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ButterKnife 中 JavaPoet 的运用
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| package butterknife.compiler; | |
| import com.squareup.javapoet.ClassName; | |
| import com.squareup.javapoet.CodeBlock; | |
| import com.squareup.javapoet.FieldSpec; | |
| import com.squareup.javapoet.JavaFile; | |
| import com.squareup.javapoet.MethodSpec; | |
| import com.squareup.javapoet.TypeSpec; | |
| import org.junit.Test; | |
| import java.io.IOException; | |
| import javax.lang.model.element.Modifier; | |
| import static butterknife.compiler.BindingSet.UTILS; | |
| import static javax.lang.model.element.Modifier.PUBLIC; | |
| /** | |
| * Created by geniusmart on 2017/4/11. | |
| */ | |
| public class PoetAboutButterKnife { | |
| private static final ClassName VIEW = ClassName.get("android.view", "View"); | |
| private static final ClassName UNBINDER = ClassName.get("butterknife", "Unbinder"); | |
| private static final ClassName UI_THREAD = | |
| ClassName.get("android.support.annotation", "UiThread"); | |
| private static final ClassName CALL_SUPER = | |
| ClassName.get("android.support.annotation", "CallSuper"); | |
| /** | |
| * 执行后生成代码 | |
| */ | |
| @Test | |
| public void poet() throws IOException, ClassNotFoundException { | |
| Class<?> activityClass = Class.forName("com.geniusmart.TestActivity"); | |
| // 创建属性 | |
| FieldSpec targetField = FieldSpec.builder(activityClass, "target") | |
| .addModifiers(Modifier.PRIVATE) | |
| .build(); | |
| //创建构造器1 | |
| MethodSpec constructorForActivity = MethodSpec.constructorBuilder() | |
| .addAnnotation(UI_THREAD) | |
| .addModifiers(PUBLIC) | |
| .addParameter(activityClass, "target") | |
| .addStatement("this(target, target.getWindow().getDecorView())") | |
| .build(); | |
| // 生成程序片段：target.one = Utils.findRequiredView(source, 1, "field 'one'"); | |
| CodeBlock codeBlock = CodeBlock.builder() | |
| .add("target.$L = ", "one")// 属性名 one 实际上应该通过注解获取 | |
| .add("$T.findRequiredView", UTILS) | |
| .add("(source, $L", 1) //属性值实际上应该通过注解获取 | |
| .add(", $S", "field 'one'") | |
| .add(")") | |
| .build(); | |
| // 创建构造器2 | |
| MethodSpec otherConstructor = MethodSpec.constructorBuilder() | |
| .addAnnotation(UI_THREAD) | |
| .addModifiers(PUBLIC) | |
| .addParameter(activityClass, "target") | |
| .addParameter(VIEW, "source") | |
| .addStatement("this.target = target") | |
| .addStatement("$L", codeBlock) // 增加程序片段 | |
| .build(); | |
| // 创建解构函数 unbind | |
| MethodSpec unBindeMethod = MethodSpec.methodBuilder("unbind") | |
| .addAnnotation(Override.class) | |
| .addModifiers(PUBLIC) | |
| .addAnnotation(CALL_SUPER) | |
| .addStatement("$T target = this.target", activityClass) | |
| .addStatement("if (target == null) throw new $T($S)", IllegalStateException.class, | |
| "Bindings already cleared.") | |
| .addStatement("$N = null", "this.target") | |
| .addStatement("target.$L = null", "one") | |
| .build(); | |
| // 创建类 | |
| TypeSpec typeSpec = TypeSpec.classBuilder("TestActivity_ViewBinding") | |
| .addModifiers(PUBLIC) // 类为public | |
| .addSuperinterface(UNBINDER) // 类为Unbinder的实现类 | |
| .addField(targetField) // 生成属性 private TestActivity target | |
| .addMethod(constructorForActivity) // 生成构造器1 | |
| .addMethod(otherConstructor) // 生成构造器2 | |
| .addMethod(unBindeMethod) // 生成unbind()方法 | |
| .build(); | |
| // 生成 Java 文件 | |
| JavaFile javaFile = JavaFile.builder("com.geniusmart", typeSpec)//包名和类 | |
| .addFileComment("Generated code from Butter Knife. Do not modify!") | |
| .build(); | |
| javaFile.writeTo(System.out); | |
| } | |
| } |
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