1 /* 2 * Copyright (C) 2012 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 package com.android.gallery3d.common; 18 19 import android.os.AsyncTask; 20 import android.os.Build; 21 22 import java.lang.reflect.InvocationTargetException; 23 import java.lang.reflect.Method; 24 import java.util.concurrent.Executor; 25 26 /** 27 * Helper class to execute an AsyncTask in parallel if SDK version is 11 or newer. 28 */ 29 public class AsyncTaskUtil { 30 private static Method sMethodExecuteOnExecutor; 31 private static Executor sExecutor; 32 static { 33 if (Build.VERSION.SDK_INT >= 11) { 34 try { 35 sExecutor = (Executor) AsyncTask.class.getField("THREAD_POOL_EXECUTOR") 36 .get(null); 37 sMethodExecuteOnExecutor = AsyncTask.class.getMethod( 38 "executeOnExecutor", Executor.class, Object[].class); 39 } catch (IllegalAccessException e) { 40 throw new RuntimeException(e); 41 } catch (NoSuchFieldException e) { 42 throw new RuntimeException(e); 43 } catch (NoSuchMethodException e) { 44 throw new RuntimeException(e); 45 } 46 } 47 } 48 49 public static <Param> void executeInParallel(AsyncTask<Param, ?, ?> task, Param... params) { 50 if (Build.VERSION.SDK_INT < 11) { 51 task.execute(params); 52 } else { 53 try { 54 sMethodExecuteOnExecutor.invoke(task, sExecutor, params); 55 } catch (IllegalAccessException e) { 56 throw new RuntimeException(e); 57 } catch (InvocationTargetException e) { 58 throw new RuntimeException(e); 59 } 60 } 61 } 62 63 private AsyncTaskUtil() { 64 } 65 } 66 67
