Android：导入所需的系统jar包到Android studio
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1. 修改对于的AIDL文件，根据编译信息获知所需的jar包。
mmm /frameworks/base/ show commands > log.txt 2>&1
out/target/common/obj/JAVA_LIBRARIES/framework_intermediates/classes.jar （frameworks.jar是dex格式，非原生态Java文件）
2.导入classes.jar到Android studio工程：
将系统jar包放到module的libs文件夹下，在Module下的build.gradle添加：
provided files(\'libs/classes.jar\') //在android studio3.0 后，provided 被 compileOnly 替代
或界面如下操作：
3.添加依赖并修改优先级：
build.gradle：
dependencies { compileOnly files(\'libs/mframework.jar\') ... } gradle.projectsEvaluated { tasks.withType(JavaCompile) { options.compilerArgs.add(\'-Xbootclasspath/p:app/libs/mframework.jar\') } } preBuild { //将Android SDK优先级降到最低，实质是修改 Module下的.iml doLast { def imlFile = file(project.name + ".iml") println \'Change \' + project.name + \'.iml order\' try { def parsedXml = (new XmlParser()).parse(imlFile) def jdkNode = parsedXml.component[1].orderEntry.find { it.\'@type\' == \'jdk\' } parsedXml.component[1].remove(jdkNode) def sdkString = "Android API " + android.compileSdkVersion.substring("android-".length()) + " Platform" new Node(parsedXml.component[1], \'orderEntry\', [\'type\': \'jdk\', \'jdkName\': sdkString, \'jdkType\': \'Android SDK\']) groovy.xml.XmlUtil.serialize(parsedXml, new FileOutputStream(imlFile)) } catch (FileNotFoundException e) { // nop, iml not found } } }
或者找到对应Module下的.iml ，手动修改jar包引入顺序
把Android SDK的配置项放到最后，否则还是会提示找不到系统API：
打印指定 TAG/等级 的log： logcat LedHal:I *:S
4.编译错误：
a. java.lang.OutOfMemoryError: GC overhead limit exceeded
解决方法： build.gradle中添加：
dexOptions { javaMaxHeapSize "4g" }
b. Too many field references
Building Apps with Over 65K Methods
https://developer.android.com/tools/building/multidex.html
解决方法：
defaultConfig { // Enabling multidex support. multiDexEnabled true }
dependencies { compile \'com.android.support:multidex:1.0.0\' }
AndroidManifest.xml 中添加：android:name="android.support.multidex.MultiDexApplication"
<?xml version="1.0" encoding="utf-8"?> <manifest xmlns:android="http://schemas.android.com/apk/res/android" package="com.thisway.app_0001_leddemo" > <application android:name="android.support.multidex.MultiDexApplication" android:allowBackup="true" android:icon="@mipmap/ic_launcher" android:label="@string/app_name" android:theme="@style/AppTheme" > <activity android:name=".MainActivity" android:label="@string/app_name" > <intent-filter> <action android:name="android.intent.action.MAIN" /> <category android:name="android.intent.category.LAUNCHER" /> </intent-filter> </activity> </application> </manifest>
c. Error: Invoke-customs are only supported starting with Android O (--min-api 26)
com.android.builder.dexing.DexArchiveBuilderException: com.android.builder.dexing.DexArchiveBuilderException: Failed to process D:\\work\\AndroidStudioPrj\\APP_0001_LEDDemo\\settingsLib\\settingsLib.jar at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method) at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62) at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45) at java.lang.reflect.Constructor.newInstance(Constructor.java:423) at java.util.concurrent.ForkJoinTask.getThrowableException(ForkJoinTask.java:593) at java.util.concurrent.ForkJoinTask.reportException(ForkJoinTask.java:677) at java.util.concurrent.ForkJoinTask.join(ForkJoinTask.java:720) at com.android.ide.common.internal.WaitableExecutor.waitForTasksWithQuickFail(WaitableExecutor.java:146) at com.android.build.gradle.internal.transforms.DexArchiveBuilderTransform.transform(DexArchiveBuilderTransform.java:405) at com.android.build.gradle.internal.pipeline.TransformTask$2.call(TransformTask.java:239) at com.android.build.gradle.internal.pipeline.TransformTask$2.call(TransformTask.java:235) at com.android.builder.profile.ThreadRecorder.record(ThreadRecorder.java:102) at com.android.build.gradle.internal.pipeline.TransformTask.transform(TransformTask.java:230) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:498) at org.gradle.internal.reflect.JavaMethod.invoke(JavaMethod.java:73) at org.gradle.api.internal.project.taskfactory.IncrementalTaskAction.doExecute(IncrementalTaskAction.java:50) at org.gradle.api.internal.project.taskfactory.StandardTaskAction.execute(StandardTaskAction.java:39) at org.gradle.api.internal.project.taskfactory.StandardTaskAction.execute(StandardTaskAction.java:26) at org.gradle.api.internal.tasks.execution.ExecuteActionsTaskExecuter$1.run(ExecuteActionsTaskExecuter.java:124) at org.gradle.internal.progress.DefaultBuildOperationExecutor$RunnableBuildOperationWorker.execute(DefaultBuildOperationExecutor.java:336) at org.gradle.internal.progress.DefaultBuildOperationExecutor$RunnableBuildOperationWorker.execute(DefaultBuildOperationExecutor.java:328) at org.gradle.internal.progress.DefaultBuildOperationExecutor.execute(DefaultBuildOperationExecutor.java:199) at org.gradle.internal.progress.DefaultBuildOperationExecutor.run(DefaultBuildOperationExecutor.java:110) at org.gradle.api.internal.tasks.execution.ExecuteActionsTaskExecuter.executeAction(ExecuteActionsTaskExecuter.java:113) at org.gradle.api.internal.tasks.execution.ExecuteActionsTaskExecuter.executeActions(ExecuteActionsTaskExecuter.java:95) at org.gradle.api.internal.tasks.execution.ExecuteActionsTaskExecuter.execute(ExecuteActionsTaskExecuter.java:73) at org.gradle.api.internal.tasks.execution.OutputDirectoryCreatingTaskExecuter.execute(OutputDirectoryCreatingTaskExecuter.java:51) at org.gradle.api.internal.tasks.execution.SkipUpToDateTaskExecuter.execute(SkipUpToDateTaskExecuter.java:59) at org.gradle.api.internal.tasks.execution.ResolveTaskOutputCachingStateExecuter.execute(ResolveTaskOutputCachingStateExecuter.java:54) at org.gradle.api.internal.tasks.execution.ValidatingTaskExecuter.execute(ValidatingTaskExecuter.java:59) at org.gradle.api.internal.tasks.execution.SkipEmptySourceFilesTaskExecuter.execute(SkipEmptySourceFilesTaskExecuter.java:101) at org.gradle.api.internal.tasks.execution.FinalizeInputFilePropertiesTaskExecuter.execute(FinalizeInputFilePropertiesTaskExecuter.java:44) at org.gradle.api.internal.tasks.execution.CleanupStaleOutputsExecuter.execute(CleanupStaleOutputsExecuter.java:91) at org.gradle.api.internal.tasks.execution.ResolveTaskArtifactStateTaskExecuter.execute(ResolveTaskArtifactStateTaskExecuter.java:62) at org.gradle.api.internal.tasks.execution.SkipTaskWithNoActionsExecuter.execute(SkipTaskWithNoActionsExecuter.java:59) at org.gradle.api.internal.tasks.execution.SkipOnlyIfTaskExecuter.execute(SkipOnlyIfTaskExecuter.java:54) at org.gradle.api.internal.tasks.execution.ExecuteAtMostOnceTaskExecuter.execute(ExecuteAtMostOnceTaskExecuter.java:43) at org.gradle.api.internal.tasks.execution.CatchExceptionTaskExecuter.execute(CatchExceptionTaskExecuter.java:34) at org.gradle.execution.taskgraph.DefaultTaskGraphExecuter$EventFiringTaskWorker$1.run(DefaultTaskGraphExecuter.java:256) at org.gradle.internal.progress.DefaultBuildOperationExecutor$RunnableBuildOperationWorker.execute(DefaultBuildOperationExecutor.java:336) at org.gradle.internal.progress.DefaultBuildOperationExecutor$RunnableBuildOperationWorker.execute(DefaultBuildOperationExecutor.java:328) at org.gradle.internal.progress.DefaultBuildOperationExecutor.execute(DefaultBuildOperationExecutor.java:199) at org.gradle.internal.progress.DefaultBuildOperationExecutor.run(DefaultBuildOperationExecutor.java:110) at org.gradle.execution.taskgraph.DefaultTaskGraphExecuter$EventFiringTaskWorker.execute(DefaultTaskGraphExecuter.java:249) at org.gradle.execution.taskgraph.DefaultTaskGraphExecuter$EventFiringTaskWorker.execute(DefaultTaskGraphExecuter.java:238) at org.gradle.execution.taskgraph.DefaultTaskPlanExecutor$TaskExecutorWorker.processTask(DefaultTaskPlanExecutor.java:123) at org.gradle.execution.taskgraph.DefaultTaskPlanExecutor$TaskExecutorWorker.access$200(DefaultTaskPlanExecutor.java:79) at org.gradle.execution.taskgraph.DefaultTaskPlanExecutor$TaskExecutorWorker$1.execute(DefaultTaskPlanExecutor.java:104) at org.gradle.execution.taskgraph.DefaultTaskPlanExecutor$TaskExecutorWorker$1.execute(DefaultTaskPlanExecutor.java:98) at org.gradle.execution.taskgraph.DefaultTaskExecutionPlan.execute(DefaultTaskExecutionPlan.java:663) at org.gradle.execution.taskgraph.DefaultTaskExecutionPlan.executeWithTask(DefaultTaskExecutionPlan.java:597) at org.gradle.execution.taskgraph.DefaultTaskPlanExecutor$TaskExecutorWorker.run(DefaultTaskPlanExecutor.java:98) at org.gradle.internal.concurrent.ExecutorPolicy$CatchAndRecordFailures.onExecute(ExecutorPolicy.java:63) at org.gradle.internal.concurrent.ManagedExecutorImpl$1.run(ManagedExecutorImpl.java:46) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) at org.gradle.internal.concurrent.ThreadFactoryImpl$ManagedThreadRunnable.run(ThreadFactoryImpl.java:55) at java.lang.Thread.run(Thread.java:745) Caused by: com.android.builder.dexing.DexArchiveBuilderException: Failed to process D:\\work\\AndroidStudioPrj\\APP_0001_LEDDemo\\settingsLib\\settingsLib.jar at com.android.build.gradle.internal.transforms.DexArchiveBuilderTransform.launchProcessing(DexArchiveBuilderTransform.java:900) at com.android.build.gradle.internal.transforms.DexArchiveBuilderTransform.lambda$convertToDexArchive$6(DexArchiveBuilderTransform.java:825) at java.util.concurrent.ForkJoinTask$AdaptedCallable.exec(ForkJoinTask.java:1424) at java.util.concurrent.ForkJoinTask.doExec(ForkJoinTask.java:289) at java.util.concurrent.ForkJoinPool$WorkQueue.runTask(ForkJoinPool.java:1056) at java.util.concurrent.ForkJoinPool.runWorker(ForkJoinPool.java:1692) at java.util.concurrent.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:157) Caused by: com.android.builder.dexing.DexArchiveBuilderException: Error while dexing. The dependency contains Java 8 bytecode. Please enable desugaring by adding the following to build.gradle android { compileOptions { sourceCompatibility 1.8 targetCompatibility 1.8 } } See https://developer.android.com/studio/write/java8-support.html for details. Alternatively, increase the minSdkVersion to 26 or above.
5. 问服务使用反射
import android.os.IBinder;
try { //iLedService = ILedService.Stub.asInterface(ServiceManager.getService("led")); Method getService = Class.forName("android.os.ServiceManager").getMethod("getService", String.class); Object ledService = getService.invoke(null, "led"); //static对象第一次参数可以是NULL，调用invoke IBinder向上转换为Object，如有使用IBinder返回需强制转换 Method asInterface = Class.forName("android.os.ILedService$Stub").getMethod("asInterface", IBinder.class); proxy = asInterface.invoke(null, ledService); ledCtrl = Class.forName("android.os.ILedService$Stub$Proxy").getMethod("ledCtrl", int.class, int.class); //设置第i盏灯熄灭： ledCtrl.invoke(proxy, i, 0); } catch (NoSuchMethodException e) { e.printStackTrace(); } catch (ClassNotFoundException e) { e.printStackTrace(); } catch (IllegalAccessException e) { e.printStackTrace(); } catch (InvocationTargetException e) { e.printStackTrace(); }
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