如何使用ButterKnife注入ViewStub？

Question

我想使用ViewStub和ButterKnife，这是我所做的：

public class ExampleFragment extends Fragment {

    @InjectView ( R.id.stub )
    ViewStub mStub;

    /* A TextView in the ViewStub */
    @InjectView ( R.id.text )
    @Optional
    TextView mText;

    @Override
    public View onCreateView ( LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState ) {

        View rootView = inflater.inflate ( R.layout.rootview, container, false );
        ButterKnife.inject ( this, rootView );

        mStub.setLayoutResource ( R.layout.stub_layout );
        View inflated = mStub.inflate ();
        ButterKnife.inject ( mStub, inflated );

        mText.setText("test.");    

        return rootView;
    }
}

日志显示：

mText 是一个空对象引用

我现在毫无头绪，欢迎任何建议。谢谢！

- RockerFlower

---

尝试使用以下代码：View inflated = mStub.inflate(); ButterKnife.inject(this, inflated); - Nikola Despotoski

@NikolaDespotoski 我已经尝试过了，这个注入替换了第一个注入ButterKnife.inject ( this, rootView );，所以mStub变成了null。现在我使用TextView mText = ( TextView ) inflated.findViewById ( R.id.text );代替了:( 无论如何还是谢谢！ - RockerFlower

@RockerFlower，加载布局后为什么还需要ViewStub对象呢？ - Renascienza

Answer 1

你可以创建一个嵌套类，将视图放在存根内部。

public class ExampleFragment extends Fragment {

    @InjectView ( R.id.stub )
    ViewStub mStub;

    @Override
    public View onCreateView ( LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState ) {

        View rootView = inflater.inflate ( R.layout.rootview, container, false );
        ButterKnife.inject ( this, rootView );

        mStub.setLayoutResource ( R.layout.stub_layout );
        View inflated = mStub.inflate ();
        MyStubView stubView = new MyStubView(inflated); 
        stubView.mText.setText("test.");    

        return rootView;
    }

    // class (inner in this example) that has stuff from your stub
    public class MyStubView {
        @InjectView(R.id.text)
        TextView mText;

        public MyStubView(View view) {
            Butterknife.inject(this, view);
        }
    }
}

- JChord

Answer 2

这里是Jake针对此请求的回答：

创建一个嵌套类，将视图放在存根中，然后使用viewstub作为根，在该类的实例上调用inject。

有关代码，请参阅此Github问题。

- CodeFury