我想在从Fragment
上拍完照片后获得完整的图像。
如果我使用文件(Uri.fromFile(file)
)中的Uri,相机在拍摄照片并点击“ok”按钮后将不会退出(看起来无法写入Uri或谁知道是什么)。
使用File
String
,以'/data/data/com.package.bla/cache/img198346262jpg'
的形式,它不能很好地工作(文件在那里,但它是空的,因为相机没有在上面保存任何东西)。
到目前为止,我尝试了以下内容:
与this example一样,
所以我不知道为什么图像没有被保存,并且已经花费了/浪费了大量的时间来测试和弄清楚为什么它不工作。
片段:
private void launchCamera() {
Intent cameraIntent = new Intent(android.provider.MediaStore.ACTION_IMAGE_CAPTURE);
File outputDir = getActivity().getCacheDir();
File file = null;
try {
file = File.createTempFile("img", "jpg", outputDir);
} catch (IOException e) {
e.printStackTrace();
}
if (file != null) {
mImageUri = Uri.fromFile(file); //using Uri is not even exiting the camera
//mImageUri = File.toString(); //If I use String instead of an Uri, it works better (ie, can accept camera photo)
cameraIntent.putExtra(MediaStore.EXTRA_OUTPUT, mImageUri);
startActivityForResult(cameraIntent, RESULT_TAKE_IMAGE);
}
}
public void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
if (resultCode == Activity.RESULT_OK) {
Bitmap original = BitmapFactory.decodeFile(mImageUri.toString(), bounds);
}
}
编辑代码,mImageUri。如前所述,如果我使用Uri,我甚至不能接受相机应用程序中的照片。使用字符串将允许我接受照片,尽管照片实际上并未保存(即文件中有0个字节)。
EXPLANATION:该问题与保存到缓存目录有关。也许是个bug,我缺少权限,或者相机应用程序无法保存到你的应用程序私有数据目录中。添加权限FLAG_GRANT_WRITE_URI_PERMISSION不能解决这个问题。相关帖子:Store image from camera into private app cache directory和Saving camera data to cache when launched via intent
更新从Android2.2开始可以使用getExternalCacheDir()
方法代替getCacheDir()
发布于 2018-05-31 11:51:37
从安卓26+ Uri.fromFile将无法工作,您应该使用文件提供程序来代替。
AndroidManifest.xml
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
<application
.........
<provider
android:name="android.support.v4.content.FileProvider"
android:authorities="com.mydomain.fileprovider"
android:exported="false"
android:grantUriPermissions="true">
<meta-data
android:name="android.support.FILE_PROVIDER_PATHS"
android:resource="@xml/file_paths" />
</provider>
</application>
res/xml/file_paths.xml
<?xml version="1.0" encoding="utf-8"?>
<paths>
<external-path
name="external"
path="." />
</paths>
最后
final Intent takeVideoIntent = new Intent(MediaStore.ACTION_VIDEO_CAPTURE);
// output file
File path = new File(Environment.getExternalStorageDirectory(), "tmp.mp4");
// com.mydomain.fileprovider is authorities (manifest)
// getUri from file
Uri uri = FileProvider.getUriForFile(this, "com.mydomain.fileprovider", path);
takeVideoIntent.putExtra(MediaStore.EXTRA_OUTPUT, uri);
startActivityForResult(takeVideoIntent, 99);
在android 8.0和5.1.1上测试
更新:一些设备内置摄像头上的不支持EXTRA_OUTPUT,所以如果你想在所有设备上工作,请构建自己的摄像头模块。
发布于 2015-09-04 02:40:51
为什么不将其保存到新文件中
final File root = new File(Environment.getExternalStorageDirectory() + File.separator + "MyDir" + File.separator);
root.mkdirs();
final String fname = "img_"+ System.currentTimeMillis() + ".jpg";
final File sdImageMainDirectory = new File(root, fname);
mImageUri = Uri.fromFile(sdImageMainDirectory);
然后将该uri传递给意图。
cameraIntent.putExtra(MediaStore.EXTRA_OUTPUT, mImageUri);
发布于 2013-09-10 13:54:43
试试,这对我很有效,
private String selectedImagePath = "";
final private int PICK_IMAGE = 1;
final private int CAPTURE_IMAGE = 2;
public Uri setImageUri() {
// Store image in dcim
File file = new File(Environment.getExternalStorageDirectory() + "/DCIM/", "image" + new Date().getTime() + ".png");
Uri imgUri = Uri.fromFile(file);
this.imgPath = file.getAbsolutePath();
return imgUri;
}
public String getImagePath() {
return imgPath;
}
btnGallery.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
Intent intent = new Intent();
intent.setType("image/*");
intent.setAction(Intent.ACTION_GET_CONTENT);
startActivityForResult(Intent.createChooser(intent, ""), PICK_IMAGE);
}
});
btnCapture.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
final Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
intent.putExtra(MediaStore.EXTRA_OUTPUT, setImageUri());
startActivityForResult(intent, CAPTURE_IMAGE);
}
});
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
if (resultCode != Activity.RESULT_CANCELED) {
if (requestCode == PICK_IMAGE) {
selectedImagePath = getAbsolutePath(data.getData());
imgUser.setImageBitmap(decodeFile(selectedImagePath));
} else if (requestCode == CAPTURE_IMAGE) {
selectedImagePath = getImagePath();
imgUser.setImageBitmap(decodeFile(selectedImagePath));
} else {
super.onActivityResult(requestCode, resultCode, data);
}
}
}
public Bitmap decodeFile(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;
}
public String getAbsolutePath(Uri uri) {
String[] projection = { MediaColumns.DATA };
@SuppressWarnings("deprecation")
Cursor cursor = managedQuery(uri, projection, null, null, null);
if (cursor != null) {
int column_index = cursor.getColumnIndexOrThrow(MediaColumns.DATA);
cursor.moveToFirst();
return cursor.getString(column_index);
} else
return null;
}
https://stackoverflow.com/questions/18711525
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