安卓APP开发关于AOP技术的使用详解，首先深圳APP开发公司提醒在工程里添加一个名为“liba_aspectj”的Module，包含AspectJ相关功能代码，
如图28-1所示：图28-1AOPAspect.java里是AspectJ功能代码，AOPTimer.java里是计时功能代码。此Module的build.gradle文件内容如下：
如图28-1所示：图28-1AOPAspect.java里是AspectJ功能代码，AOPTimer.java里是计时功能代码。此Module的build.gradle文件内容如下：import com. android. build. gradle. LibraryPlugin import org. aspectj. bridge. IMessage import org. aspectj. bridge. MessageHandler import org. aspectj. tools. ajc. Main
apply plugin: 'com. android. library' buildscript { repositories { jcenter() } dependencies { classpath 'com. android. tools. build: gradle: 2. 1. 0' classpath 'org. aspectj: aspectjtools: 1. 8. 9' classpath 'org. aspectj: aspectjweaver: 1. 8. 9' } } repositories { mavenCentral() } dependencies { compile 'org. aspectj: aspectjrt: 1. 8. 9' compile 'com. android. support: appcompat- v7: 22. 2. 1' } android { compileSdkVersion 23 buildToolsVersion '23. 0. 2' lintOptions {
abortOnError false } } android. libraryVariants. all { variant -> LibraryPlugin plugin = project. plugins. getPlugin( LibraryPlugin) JavaCompile javaCompile = variant. javaCompile javaCompile. doLast { String[] args = ["-showWeaveInfo", "-1. 8",// 当前 使用 的 JDK 版本 "-inpath", javaCompile. destinationDir. toString(), "-aspectpath", javaCompile. classpath. asPath, "-d", javaCompile. destinationDir. toString(), "-classpath", javaCompile. classpath. asPath, "-bootclasspath", plugin. project. android. bootClasspath. join( File. pathSeparator)] MessageHandler handler = new MessageHandler( true); new Main(). run( args, handler) def log = project. logger for (IMessage message : handler. getMessages( null, true)) { switch (message. getKind()) { case IMessage. ABORT:
case IMessage. ERROR: case IMessage. FAIL: log. error message. message, message. thrown break; case IMessage. WARNING: case IMessage. INFO: log. info message. message, message. thrown break; case IMessage. DEBUG: log. debug message. message, message. thrown break; } } } }
如要在application模块的代码里使用AspectJ库，需要在build.gradle文件里添加如下代码：
import org. aspectj. bridge. IMessage import org. aspectj. bridge. MessageHandler import org. aspectj. tools. ajc. Main buildscript {
repositories { mavenCentral() } dependencies { classpath 'org. aspectj: aspectjtools: 1. 8. 9' } } apply plugin: 'com. android. application' dependencies { compile project(': liba_ aspectj') } … final def log = project. logger final def variants = project. android. applicationVariants variants. all { variant -> if (!variant. buildType. isDebuggable()) { log. debug(" Skipping non- debuggable build type '${variant. buildType. name}'.") return; } JavaCompile javaCompile = variant. javaCompile
javaCompile. doLast { String[] args = ["-showWeaveInfo", "-1. 8", "-inpath", javaCompile. destinationDir. toString(), "-aspectpath", javaCompile. classpath. asPath, "-d", javaCompile. destinationDir. toString(), "-classpath", javaCompile. classpath. asPath, "-bootclasspath", project. android. bootClasspath. join( File. pathSeparator)] log. debug "ajc args: " + Arrays. toString( args) MessageHandler handler = new MessageHandler( true); new Main(). run( args, handler); for (IMessage message : handler. getMessages( null, true)) { switch (message. getKind()) { case IMessage. ABORT: case IMessage. ERROR: case IMessage. FAIL: log. error message. message, message. thrown break; case IMessage. WARNING: log. warn message. message, message. thrown break; case IMessage. INFO:
log. info message. message, message. thrown break; case IMessage. DEBUG: log. debug message. message, message. thrown break; } } } }
如要在library模块的代码里使用AspectJ库，需要在build.gradle文件里添加如下代码：
import com. android. build. gradle. LibraryPlugin import org. aspectj. bridge. IMessage import org. aspectj. bridge. MessageHandler import org. aspectj. tools. ajc. Main buildscript { repositories { mavenCentral() } dependencies { classpath 'org. aspectj: aspectjtools: 1. 8. 9'
} } apply plugin: 'com. android. library' … dependencies { compile project(': liba_ aspectj') } android. libraryVariants. all { variant -> LibraryPlugin plugin = project. plugins. getPlugin( LibraryPlugin) JavaCompile javaCompile = variant. javaCompile javaCompile. doLast { String[] args = ["-showWeaveInfo", "-1. 8", "-inpath", javaCompile. destinationDir. toString(), "-aspectpath", javaCompile. classpath. asPath, "-d", javaCompile. destinationDir. toString(), "-classpath", javaCompile. classpath. asPath, "-bootclasspath", plugin. project. android. bootClasspath. join( File. pathSeparator)] MessageHandler handler = new MessageHandler( true); new Main(). run( args, handler)
def log = project. logger for (IMessage message : handler. getMessages( null, true)) { switch (message. getKind()) { case IMessage. ABORT: case IMessage. ERROR: case IMessage. FAIL: log. error message. message, message. thrown break; case IMessage. WARNING: case IMessage. INFO: log. info message. message, message. thrown break; case IMessage. DEBUG: log. debug message. message, message. thrown break; } } } }
如要注入代码，需要先定义Pointcut，常用的指令格式如下所示：
execution( modifiers- pattern？ ret- type- pattern declaring- type- pattern？
name- pattern( param- pattern) throws- pattern？)
modifiers-pattern：修饰符ret-type-pattern：方法的返回值类型declaring-type-pattern：方法所属的包名或类名name-pattern：方法名param-pattern：方法参数throws-pattern：方法抛出的异常类型注意：带？表示参数是可选项。使用的最多的返回类型模式是*，表示匹配任意的返回类型。方法参数的具体表示：()匹配了一个不接受任何参数的方法(..)匹配了一个接受任意数量参数的方法(零或者更多)(*)匹配了一个接受一个任何类型的参数的方法
(*,String)匹配了一个接受两个参数的方法，第一个可以是任意类型，第二个则必须是String类型。
如工程中包含如图28-2所示的包和类：MainActivity.java中有如下代码：
如工程中包含如图28-2所示的包和类：MainActivity.java中有如下代码：@Override protected void onCreate( Bundle savedInstanceState) { super. onCreate( savedInstanceState); setContentView( R. layout. activity_ main); Toolbar toolbar = (Toolbar) findViewById( R. id. toolbar); setSupportActionBar( toolbar); initVariables();
initViews(); loadData(); } public void initVariables() { … } public void initViews () { … } public void loadData () { … } public void logIn() { Intent intent = new Intent( MainActivity. this, LoginActivity. class); startActivity( intent); }
在LoginActivity.java中定义了以下方法：
@Override
protected void onCreate( Bundle savedInstanceState) { super. onCreate( savedInstanceState); setContentView( R. layout. activity_ login); } @Override public void finish(){ super. finish(); } @Override public void onBackPressed(){ super. onBackPressed(); }
想要输出com.example.aop包里所有onCreate方法的执行时间，按如下方式定义Pointcut：private static final String POINT_ METHOD = "execution(* com. example. aop.*. onCreate(..))";
之前提到，注入代码的方式有before、after和around3种，表示在目标方法执行之前、执行后和执行前后同时注入代码。好了，APP开发公司本文关于“安卓APP开发关于AOP技术的使用详解”的APP制作知识就分享到这里，谢谢关注，本站下期会继续就这个问题与各位进行分享，博纳网络编辑整理。
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