Handler使用弱引用优化

定义一个DefaultHandler类

public abstract class DefaultHandler<T> extends Handler {

    protected final WeakReference<Fragment> mReference;
    protected final WeakReference<T> mReferenceT;

    public DefaultHandler(Fragment context, T t) {
        mReference = new WeakReference<>(context);
        mReferenceT = new WeakReference<>(t);
    }

    @Override
    public final void handleMessage(Message msg) {
        super.handleMessage(msg);
        Fragment context = mReference.get();
        if (context != null) {
            if (context instanceof Fragment && ((Activity) context.getActivity()).isFinishing()) {
                removeCallbacksAndMessages();
            } else {
                T t = mReferenceT.get();
                if (t != null) {
                    this.handleMessage(msg, t);
                } else {
                }
            }
        } else {
            removeCallbacksAndMessages();
        }
    }

    public abstract void handleMessage(Message msg, T t);

    public void removeCallbacksAndMessages() {
        removeCallbacksAndMessages(null);
        mReference.clear();
        mReferenceT.clear();
    }

}

在fragmeng中引用

private VerifyHandler handler = new VerifyHandler(this, this);

    private static class VerifyHandler extends DefaultHandler<WellControlMonitorFragment> {
        public VerifyHandler(WellControlMonitorFragment context, WellControlMonitorFragment fragment) {
            super(context, fragment);
        }

        @Override
        public void handleMessage(Message msg, WellControlMonitorFragment fragment) {
            if (msg.obj instanceof RunControlInfo) {
                RunControlInfo controlInfo = (RunControlInfo) msg.obj;
                fragment.showCurrentData(controlInfo.getTnm(), controlInfo.getVal() + "");
            } else {
                for (int i = 0; i < fragment.tempData.getData().getData().size(); i++) {
                    fragment.showCurrentData(fragment.tempData.getData().getData().get(i).getTnm(), fragment.tempData.getData().getData().get(i).getVal() + "");
                }
            }
        }
    }

       Message msg = Message.obtain();
            msg.obj = runControlInfo;
            handler.sendMessage(msg);