java - SurfaceView和线程已经启动异常

Question

检查 LunarLander 示例，它使用该代码来恢复抽屉线程:

public void surfaceCreated(SurfaceHolder holder) {
    // start the thread here so that we don't busy-wait in run()
    // waiting for the surface to be created
    thread.setRunning(true);
    thread.start();
}

结束:

public void surfaceDestroyed(SurfaceHolder holder) {
    // we have to tell thread to shut down & wait for it to finish, or else
    // it might touch the Surface after we return and explode
    boolean retry = true;
    thread.setRunning(false);
    while (retry) {
        try {
            thread.join();
            retry = false;
        } catch (InterruptedException e) {
        }
    }
}

但是当我执行该项目时，按主页按钮并恢复崩溃的应用程序

 java.lang.IllegalThreadStateException: Thread already started.
    at java.lang.Thread.start(Thread.java:1045)
    at com.example.android.lunarlander.LunarView.surfaceCreated(LunarView.java:862)
    at android.view.SurfaceView.updateWindow(SurfaceView.java:533)
    at android.view.SurfaceView.onWindowVisibilityChanged(SurfaceView.java:226)
    at android.view.View.dispatchWindowVisibilityChanged(View.java:5839)
    at android.view.ViewGroup.dispatchWindowVisibilityChanged(ViewGroup.java:945)
    at android.view.ViewGroup.dispatchWindowVisibilityChanged(ViewGroup.java:945)
    at android.view.ViewGroup.dispatchWindowVisibilityChanged(ViewGroup.java:945)
    at android.view.ViewGroup.dispatchWindowVisibilityChanged(ViewGroup.java:945)

我在其他示例中看到过这种处理后台线程的方法，但它崩溃了。它有什么问题吗？

Answer 1

你的线程仍在运行，我猜你没有正确停止它。 你必须中断你的线程，否则我就是这样解决的。因此，不要使用 setRunning 和 boolean 值来使线程运行，而是使用如下所示的内容:

启动它:

public void surfaceCreated(SurfaceHolder holder) {
    thread.start();
}

在线程中:

public void run() {

    try {
        while (true) {
            // code here
        }
    }
    catch (InterruptedException e) {
         //disable stuff here
    }
}

并阻止它:

public void surfaceDestroyed(SurfaceHolder holder) {
    thread.interrupt();
}

我刚刚快速输入了此内容，但它应该可以给您一个想法。