j2me程序移植入android总结
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思路无非3种:
1, 提供一个android下的j2me虚拟机,让j2me程序运行 如OPhone下的百宝箱
2, 提供一个转换工具,将j2me的jar放入apk中,重新用apt制作成apk安装程序,并允许,如netmite
3, 提供类库中间层,将android中没有的j2me类库用android的程序实现出来,并用android sdk重新编译成apk 如J2AB
考虑到已有j2me工程QMusic的整套代码,同时代码本身如歌曲扫描,播放,界面刷新,有优化的余地,屏幕尺寸需要适应等问题,故采用第3种做法,从j2ab倒入代码,并添加未实现类库,程序可以运行,再通过细调,最终得以完全展现在android平台上。并较好的解决了屏幕变化带来的影响,为之后类似的工作打下基础,扩充的类库列表如下,备忘:
public class J2ABMIDletActivity extends Activity implements Toolkit
package j2ab.android.io.file;
public class AndroidURLConnection implements HttpConnection
public class LogOutputStream extends OutputStream
public class AndroidFileConnection implements FileConnection
package j2ab.android.lcdui;
public interface Toolkit
package j2ab.android.pim;
public class AndroidContactList extends AndroidPIMList implements ContactList
public class AndroidPIMItem implements PIMItem
public abstract class AndroidPIMList implements PIMList
public class PreloadingAndroidPIMItem extends AndroidPIMItem
package javax.microedition.io;
public interface Connection
public class ConnectionNotFoundException extends IOException
public class Connector
public interface HttpConnection extends StreamConnection
public interface InputConnection extends Connection
public interface OutputConnection extends Connection
public interface StreamConnection extends InputConnection, OutputConnection
package javax.microedition.io.file;
public interface FileConnection extends javax.microedition.io.Connection, StreamConnection
public interface FileSystemListener
public class FileSystemRegistry
package javax.microedition.lcdui;
public class Alert extends Screen
public class AlertType
public abstract class Canvas extends Displayable implements OnKeyListener
public interface Choice
public class ChoiceGroup extends Item implements OnKeyListener, Choice
public class Command
public interface CommandListener
public class Display
public abstract class Displayable
public class Font
public class Form extends Screen
public abstract class GameCanvas extends Canvas
public class Gauge extends Item implements Runnable
public class Graphics
public class IconItem extends StringItem
public class Image
public abstract class Item
public interface ItemCommandListener
public abstract class Layer
public class List extends Screen implements OnKeyListener
public abstract class Screen extends Displayable
public class Sprite extends Layer
public class StringItem extends Item implements Runnable
public class Style
public class TextBox extends Screen implements Runnable
public class TextField extends Item implements Runnable
public class TiledLayer extends Layer
package javax.microedition.media;
public class AndroidMediaPlayer implements Player, Controllable
public interface Control
public interface Controllable
public class Manager
public class MediaException extends Exception
public interface Player extends Controllable
public interface PlayerListener
public class TonePlayer implements Player, ToneControl, Controllable
package javax.microedition.media.control;
public interface ToneControl extends Control
public interface VolumeControl extends Control
package javax.microedition.midlet;
public abstract class MIDlet
public class MIDletStateChangeException extends Exception
package javax.microedition.pim;
public interface Contact extends PIMItem
public interface ContactList extends PIMList
public class PIM
public class PIMException extends Exception
public interface PIMItem
public interface PIMList
package javax.microedition.rms;
public class InvalidRecordIDException extends RecordStoreException
public interface RecordComparator
public interface RecordEnumeration
public interface RecordFilter
public class RecordStore
public class RecordStoreException extends Exception
public class RecordStoreNotFoundException extends RecordStoreException
public class RecordStoreNotOpenException extends RecordStoreException
近似替代对象:
Canvas <===> SurfaceView
TextBox,List,Form,ChoiceGroup,StringItem <===> XML+view.inflate
Graphics <===> Canvas
Image <===> Bitmap
Player <===> MediaPlayer
MIDlet <===> Activity
ContactList,media file scan <===> ContentResolver
RecordStore <===> Hash File,SQLite
HttpConnection <===> HttpURLConnection
FileConnection <===> File
/res/... <===> AssetManager.open("res/...")
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