java - 此处理程序类应该是静态的，否则可能会发生泄漏 : final Handler

Question

在下面的代码中，Eclipse 生成警告“This Handler class should be static or leaks might occur”。

public class MyActivity extends Activity implements Runnable
 {
   final Handler handler = new Handler()
    {
      @Override
      public void handleMessage( Message message)
       {
         String sResult = (String) message.obj;
         if( (sResult != null) && (sResult != ""))
           {
             MyNonStatic = (TableLayout) findViewById( R.id.tableLayout); // any non-static method
           }
         return;
       }
    };


   public void run()
    {
      final Message message = handler.obtainMessage( 1, MyFunction( context));
      handler.sendMessage( message);
    }

   public String MyFunction( Context context)
    {
      return "MyNewString";
    }
  }

我在网站上查看了很多主题，但没有找到解决方案。请帮助我获取此代码？

补充:我需要在handleMessage()中调用非静态方法(例如findViewById())!

Answer 1

下面是一个使用弱引用和静态处理程序类来解决 Lint 文档中推荐的问题的示例:

public class MyClass{

  //static inner class doesn't hold an implicit reference to the outer class
  private static class MyHandler extends Handler {
    //Using a weak reference means you won't prevent garbage collection
    private final WeakReference<MyClass> myClassWeakReference; 

    public MyHandler(MyClass myClassInstance) {
      myClassWeakReference = new WeakReference<MyClass>(myClassInstance);
    }

    @Override
    public void handleMessage(Message msg) {
      MyClass myClass = myClassWeakReference.get();
      if (myClass != null) {
        ...do work here...
      }
    }
  }

  private final MyHandler mHandler = new MyHandler(this);

  public MyHandler getHandler() {
    return new MyHandler(this);
  }
}