Question

我有一个包含一个列表视图的相对视图。我在运行时创建这个相对视图，并将内容（基本上是一个字符串数组）添加到我的列表视图中。我已将listview的宽度和高度设置为“wrap_content”。问题是我的列表父亲相对视图没有调整大小以显示我的列表视图。它只显示列表的第一个值。我明白我必须覆盖onmeasure方法。那么，我怎样才能在onmeasure方法中获得listview的高度，这样我就可以将它传递给我的父视图我已经阅读了很多像这样的问题但却无法正常工作。

另外一件事getMeasuredHeight（）在我的onmeasure（）方法中返回0。

更新

我的主要布局activity_main

<ScrollView xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:id="@+id/layout_route_search"
android:layout_width="match_parent"
android:layout_height="match_parent" >

<RelativeLayout
    android:id="@+id/layout_main"
    android:layout_width="match_parent"
    android:layout_height="wrap_content" >
</RelativeLayout>

</ScrollView>

lo_block.xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical" >

<TextView
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:text="Text_view" />

<ListView
    android:id="@+id/listView1"
    android:layout_width="match_parent"
    android:layout_height="wrap_content" />

</RelativeLayout>

这是我的代码
Frag.java

public class Frag extends Fragment {

private View mView;

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

    mView = inflater.inflate(R.layout.activity_main, null);

    showView();
    return mView;
}

public void showView() {

    block card = new block(getActivity());

    LayoutParams params = new LayoutParams(LayoutParams.MATCH_PARENT,
            LayoutParams.WRAP_CONTENT);

    card.setLayoutParams(params);
    ViewGroup vg = (ViewGroup) mView.findViewById(R.id.layout_main);
    vg.addView(card);
}

private class block extends RelativeLayout {

// int listViewh = 0; // private float listViewHeight;

    public block(Context context) {
        super(context);

        View mView = View.inflate(getContext(), R.layout.lo_block, this);

        ListView lst = (ListView) mView.findViewById(R.id.listView1);
        ArrayAdapter<String> adapter = new ArrayAdapter<String>(
                getActivity(), android.R.layout.simple_list_item_1,
                new String[] { "ad", "sfsd", "sfsf", "asfsfs" });

        lst.setAdapter(adapter);
    }

    public block(Context context, AttributeSet attrs, int defStyle) {

        super(context, attrs, defStyle);

    }

    @Override
    public int getMinimumHeight() {

        return super.getMinimumHeight();
    }

    @Override
    protected void onSizeChanged(int w, int h, int oldw, int oldh) {
        super.onSizeChanged(w, h, oldw, oldh);

    }

    @Override
    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {

        super.onMeasure(widthMeasureSpec, heightMeasureSpec);

        int w = MeasureSpec.getSize(widthMeasureSpec);
        int h = MeasureSpec.getSize(heightMeasureSpec);

// setMeasuredDimension（w，h）; }

}

main.xml中

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/fragment"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical" >

</LinearLayout>

我的主要活动公共类MainActivity扩展了Activity {

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);

    getFragmentManager().beginTransaction().replace(R.id.fragment,
            new Frag()).commit();
}

@Override
public boolean onCreateOptionsMenu(Menu menu) {
    // Inflate the menu; this adds items to the action bar if it is present.
    getMenuInflater().inflate(R.menu.main, menu);
    return true;
}


}

Answer 1

在我的案例中，确切的问题是我试图将 listview置于scrollview内。，并且通常是 NOT RECOMMENDED 。但我设法扩展了我的列表视图。虽然它不能滚动它以前更好。下面是我在构造函数中添加的代码

ListView lst = (ListView) mView.findViewById(R.id.listView1);
        String[] arrayList = new String[] { "ad", "sfsd", "sfsf", "asfsfs",
                "ssfsff", "llkllk", "4323" };

        ArrayAdapter<String> adapter = new ArrayAdapter<String>(
                getActivity(), android.R.layout.simple_list_item_1,
                arrayList);
        int totalHeight = 0;
        for (int i = 0; i < adapter.getCount(); i++) {
            View listItem = adapter.getView(i, null, lst);
            listItem.measure(0, 0);
            totalHeight += listItem.getMeasuredHeight();
        }
        LayoutParams lp = (LayoutParams) lst.getLayoutParams();
        int height = totalHeight;

        // arraylist list is in which all data is kept

        lp.height = height;
        lst.setLayoutParams(lp);

        lst.setAdapter(adapter);

如何更改父视图的高度以适合子视图

1 个答案: