android泛型接口使用示例

//定义泛型接口
public interface HttpCallBack<T> {
    public void onSuccess(T result);
    public void onFail(Throwable throwable);
}

//定义父类子类model
public class ChildModel extends ParentModel {

    String result;

    public String getResult() {
        return result;
    }

    public void setResult(String result) {
        this.result = result;
    }
}

public class ParentModel {

    int statue;
    String message;

    public int getStatue() {
        return statue;
    }

    public void setStatue(int statue) {
        this.statue = statue;
    }

    public String getMessage() {
        return message;
    }

    public void setMessage(String message) {
        this.message = message;
    }
}

//定义接口与模型交互对象
public class MData<T> {
    public T model;
    public ArrayList<T> models;

    public T getModel() {
        return model;
    }

    public void setModel(T model) {
        this.model = model;
    }

    public ArrayList<T> getModels() {
        return models;
    }

    public void setModels(ArrayList<T> models) {
        this.models = models;
    }
}

//具体实现
public void getHttpData(final HttpCallBack<MData<? extends ParentModel>> callBack) {
    final Handler handler=new Handler() {
        @Override
        public void handleMessage(Message msg) {
            super.handleMessage(msg);
            if (msg.what==1) {
                ChildModel model=new ChildModel();
                model.setStatue(1);
                model.setMessage("ok");
                model.setResult("1234567");
                MData<ChildModel> mData=new MData<ChildModel>();
                mData.setModel(model);
                callBack.onSuccess(mData);
            }
            else {
                callBack.onFail(new RuntimeException("请求异常"));
            }
        }
    };

    new Thread(new Runnable() {
        @Override
        public void run() {
            Message message=new Message();
            //模拟http耗时
            try {
                message.what=1;
                Thread.sleep(5000);
            } catch (InterruptedException e) {
                e.printStackTrace();
                message.what=0;
            }
            handler.sendMessage(message);
        }
    }).start();
}

//使用
getHttpData(new HttpCallBack<MData<? extends ParentModel>>() {
    @Override
    public void onSuccess(MData<? extends ParentModel> result) {
        ChildModel model= (ChildModel) result.getModel();
        Toast.makeText(MainActivity.this, model.getResult(), Toast.LENGTH_LONG).show();
    }

    @Override
    public void onFail(Throwable throwable) {

    }
});