我們的registerTransfrom操作很簡單
public void registerTransform(@NonNull Transform transform, Object... dependencies) {
transforms.add(transform);
transformDependencies.add(Arrays.asList(dependencies));
}
直線轉(zhuǎn)移到,andrdid的所有Plugin都會執(zhí)行cerateTasks方法
BasePlugin.java
private void createTasks() {
threadRecorder.record(
ExecutionType.TASK_MANAGER_CREATE_TASKS,
project.getPath(),
null,
() -> taskManager.createTasksBeforeEvaluate());
project.afterEvaluate(
CrashReporting.afterEvaluate(
p -> {
sourceSetManager.runBuildableArtifactsActions();
threadRecorder.record(
ExecutionType.BASE_PLUGIN_CREATE_ANDROID_TASKS,
project.getPath(),
null,
this::createAndroidTasks);
}));
}
createAndroidTasks創(chuàng)建了很多android的任務(wù)
BasePlugin.java
@VisibleForTesting
final void createAndroidTasks() {
......
List<VariantScope> variantScopes = variantManager.createAndroidTasks();
ApiObjectFactory apiObjectFactory =
new ApiObjectFactory(
globalScope.getAndroidBuilder(),
extension,
variantFactory,
project.getObjects());
for (VariantScope variantScope : variantScopes) {
BaseVariantData variantData = variantScope.getVariantData();
apiObjectFactory.create(variantData);
}
.....
}
com.android.build.gradle.internal.VariantManager.java
public List<VariantScope> createAndroidTasks() {
variantFactory.validateModel(this);
variantFactory.preVariantWork(project);
if (variantScopes.isEmpty()) {
populateVariantDataList();
}
// Create top level test tasks.
taskManager.createTopLevelTestTasks(!productFlavors.isEmpty());
for (final VariantScope variantScope : variantScopes) {
createTasksForVariantData(variantScope);
}
taskManager.createSourceSetArtifactReportTask(globalScope);
taskManager.createReportTasks(variantScopes);
return variantScopes;
}
com.android.build.gradle.internal.VariantManager.java
public void createTasksForVariantData(final VariantScope variantScope) {
final BaseVariantData variantData = variantScope.getVariantData();
final VariantType variantType = variantData.getType();
final GradleVariantConfiguration variantConfig = variantScope.getVariantConfiguration();
taskManager.createAssembleTask(variantData);
if (variantType.isBaseModule()) {
taskManager.createBundleTask(variantData);
}
if (variantType.isTestComponent()) {
......
} else {
taskManager.createTasksForVariantScope(variantScope);
}
}
com.android.build.gradle.internal.LibraryTaskManager.java
public void createTasksForVariantScope(@NonNull final VariantScope variantScope) {
......
List<Transform> customTransforms = extension.getTransforms();
List<List<Object>> customTransformsDependencies = extension.getTransformsDependencies();
for (int i = 0, count = customTransforms.size(); i < count; i++) {
Transform transform = customTransforms.get(i);
// Check the transform only applies to supported scopes for libraries:
// We cannot transform scopes that are not packaged in the library
// itself.
Sets.SetView<? super Scope> difference =
Sets.difference(transform.getScopes(), TransformManager.PROJECT_ONLY);
if (!difference.isEmpty()) {
String scopes = difference.toString();
globalScope
.getAndroidBuilder()
.getIssueReporter()
.reportError(
Type.GENERIC,
new EvalIssueException(
String.format(
"Transforms with scopes '%s' cannot be applied to library projects.",
scopes)));
}
List<Object> deps = customTransformsDependencies.get(i);
transformManager.addTransform(
taskFactory,
variantScope,
transform,
null,
task -> {
if (!deps.isEmpty()) {
task.dependsOn(deps);
}
},
taskProvider -> {
// if the task is a no-op then we make assemble task
// depend on it.
if (transform.getScopes().isEmpty()) {
TaskFactoryUtils.dependsOn(
variantScope.getTaskContainer().getAssembleTask(),
taskProvider);
}
});
}
·······
}
createTasksForVariantScope創(chuàng)建了很多android打包任務(wù)兽掰。
extension.getTransforms()是獲取之前我們注冊的transform
extension.getTransformsDependencies()是獲取注冊的依賴
總結(jié)：
plugin交由注冊到AppExtension
最后統(tǒng)一交由TaskManager執(zhí)行addTransform生成Task。一個transfrom就是一個task。
transfrom依賴關(guān)系是通過task的依賴設(shè)置來完成的
