在android11手機(jī)上，當(dāng)APP重新安裝后，無(wú)法刪除之前在APP上保存的圖片，是因?yàn)闆](méi)有app沒(méi)有修改這張圖片的權(quán)限，所以需要重新手動(dòng)申請(qǐng)權(quán)限，先上圖：

功能代碼實(shí)現(xiàn)：
1、創(chuàng)建一個(gè)fragment，用于處理fragment 的回調(diào)信息。如果是activity的話，直接在 onActivityResult處理就可以了

class ActivityResultFragment : Fragment() {private var onActivityResultListener: ActivityResultListener? = nulloverride fun onCreate(@Nullable savedInstanceState: Bundle?) {super.onCreate(savedInstanceState)onActivityResultListener!!.onRequest(this)}override fun onActivityResult(requestCode: Int, resultCode: Int, @Nullable data: Intent?) {super.onActivityResult(requestCode, resultCode, data)onActivityResultListener!!.onActivityResult(requestCode, resultCode, data)if (activity != null) {val transaction: FragmentTransaction =requireActivity().supportFragmentManager.beginTransaction()transaction.remove(this)transaction.commit()}}interface ActivityResultListener {fun onRequest(fragment: ActivityResultFragment?)fun onActivityResult(requestCode: Int, resultCode: Int, @Nullable data: Intent?)}companion object {private const val TAG = "ActivityResultFragment"fun registerActivityResult(activity: FragmentActivity,@NonNull listener: ActivityResultListener) {val transaction: FragmentTransaction =activity.supportFragmentManager.beginTransaction()var fragment =activity.supportFragmentManager.findFragmentByTag(TAG) as? ActivityResultFragmentif (fragment == null) {fragment = ActivityResultFragment()}fragment.onActivityResultListener = listenerif (fragment.isAdded) {listener.onRequest(fragment)} else {transaction.add(fragment, TAG)}transaction.commit()}} }interface FileUtilCallback {fun onResult(success: Boolean) }

2、創(chuàng)建刪除文件的工具類(lèi)

object ImageUtil {/*** 刪除文件* @return*/fun deleteFileUri(activity: FragmentActivity, imgPath: String, callBack: FileUtilCallback) {val cursor: Cursor = MediaStore.Images.Media.query(activity.contentResolver,MediaStore.Images.Media.EXTERNAL_CONTENT_URI,arrayOf<String>(MediaStore.Images.Media._ID),MediaStore.Images.Media.DATA.toString() + "=?",arrayOf(imgPath),null)try {if (cursor.moveToFirst()) {val id: Long = cursor.getLong(0)val contentUri: Uri = MediaStore.Images.Media.EXTERNAL_CONTENT_URIval uri: Uri = ContentUris.withAppendedId(contentUri, id)val count: Int = activity.contentResolver.delete(uri, null, null)if (count > 0) {callBack.onResult(true)} else {callBack.onResult(false)}} else {val isSuccess = File(imgPath).delete()if (isSuccess) {callBack.onResult(true)} else {callBack.onResult(false)}}} catch (e: java.lang.Exception) {e.printStackTrace()if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.Q && e is RecoverableSecurityException) {val DELETE_REQUEST_CODE = 1001ActivityResultFragment.registerActivityResult(activity,object : ActivityResultFragment.ActivityResultListener {override fun onRequest(fragment: ActivityResultFragment?) {try {fragment!!.startIntentSenderForResult(e.userAction.actionIntent.intentSender,DELETE_REQUEST_CODE,null,0, 0, 0, null)} catch (sendIntentException: IntentSender.SendIntentException) {sendIntentException.printStackTrace()callBack.onResult(false)}}override fun onActivityResult(requestCode: Int,resultCode: Int,@Nullable data: Intent?) {if (requestCode == DELETE_REQUEST_CODE && resultCode == Activity.RESULT_OK) {deleteFileUri(activity, imgPath, callBack)} else {callBack.onResult(false)}}})} else {callBack.onResult(false)}}}}

3、在界面中設(shè)置一個(gè)點(diǎn)擊事件，實(shí)現(xiàn)刪除圖片功能的調(diào)用

R.id.delteimage -> {ImageUtil.deleteFileUri(requireActivity(),imagePath, //圖片路徑object : FileUtilCallback {override fun onResult(success: Boolean) {if (success) {ToastUtils.showBottom("刪除成功")goSelectPhoto() //更新列表} else {ToastUtils.showBottom("刪除失敗，請(qǐng)手動(dòng)刪除")}}}) }

現(xiàn)在就可以實(shí)現(xiàn)在fragment里面 實(shí)現(xiàn)刪除文件功能，在獲取權(quán)限后自動(dòng)刪除該文件了

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