Android7.0 拍照 选择照片 权限 实现

参考链接：

http://blog.csdn.net/hu5080126/article/details/53738625

http://www.jianshu.com/p/ba57444a7e69

在Android7.0以后，当app使用file:// url 共享给其他app时， 会抛出异常。

因为在android 6.0 + 权限需要 在运行时候检查， 其他app 可能没有读写文件的权限， 所以google在7.0的时候加上了这个限制。

官方推荐使用 FileProvider 解决这个问题。 

1.打开相机拍照获取照片Uri，然后对图片进行压缩

2.打开相册获取选取的图片Uri，然后对图片进行压缩

打开相机和相册是不会触发任何权限问题的，如果你想获取相机或相册的图片中的Uri，即file://URI开头的Uri离开了相机或相册应用，就会触发7.0文件uri权限 FileUriExposedException，会触发FileUriExposedException权限异常。

现在将代码贴下来：

private static final int NEED_CAMERA = 200;private static final int RESULT_PICK = 201;

/** * 从TakePhotoPopWin获取的onClickListener * 点击PopuWindow上的照相或者从相册中选取图片 功能1 */private View.OnClickListener onClickListener = new View.OnClickListener() {    @Override    public void onClick(View v) {        switch (v.getId()) {            //照相            case R.id.btn_take_photo:                //检测是否有相机和读写文件权限                if (ContextCompat.checkSelfPermission(UIUtils.getContext(), Manifest.permission.CAMERA)                        != PackageManager.PERMISSION_GRANTED                        || ContextCompat.checkSelfPermission(UIUtils.getContext(), Manifest.permission.WRITE_EXTERNAL_STORAGE)                        != PackageManager.PERMISSION_GRANTED) {                    getActivity().requestPermissions(new String[]{Manifest.permission.CAMERA, Manifest.permission.WRITE_EXTERNAL_STORAGE}, NEED_CAMERA);                } else {                    //打开相机获取图片                    startCamera();                }                break;            //从相册选择图片            case R.id.btn_pick_photo:                if (ContextCompat.checkSelfPermission(UIUtils.getContext(), Manifest.permission.READ_EXTERNAL_STORAGE)                        != PackageManager.PERMISSION_GRANTED) {                    getActivity().requestPermissions(new String[]{Manifest.permission.CAMERA, Manifest.permission.WRITE_EXTERNAL_STORAGE}, RESULT_PICK);                } else {                    //选择图片                    startPickPhoto();                }                break;        }    }};

/** * date: 2017/7/5 10:59 * autour: HelenChen * description: 选择图片*/ private void startPickPhoto() {     Intent intent = new Intent(Intent.ACTION_PICK, MediaStore.Images.Media.EXTERNAL_CONTENT_URI);     startActivityForResult(Intent.createChooser(intent, "请选择图片"), RESULT_PICK);     takePhotoPopWin.hiddPop(); }

/** * 打开相机获取图片 */private void startCamera() {    File imagePath = new File(Environment.getExternalStorageDirectory(), "images");    if (!imagePath.exists()) imagePath.mkdirs();    newFile = new File(imagePath, "point_image.jpg");    //第二参数是在manifest.xml定义 provider的authorities属性    contentUri = FileProvider.getUriForFile(UIUtils.getContext(), "com.example.administrator.im_demo.fileprovider", newFile);    Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);    //兼容版本处理，因为 intent.addFlags(Intent.FLAG_GRANT_WRITE_URI_PERMISSION) 只在5.0以上的版本有效    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {        intent.addFlags(Intent.FLAG_GRANT_WRITE_URI_PERMISSION);    } else if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN) {        ClipData clip = ClipData.newUri(getActivity().getContentResolver(), "A photo", contentUri);        intent.setClipData(clip);        intent.addFlags(Intent.FLAG_GRANT_WRITE_URI_PERMISSION);    } else {        List<ResolveInfo> resInfoList = getActivity().getPackageManager().queryIntentActivities(intent, PackageManager.MATCH_DEFAULT_ONLY);        for (ResolveInfo resolveInfo : resInfoList) {            String packageName = resolveInfo.activityInfo.packageName;            getActivity().grantUriPermission(packageName, contentUri, Intent.FLAG_GRANT_WRITE_URI_PERMISSION);        }    }    intent.putExtra(MediaStore.EXTRA_OUTPUT, contentUri);    startActivityForResult(intent, NEED_CAMERA);    takePhotoPopWin.hiddPop();}

@Overridepublic void onRequestPermissionsResult(int requestCode, String[] permissions,                                       int[] grantResults) {    switch (requestCode) {        case NEED_CAMERA:            // 如果权限被拒绝，grantResults 为空            if (grantResults.length > 0                    && grantResults[0] == PackageManager.PERMISSION_GRANTED) {                //打开相机获取图片                startCamera();            } else {                Toast.makeText(UIUtils.getContext(), "需要相机和读写文件权限", Toast.LENGTH_SHORT).show();            }            break;        case RESULT_PICK:            // 如果权限被拒绝，grantResults 为空            if (grantResults.length > 0                    && grantResults[0] == PackageManager.PERMISSION_GRANTED) {                //选择图片                startPickPhoto();            } else {                Toast.makeText(UIUtils.getContext(), "需要读取权限", Toast.LENGTH_SHORT).show();            }            break;    }}

@Overridepublic void onActivityResult(int requestCode, int resultCode, Intent data) {    switch (requestCode) {        case NEED_CAMERA:            ContentResolver contentProvider = getActivity().getContentResolver();            ParcelFileDescriptor mInputPFD;            try {                //获取contentProvider图片                mInputPFD = contentProvider.openFileDescriptor(contentUri, "r");                FileDescriptor fileDescriptor = mInputPFD.getFileDescriptor();                iv_company_bk.setImageBitmap(BitmapFactory.decodeFileDescriptor(fileDescriptor));            } catch (FileNotFoundException e) {                e.printStackTrace();            }            break;        //选择照片        case RESULT_PICK:            try {                Uri uri = data.getData();                //打开圆形裁剪图界面                String path = Utils.getRealFilePathFromUri(getActivity().getApplicationContext(), uri);                Bitmap bitmaps = BitmapUtil.decodeSampledBitmap(path, 720, 1280);                iv_company_bk.setImageBitmap(bitmaps);                /**                 * 请求网络，将图片上传到服务器                 */                //upLoadImg(path);            }catch (Exception e){                e.printStackTrace();            }            break;    }}