.createTempFile(
imageFileName, // prefix
".jpg", // suffix
storageDir // directory
);
return image;
}
答案 2 :(得分：0)
private void SaveImage(Bitmap finalBitmap) {
String root = Environment.getExternalStorageDirectory().toString();
File myDir = new File(root + "/saved_images");
myDir.mkdirs();
Random generator = new Random();
int n = 10000;
n = generator.nextInt(n);
String fname = "Image-"+ n +".jpg";
File file = new File (myDir, fname);
if (file.exists ()) file.delete ();
try {
FileOutputStream out = new FileOutputStream(file);
finalBitmap.compress(Bitmap.CompressFormat.JPEG, 90, out);
out.flush();
out.close();
} catch (Exception e) {
e.printStackTrace();
}
}