我正在尝试在android studio中的片段中访问相机。这些是我写的代码我的片段代码：
package com.example.proje.ui.camera;
import android.hardware.Camera;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.FrameLayout;
import android.widget.TextView;
import androidx.annotation.NonNull;
import androidx.annotation.Nullable;
import androidx.fragment.app.Fragment;
import androidx.lifecycle.Observer;
import androidx.lifecycle.ViewModelProviders;
import com.example.proje.ui.camera.CameraViewModel;
import com.example.proje.R;
public class CameraFragment extends Fragment {
Camera camera;
FrameLayout frameLayout;
ShowCamera showCamera;
@Override
public View onCreateView(@NonNull LayoutInflater inflater,
ViewGroup container, Bundle savedInstanceState) {
View root = inflater.inflate(R.layout.fragment_camera, container, false);
return root;
}
@Override
public void onCreate(@Nullable Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
frameLayout = (FrameLayout)getActivity().findViewById(R.id.frameLayout);
camera = Camera.open();
showCamera = new ShowCamera(getContext(), camera);
frameLayout.addView(showCamera);
}
}
ShowCamera代码：
package com.example.proje.ui.camera;
import android.content.Context;
import android.content.res.Configuration;
import android.hardware.Camera;
import android.view.SurfaceHolder;
import android.view.SurfaceView;
import java.io.IOException;
public class ShowCamera extends SurfaceView implements SurfaceHolder.Callback
{
Camera camera;
SurfaceHolder holder;
public ShowCamera(Context context, Camera camera) {
super(context);
this.camera = camera;
holder = getHolder();
holder.addCallback(this);
}
@Override
public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) {
}
@Override
public void surfaceDestroyed(SurfaceHolder holder) {
}
@Override
public void surfaceCreated(SurfaceHolder holder) {
Camera.Parameters params = camera.getParameters();
if(this.getResources().getConfiguration().orientation != Configuration.ORIENTATION_LANDSCAPE)
{
params.set("orientation", "portrait");
camera.setDisplayOrientation(90);
params.setRotation(90);
}
else
{
params.set("orientation", "landscape");
camera.setDisplayOrientation(0);
params.setRotation(0);
}
camera.setParameters(params);
try
{
camera.setPreviewDisplay(holder);
camera.startPreview();
} catch (IOException e)
{
e.printStackTrace();
}
}
}
我从android清单文件中授予了必要的权限。在android studio中无缝编译但是当我在电话上运行它时，我得到了应用程序停止错误。我怎么解决这个问题。如果您能帮助我，我会很高兴。对不起，我的英语不好。
下面是执行以下操作的简单片段：
似乎您只想按片段打开相机，如果要使用，只使用所需的代码：openCameraIntent（）尝试执行的操作是不可能的（将Camera加载到FrameLayout中）。摄像机应该使用startActivityForResult打开，因为它本身就是一个Activity。
package com.example.proje.ui.camera;
import android.app.Activity;
import android.content.Intent;
import android.content.pm.PackageManager;
import android.graphics.Bitmap;
import android.net.Uri;
import android.os.Build;
import android.os.Bundle;
import android.os.Environment;
import android.provider.MediaStore;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.FrameLayout;
import android.widget.ImageView;
import androidx.annotation.NonNull;
import androidx.annotation.Nullable;
import androidx.core.content.ContextCompat;
import androidx.core.content.FileProvider;
import androidx.fragment.app.Fragment;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Date;
import java.util.List;
import java.util.Locale;
import java.util.Objects;
import static android.Manifest.permission.CAMERA;
public class CameraFragment extends Fragment {
private final int PREFERED_IMAGE_WIDTH_SIZE = 1200;
private final int CAMERA_PERMISSION_CODE = 300;
private final int RESULT_CAMERA_LOAD_IMG = 1889;
private FrameLayout frameLayout;
private ImageView image_view;
private Activity activity;
private List<String> imagesFilesPaths = new ArrayList<>();
@Override
public View onCreateView(@NonNull LayoutInflater inflater,
ViewGroup container, Bundle savedInstanceState) {
View root = inflater.inflate(R.layout.fragment_camera, container, false);
return root;
}
@Override
public void onCreate(@Nullable Bundle savedInstanceState){
super.onCreate(savedInstanceState);
}
@Override
public void onViewCreated(@NonNull View view, @Nullable Bundle savedInstanceState) {
super.onViewCreated(view, savedInstanceState);
activity = getActivity();
image_view = getActivity().findViewById(R.id.image_view);
frameLayout = getActivity().findViewById(R.id.frameLayout);
takePhotoFromCamera();
}
// THIS FUNCTION CAN BE CALLED WHENEVER YOU WANT TO TAKE NEW PHOTO
private void takePhotoFromCamera(){
if (ContextCompat.checkSelfPermission(Objects.requireNonNull(getContext()), CAMERA) != PackageManager.PERMISSION_GRANTED) {
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
requestPermissions(new String[]{CAMERA}, CAMERA_PERMISSION_CODE);
}
} else {
openCameraIntent();
}
}
@Override
public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
if(requestCode == CAMERA_PERMISSION_CODE){
if (permissions.length > 0 && grantResults.length > 0) {
boolean flag = true;
for (int grantResult : grantResults) {
if (grantResult != PackageManager.PERMISSION_GRANTED) {
flag = false;
}
}
if (flag) {
openCameraIntent();
}
}
}else {
super.onRequestPermissionsResult(requestCode, permissions, grantResults);
}
}
private void openCameraIntent(){
Intent cameraIntent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
if(cameraIntent.resolveActivity(Objects.requireNonNull(activity).getPackageManager()) != null){
//Create a file to store the image
File photoFile = null;
try {
photoFile = createImageFile();
} catch (IOException ex) {
// Error occurred while creating the File
}
if (photoFile != null) {
Uri photoURI = FileProvider.getUriForFile(Objects.requireNonNull(getContext()),"com.smartestmedia.camerainfragment.provider", photoFile);
cameraIntent.putExtra(MediaStore.EXTRA_OUTPUT, photoURI);
startActivityForResult(cameraIntent, RESULT_CAMERA_LOAD_IMG);
}
}
}
private File createImageFile() throws IOException {
String timeStamp = new SimpleDateFormat("yyyyMMdd_HHmmss", Locale.ENGLISH).format(new Date());
String imageFileName = "IMG_" + timeStamp + "_";
File storageDir = activity.getExternalFilesDir(Environment.DIRECTORY_PICTURES);
File image = File.createTempFile(
imageFileName, /* prefix */
".jpg", /* suffix */
storageDir /* directory */
);
imagesFilesPaths.add(image.getAbsolutePath());
return image;
}
@Override
public void onActivityResult(int requestCode, int resultCode, Intent data) {
if (requestCode == RESULT_CAMERA_LOAD_IMG && resultCode == Activity.RESULT_OK){
String tempImageFilePath = imagesFilesPaths.get(imagesFilesPaths.size()-1);
Uri tempImageURI = Uri.fromFile(new File( tempImageFilePath ));
resizeThanLoadImage(tempImageFilePath, tempImageURI);
}
}
private void resizeThanLoadImage(String tempImageFilePath, Uri tempImageURI){
Bitmap bitmap = null;
try {
bitmap = MediaStore.Images.Media.getBitmap(Objects.requireNonNull(activity).getContentResolver(), tempImageURI);
} catch (IOException e) {
e.printStackTrace();
}
if(bitmap == null)return;
int sizeDivisor = 1;
double imageSize = bitmap.getWidth();
if(bitmap.getHeight() > bitmap.getWidth())imageSize = bitmap.getHeight();
sizeDivisor = round(imageSize / PREFERED_IMAGE_WIDTH_SIZE);
if(sizeDivisor == 0)sizeDivisor = 1;
Bitmap bitmapScaled = Bitmap.createScaledBitmap(bitmap, (bitmap.getWidth()/sizeDivisor), (bitmap.getHeight()/sizeDivisor), true);
storeBitmapInFile(bitmapScaled, tempImageFilePath);
onImageLoaded(tempImageURI);
}
private int round(double d){
double dAbs = Math.abs(d);
int i = (int) dAbs;
double result = dAbs - (double) i;
if(result<0.5){
return d<0 ? -i : i;
}else{
return d<0 ? -(i+1) : i+1;
}
}
private void storeBitmapInFile(Bitmap image, String filePath) {
File pictureFile = new File(filePath);
String TAG = "TakePhotosFragment>>>> ";
try {
FileOutputStream fos = new FileOutputStream(pictureFile);
image.compress(Bitmap.CompressFormat.JPEG, 80, fos);
fos.close();
} catch (FileNotFoundException e) {
Log.d(TAG, "File not found: " + e.getMessage());
} catch (IOException e) {
Log.d(TAG, "Error accessing file: " + e.getMessage());
}
}
private void onImageLoaded(Uri imageUri) {
// LOAD YOUR IMAGE in imageview
image_view.setImageURI(imageUri);
}
}
祝你好运！