Android MediaStore操作文件记录

google官方文档  

github地址

oppo给出的适配指南

huwei给的是适配指南

Android 10适配要点，作用域存储

---

 先申请权限

private void grantPermission() {
// 使用Environment.isExternalStorageLegacy()来检查APP的运行模式
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.Q &&
                !Environment.isExternalStorageLegacy()) {
            System.out.println("btnCreate = isExternalStorageLegacy : " + Environment.isExternalStorageLegacy());
        }
        if (ActivityCompat.checkSelfPermission(MainActivity.this, Manifest.permission.WRITE_EXTERNAL_STORAGE) != PackageManager.PERMISSION_GRANTED) {
            ActivityCompat.requestPermissions(MainActivity.this, new String[]{Manifest.permission.WRITE_EXTERNAL_STORAGE},
                    REQUEST_PERMISSION);
            Log.d(TAG, "grantPermission: 权限说明提示");
        } else {
            if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
                Log.d(TAG, "grantPermission: requestPermissions");
                requestPermissions(new String[]{Manifest.permission.WRITE_EXTERNAL_STORAGE}, REQUEST_PERMISSION);

            }
        }

    }

储存的uri路径 content://media/external/images/media/498662 

创建图片

private void createFile() {

        Uri contentUri = MediaStore.Images.Media.getContentUri(MediaStore.VOLUME_EXTERNAL);
        ContentValues contentValues = new ContentValues();
        long dateTaken = System.currentTimeMillis();
        contentValues.put(MediaStore.Images.Media.DATE_TAKEN, dateTaken);
        contentValues.put(MediaStore.Images.Media.DESCRIPTION, "创建的第一张图片");
        contentValues.put(MediaStore.Images.Media.IS_PRIVATE, 1);
        contentValues.put(MediaStore.Images.Media.DISPLAY_NAME, "test");
        contentValues.put(MediaStore.Images.Media.MIME_TYPE, "image/png");
        contentValues.put(MediaStore.Images.Media.TITLE, "图片");
        contentValues.put(MediaStore.Images.Media.RELATIVE_PATH, "DCIM/test");
        long dateAdded = System.currentTimeMillis();
        contentValues.put(MediaStore.Images.Media.DATE_ADDED, dateAdded);
        long dateModified = System.currentTimeMillis();
        contentValues.put(MediaStore.Images.Media.DATE_MODIFIED, dateModified);

        Uri insert = getContentResolver().insert(contentUri, contentValues);
        Log.d(TAG, "createFile: url : " + insert);
        toast("createFile: url : " + insert);
        try {
            OutputStream outputStream = getContentResolver().openOutputStream(insert);
            Bitmap bitmap = Bitmap.createBitmap(200, 200, Bitmap.Config.ARGB_8888);
            bitmap.compress(Bitmap.CompressFormat.PNG, 90, outputStream);33             outputStream.write(33);
        } catch (Exception e) {
            e.printStackTrace();
        }finally {
            showImg(insert);
        }
    }

查询对应name的图片

private Uri selectSingle() {
        Uri queryUri = null;
        Uri external = MediaStore.Images.Media.EXTERNAL_CONTENT_URI;
        String selection = MediaStore.Images.Media.DISPLAY_NAME+"=?";
        String[] args = new String[]{"test.png"};
        String[] projection = new String[]{MediaStore.Images.Media._ID};
        Cursor cursor = getContentResolver().query(external, projection, selection, args, null);
        if (cursor != null && cursor.moveToFirst()) {
            queryUri = ContentUris.withAppendedId(external, cursor.getLong(0));
            Log.d(TAG, "selectSingle 查询成功，Uri路径 : "+queryUri);
            toast(queryUri.toString());
            showImg(queryUri);
            cursor.close();
        }else{
            Log.d(TAG, "selectSingle 查询失败");
        }
        return queryUri;
    }

更新文件

private void updateFile() {
        int SENDER_REQUEST_CODE = 3;
        if (checkSelfPermission(Manifest.permission.READ_EXTERNAL_STORAGE) != PackageManager.PERMISSION_GRANTED) {
            toast("update : 没有读取权限" );
            return;
        }
        if (checkSelfPermission(Manifest.permission.WRITE_EXTERNAL_STORAGE) != PackageManager.PERMISSION_GRANTED) {
            toast("update : 没有写入权限" );
            return;
        }
        Uri uri = selectSingle();
        if (TextUtils.isEmpty(uri.toString())){
            toast("update : uri为 null " );
            return;
        }
        try {
            OutputStream outputStream = getContentResolver().openOutputStream(uri);
            Bitmap bitmap = Bitmap.createBitmap(500, 500, Bitmap.Config.ARGB_8888);
            bitmap.compress(Bitmap.CompressFormat.PNG, 90, outputStream);
            Canvas canvas = new Canvas(bitmap);
            canvas.drawColor(Color.YELLOW);
            Paint paint = new Paint();
            paint.setColor(Color.BLACK);
            paint.setTextSize(20);
            canvas.drawText("修改",100,100,paint);
            outputStream.write(33);
            outputStream.close();
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        }catch (@SuppressLint("NewApi") RecoverableSecurityException e1) {
            e1.printStackTrace();
            //捕获 RecoverableSecurityException异常，发起请求
            try {
                startIntentSenderForResult(
                        e1.getUserAction().getActionIntent().getIntentSender(),
                        SENDER_REQUEST_CODE,
                        null,
                        0,
                        0,
                        0
                );
            } catch (Exception e){
                e.printStackTrace();
            }
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

删除文件

private void deleteFile() {

        System.out.println("MediaStore.Images.Media.DISPLAY_NAME = " + MediaStore.Images.Media.DISPLAY_NAME);

        Uri CONTENT_URI = MediaStore.Images.Media.EXTERNAL_CONTENT_URI;
        String selectionclause = MediaStore.Images.Media.DISPLAY_NAME+"=?";
        String[] arguments = new String[]{"test.png"};
        int delete = getContentResolver().delete(CONTENT_URI, selectionclause, arguments);
        Log.d(TAG, "deleteFile: " + delete);
        if (delete > -1){
    //        如果发生异常返回-1
            toast("delete : " + delete);
        }else{
            Log.d(TAG, "deleteFile: 失败 " + delete);
        }
    }