我试图从Fragment拍摄照片后获得完整的图像。
如果我使用文件中的Uri（Uri.fromFile(file)），相机将在拍摄照片并点击“确定”按钮后退出（看起来无法写入Uri或谁知道什么）。
以File的形式使用String '/data/data/com.package.bla/cache/img198346262jpg'，它的效果不佳（文件在那里，但它是空的，因为相机没有保存任何内容）
到目前为止我尝试了什么：
所以我不知道为什么图像没有被保存，已经花费/浪费了大量时间测试并弄清楚它为什么不起作用。
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);
}
}
编辑的代码，mImageUri。如上所述，如果我使用Uri，我甚至无法接受相机应用程序中的照片。使用String会让我接受照片，虽然照片实际上没有保存（即文件里面有0个字节）。
说明：问题与保存到缓存目录有关。也许这是一个错误，我错过了一个权限或相机应用程序只是无法保存到您的应用程序私人数据目录。添加权限FLAG_GRANT_WRITE_URI_PERMISSION没有解决它。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Android 2.2开始，可以使用getExternalCacheDir()方法代替getCacheDir()
答案 0 :(得分：3)
为什么不将其保存在新文件中
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);
答案 1 :(得分：3)
将无效，您应该使用文件提供程序。
的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
某些设备内置摄像头上的更新不支持EXTRA_OUTPUT，因此如果您想在所有设备上工作，请构建自己的相机模块。
答案 2 :(得分：1)
试试这个就像魅力一样
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;
}