这是我希望显示自定义 View 的布局的 XML。

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:rs="http://schemas.android.com/apk/res/com.bookcessed.booksearch"
    android:id="@+id/widget273"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent" >

    <TextView
        android:id="@+id/csp_tv_title"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Choose Your Source"
        android:textSize="40sp"
        android:textColor="#ffc83200"
        android:gravity="center"
        android:paddingTop="15dip"
        android:paddingBottom="75dip"
        android:layout_alignParentTop="true"
        android:layout_centerHorizontal="true" />

    <com.bookcessed.booksearch.SearchProviderButton
        android:id="@+id/csp_spb_1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_centerHorizontal="true"
        android:layout_below="@+id/csp_tv_title"
        rs:providerName="BOOKP" />

</RelativeLayout>

这是自定义 View 的 XML:

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:rs="http://schemas.android.com/apk/res/com.bookcessed.booksearch"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content" >

    <RelativeLayout
        android:id="@+id/pv_rl_strings"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:gravity="center"
        android:layout_alignParentTop="true" >

        <TextView
            android:id="@+id/pv_tv_search"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="Search"
            android:layout_toRightOf="@+id/pv_tv_and"
            android:textSize="18sp"
            android:textColor="#ff11ab37"
            android:layout_alignParentTop="true" />

        <TextView
            android:id="@+id/pv_tv_and"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text=" and "
            android:textSize="18sp"
            android:paddingLeft="6dip"
            android:paddingRight="6dip"
            android:textColor="#ff000000"
            android:layout_centerHorizontal="true" />

        <TextView
            android:id="@+id/pv_tv_browse"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="Browse"
            android:textSize="18sp"
            android:textColor="#ff0077bb"
            android:layout_alignParentTop="true"
            android:layout_toLeftOf="@+id/pv_tv_and" />

        <ImageView
            android:id="@+id/pv_logo"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_below="@+id/pv_tv_search"
            android:layout_centerInParent="true"
            android:layout_alignTop="@+id/pv_tv_and"
            android:src="@drawable/bookp_logo" />

    </RelativeLayout>

    <RelativeLayout
        android:id="@+id/pv_rl_genres"
        android:layout_width="wrap_content"
        android:layout_below="@+id/pv_rl_strings"
        android:layout_height="wrap_content"
        android:layout_centerHorizontal="true" >

        <ImageView
            android:id="@+id/pv_genre1"
            android:layout_width="30dip"
            android:layout_height="30dip"
            android:layout_alignParentTop="true"
            android:layout_alignParentLeft="true" />

        <ImageView
            android:id="@+id/pv_genre2"
            android:layout_width="30dip"
            android:layout_height="30dip"
            android:layout_alignParentTop="true"
            android:layout_toRightOf="@+id/pv_genre1" />

        <ImageView
            android:id="@+id/pv_genre3"
            android:layout_width="30dip"
            android:layout_height="30dip"
            android:layout_alignParentTop="true"
            android:layout_toRightOf="@+id/pv_genre2" />

        <ImageView
            android:id="@+id/pv_genre4"
            android:layout_width="30dip"
            android:layout_height="30dip"
            android:layout_alignParentTop="true"
            android:layout_toRightOf="@+id/pv_genre3" />

        <ImageView
            android:id="@+id/pv_genre5"
            android:layout_width="30dip"
            android:layout_height="30dip"
            android:layout_alignParentTop="true"
            android:layout_toRightOf="@+id/pv_genre4" />

        <ImageView
            android:id="@+id/pv_genre6"
            android:layout_width="30dip"
            android:layout_height="30dip"
            android:layout_alignParentTop="true"
            android:layout_toRightOf="@+id/pv_genre5" />

        <ImageView
            android:id="@+id/pv_genre7"
            android:layout_width="30dip"
            android:layout_height="30dip"
            android:layout_alignParentTop="true"
            android:layout_toRightOf="@+id/pv_genre6" />

        <ImageView
            android:id="@+id/pv_genre8"
            android:layout_width="30dip"
            android:layout_height="30dip"
            android:layout_alignParentTop="true"
            android:layout_toRightOf="@+id/pv_genre7" />

        <ImageView
            android:id="@+id/pv_genre9"
            android:layout_width="30dip"
            android:layout_height="30dip"
            android:layout_alignParentTop="true"
            android:layout_toRightOf="@+id/pv_genre8" />

    </RelativeLayout>

</RelativeLayout>

这是 SearchProviderButton 类:

public class SearchProviderButton extends LinearLayout {

 private Connector connector;
 private Context context;
 private View inflatedView;

 public SearchProviderButton(Context context, AttributeSet attrs) {
   super(context, attrs);

  TypedArray a = getContext().obtainStyledAttributes(attrs,R.styleable.SearchProviderButton);
  connector = SearchProvider.valueOf(a.getString(R.styleable.SearchProviderButton_providerName)).getConnector();

  this.context = context;
  setFocusable(true);
  setBackgroundColor(Color.WHITE);
  setVisibility(VISIBLE);

  //setOnClickListener(listenerAdapter);
  setClickable(true);

 }



 @Override
 protected void onFinishInflate() {
  super.onFinishInflate();

  LayoutInflater li = LayoutInflater.from(context);
  inflatedView = li.inflate(R.layout.provider_view, null);


  ImageView logo = (ImageView)inflatedView.findViewById(R.id.pv_logo);
  logo.setImageResource(connector.getLogoDrawableID());


  TextView searchTV = (TextView)inflatedView.findViewById(R.id.pv_tv_search);
  TextView andTV = (TextView)inflatedView.findViewById(R.id.pv_tv_and);
  if(!connector.isSearchSupported()){
   andTV.setText("");
   searchTV.setVisibility(GONE);
  }

  setgenreIcons();
 }



 public Connector getConnector(){
  return connector;
 }

 public void setConnector(Connector connector){
  this.connector = connector;
 }


 private void setgenreIcons(){
  int[] genreIconDrawables = {R.id.pv_genre1,R.id.pv_genre2, R.id.pv_genre3,
    R.id.pv_genre4, R.id.pv_genre5, R.id.pv_genre6, R.id.pv_genre7, 
    R.id.pv_genre8, R.id.pv_genre9};  

  ArrayList<Genre> availgenre = connector.getAvailablegenres();
  availgenre.remove(Genre.ALL);

  int counter = 0;
  for(int genreIVid : genreIconDrawables){
   ImageView curgenreImageView = (ImageView)inflatedView.findViewById(genreIVid);
   if(counter < availgenre.size() - 1){
    curgenreImageView.setImageResource(availgenre.get(counter).getDrawable());
   } else {
    curgenreImageView.setVisibility(GONE);
   }
   counter++; 
  }
 }

 protected void onFocusChanged(boolean gainFocus, int direction, Rect previouslyFocusedRect) {
  if (gainFocus == true){
   this.setBackgroundColor(Color.rgb(255, 165, 0));
  } else {
   this.setBackgroundColor(Color.WHITE);
  }
 }


}

这是加载包含我的自定义组件的 xml 的类的代码:

bookPServiceProviderButton = (SearchProviderButton)findViewById(R.id.csp_spb_1);
bookPServiceProviderButton.setOnClickListener(SPBOnClickListener);
bookPServiceProviderButton.setConnector(new bookPConnector());
bookPServiceProviderButton.setVisibility(View.VISIBLE);

编辑:在第一条评论之后，我添加了这段代码:

@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
      super.onMeasure(widthMeasureSpec, heightMeasureSpec);
        int widthSpec = MeasureSpec.getMode(widthMeasureSpec);
        int width = MeasureSpec.getSize(widthMeasureSpec);
        int heightSpec = MeasureSpec.getMode(heightMeasureSpec);
        int height = MeasureSpec.getSize(heightMeasureSpec);

    setMeasuredDimension(width, height);

}

现在它有一个宽度和一个高度，但是里面什么都没有显示出来!

最佳答案

您的自定义布局 View 没有出现，因为您没有向其中添加任何内容。在你的onFinishInflate你有这条线 inflatedView = li.inflate(R.layout.provider_view, null);但是您不会将其添加到您的 View 中。您有两个选项可以将 View 添加到您的自定义布局 View 。

更改自定义 View 以扩展 RelativeLayout , 更改封闭的 RelativeLayout至 <merge> 在您的 provider_view.xml 中，修复您的 findViewId行到 this.findViewId(...)因为 View 会膨胀到您的布局中。

在您的布局 xml 中执行:

<com.bookcessed.booksearch.SearchProviderButton
android:id="@+id/csp_spb_1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerHorizontal="true"
android:layout_below="@+id/csp_tv_title"
rs:providerName="BOOKP">
    <!-- include this so it's added to your custom layout view -->
    <include layout="@layout/provider_view" />
</com.bookcessed.booksearch.SearchProviderButton>

provider_view 变成:

<?xml version="1.0" encoding="utf-8"?>
<merge
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:rs="http://schemas.android.com/apk/res/com.bookcessed.booksearch"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content" >
  <RelativeLayout
    android:id="@+id/pv_rl_strings"
  .
  .
  .
</merge>

搜索提供者按钮:

public class SearchProviderButton extends RelativeLayout{
 .
 .
 .

 @Override
 protected void onFinishInflate() {
  super.onFinishInflate();

  //the <include> in the layout file has added these views to this 
  //so search this for the views
  ImageView logo = this.findViewById(R.id.pv_logo);
  logo.setImageResource(connector.getLogoDrawableID());


  TextView searchTV = (TextView)this.findViewById(R.id.pv_tv_search);
  TextView andTV = (TextView)this.findViewById(R.id.pv_tv_and);
  if(!connector.isSearchSupported()){
   andTV.setText("");
   searchTV.setVisibility(GONE);
  }

  setgenreIcons();
 }
 .
 .
 .

或者您可以适本地膨胀 onCreate 中的 View 通过 layoutInflater.inflate(R.layout.provider_view, this, true) .该调用会将引用的布局膨胀到传递的 ViewGroup 中。 ，在本例中是您的自定义 View ，并添加膨胀的 View到它了。然后你可以修复 findViewId调用你的 onFinishInflate .

关于java - 自定义 View 未出现，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/3392351/