使用MMAPI提供的接口查询设备支持的媒体类型和协议，这样可以动态的调整程序的功能特性，避免在运行的时候抛出异常。
import javax.microedition.lcdui.*;
import javax.microedition.midlet.*;
import javax.microedition.media.*;
public class MediaInformationMIDlet extends MIDlet implements CommandListener {
private Form mInformationForm;
public void startApp() {
if (mInformationForm == null) {
mInformationForm =
new Form("Content types and protocols");
String[] contentTypes =
Manager.getSupportedContentTypes(null);
for (int i = 0; i < contentTypes.length; i++) {
String[] protocols =
Manager.getSupportedProtocols(contentTypes[i]);
for (int j = 0; j < protocols.length; j++) {
StringItem si = new StringItem(contentTypes[i] + ": ",
protocols[j]);
//si.setLayout(Item.LAYOUT_NEWLINE_AFTER);
mInformationForm.append(si);
}
}
Command exitCommand = new Command("Exit", Command.EXIT, 0);
mInformationForm.addCommand(exitCommand);
mInformationForm.setCommandListener(this);
}
Display.getDisplay(this).setCurrent(mInformationForm);
}
public void pauseApp() {}
public void destroyApp(boolean unconditional) {}
public void commandAction(Command c, Displayable s) {
notifyDestroyed();
}
}
import javax.microedition.midlet.*;
import javax.microedition.media.*;
public class MediaInformationMIDlet extends MIDlet implements CommandListener {
private Form mInformationForm;
public void startApp() {
if (mInformationForm == null) {
mInformationForm =
new Form("Content types and protocols");
String[] contentTypes =
Manager.getSupportedContentTypes(null);
for (int i = 0; i < contentTypes.length; i++) {
String[] protocols =
Manager.getSupportedProtocols(contentTypes[i]);
for (int j = 0; j < protocols.length; j++) {
StringItem si = new StringItem(contentTypes[i] + ": ",
protocols[j]);
//si.setLayout(Item.LAYOUT_NEWLINE_AFTER);
mInformationForm.append(si);
}
}
Command exitCommand = new Command("Exit", Command.EXIT, 0);
mInformationForm.addCommand(exitCommand);
mInformationForm.setCommandListener(this);
}
Display.getDisplay(this).setCurrent(mInformationForm);
}
public void pauseApp() {}
public void destroyApp(boolean unconditional) {}
public void commandAction(Command c, Displayable s) {
notifyDestroyed();
}
}