自定义视图中的Android findViewById()

Question

我编写了自定义视图,我希望在与自定义视图交互后更新其他一些视图.

主要布局:

<?xml version="1.0" encoding="utf-8"?>

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:custom="http://schemas.android.com/apk/res-auto"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <EditText
        android:id="@+id/display_name"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:inputType="text"
        android:layout_centerHorizontal="true"
        android:tag="name"
        android:ems="10" />

    <EditText
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:inputType="number"
        android:ems="10"
        android:id="@+id/id_number"
        android:layout_centerHorizontal="true"
        android:layout_below="@id/display_name"/>

    <ge.altasoft.custom_views.IdNumber
        android:id="@+id/custom_id_number"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_centerHorizontal="true"
        android:layout_below="@id/id_number"
        android:paddingLeft="35dip"
        custom:firstName="@id/display_name"/>
</RelativeLayout>

自定义视图布局:

<?xml version="1.0" encoding="utf-8"?>

<RelativeLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content">

    <EditText
        android:id="@+id/id_number_custom"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:inputType="number"
        android:ems="10"
        android:paddingRight="35dip" />

    <ImageButton
        android:id="@+id/load_data_button"
        android:layout_width="30dip"
        android:layout_height="30dip"
        android:layout_centerVertical="true"
        android:src="@drawable/load_data"
        android:layout_toRightOf="@id/id_number_custom" />

</RelativeLayout>

自定义视图类,构造函数和侦听器:

 private int firstNameViewID;

public IdNumber (Context context, AttributeSet attrs) {
        super(context, attrs);
        initViews();

        TypedArray a = context.obtainStyledAttributes(attrs, R.styleable.IdNumber);
        final int N = a.getIndexCount();
        for(int i = 0; i < N; i++){
            int attr = a.getIndex(i);
            switch(attr){
                case R.styleable.IdNumber_firstName:
                    firstNameViewID = a.getResourceId(attr, -1);
                    break;
            }
        }
        a.recycle();
    }



 private void initViews() {
        inflater = (LayoutInflater) getContext().getSystemService(Context.LAYOUT_INFLATER_SERVICE);
        inflater.inflate(R.layout.id_number_edit_text_custom, this, true);
        editText = (EditText) findViewById(R.id.id_number_custom);
        loadButton = (ImageButton) findViewById(R.id.load_data_button);
        loadButton.setVisibility(RelativeLayout.INVISIBLE);
        loadData();
    }

private void loadData(){
        loadButton.setOnClickListener(new OnClickListener() {
            @Override
            public void onClick(View v) {
                EditText firstName = (EditText) findViewById(R.id.display_name);
                firstName.setText("Some Text");
            }
        });
    }

问题是 EditText firstName = (EditText) findViewById(R.id.display_name);返回null.我知道只是调用findViewById()将在我给它充气的布局中搜索视图.

如果可能的话,如何从主布局获取带有id:display_name的EditText视图？

提前致谢.

Answer 1

View Custmv;

 private void initViews() {
        inflater = (LayoutInflater) getContext().getSystemService(Context.LAYOUT_INFLATER_SERVICE);
        Custmv = inflater.inflate(R.layout.id_number_edit_text_custom, this, true);
        editText = (EditText) findViewById(R.id.id_number_custom);
        loadButton = (ImageButton) findViewById(R.id.load_data_button);
        loadButton.setVisibility(RelativeLayout.INVISIBLE);
        loadData();
    }

private void loadData(){
        loadButton.setOnClickListener(new OnClickListener() {
            @Override
            public void onClick(View v) {
                EditText firstName = (EditText) Custmv.getParent().findViewById(R.id.display_name);
                firstName.setText("Some Text");
            }
        });
    }

试试这样.