Handler洩漏處理

Handler的洩露處理：

public class BaseHandler<T> extends Handler {
    WeakReference<T> wr;     //弱引用
    BaseHandler.BaseHandlerCallBack callBack;

    public BaseHandler(T t,BaseHandler.BaseHandlerCallBack callBack){
        wr = new WeakReference<T>(t);
        AppLog.LOGE("Handler0:" + t);
        AppLog.LOGE("Handler1:" + wr);
        this.callBack = callBack;
    }

    @Override
    public void handleMessage(Message msg) {
        super.handleMessage(msg);
        T t = wr.get();//如果此方法為空, 那麼說明wr指向的物件已經被回收了.
        AppLog.LOGE("Handler:" + t);
        if(t != null){
            callBack.callBack(msg);
        }
    }

    public interface BaseHandlerCallBack {
        /**
         * 提供的BaseHandler的callback返回介面
         * @param msg  傳遞的Message資訊
         */
        void callBack(Message msg);
    }
}
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引用：

private Handler handler = new BaseHandler<>(UpLoadService.class, new BaseHandler.BaseHandlerCallBack() {
        @Override
        public void callBack(Message msg) {
           //do something
        }
    });
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