Android 使用缓存Uri作为MediaStore.EXTRA\u输出时相机不工作/保存
在从Android 使用缓存Uri作为MediaStore.EXTRA\u输出时相机不工作/保存,android,android-intent,android-camera,Android,Android Intent,Android Camera,在从片段拍照后,我正在尝试获取完整图像 如果我使用文件中的Uri(Uri.fromFile(file)),在拍摄照片并点击“确定”按钮后,相机将不会退出(看起来无法写入Uri或谁知道是什么) 使用文件字符串,格式为'/data/data/com.package.bla/cache/img1983462jpg',它也不能正常工作(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,我尝试的是: 创建文件后删除该文件,如下所示。但是,该文件在相机退出后不存在 添加了外部存储读取权
片段
拍照后,我正在尝试获取完整图像
如果我使用文件中的Uri(Uri.fromFile(file)
),在拍摄照片并点击“确定”按钮后,相机将不会退出(看起来无法写入Uri或谁知道是什么)
使用文件
字符串
,格式为'/data/data/com.package.bla/cache/img1983462jpg'
,它也不能正常工作(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,我尝试的是:
- 创建文件后删除该文件,如下所示。但是,该文件在相机退出后不存在
- 添加了外部存储读取权限,以防万一
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,Mimageri。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,尽管照片并未实际保存(即文件中有0字节)
说明:问题与保存到缓存目录有关。可能是个bug,我缺少权限,或者摄像头应用程序无法保存到你的应用程序私有数据目录中。添加权限标志\u GRANT\u WRITE\u URI\u权限无法解决此问题。相关职位:及
更新从Android 2.2开始
getExternalCacheDir()
方法可以代替getCacheDir()
试试这对我来说很有魅力
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;
}
为什么不把它保存到一个新文件中呢
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intent
cameraIntent.putExtra(MediaStore.EXTRA_OUTPUT, mImageUri);
从android 26+Uri.fromFile将不起作用,您应该改用文件提供程序 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>
在安卓8.0和5.1.1上测试
更新:在某些设备上,内置摄像头不支持额外的\u输出,因此如果要在所有设备上工作,请构建自己的摄像头模块。不工作,getAbsolutePath()返回的结果与File.toString完全相同:-(与编辑后的答案相同,我不能使用Uri作为额外的输出。拍照后,我无法通过确认屏幕(只是取消,但不能确认照片)您的问题解决了吗?您找到解决方案了吗?问题是关于
getCacheDir()
<?xml version="1.0" encoding="utf-8"?>
<paths>
<external-path
name="external"
path="." />
</paths>
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);