打开系统相机拍照并保存

    public void takePhoto() {
        Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
        intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);

        try {
            File file = Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_DCIM + "/Camera/" + System.currentTimeMillis() + ".jpg");
            int currentapiVersion = Build.VERSION.SDK_INT;

            if (currentapiVersion < 24) {
                intent.putExtra(MediaStore.EXTRA_OUTPUT, Uri.fromFile(file));
            } else {
                ContentValues contentValues = new ContentValues(1);
                contentValues.put(MediaStore.Images.Media.DATA, file.getAbsolutePath());
                Uri uri = context.getContentResolver().insert(MediaStore.Images.Media.EXTERNAL_CONTENT_URI, contentValues);
                intent.putExtra(MediaStore.EXTRA_OUTPUT, uri);
            }
        } catch (Exception e) {
            e.printStackTrace();
        }

        context.startActivity(intent);
    }

打开手机中的相机应用

        PackageManager packageManager = getPackageManager();
        //查看系统中是否有可用的相机应用
        List<ResolveInfo> resolveInfoList = packageManager.queryIntentActivities(new Intent(MediaStore.ACTION_IMAGE_CAPTURE), PackageManager.MATCH_DEFAULT_ONLY);

        if (resolveInfoList != null && resolveInfoList.size() > 0) {
            ResolveInfo resolveInfo = resolveInfoList.get(0);
            String packageName = resolveInfo.activityInfo.packageName;
            String name1 = resolveInfo.activityInfo.name;
            try {
                //打开相机
                Intent intent = getPackageManager().getLaunchIntentForPackage(packageName);
                if (intent == null) {
                    intent = new Intent(Intent.ACTION_MAIN);
                    intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK | Intent.FLAG_ACTIVITY_RESET_TASK_IF_NEEDED);
                    intent.setPackage(packageName);
                    intent.addCategory(Intent.CATEGORY_LAUNCHER);
                    ComponentName name = new ComponentName(packageName, name1);
                    intent.setComponent(name);
                }
                startActivity(intent);
            } catch (Exception e) {
                e.printStackTrace();
            }

        }