3G Eden
RSS下面是完整的代码文件：
MainActivity.java
package com.amazon.lambda.androidimageprocessor;import android.app.Activity;import android.app.ProgressDialog;import android.graphics.Bitmap;import android.graphics.BitmapFactory;import android.os.AsyncTask;import android.os.Bundle;import android.util.Base64;import android.util.Log;import android.view.View;import android.widget.ImageView;import android.widget.Spinner;import android.widget.Toast;import com.amazon.lambda.androidimageprocessor.lambda.ILambdaInvoker;import com.amazon.lambda.androidimageprocessor.lambda.ImageConvertRequest;import com.amazonaws.auth.CognitoCachingCredentialsProvider;import com.amazonaws.mobileconnectors.lambdainvoker.LambdaFunctionException;import com.amazonaws.mobileconnectors.lambdainvoker.LambdaInvokerFactory;import com.amazonaws.regions.Regions;import java.io.ByteArrayOutputStream;import java.util.ArrayList;import java.util.HashMap;import java.util.List;import java.util.Map;import java.util.Objects;public class MainActivity extends Activity { private ILambdaInvoker lambda; private ImageView selectedImage; private String selectedImageBase64; private ProgressDialog progressDialog; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); // Create an instance of CognitoCachingCredentialsProvider CognitoCachingCredentialsProvider cognitoProvider = new CognitoCachingCredentialsProvider( this.getApplicationContext(), "us-east-1:2a40105a-b330-43cf-8d4e-b647d492e76e", Regions.US_EAST_1); // Create LambdaInvokerFactory, to be used to instantiate the Lambda proxy. LambdaInvokerFactory factory = new LambdaInvokerFactory(this.getApplicationContext(), Regions.US_EAST_1, cognitoProvider); // Create the Lambda proxy object with a default Json data binder. lambda = factory.build(ILambdaInvoker.class); // ping lambda function to make sure everything is working pingLambda(); } // ping the lambda function @SuppressWarnings("unchecked") private void pingLambda() { Map event = new HashMap(); event.put("operation", "ping"); // The Lambda function invocation results in a network call. // Make sure it is not called from the main thread. new AsyncTask<Map, Void, String>() { @Override protected String doInBackground(Map... params) { // invoke "ping" method. In case it fails, it will throw a // LambdaFunctionException. try { return lambda.ping(params[0]); } catch (LambdaFunctionException lfe) { Log.e("Tag", "Failed to invoke ping", lfe); return null; } } @Override protected void onPostExecute(String result) { if (result == null) { return; } // Display a quick message Toast.makeText(MainActivity.this, "Made contact with AWS lambda", Toast.LENGTH_LONG).show(); } }.execute(event); } // event handler for "process image" button public void processImage(View view) { // no image has been selected yet if (selectedImageBase64 == null) { Toast.makeText(this, "Please tap one of the images above", Toast.LENGTH_LONG).show(); return; } // get selected filter String filter = ((Spinner) findViewById(R.id.filter_picker)).getSelectedItem().toString(); // assemble new request ImageConvertRequest request = new ImageConvertRequest(); request.setBase64Image(selectedImageBase64); request.setInputExtension("png"); request.setOutputExtension("png"); // custom arguments per filter List customArgs = new ArrayList(); request.setCustomArgs(customArgs); switch (filter) { case "Sepia": customArgs.add("-sepia-tone"); customArgs.add("65%"); break; case "Black/White": customArgs.add("-colorspace"); customArgs.add("Gray"); break; case "Negate": customArgs.add("-negate"); break; case "Darken": customArgs.add("-fill"); customArgs.add("black"); customArgs.add("-colorize"); customArgs.add("50%"); break; case "Lighten": customArgs.add("-fill"); customArgs.add("white"); customArgs.add("-colorize"); customArgs.add("50%"); break; default: return; } // async request to lambda function new AsyncTask() { @Override protected String doInBackground(ImageConvertRequest... params) { try { return lambda.convert(params[0]); } catch (LambdaFunctionException e) { Log.e("Tag", "Failed to convert image"); return null; } } @Override protected void onPostExecute(String result) { // if no data was returned, there was a failure if (result == null || Objects.equals(result, "")) { hideLoadingDialog(); Toast.makeText(MainActivity.this, "Processing failed", Toast.LENGTH_LONG).show(); return; } // otherwise decode the base64 data and put it in the selected image view byte[] imageData = Base64.decode(result, Base64.DEFAULT); selectedImage.setImageBitmap(BitmapFactory.decodeByteArray(imageData, 0, imageData.length)); hideLoadingDialog(); } }.execute(request); showLoadingDialog(); } /* Select methods for each image */ public void selectLambdaImage(View view) { selectImage(R.drawable.lambda); selectedImage = (ImageView) findViewById(R.id.static_lambda); Toast.makeText(this, "Selected image 'lambda'", Toast.LENGTH_LONG).show(); } public void selectSeattleImage(View view) { selectImage(R.drawable.seattle); selectedImage = (ImageView) findViewById(R.id.static_seattle); Toast.makeText(this, "Selected image 'seattle'", Toast.LENGTH_LONG).show(); } public void selectSquirrelImage(View view) { selectImage(R.drawable.squirrel); selectedImage = (ImageView) findViewById(R.id.static_squirrel); Toast.makeText(this, "Selected image 'squirrel'", Toast.LENGTH_LONG).show(); } public void selectLinuxImage(View view) { selectImage(R.drawable.linux); selectedImage = (ImageView) findViewById(R.id.static_linux); Toast.makeText(this, "Selected image 'linux'", Toast.LENGTH_LONG).show(); } // extract the base64 encoded data of the drawable resource `id` private void selectImage(int id) { Bitmap bmp = BitmapFactory.decodeResource(getResources(), id); ByteArrayOutputStream stream = new ByteArrayOutputStream(); bmp.compress(Bitmap.CompressFormat.PNG, 100, stream); selectedImageBase64 = Base64.encodeToString(stream.toByteArray(), Base64.DEFAULT); } // reset images to their original state public void reset(View view) { ((ImageView) findViewById(R.id.static_lambda)).setImageDrawable(getResources().getDrawable(R.drawable.lambda, getTheme())); ((ImageView) findViewById(R.id.static_seattle)).setImageDrawable(getResources().getDrawable(R.drawable.seattle, getTheme())); ((ImageView) findViewById(R.id.static_squirrel)).setImageDrawable(getResources().getDrawable(R.drawable.squirrel, getTheme())); ((ImageView) findViewById(R.id.static_linux)).setImageDrawable(getResources().getDrawable(R.drawable.linux, getTheme())); Toast.makeText(this, "Please choose from one of these images", Toast.LENGTH_LONG).show(); } private void showLoadingDialog() { progressDialog = ProgressDialog.show(this, "Please wait...", "Processing image", true, false); } private void hideLoadingDialog() { progressDialog.dismiss(); }} |
这就是这个移动应用所需要的了：一个数据模型(又叫做 Java 类)，一个控制模型(又叫做成对的方法)，三个用来对一些东西进行初始化的语句，而后就是一个被 try/catch 块包围起来的远程调用了 … 够简单。
本文转自：开源中国社区 [http://www.oschina.net]
本文标题：无服务器的微服务
本文地址：http://www.oschina.net/translate/microservices-without-the-servers
参与翻译：Iam魔方, leoxu, HAILINCAI, 武汉加油, 无若, 木兰宿莽
英文原文：Microservices without the Servers
时间:2015-10-29 09:18
来源:开源中国社区
作者:oschina
原文链接
