J2ME中使用pauseApp控制手机临时退出JAVA程序
Midlet(即JAVA程序)处于活动状态时,应用程序管理器(手机操作系统)会因为某些情况要求程序暂停 ,比如手机突然来电 或者短消息 等。应用程序管理器为了节省更多的系统资源 ,会首先调用pauseApp方法释放一部分Midlet非必须的资源,然后再转换到暂停状态。所以一般在pauseApp()方法内应该添加释放资源的必需代码。
我在程序中使用状态参数控制游戏流程:
private static final int intGameWaiting = -1;
private static final int intGameReady = 0;
private static final int intGamePlaying = 1;
private static final int intGamePause = 2;
private static final int intGameWon = 3;
private static final int intGameEnd = 4;
private static final int intGameQuit = 5;
public int intGameStatus = -1;
public int intGameStatusReserve = -1;
protected void startApp() {
if(intGameStatus == intGamePause)
{
PlayCanvas = new clsPlayCanvas();
PlayCanvas.setFullScreenMode(true);
display.setCurrent(PlayCanvas);
intGameStatus = intGameStatusReserve;
PlayCanvas.continueGame();
}else{
MainCanvas = new clsMainCanvas();
MainCanvas.setFullScreenMode(true);
display.setCurrent(MainCanvas);
}
}
protected void pauseApp() {
//isGameWaiting = true;
if(intGameStatus!=intGameWaiting)
{
PlayCanvas = null;
intGameStatusReserve = intGameStatus;
intGameStatus = intGamePause;
}
}
这样就保证了程序在临时退出后返回继续游戏。
如果需要可以再设计一个PAUSE的CANVAS来过渡。