http://blog.csdn.net/laorenshen/article/details/41148253
学习使用Delphi for android 调用Java类库
2014-11-15 18:36 1053人阅读 评论(0) 收藏 举报
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安卓开发（27） 
Android是一套非常优秀的移动端操作系统,Delphi Xe5中也能直接调用SDK中提供的各项API,但是delphi自己封装的AndroidAPI非常少，在安装目录的 source\rtl\android 中，而且所提供的android API也没有明确sdk版本区别,很多事情都得我们自己来封装了完成。
在Delphi中将java类的通过接口进行包装，分为类方法接口及类实例方法接口两个部分，然后通过一种工厂方法将这两种接口混合起来，对外提供统一的java实例服务；
类方法：顾名思义就是属于类本身，不依赖类实例化就可调用的方法，类方法包装，主要是指包装java中静态属性，静态方法，构造方法（构造函数包装需要将构造函数命名为init，缺省是一个，也可以多个或者没有）;
类实例：就是依赖实例化类后才能调用的方法；
有了上面的概念，下面针对java的接口包装及类包装分别进行说明，所引用的代码为Jeff编写的android API 19 的语音朗读引擎接口包android.speech.tts.TextToSpeech的Delphi实现Androidapi.JNI.TTS.pas;
l 接口(java)
1. 类方法包装（继承IJavaClass）
JTextToSpeech_OnInitListenerClass = interface(IJavaClass)
[‘{58D32EFB-6528-4EC6-BA4F-28B22FE8E573}‘]
end;
注意命名规范，这样利于你，也利于大家J打头Class结尾,大小写保持后Java一致
2. 实例方法包装(继承IJavaInstance)
[JavaSignature(‘android/speech/tts/SynthesisCallback‘)]
JSynthesisCallback = interface(IJavaInstance)
[‘{190C13DE-BC7E-44CE-94F6-4AF1A84A4612}‘]
function audioAvailable(buffer: TJavaArray<byte>; offset: Integer; length: Integer): Integer; cdecl;
function done: Integer; cdecl;
procedure error; cdecl;
function getMaxBufferSize: Integer; cdecl;
function start(sampleRateInHz: Integer; audioFormat: Integer; channelCount: Integer): Integer; cdecl;
end;
TJSynthesisCallback = class(TJavaGenericImport<JSynthesisCallbackClass, JSynthesisCallback>) end;
注意命名规范前面加J, 大小写保持后Java一致;
注意自定义标签写法
[JavaSignature(‘android/speech/tts/SynthesisCallback‘)]
3. 工厂类及delphi封装的调用类
TJSynthesisCallback = class(TJavaGenericImport<JSynthesisCallbackClass, JSynthesisCallback>) end;
注意以T打头;
l 类(java)
1. 类方法包装(继承JObjectClass)
2. 实例方法包装(继承JObject)
3. 工厂类及delphi封装的调用类与接口相同；
Java类中各类型Delphi在Androidapi.JNI.JavaTypes也做了相应的封装，也有相应对照表在源码注释中，可对照参考
JObject = interface;//java.lang.Object
JClassLoader = interface;//java.lang.ClassLoader
JInputStream = interface;//java.io.InputStream
JByteArrayInputStream = interface;//java.io.ByteArrayInputStream
JNumber = interface;//java.lang.Number
JInteger = interface;//java.lang.Integer
JBoolean = interface;//java.lang.Boolean
JByte = interface;//java.lang.Byte
JEnumeration = interface;//java.util.Enumeration
JCalendar = interface;//java.util.Calendar
JAbstractCollection = interface;//java.util.AbstractCollection
JAbstractSet = interface;//java.util.AbstractSet
JHashSet = interface;//java.util.HashSet
JAbstractList = interface;//java.util.AbstractList
JSerializable = interface;//java.io.Serializable
JEnum = interface;//java.lang.Enum
JThread_State = interface;//java.lang.Thread$State
JThread_UncaughtExceptionHandler = interface;//java.lang.Thread$UncaughtExceptionHandler
JFileDescriptor = interface;//java.io.FileDescriptor
JFile = interface;//java.io.File
JArrayList = interface;//java.util.ArrayList
JRunnable = interface;//java.lang.Runnable
JCloseable = interface;//java.io.Closeable
JWriter = interface;//java.io.Writer
JIterable = interface;//java.lang.Iterable
JCollection = interface;//java.util.Collection
JList = interface;//java.util.List
JOutputStream = interface;//java.io.OutputStream
Jlang_Class = interface;//java.lang.Class
JThrowable = interface;//java.lang.Throwable
JException = interface;//java.lang.Exception
JJSONException = interface;//org.json.JSONException
JUUID = interface;//java.util.UUID
JAbstractMap = interface;//java.util.AbstractMap
JHashMap = interface;//java.util.HashMap
JRandom = interface;//java.util.Random
JAnnotation = interface;//java.lang.annotation.Annotation
JThread = interface;//java.lang.Thread
JDate = interface;//java.util.Date
JFilterOutputStream = interface;//java.io.FilterOutputStream
JPrintStream = interface;//java.io.PrintStream
JRuntimeException = interface;//java.lang.RuntimeException
JObserver = interface;//java.util.Observer
JFloat = interface;//java.lang.Float
JDouble = interface;//java.lang.Double
JPrintWriter = interface;//java.io.PrintWriter
JIterator = interface;//java.util.Iterator
JListIterator = interface;//java.util.ListIterator
JByteArrayOutputStream = interface;//java.io.ByteArrayOutputStream
JStackTraceElement = interface;//java.lang.StackTraceElement
JFileOutputStream = interface;//java.io.FileOutputStream
JAbstractStringBuilder = interface;//java.lang.AbstractStringBuilder
JStringBuilder = interface;//java.lang.StringBuilder
JCharSequence = interface;//java.lang.CharSequence
JGregorianCalendar = interface;//java.util.GregorianCalendar
JJSONTokener = interface;//org.json.JSONTokener
JMap = interface;//java.util.Map
JLocale = interface;//java.util.Locale
JTimeZone = interface;//java.util.TimeZone
JFileFilter = interface;//java.io.FileFilter
JEnumSet = interface;//java.util.EnumSet
Jutil_Observable = interface;//java.util.Observable
JFilenameFilter = interface;//java.io.FilenameFilter
JJSONObject = interface;//org.json.JSONObject
JString = interface;//java.lang.String
JSet = interface;//java.util.Set
JShort = interface;//java.lang.Short
JThreadGroup = interface;//java.lang.ThreadGroup
JComparator = interface;//java.util.Comparator
JJSONArray = interface;//org.json.JSONArray
JLong = interface;//java.lang.Long
JFileInputStream = interface;//java.io.FileInputStream
JStringBuffer = interface;//java.lang.StringBuffer
此单元也包含了部分转换函数如StringToJString 各位可以跟进源码察看；
l 如何调用
直接看代码把
var
text : JString;
begin
tts := TJTextToSpeech.JavaClass.init(SharedActivityContext, ttsListener);
text := StringToJString(‘hello!‘);
tts.speak(text, TJTextToSpeech.JavaClass.QUEUE_FLUSH, nil);
end;