Android 从相机上拍摄片段
在我的Android 从相机上拍摄片段,android,android-fragments,android-camera,Android,Android Fragments,Android Camera,在我的Fragment中,我尝试从我的相机拍摄照片,但是没有调用我的Fragment的onActivityResult。拍照后,此片段未显示,正在切换到我的第一个片段。有没有其他方法可以在片段中捕获照片,或者我做错了什么 这是我目前的代码: public void takePhoto() { Intent intent = new Intent("android.media.action.IMAGE_CAPTURE"); File photo = new File
Fragment
中,我尝试从我的相机拍摄照片,但是没有调用我的Fragment
的onActivityResult
。拍照后,此片段
未显示,正在切换到我的第一个片段
。有没有其他方法可以在片段中捕获照片,或者我做错了什么
这是我目前的代码:
public void takePhoto() {
Intent intent = new Intent("android.media.action.IMAGE_CAPTURE");
File photo = new File(Environment.getExternalStorageDirectory(), "Pic.jpg");
intent.putExtra(MediaStore.EXTRA_OUTPUT,
Uri.fromFile(photo));
imageUri = Uri.fromFile(photo);
PhotosListFragment.this.startActivityForResult(intent, 100);
}
@Override
public void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
switch (requestCode) {
case 100:
if (resultCode == Activity.RESULT_OK) {
Uri selectedImage = imageUri;
getActivity().getContentResolver().notifyChange(selectedImage, null);
ContentResolver cr = getActivity().getContentResolver();
Bitmap bitmap;
try {
bitmap = android.provider.MediaStore.Images.Media
.getBitmap(cr, selectedImage);
viewHolder.imageView.setImageBitmap(bitmap);
Toast.makeText(getActivity(), selectedImage.toString(),
Toast.LENGTH_LONG).show();
} catch (Exception e) {
Toast.makeText(getActivity(), "Failed to load", Toast.LENGTH_SHORT)
.show();
Log.e("Camera", e.toString());
}
}
}
}
我试过你的代码,很好,伙计。我变了
PhotosListFragment.this.startActivityForResult(intent, 100);
到
拍完照片后,回到同样的活动中
我想你的两个片段是在同一个活动中
如果是这种情况,我建议您创建一个新的活动,并将新片段放在其中。希望这能帮助您:
public class CameraImage extends Fragment {
private static final int CAPTURE_IMAGE_ACTIVITY_REQUEST_CODE = 1888;
Button button;
ImageView imageView;
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
final View rootView = inflater.inflate(R.layout.camera_image,
container, false);
button = (Button) rootView.findViewById(R.id.button);
imageView = (ImageView) rootView.findViewById(R.id.imageview);
button.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View view) {
Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
startActivityForResult(intent,
CAPTURE_IMAGE_ACTIVITY_REQUEST_CODE);
}
});
return rootView;
}
@Override
public void onActivityResult(int requestCode, int resultCode, Intent data) {
if (requestCode == CAPTURE_IMAGE_ACTIVITY_REQUEST_CODE) {
if (resultCode == Activity.RESULT_OK) {
Bitmap bmp = (Bitmap) data.getExtras().get("data");
ByteArrayOutputStream stream = new ByteArrayOutputStream();
bmp.compress(Bitmap.CompressFormat.PNG, 100, stream);
byte[] byteArray = stream.toByteArray();
// convert byte array to Bitmap
Bitmap bitmap = BitmapFactory.decodeByteArray(byteArray, 0,
byteArray.length);
imageView.setImageBitmap(bitmap);
}
}
}
}
对于片段,这是最简单的解决方案:
cameraIamgeView.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Intent cameraIntent=new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
getActivity().startActivityFromFragment(PlaceOrderFragment.this, cameraIntent, CAPTURE_IMAGE_ACTIVITY_REQUEST_CODE);
}
});
@Override
public void onActivityResult(int requestCode, int resultCode, Intent data){
// super.onActivityResult(requestCode, resultCode, data);
try {
if (requestCode == CAPTURE_IMAGE_ACTIVITY_REQUEST_CODE) {
if (resultCode == Activity.RESULT_OK && data != null) {
Bitmap bmp = (Bitmap) data.getExtras().get("data");
ByteArrayOutputStream stream = new ByteArrayOutputStream();
/*
bmp.compress(Bitmap.CompressFormat.PNG, 100, stream);
byte[] byteArray = stream.toByteArray();
// convert byte array to Bitmap
Bitmap bitmap = BitmapFactory.decodeByteArray(byteArray, 0,
byteArray.length);
*/
cameraIamgeView.setImageBitmap(bmp);
}
}
}catch(Exception e){
Toast.makeText(this.getActivity(), e+"Something went wrong", Toast.LENGTH_LONG).show();
}
}
这是最受欢迎的问题之一。我们可以找到很多关于这个问题的线索。但是没有一个对我有用
所以我用这个方法解决了这个问题
让我们首先了解为什么会发生这种情况。
我们可以直接从片段中调用startActivityForResult
,但实际上,所有这些都是由活动处理的。
从片段调用startActivityForResult后,requestCode将被更改为将片段的标识附加到代码中。这将使活动能够在收到结果后跟踪发送此请求的人
一旦活动被导航回,结果将与修改后的requestCode一起发送到活动的onActivityResult,并将其解码为原始requestCode+片段的标识。之后,Activity将通过onActivityResult将活动结果发送到该片段。一切都完成了
问题是:
Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
Fragment frag = this;
/** Pass your fragment reference **/
frag.startActivityForResult(intent, REQUEST_IMAGE_CAPTURE); // REQUEST_IMAGE_CAPTURE = 12345
@Override
public void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
if (resultCode == Activity.RESULT_OK) {
if (requestCode == REQUEST_IMAGE_CAPTURE) {
// Do something with imagePath
Bitmap photo = (Bitmap) data.getExtras().get("data");
imageview.setImageBitmap(photo);
// CALL THIS METHOD TO GET THE URI FROM THE BITMAP
Uri selectedImage = getImageUri(getActivity(), photo);
String realPath=getRealPathFromURI(selectedImage);
selectedImage = Uri.parse(realPath);
}
}
}
活动只能将结果发送到已直接附加到活动的片段,而不能发送到嵌套的片段。这就是为什么嵌套片段的onActivityResult无论如何都不会被调用的原因
解决方案:
1)通过以下代码在片段中启动摄影机意图:
Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
Fragment frag = this;
/** Pass your fragment reference **/
frag.startActivityForResult(intent, REQUEST_IMAGE_CAPTURE); // REQUEST_IMAGE_CAPTURE = 12345
@Override
public void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
if (resultCode == Activity.RESULT_OK) {
if (requestCode == REQUEST_IMAGE_CAPTURE) {
// Do something with imagePath
Bitmap photo = (Bitmap) data.getExtras().get("data");
imageview.setImageBitmap(photo);
// CALL THIS METHOD TO GET THE URI FROM THE BITMAP
Uri selectedImage = getImageUri(getActivity(), photo);
String realPath=getRealPathFromURI(selectedImage);
selectedImage = Uri.parse(realPath);
}
}
}
2)现在在父活动中重写**onActivityResult()
:**
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
}
您必须在父活动中调用此项才能使其正常工作
3)在片段调用中:
Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
Fragment frag = this;
/** Pass your fragment reference **/
frag.startActivityForResult(intent, REQUEST_IMAGE_CAPTURE); // REQUEST_IMAGE_CAPTURE = 12345
@Override
public void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
if (resultCode == Activity.RESULT_OK) {
if (requestCode == REQUEST_IMAGE_CAPTURE) {
// Do something with imagePath
Bitmap photo = (Bitmap) data.getExtras().get("data");
imageview.setImageBitmap(photo);
// CALL THIS METHOD TO GET THE URI FROM THE BITMAP
Uri selectedImage = getImageUri(getActivity(), photo);
String realPath=getRealPathFromURI(selectedImage);
selectedImage = Uri.parse(realPath);
}
}
}
4)获取URI的参考方法:
Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
Fragment frag = this;
/** Pass your fragment reference **/
frag.startActivityForResult(intent, REQUEST_IMAGE_CAPTURE); // REQUEST_IMAGE_CAPTURE = 12345
@Override
public void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
if (resultCode == Activity.RESULT_OK) {
if (requestCode == REQUEST_IMAGE_CAPTURE) {
// Do something with imagePath
Bitmap photo = (Bitmap) data.getExtras().get("data");
imageview.setImageBitmap(photo);
// CALL THIS METHOD TO GET THE URI FROM THE BITMAP
Uri selectedImage = getImageUri(getActivity(), photo);
String realPath=getRealPathFromURI(selectedImage);
selectedImage = Uri.parse(realPath);
}
}
}
->从位图获取Uri的方法
->从Uri获取文件路径的方法
就这样。
有了这个解决方案,它可以应用于任何单个片段,无论它是否嵌套。是的,它也涵盖了所有案例!此外,代码也很好且干净。片段或活动上的onActivityResult是吗?我的onActivityResult没有触发。我把这两种方法都放在我的片段中。还有什么我应该做的吗?onActivityResult是在称为碎片的活动中触发的。这对我有效,正是我想要的!但这只返回缩略图。@user2630955我使用了你的代码,但它没有完全工作。我无法查看从照相机拍摄的图像。你能帮帮我吗,我在这件事上坚持了两天。嘿,伙计,我知道这有点晚了,但对我来说很有效。谢谢!这个答案让我意识到实际上已经覆盖了活动的onActivityResult&并没有调用super。。很棒的酱汁。