我正在为 Android 2.x 开发一款游戏。当玩家松手时,我想自动退出并返回到游戏的上一个菜单。这可能是一个简单的问题,但我该怎么做呢?
我有一个 MenuActivity,它调用 GameActivity,它调用游戏逻辑所在的 GameView(SurfaceView 的实现)。
更新:不,等等,它比这更复杂。为了制作这个游戏,我遵循了使用线程的 MoonLander 示例。
GameView:
public class GameActivity extends Activity
{
GameView gameView;
GameThread gThread;
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
gameView = new GameView(this);
setContentView(gameView);
gThread = gameView.getThread();
gThread.doStart();
}
}
GameView:
package com.cp.balldrop;
public class GameView extends SurfaceView implements SurfaceHolder.Callback
{
class GameThread extends Thread
{
public GameThread(SurfaceHolder sHolder, Context context, Handler handler)
{
//Code
}
public void doStart()
{
synchronized (mSurfaceHolder)
{
}
}
@Override
public void run()
{
while (running)
{
Canvas c = null;
try
{
c = mSurfaceHolder.lockCanvas(null);
synchronized (mSurfaceHolder)
{
doDraw(c);
}
}
finally
{
if (c != null)
{
mSurfaceHolder.unlockCanvasAndPost(c);
}
}
}
}
protected void doDraw(Canvas canvas)
{
//code
}
}
/** Handle to the application context, used to e.g. fetch Drawables. */
private Context mContext;
/** Pointer to the text view to display "Paused.." etc. */
private TextView mStatusText;
/** The thread that actually draws the animation */
private GameThread gThread;
public GameView(Context context)
{
super(context);
// register our interest in hearing about changes to our surface
SurfaceHolder holder = getHolder();
holder.addCallback(this);
// create thread only; it's started in surfaceCreated()
gThread = new GameThread(holder, context, new Handler()
{
@Override
public void handleMessage(Message m)
{
// mStatusText.setVisibility(m.getData().getInt("viz"));
// mStatusText.setText(m.getData().getString("text"));
}
});
setFocusable(true);
}
public GameThread getThread()
{
return gThread;
}
public void surfaceCreated(SurfaceHolder holder)
{
gThread.start();
}
@Override
public void surfaceDestroyed(SurfaceHolder holder)
{
boolean retry = true;
gThread.setRunning(false);
while (retry)
{
try
{
gThread.join();
retry = false;
}
catch (InterruptedException e)
{
}
}
}
}
在我的线程中,我从 SurfaceView 的 doTouch 调用以下方法:
public void doLose() {
synchronized (mSurfaceHolder) {
//quit to mainmenu
((Activity) mContext).finish();
}
}
这似乎关闭了表面视图和托管它的活动,将我带回到主菜单活动中。请注意转换和预定义的上下文。
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