开发android wear程序时，经常需要将图片通过Assets 蓝牙传输。
1.创建asset,使用create...()方法，比如传递一个Bitmap传输如下
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private static Asset createAssetFromBitmap(Bitmap bitmap) {
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final ByteArrayOutputStream byteStream = new ByteArrayOutputStream();
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bitmap.compress(Bitmap.CompressFormat.PNG, 100, byteStream);
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return Asset.createFromBytes(byteStream.toByteArray());
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}
创建了asset，需要将它指向一个data item，通过使用putAsset（） 方法如下
使用PutDataRequest
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Bitmap bitmap = BitmapFactory.decodeResource(getResources(), R.drawable.image);
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Asset asset = createAssetFromBitmap(bitmap);
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PutDataRequest request = PutDataRequest.create("/image");
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request.putAsset("profileImage", asset);
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Wearable.DataApi.putDataItem(mGoogleApiClient, request);
使用PutDataMapRequest
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Bitmap bitmap = BitmapFactory.decodeResource(getResources(), R.drawable.image);
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Asset asset = createAssetFromBitmap(bitmap);
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PutDataRequest request = PutDataRequest.create("/image");
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request.putAsset("profileImage", asset);
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Wearable.DataApi.putDataItem(mGoogleApiClient, request);
使用PutDataMapRequest
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Bitmap bitmap = BitmapFactory.decodeResource(getResources(), R.drawable.image);
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Asset asset = createAssetFromBitmap(bitmap);
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PutDataMapRequest dataMap = PutDataMapRequest.create("/image");
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dataMap.getDataMap().putAsset("profileImage", asset)
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PutDataRequest request = dataMap.asPutDataRequest();
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PendingResult<DataApi.DataItemResult> pendingResult = Wearable.DataApi
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.putDataItem(mGoogleApiClient, request);
2. 手表端接收asset
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@Override
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public void onDataChanged(DataEventBuffer dataEvents) {
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for (DataEvent event : dataEvents) {
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if (event.getType() == DataEvent.TYPE_CHANGED &&
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event.getDataItem().getUri().getPath().equals("/image")) {
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DataMapItem dataMapItem = DataMapItem.fromDataItem(event.getDataItem());
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Asset profileAsset = dataMapItem.getDataMap().getAsset("profileImage");
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Bitmap bitmap = loadBitmapFromAsset(profileAsset);
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}
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}
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}
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public Bitmap loadBitmapFromAsset(Asset asset) {
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if (asset == null) {
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throw new IllegalArgumentException("Asset must be non-null");
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}
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ConnectionResult result =
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mGoogleApiClient.blockingConnect(TIMEOUT_MS, TimeUnit.MILLISECONDS);
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if (!result.isSuccess()) {
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return null;
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}
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InputStream assetInputStream = Wearable.DataApi.getFdForAsset(
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mGoogleApiClient, asset).await().getInputStream();
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mGoogleApiClient.disconnect();
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if (assetInputStream == null) {
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Log.w(TAG, "Requested an unknown Asset.");
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return null;
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}
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return BitmapFactory.decodeStream(assetInputStream);
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}
在手机与可穿戴设备Wearable通过蓝牙Bluetooth传递Assets（图片等）
原文：http://blog.csdn.net/zpf8861/article/details/41819467
