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                ThinkChat2.0新版上線,更智能更精彩,支持會話、畫圖、視頻、閱讀、搜索等,送10W Token,即刻開啟你的AI之旅 廣告
                > 編寫:[wly2014](https://github.com/wly2014) - 原文: [http://developer.android.com/training/wearables/data-layer/assets.html](http://developer.android.com/training/wearables/data-layer/assets.html) 為了通過藍牙發送大量的二進制數據,比如圖片,要將一個[Asset](#)附加到數據元上,并放入復制而來的數據庫中。 Assets 能夠自動地處理數據緩存以避免重復發送,保護藍牙帶寬。一般的模式是:手持設備下載圖像,并將它壓縮到適合在可穿戴設備上顯示的大小,并以Asset傳給可穿戴設備。下面的例子演示此模式。 > **Note:** 盡管數據元的大小限制在100KB,但資源可以任意大。然而,傳輸大量資源會多方面地影響用戶體驗,因此,當你要傳輸大量資源時,要測試你的應用以保證它表現良好。 ### 傳輸資源 在Asset類中使用creat..()方法創建資源。下面,我們將一個bitmap轉化為字節流,然后調用[creatFromBytes()](#))方法創建資源。 ~~~ private static Asset createAssetFromBitmap(Bitmap bitmap) { final ByteArrayOutputStream byteStream = new ByteArrayOutputStream(); bitmap.compress(Bitmap.CompressFormat.PNG, 100, byteStream); return Asset.createFromBytes(byteStream.toByteArray()); } ~~~ 創建資源后,使用[DataMap](#)或者[PutDataRepuest](#)類中的putAsset()方法將其附加到數據元上,然后用[putDataItem()](#))方法將數據元放入數據庫。 ### 使用 PutDataRequest ~~~ Bitmap bitmap = BitmapFactory.decodeResource(getResources(), R.drawable.image); Asset asset = createAssetFromBitmap(bitmap); PutDataRequest request = PutDataRequest.create("/image"); request.putAsset("profileImage", asset); Wearable.DataApi.putDataItem(mGoogleApiClient, request); ~~~ ### 使用 PutDataMapRequest ~~~ Bitmap bitmap = BitmapFactory.decodeResource(getResources(), R.drawable.image); Asset asset = createAssetFromBitmap(bitmap); PutDataMapRequest dataMap = PutDataMapRequest.create("/image"); dataMap.getDataMap().putAsset("profileImage", asset) PutDataRequest request = dataMap.asPutDataRequest(); PendingResult<DataApi.DataItemResult> pendingResult = Wearable.DataApi .putDataItem(mGoogleApiClient, request); ~~~ ### 接收資源 創建資源后,你可能需要在另一連接端讀取。以下是如何實現回調以發現資源變化和提取Asset對象。 ~~~ @Override public void onDataChanged(DataEventBuffer dataEvents) { for (DataEvent event : dataEvents) { if (event.getType() == DataEvent.TYPE_CHANGED && event.getDataItem().getUri().getPath().equals("/image")) { DataMapItem dataMapItem = DataMapItem.fromDataItem(event.getDataItem()); Asset profileAsset = dataMapItem.getDataMap().getAsset("profileImage"); Bitmap bitmap = loadBitmapFromAsset(profileAsset); // Do something with the bitmap } } } public Bitmap loadBitmapFromAsset(Asset asset) { if (asset == null) { throw new IllegalArgumentException("Asset must be non-null"); } ConnectionResult result = mGoogleApiClient.blockingConnect(TIMEOUT_MS, TimeUnit.MILLISECONDS); if (!result.isSuccess()) { return null; } // convert asset into a file descriptor and block until it's ready InputStream assetInputStream = Wearable.DataApi.getFdForAsset( mGoogleApiClient, asset).await().getInputStream(); mGoogleApiClient.disconnect(); if (assetInputStream == null) { Log.w(TAG, "Requested an unknown Asset."); return null; } // decode the stream into a bitmap return BitmapFactory.decodeStream(assetInputStream); } ~~~
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