java 获取参数泛型类型

import java.lang.reflect.ParameterizedType;

public abstract class SampleObjectCallBack<T> {
    private Class<T> clazz;

    @SuppressWarnings("unchecked")
    public SampleObjectCallBack() {
        ParameterizedType type = (ParameterizedType) this.getClass()
                .getGenericSuperclass();
        this.clazz = (Class<T>) type.getActualTypeArguments()[0];
    }

    public abstract void onSuccess(T t);

    public abstract void onError(int error, String msg);

    public Class<T> getClazz() {
        return clazz;
    }

}

用于（接口）回调中获取其泛型的类型。

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 String url = text;

            HMChatManager.getInstance().postByURL(url, null,
                    new SampleObjectCallBack<Friend>() {

                        @Override
                        public void onSuccess(Friend t) {
                            if (t != null) {
                                Log.d("", "" + t.toString());

                                Intent intent = new Intent(QRActivity.this,
                                        FriendDetailActivity.class);
                                intent.putExtra(FriendDetailActivity.KEY_ENTER,
                                        FriendDetailActivity.ENTER_SEARCH);
                                intent.putExtra(FriendDetailActivity.KEY_DATA,
                                        t);
                                startActivity(intent);

                                finish();
                            }
                        }

                        @Override
                        public void onError(int error, String msg) {
                            if (error == 200) {
                                ToastUtil.show(getApplicationContext(),
                                        "你扫描的用户不存在");
                                finish();
                            }
                        }
                    });

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