android - 这个 Handler 类应该是静态的还是有泄漏？发生了什么？

Question

我是新手 android 程序员，我发现这个程序的句柄问题，当我尝试运行下面的程序时，它被强制关闭。

为什么会这样？？如何解决这个问题呢 ？？谢谢

public class Antivirus extends Activity {

    protected static final int STOP = 100;
    private ImageView iv;
    private ProgressBar pb;
    private LinearLayout ll;
    private AnimationDrawable anim;
    private ScrollView sv;
    private SQLiteDatabase db;
    private boolean flagscanning = false;
    private Handler handler = new Handler() {

        @Override
        public void handleMessage(Message msg) {
            super.handleMessage(msg);
             if(msg.what==STOP){
                 ll.removeAllViews();
                 anim.stop();

                 }
             String str = (String) msg.obj;
             TextView tv = new TextView(getApplicationContext());
             tv.setText(str);
             ll.setOrientation(LinearLayout.VERTICAL);
             ll.addView(tv);
             sv.scrollBy(0, 20);

            System.out.println(str);

        }

    };