Question

我构建了具有4种布局的介绍性滑块。我想更改一张幻灯片中的TextView文本，但是代码不起作用（活动不知道任何视图）。我该怎么办？

IntroActivity.java：

public class IntroActivity extends AppIntro {

    @Override
    protected void onCreate (@Nullable Bundle savedInstanceState){
        super.onCreate(savedInstanceState);

        final LayoutInflater layoutInflater = getLayoutInflater();

        addSlide(IntroSlide.newInstance(R.layout.slide_layout1));
        addSlide(IntroSlide.newInstance(R.layout.slide_layout2));
        addSlide(IntroSlide.newInstance(R.layout.slide_layout3));
        addSlide(IntroSlide.newInstance(R.layout.slide_layout4));

        View view = layoutInflater.inflate(R.layout.slide_layout1,null);
        TextView tvSlide1 = view.findViewById(R.id.tvSlide1Title);
        tvSlide1.setText("Text changed!");

    }
}

IntroSlide.java：

public class IntroSlide extends Fragment {

    private static final String ARG_LAYOUT_RES_ID = "layoutResId";
    private int layoutResId;

    public static IntroSlide newInstance(int layoutResId) {
        IntroSlide introSlide = new IntroSlide();

        Bundle args = new Bundle();
        args.putInt(ARG_LAYOUT_RES_ID, layoutResId);
        introSlide.setArguments(args);

        return introSlide;
    }

    @Override
    public void onCreate(@Nullable Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        if (getArguments() != null && getArguments().containsKey(ARG_LAYOUT_RES_ID))
            layoutResId = getArguments().getInt(ARG_LAYOUT_RES_ID);
    }

    @Nullable
    @Override
    public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container,
    @Nullable Bundle savedInstanceState) {
        return inflater.inflate(layoutResId, container, false);
    }
}

Answer 1

如下所示修改您的“ onCreateView（）”

TextView tvSlide1;

@Nullable
@Override
public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container,
                         @Nullable Bundle savedInstanceState) {
    View view = inflater.inflate(layoutResId, container, false);
    tvSlide1 = view.findViewById(R.id.tvSlide1Title);  
}

public void setSlideText(String text){
    tvSlide1.setText(text);
}

并在您的 IntroActivity.java

中

IntroSlide slide1 = IntroSlide.newInstance(R.layout.slide_layout1)
addSlide(slide1);
slide1.setSlideText("some text");

如何在简介滑块中更改TextView文本？

1 个答案: