当我在我的三星 Galaxy S3(4.1.1)上运行我的 AsyncTask 类时,它运行得非常好,但是当我在我的 HTC Android(2.3.4)上运行它时,我收到以下错误。这里有什么问题?
这是课程。
public class enemyHandler extends AsyncTask<String, Integer, String>
{
@Override
protected String doInBackground(String... arg0) {
if(System.currentTimeMillis() - lastSpawn >= 2000)
{
Enemy x = new Enemy(SCREEN_WIDTH, SCREEN_HEIGHT, enemy.getHeight());
enemies.add(x);
lastSpawn = System.currentTimeMillis();
}
for(int i = 0; i < enemies.size(); i++)
{
Enemy tempE = enemies.get(i);
if(tempE.x <= 0 - enemy.getWidth())
enemies.remove(tempE);
}
return null;
}
}
日志输出:
03-14 18:04:53.656: E/AndroidRuntime(4279): FATAL EXCEPTION: Thread-12
03-14 18:04:53.656: E/AndroidRuntime(4279): java.lang.ExceptionInInitializerError
03-14 18:04:53.656: E/AndroidRuntime(4279): at com.jister13.plane.Main$SView.run(Main.java:188)
03-14 18:04:53.656: E/AndroidRuntime(4279): at java.lang.Thread.run(Thread.java:1027)
03-14 18:04:53.656: E/AndroidRuntime(4279): Caused by: java.lang.RuntimeException: Can't create handler inside thread that has not called Looper.prepare()
03-14 18:04:53.656: E/AndroidRuntime(4279): at android.os.Handler.<init>(Handler.java:121)
03-14 18:04:53.656: E/AndroidRuntime(4279): at android.os.AsyncTask$InternalHandler.<init>(AsyncTask.java:421)
03-14 18:04:53.656: E/AndroidRuntime(4279): at android.os.AsyncTask$InternalHandler.<init>(AsyncTask.java:421)
03-14 18:04:53.656: E/AndroidRuntime(4279): at android.os.AsyncTask.<clinit>(AsyncTask.java:152)
03-14 18:04:53.656: E/AndroidRuntime(4279): ... 2 more
解决方案:
我可以通过调用我的来解决这个问题
AsyncTask().execute("");
在 onCreate() 中创建类本身,然后在我希望它运行的地方调用它......