Android开发之在Fragment和Activity页面拍照需要注意的地方

先贴出Google官方文档：Google官方拍照文档

感觉讲的不是很细，有不少坑。

先看需要配置权限和provider

  <!--拍照存储权限--><uses-permissionandroid:name="android.permission.WRITE_EXTERNAL_STORAGE"tools:ignore="ScopedStorage" /><!--拍照权限--><uses-permission android:name="android.permission.CAMERA" />

 <!--拍照需要配置provider为了兼容Android 7.0 下面的authorities里面的值需要和拍照里面的provider一样，下面这段代码Uri photoUri = FileProvider.getUriForFile(activity, activity.getPackageName() + ".xiayiye5", photoFile);--><providerandroid:name="androidx.core.content.FileProvider"android:authorities="${applicationId}.xiayiye5"android:exported="false"android:grantUriPermissions="true"><meta-dataandroid:name="android.support.FILE_PROVIDER_PATHS"android:resource="@xml/file_paths"></meta-data></provider>

再看下file_path文件如何写的

<?xml version="1.0" encoding="utf-8"?>
<paths><!--    配置拍照图片存储路径为: 包名/files/Pictures--><external-pathname="my_images"path="Android/data/cn.xiayiye5.xiayiye5library/files/Pictures" />
</paths>

当然还有一个万能路径写法待研究：感谢此博主：万能路径写法

<paths xmlns:android="http://schemas.android.com/apk/res/android"><external-pathname="external"path="." /><external-files-pathname="external_files"path="." /><cache-pathname="cache"path="." /><external-cache-pathname="external_cache"path="." /><files-pathname="files"path="." />
</paths>
————————————————
版权声明：本文为CSDN博主「Huc_Boy」的原创文章，遵循CC 4.0 BY-SA版权协议，转载请附上原文出处链接及本声明。
原文链接：https://blog.csdn.net/liu_xueping/article/details/103980700

好了activity页面开始拍照了

public void dispatchTakePictureIntent(Activity activity) {if (PackageManager.PERMISSION_GRANTED == ContextCompat.checkSelfPermission(activity, android.Manifest.permission.CAMERA)) {//拍照方法Intent takePictureIntent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);if (takePictureIntent.resolveActivity(activity.getPackageManager()) != null) {File photoFile = null;try {photoFile = createImageFile(activity);} catch (IOException ex) {ex.printStackTrace();}if (photoFile != null) {Uri photoUri = FileProvider.getUriForFile(activity, activity.getPackageName() + ".xiayiye5", photoFile);takePictureIntent.putExtra(MediaStore.EXTRA_OUTPUT, photoUri);activity.startActivityForResult(takePictureIntent, TakePhotoActivity.REQUEST_IMAGE_CAPTURE);}}} else {//提示用户开户权限   拍照和读写sd卡权限String[] perms = {Manifest.permission.READ_EXTERNAL_STORAGE, Manifest.permission.WRITE_EXTERNAL_STORAGE, Manifest.permission.CAMERA};ActivityCompat.requestPermissions(activity, perms, 10010);}}

再看下activity页面回调

 @Overrideprotected void onActivityResult(int requestCode, int resultCode, Intent data) {super.onActivityResult(requestCode, resultCode, data);if (requestCode == REQUEST_IMAGE_CAPTURE && resultCode == RESULT_OK) {//拍照后的图片回调DisplayMetrics dm = new DisplayMetrics();getWindowManager().getDefaultDisplay().getMetrics(dm);int screenWidth = dm.widthPixels;Bitmap decodeFile = BitmapFactory.decodeFile(TakePhotoUtils.getInstance().getImgPath());int width = decodeFile.getWidth();int size = width / screenWidth;BitmapFactory.Options newOpts = new BitmapFactory.Options();newOpts.inJustDecodeBounds = false;//设置缩放比例newOpts.inSampleSize = size * 2;Log.e("打印缩放比例", size + "");//重新读入图片，注意此时已经把options.inJustDecodeBounds 设回false了Bitmap bitmap = BitmapFactory.decodeFile(TakePhotoUtils.getInstance().getImgPath(), newOpts);ivTakePhoto.setImageBitmap(bitmap);}}@Overridepublic void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {if (requestCode == 10010) {boolean cameraAccepted = grantResults[0] == PackageManager.PERMISSION_GRANTED;if (cameraAccepted) {//权限申请成功Toast.makeText(this, "activity页面权限申请成功！", Toast.LENGTH_LONG).show();// 调用拍照方法TakePhotoUtils.getInstance().dispatchTakePictureIntent(this);} else {//用户授权拒绝之后，友情提示一下就可以了Toast.makeText(this, "activity页面请开启应用拍照权限！", Toast.LENGTH_LONG).show();}}super.onRequestPermissionsResult(requestCode, permissions, grantResults);}

再看下在fragment中拍照只需要注意两点

看下在fragment中拍照的方法

public void dispatchTakePictureIntent(Fragment fragment) {if (PackageManager.PERMISSION_GRANTED == ContextCompat.checkSelfPermission(fragment.getContext(), android.Manifest.permission.CAMERA)) {//拍照方法Intent takePictureIntent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);if (takePictureIntent.resolveActivity(fragment.requireActivity().getPackageManager()) != null) {File photoFile = null;try {photoFile = createImageFile(fragment.requireActivity());} catch (IOException ex) {ex.printStackTrace();}if (photoFile != null) {Uri photoUri = FileProvider.getUriForFile(fragment.requireActivity(), fragment.requireActivity().getPackageName() + ".xiayiye5", photoFile);takePictureIntent.putExtra(MediaStore.EXTRA_OUTPUT, photoUri);//在fragment页面拍照需要使用fragment中的startActivityForResult，不然不会走fragment中的回调fragment.startActivityForResult(takePictureIntent, TakePhotoActivity.REQUEST_IMAGE_CAPTURE);}}} else {//提示用户开户权限   拍照和读写sd卡权限String[] perms = {Manifest.permission.READ_EXTERNAL_STORAGE, Manifest.permission.WRITE_EXTERNAL_STORAGE, Manifest.permission.CAMERA};//在fragment中申请权限时候需要使用fragment中的requestPermissions方法不然不会走fragment中的回调fragment.requestPermissions(perms, 10010);}}

再看下在fragment中的回调

 @Overridepublic void onActivityResult(int requestCode, int resultCode, @Nullable Intent data) {
//        super.onActivityResult(requestCode, resultCode, data);if (requestCode == TakePhotoActivity.REQUEST_IMAGE_CAPTURE && resultCode == RESULT_OK) {//在fragment中拍照后的回调DisplayMetrics dm = new DisplayMetrics();requireActivity().getWindowManager().getDefaultDisplay().getMetrics(dm);int screenWidth = dm.widthPixels;Bitmap decodeFile = BitmapFactory.decodeFile(TakePhotoUtils.getInstance().getImgPath());int width = decodeFile.getWidth();int size = width / screenWidth;BitmapFactory.Options newOpts = new BitmapFactory.Options();newOpts.inJustDecodeBounds = false;//设置缩放比例newOpts.inSampleSize = size * 2;Log.e("打印缩放比例", size + "");//重新读入图片，注意此时已经把options.inJustDecodeBounds 设回false了Bitmap bitmap = BitmapFactory.decodeFile(TakePhotoUtils.getInstance().getImgPath(), newOpts);ivTakePhoto.setImageBitmap(bitmap);}}@Overridepublic void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {//在fragment中申请权限后的回调if (requestCode == 10010) {boolean cameraAccepted = grantResults[0] == PackageManager.PERMISSION_GRANTED;if (cameraAccepted) {//权限申请成功Toast.makeText(requireActivity(), "fragment页面权限申请成功！", Toast.LENGTH_LONG).show();// 调用拍照方法TakePhotoUtils.getInstance().dispatchTakePictureIntent(this);} else {//用户授权拒绝之后，友情提示一下就可以了Toast.makeText(requireActivity(), "fragment页面请开启应用拍照权限！", Toast.LENGTH_LONG).show();}}super.onRequestPermissionsResult(requestCode, permissions, grantResults);}

Activity拍照源码:activity拍照

Fragment拍照源码：fragment拍照

拍照工具类源码：拍照工具类

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