Android拍照和从相册获取照片

1.从相册获取照片

   private void openAlumb() {

//mRxPermissions:三方权限库
        mRxPermissions
                .request(Manifest.permission.WRITE_EXTERNAL_STORAGE)
                .subscribe(granted -> {
                    if (granted) { // Always true pre-M
                        Intent intentToPickPic = new Intent(Intent.ACTION_GET_CONTENT, null);
                        // 如果限制上传到服务器的图片类型时可以直接写如："image/jpeg 、 image/png等的类型" 所有类型则写 "image/*"
                        intentToPickPic.setDataAndType(MediaStore.Images.Media.EXTERNAL_CONTENT_URI, "image/*");

                        /*是否有能处理的外部activity*/
                        if (intentToPickPic.resolveActivity(getPackageManager()) != null) {

                            startActivityForResult(intentToPickPic, REQUEST_ALUBM);
                        }
                    } else {

                    }
                });


    }

2.拍照

private void takePhoto() {

        mRxPermissions.requestEach(Manifest.permission.WRITE_EXTERNAL_STORAGE).subscribe(permisssion -> {
            if (permisssion.granted) {
                if (getPackageManager().hasSystemFeature(PackageManager.FEATURE_CAMERA_ANY)) {//手机是否有探头
                    Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
                    /*是否有能处理的外部activity*/
                    if (intent.resolveActivity(getPackageManager()) != null) {

                        try {
                            File photoFile = creatImageFile();

                            Uri photoUri = FileProvider.getUriForFile(UserInfoActivity.this,
                                    "com.ore.jalon.trace.fileprovider", photoFile);

                            intent.putExtra(MediaStore.EXTRA_OUTPUT, photoUri);


                        } catch (IOException e) {
                            e.printStackTrace();
                        }


                        startActivityForResult(intent, REQUEST_TAKE_PHOTO);
                    }

                }
            } else if (permisssion.shouldShowRequestPermissionRationale) {//拒绝了并且勾选了不再提示

            } else {

            }
        });
        
    }

 private File creatImageFile() throws IOException {
        /*判断是否有外存*/
        if (Environment.getExternalStorageState().equals(MEDIA_UNMOUNTED)) {

            return null;
        }

        String timeStamp = new SimpleDateFormat("yyyy_MMddmmss").format(new Date());
        String imgFileName = "JPEG_" + timeStamp + "_";

        /*保存到相册   */
        File fileDirct = Environment.getExternalStoragePublicDirectory(DIRECTORY_DCIM);

        File imgFile = File.createTempFile(imgFileName, ".jpg", fileDirct);

        mCurrentPhotoPath = imgFile.getAbsolutePath();
        return imgFile;
    }

2.fileprovider: Android7.0开始 file://Uri 不给用，那么换个 Uri 为 content:// 来替代。

FileProvider使用

现在xml文件中申明

     <provider
            android:name="android.support.v4.content.FileProvider"
//authorities:自定义，其他的固定
            android:authorities="com.package.fileprovider"
            android:exported="false"
            android:grantUriPermissions="true">
            <meta-data
                android:name="android.support.FILE_PROVIDER_PATHS"
//指定路径文件
                android:resource="@xml/file_paths"></meta-data>
        </provider>

新建XML文件夹新建path.xml

<paths xmlns:android="http://schemas.android.com/apk/res/android">
    <!--system 相册 path:如果使用私有存储的话自定义一个文件路径比如/pigphoto-->
    <external-path name="my_images" path="DCIM" />
</paths>

最后在处理获取到的照片uri

  protected void onActivityResult(int requestCode, int resultCode, Intent data) {

        if (requestCode == REQUEST_TAKE_PHOTO && resultCode == RESULT_OK) {

//通过三方的缩放裁切一下图片
            startPhotoZoom(Uri.fromFile(new File(mCurrentPhotoPath)));
 

        }
        if (requestCode == REQUEST_ALUBM && resultCode == RESULT_OK) {
      
            Uri uri = data.getData();
            startPhotoZoom(uri);

        }
        if (requestCode == UCrop.REQUEST_CROP && resultCode == RESULT_OK) {
//获取裁切后的图片
            final Uri resultUri = UCrop.getOutput(data);
 
        }
    }
  public void startPhotoZoom(Uri uri) {
        LogUtil.d(this.toString(), "begin cut");
        try {
            File file = creatImageFile();
            UCrop.Options options = new UCrop.Options();
            options.setHideBottomControls(true);
            UCrop.of(uri, Uri.fromFile(file))
                    .withAspectRatio(1, 1)
                    .withMaxResultSize(200, 200).withOptions(options)
                    .start(this);
        } catch (IOException e) {
            e.printStackTrace();
        }

    }