android中关于相机资源的使用

调用相机资源必须加上相机权限

如何动态申请相机权限请看这里

private static final int REQUEST_CODE_ALBUM = 100;//打开相册
private static final int REQUEST_CODE_CAMERA = 101;//打开相机
private Uri photoUri;   //相机拍照返回图片路径
private File outputImage;

new AlertDialog.Builder(getContext())
                        .setTitle("请选择注册方式")
                        .setIcon(android.R.drawable.ic_dialog_info)
                        .setItems(new String[]{"打开图片", "拍摄照片"}, new DialogInterface.OnClickListener() {
                            @Override
                            public void onClick(DialogInterface dialog, int which) {
                                switch (which){
                                    case 1:
                                        //取消严格模式  FileProvider
                                        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.N) {
                                            StrictMode.VmPolicy.Builder builder = new StrictMode.VmPolicy.Builder();
                                            StrictMode.setVmPolicy( builder.build() );
                                        }
                                        //创建file对象，用于存储拍照后的图片，这也是拍照成功后的照片路径
                                        outputImage = new File(getActivity().getExternalCacheDir(),System.currentTimeMillis()+".jpg");
                                        try {
                                            //判断文件是否存在，存在删除，不存在创建
                                            if (outputImage.exists()){
                                                outputImage.delete();
                                            }
                                            outputImage.createNewFile();
                                        } catch (IOException e) {
                                            e.printStackTrace();
                                        }
                                        photoUri = Uri.fromFile(outputImage);
                                        Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
                                        intent.putExtra(MediaStore.EXTRA_OUTPUT,photoUri);
                                        startActivityForResult(intent, REQUEST_CODE_CAMERA);
                                        break;
                                    case 0:
                                        Intent getImageByalbum = new Intent(Intent.ACTION_GET_CONTENT);  //允许选择资源，并返回
                                        getImageByalbum.addCategory(Intent.CATEGORY_OPENABLE);
                                        getImageByalbum.setType("image/jpeg");
                                        startActivityForResult(getImageByalbum, REQUEST_CODE_ALBUM);
                                        break;
                                    default:;
                                }
                            }
                        })
                        .show();

/*相机调用的回调函数，调用结束后可以在该函数中进行处理*/
    @Override
    public void onActivityResult(int requestCode, int resultCode, Intent data) {
        super.onActivityResult(requestCode, resultCode, data);
        if(requestCode == REQUEST_CODE_ALBUM && resultCode == getActivity().RESULT_OK){
            if (data != null) {
                // 照片的原始资源地址
                photoUri = data.getData();
                String path = photoUri.getPath();
                ContentResolver cr = getContext().getContentResolver();
                try {
                    Bitmap bitmap = BitmapFactory.decodeStream(cr.openInputStream(photoUri));
                    // 取得想要缩放的matrix参数
                    Matrix matrix = new Matrix();
                    matrix.postScale(0.25f, 0.25f);
                    Bitmap bitmap1 = Bitmap.createBitmap(bitmap,0,0,bitmap.getWidth(),bitmap.getHeight(),matrix,true);
                    /* 将Bitmap设定到ImageView */
                    imageView.setImageBitmap(bitmap1);
                } catch (FileNotFoundException e) {
                    Log.e("Exception", e.getMessage(), e);
                }
            }
        }else if(requestCode == REQUEST_CODE_CAMERA && resultCode == getActivity().RESULT_OK){
            //这就是拍照成功后的图片的路径，因为刚开始我们创建了这个图片的路径
            photoUri= Uri.fromFile(outputImage);
            //也可以转换成Bitmap
            try {
                Bitmap bitmap = BitmapFactory.decodeStream(getActivity().getContentResolver().openInputStream(photoUri));
                // 取得想要缩放的matrix参数
                Matrix matrix = new Matrix();
                matrix.postScale(0.25f, 0.25f);
                Bitmap bitmap1 = Bitmap.createBitmap(bitmap,0,0,bitmap.getWidth(),bitmap.getHeight(),matrix,true);
                imageView.setImageBitmap(bitmap1);
                imageView.setBackground(null);
            } catch (FileNotFoundException e) {
                e.printStackTrace();
            }
        }
    }