public void takePic(){

        //创建File对象，用于存储拍照后的照片

        File outputImage = new File(getExternalCacheDir(),"output_image.jpg");

        try {

            if (outputImage.exists()){

                outputImage.delete();

            }

            outputImage.createNewFile();

        }catch (IOException e){

            e.printStackTrace();

        }

        if (Build.VERSION.SDK_INT >= 24){

            imageUri = FileProvider.getUriForFile(AddNewActivity.this,"com.example.cameraalbumtest.fileprovider",outputImage);

        }else {

            imageUri = Uri.fromFile(outputImage);

        }

        //启动相机程序

        Intent intent = new Intent("android.media.action.IMAGE_CAPTURE");

        intent.putExtra(MediaStore.EXTRA_OUTPUT,imageUri);

        startActivityForResult(intent,TAKE_PHOTO);

    }

 <provider

            android:name="android.support.v4.content.FileProvider"

            android:authorities="com.example.cameraalbumtest.fileprovider"

            android:exported="false"

            android:grantUriPermissions="true">

            <meta-data

                android:name="android.support.FILE_PROVIDER_PATHS"

                android:resource="@xml/file_paths" />

        </provider>

<paths>

    <external-path name="takpic_img_path" path="Pics"/>

</paths>