Android开发学习—调用摄像头权限拍照

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用户11043112

发布于 2024-03-25 16:49:44

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代码可运行

文章被收录于专栏：学习

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代码可运行

演示视频

一，准备

android apk的安装，本文用的自带模版是Bottom Navigation Activity，android api 30

二，添加必要的权限

在AndroidManifest.xml文件中添加相机权限，与</application>标签同级

    <uses-permission android:name="android.permission.CAMERA" />
    <uses-feature android:name="android.hardware.camera" />
    <uses-feature android:name="android.hardware.camera.autofocus" />

三，在xml文件中添加必要的组件

这里用了一个Button和ImageView组件

四，按钮触发器

写在onCreateView函数下面

        //按钮触发器
        Button button = binding.buttonContinue;
        button.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                // 在这里处理点击事件
                requestCameraPermission();
            }
        });
        return root;

五，处理运行时权限

// 请求相机权限
    private void requestCameraPermission() {
        if (ContextCompat.checkSelfPermission(getActivity(), Manifest.permission.CAMERA)
                != PackageManager.PERMISSION_GRANTED) {
            ActivityCompat.requestPermissions(getActivity(), new String[]{Manifest.permission.CAMERA}, PERMISSIONS_REQUEST_CAMERA);

        } else {
            takePhoto();
        }
    }

    @Override
    public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
        super.onRequestPermissionsResult(requestCode, permissions, grantResults);
        if (requestCode == PERMISSIONS_REQUEST_CAMERA) {
            if (grantResults.length > 0 && grantResults[0] == PackageManager.PERMISSION_GRANTED) {
                // 权限被授予，执行拍照操作
                takePhoto();
            } else {
                // 权限被拒绝
                Toast.makeText(getContext(), "Camera permission is required to take a photo.", Toast.LENGTH_SHORT).show();
            }
        }
    }

六，实现拍照功能

// 启动相机并拍照
    private void takePhoto() {
        Intent takePictureIntent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
        if (takePictureIntent.resolveActivity(getActivity().getPackageManager()) != null) {
            startActivityForResult(takePictureIntent, REQUEST_TAKE_PHOTO);
        }
    }

七，处理拍照结果

@Override
    public void onActivityResult(int requestCode, int resultCode, Intent data) {
        super.onActivityResult(requestCode, resultCode, data);
        if (requestCode == REQUEST_TAKE_PHOTO) {
            if (resultCode == Activity.RESULT_OK) {
                Bundle extras = data.getExtras();
                if (extras != null && extras.containsKey("data")) {
                    Bitmap imageBitmap = (Bitmap) extras.get("data");
                    // 将Bitmap显示在ImageView中
                    binding.imageViewCamera.setImageBitmap(imageBitmap);
                } else {
                    // 获取照片的URI
                    Uri photoUri = data.getData();
                    if (photoUri != null) {
                        // 显示图片
                        binding.imageViewCamera.setImageURI(photoUri);
                    } else {
                        Log.e("HomeFragment", "Photo URI is null, cannot display image.");
                    }
                }
            } else if (resultCode == Activity.RESULT_CANCELED) {
                // 用户取消了拍照
                Log.i("HomeFragment", "User cancelled the photo capture.");
            } else {
                // 其他错误处理
                Log.e("HomeFragment", "Unexpected result code: " + resultCode);
            }
        }
    }