13-7-12 android如何通过单击开始线程和停止线程

来源：互联网发布：java 输出helloworld 编辑：程序博客网时间：2024/05/21 11:22

通过单击事件开启线程后，再单击就会出现：

if(camThread != null){  //如果光 camThread.start()程序会报出camThread have startedif(camThread.isAlive())return;}camThread.start();

错误如下：

07-12 15:21:08.545: D/AndroidRuntime(9938): Shutting down VM07-12 15:21:08.545: W/dalvikvm(9938): threadid=1: thread exiting with uncaught exception (group=0x40a361f8)07-12 15:21:08.545: E/AndroidRuntime(9938): FATAL EXCEPTION: main07-12 15:21:08.545: E/AndroidRuntime(9938): java.lang.IllegalThreadStateException: Thread already started.07-12 15:21:08.545: E/AndroidRuntime(9938): at java.lang.Thread.start(Thread.java:1045)07-12 15:21:08.545: E/AndroidRuntime(9938): at com.homectrl.ui.Camera$clickBtn.onClick(Camera.java:149)07-12 15:21:08.545: E/AndroidRuntime(9938): at android.view.View.performClick(View.java:3511)07-12 15:21:08.545: E/AndroidRuntime(9938): at android.view.View$PerformClick.run(View.java:14105)07-12 15:21:08.545: E/AndroidRuntime(9938): at android.os.Handler.handleCallback(Handler.java:605)07-12 15:21:08.545: E/AndroidRuntime(9938): at android.os.Handler.dispatchMessage(Handler.java:92)07-12 15:21:08.545: E/AndroidRuntime(9938): at android.os.Looper.loop(Looper.java:137)07-12 15:21:08.545: E/AndroidRuntime(9938): at android.app.ActivityThread.main(ActivityThread.java:4424)07-12 15:21:08.545: E/AndroidRuntime(9938): at java.lang.reflect.Method.invokeNative(Native Method)07-12 15:21:08.545: E/AndroidRuntime(9938): at java.lang.reflect.Method.invoke(Method.java:511)07-12 15:21:08.545: E/AndroidRuntime(9938): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:790)07-12 15:21:08.545: E/AndroidRuntime(9938): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:557)07-12 15:21:08.545: E/AndroidRuntime(9938): at dalvik.system.NativeStart.main(Native Method)

错误，那怎么办，解决办法;

private Thread T1 = null;

if(T1 != null){   if(T1.isAlive())return;}T1 = new Thread(camThread);T1.start();

每次调用的时候从新实例化线程。这样每次start的时候就不会出现异常。