Android 10适配要点，作用域存储
先申请权限
1 private void grantPermission() { 2 // 使用Environment.isExternalStorageLegacy()来检查APP的运行模式 3 if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.Q && 4 !Environment.isExternalStorageLegacy()) { 5 System.out.println("btnCreate = isExternalStorageLegacy : " + Environment.isExternalStorageLegacy()); 6 } 7 if (ActivityCompat.checkSelfPermission(MainActivity.this, Manifest.permission.WRITE_EXTERNAL_STORAGE) != PackageManager.PERMISSION_GRANTED) { 8 ActivityCompat.requestPermissions(MainActivity.this, new String[]{Manifest.permission.WRITE_EXTERNAL_STORAGE}, 9 REQUEST_PERMISSION); 10 Log.d(TAG, "grantPermission: 权限说明提示"); 11 } else { 12 if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) { 13 Log.d(TAG, "grantPermission: requestPermissions"); 14 requestPermissions(new String[]{Manifest.permission.WRITE_EXTERNAL_STORAGE}, REQUEST_PERMISSION); 15 16 } 17 } 18 19 }
储存的uri路径 content://media/external/images/media/498662
创建图片
1 private void createFile() { 2 3 Uri contentUri = MediaStore.Images.Media.getContentUri(MediaStore.VOLUME_EXTERNAL); 4 ContentValues contentValues = new ContentValues(); 5 long dateTaken = System.currentTimeMillis(); 6 contentValues.put(MediaStore.Images.Media.DATE_TAKEN, dateTaken); 7 contentValues.put(MediaStore.Images.Media.DESCRIPTION, "创建的第一张图片"); 8 contentValues.put(MediaStore.Images.Media.IS_PRIVATE, 1); 9 contentValues.put(MediaStore.Images.Media.DISPLAY_NAME, "test"); 11 contentValues.put(MediaStore.Images.Media.MIME_TYPE, "image/png"); 12 contentValues.put(MediaStore.Images.Media.TITLE, "图片"); 14 contentValues.put(MediaStore.Images.Media.RELATIVE_PATH, "DCIM/test"); 15 long dateAdded = System.currentTimeMillis(); 16 contentValues.put(MediaStore.Images.Media.DATE_ADDED, dateAdded); 17 long dateModified = System.currentTimeMillis(); 18 contentValues.put(MediaStore.Images.Media.DATE_MODIFIED, dateModified); 19 20 Uri insert = getContentResolver().insert(contentUri, contentValues); 21 Log.d(TAG, "createFile: url : " + insert); 22 toast("createFile: url : " + insert); 23 try { 24 OutputStream outputStream = getContentResolver().openOutputStream(insert); 25 Bitmap bitmap = Bitmap.createBitmap(200, 200, Bitmap.Config.ARGB_8888); 26 bitmap.compress(Bitmap.CompressFormat.PNG, 90, outputStream);33 outputStream.write(33); 34 } catch (Exception e) { 35 e.printStackTrace(); 36 }finally { 37 showImg(insert); 38 } 39 }
查询对应name的图片
1 private Uri selectSingle() { 2 Uri queryUri = null; 3 Uri external = MediaStore.Images.Media.EXTERNAL_CONTENT_URI; 4 String selection = MediaStore.Images.Media.DISPLAY_NAME+"=?"; 5 String[] args = new String[]{"test.png"}; 6 String[] projection = new String[]{MediaStore.Images.Media._ID}; 7 Cursor cursor = getContentResolver().query(external, projection, selection, args, null); 8 if (cursor != null && cursor.moveToFirst()) { 9 queryUri = ContentUris.withAppendedId(external, cursor.getLong(0)); 10 Log.d(TAG, "selectSingle 查询成功，Uri路径 : "+queryUri); 11 toast(queryUri.toString()); 12 showImg(queryUri); 13 cursor.close(); 14 }else{ 15 Log.d(TAG, "selectSingle 查询失败"); 16 } 17 return queryUri; 18 }
更新文件
1 private void updateFile() { 2 int SENDER_REQUEST_CODE = 3; 3 if (checkSelfPermission(Manifest.permission.READ_EXTERNAL_STORAGE) != PackageManager.PERMISSION_GRANTED) { 4 toast("update : 没有读取权限" ); 5 return; 6 } 7 if (checkSelfPermission(Manifest.permission.WRITE_EXTERNAL_STORAGE) != PackageManager.PERMISSION_GRANTED) { 8 toast("update : 没有写入权限" ); 9 return; 10 } 11 Uri uri = selectSingle(); 12 if (TextUtils.isEmpty(uri.toString())){ 13 toast("update : uri为 null " ); 14 return; 15 } 16 try { 17 OutputStream outputStream = getContentResolver().openOutputStream(uri); 18 Bitmap bitmap = Bitmap.createBitmap(500, 500, Bitmap.Config.ARGB_8888); 19 bitmap.compress(Bitmap.CompressFormat.PNG, 90, outputStream); 20 Canvas canvas = new Canvas(bitmap); 21 canvas.drawColor(Color.YELLOW); 22 Paint paint = new Paint(); 23 paint.setColor(Color.BLACK); 24 paint.setTextSize(20); 25 canvas.drawText("修改",100,100,paint); 26 outputStream.write(33); 27 outputStream.close(); 28 } catch (FileNotFoundException e) { 29 e.printStackTrace(); 30 }catch (@SuppressLint("NewApi") RecoverableSecurityException e1) { 31 e1.printStackTrace(); 32 //捕获 RecoverableSecurityException异常，发起请求 33 try { 34 startIntentSenderForResult( 35 e1.getUserAction().getActionIntent().getIntentSender(), 36 SENDER_REQUEST_CODE, 37 null, 38 0, 39 0, 40 0 41 ); 42 } catch (Exception e){ 43 e.printStackTrace(); 44 } 45 } catch (IOException e) { 46 e.printStackTrace(); 47 } 48 }
删除文件
1 private void deleteFile() { 2 3 System.out.println("MediaStore.Images.Media.DISPLAY_NAME = " + MediaStore.Images.Media.DISPLAY_NAME); 4 5 Uri CONTENT_URI = MediaStore.Images.Media.EXTERNAL_CONTENT_URI; 6 String selectionclause = MediaStore.Images.Media.DISPLAY_NAME+"=?"; 7 String[] arguments = new String[]{"test.png"}; 8 int delete = getContentResolver().delete(CONTENT_URI, selectionclause, arguments); 9 Log.d(TAG, "deleteFile: " + delete); 10 if (delete > -1){ 11 // 如果发生异常返回-1 12 toast("delete : " + delete); 13 }else{ 14 Log.d(TAG, "deleteFile: 失败 " + delete); 15 } 16 }