Android:从静态Handler类调用非静态方法

Question

鉴于此代码:

public class MainActivity extends FragmentActivity implements ActionBar.TabListener {

public static final int MESSAGE_NOT_CONNECTED = 1;

@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main_layout);
}

// -------------------------------------------------
public final void setStatus(int Rid) {
    final ActionBar actionBar = getActionBar();
    actionBar.setSubtitle(Rid);
}

// -------------------------------------------------
static Handler mHandler = new Handler() {
    @Override
    public void handleMessage(Message msg) {
        switch (msg.what) {
        case MESSAGE_NOT_CONNECTED:
            setStatus(R.string.title_not_connected);
            break;
        }
    }
}
}

我收到编译错误:无法对非静态方法setStatus(int)进行静态引用...

这是有道理的,因为setStatus()中的getActionBar()是一个非静态方法.

由于警告,我使Handler类保持静态:此Handler类应该是静态的,否则可能会发生泄漏.

问题:如何从静态处理程序中正确访问setStatus()方法？

编辑:新的处理程序代码是答案.

static class hHandler extends Handler {
    private final WeakReference<MainActivity> mTarget;
    hHandler(MainActivity target) {
        mTarget = new WeakReference<MainActivity>(target);
    }

    @Override
    public void handleMessage(Message msg) {
        MainActivity target = mTarget.get();
        If(target == null) {
             return;
        }
        switch (msg.what) {
        case MESSAGE_NOT_CONNECTED:
            target.setStatus(R.string.title_not_connected);
            break;
        }
    }
}

Answer 1

尝试使用a WeakReference,如本文所述.