Question

我有LinearLayout（list_alphabet.xml），其中包含ListView和LinearLayout。方向未明确设置，因此是水平的。我希望ListView出现在左边，然后是第二个＆＃39; LinearLayout＆＃39; （它是垂直的）在它的右边，但实际上它们的顺序是相反的。布局将添加到MainActivity中的片段中如果有另外一段代码可以帮助我，请告诉我。

如何让它们按照它们在xml布局文件中出现的顺序显示？

MainActivity

public class MainActivity extends AppCompatActivity {

    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.list_alphabet);

        fragmentTransaction.add(R.id.list_alphabet_layout, new MyListFragment(), getResources().getString(R.string.list_fragment_tag));
        fragmentTransaction.commit();
        fragmentManager.executePendingTransactions();        
        ...   
    }

list_alphabet.xml

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

    <ListView
        android:id="@android:id/list"
        android:layout_width="0dp"
        android:layout_height="match_parent"
        android:layout_weight="1"
        android:fastScrollEnabled="true" />

    <LinearLayout
        android:id="@+id/sideIndex"
        android:layout_width="60dip"
        android:layout_height="fill_parent"
        android:gravity="center_horizontal"
        android:orientation="vertical" >
    </LinearLayout>

</LinearLayout>

这是副索引的Java代码：

    public void updateList() {

    // setup the side index (the column of letters)
    LinearLayout sideIndexLayout = (LinearLayout) getActivity().findViewById(R.id.sideIndex);

    sideIndexLayout.removeAllViews();
    indexListSize = alphabetList.size();
    if (indexListSize < 1) {
        return;
    }

    int indexMaxSize = (int) Math.floor(sideIndexLayout.getHeight() / 20);
    int tmpIndexListSize = indexListSize;
    while (tmpIndexListSize > indexMaxSize) {
        tmpIndexListSize = tmpIndexListSize / 2;
    }
    double delta;
    if (tmpIndexListSize > 0) {
        delta = indexListSize / tmpIndexListSize;
    }
    else {
        delta = 1;
    }

    TextView tempTextView;
    for (double i = 1; i <= indexListSize; i = i + delta) {
        Object[] tmpIndexItem = alphabetList.get((int) i - 1);
        String tmpLetter = tmpIndexItem[0].toString();

        tempTextView = new TextView(getActivity());
        tempTextView.setTextColor(getResources().getColor(android.R.color.white));
        tempTextView.setText(tmpLetter);
        tempTextView.setGravity(Gravity.CENTER);
        tempTextView.setTextSize(15);
        LinearLayout.LayoutParams params = new LinearLayout.LayoutParams(ViewGroup.LayoutParams.WRAP_CONTENT, ViewGroup.LayoutParams.WRAP_CONTENT, 1);
        tempTextView.setLayoutParams(params);
        sideIndexLayout.addView(tempTextView);
    }

    sideIndexHeight = sideIndexLayout.getHeight();

    sideIndexLayout.setOnTouchListener(new View.OnTouchListener() {
        @Override
        public boolean onTouch(View v, MotionEvent event) {
            sideIndexX = event.getX(); // coordinates of the touch
            sideIndexY = event.getY();

            // and can display a proper item in name list
            displayListItem();

            return false;
        }
    });
}

public void displayListItem() {
    LinearLayout sideIndexLayout = (LinearLayout) getActivity().findViewById(R.id.sideIndex);
    sideIndexLayout.setBackgroundColor(getResources().getColor(R.color.emnrd_green));
    sideIndexHeight = sideIndexLayout.getHeight();
    // compute number of pixels for every side index item
    double pixelPerIndexItem = (double) sideIndexHeight / indexListSize;

    // compute the item index for given event position belongs to
    int itemPosition = (int) (sideIndexY / pixelPerIndexItem);

    // get the item (we can do it since we know item index)
    if (itemPosition < alphabetList.size()) {
        Object[] indexItem = alphabetList.get(itemPosition);
        int subitemPosition = sectionMap.get(indexItem[0]);

        //ListView listView = (ListView) findViewById(android.R.id.list);
        getListView().setSelection(subitemPosition);
    }
}

Answer 1

抱歉无法发表评论，但这很有意思。解决方法可能是使用相对布局。只需将它们设置为正常，甚至可以进行设置，以便将listview设置为左侧。如果这不起作用那么有趣。

     <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
                android:id="@+id/list_alphabet_layout"
                android:layout_width="fill_parent"
                android:layout_height="fill_parent" >



    <LinearLayout
        android:id="@+id/sideIndex"
        android:layout_width="60dip"
        android:layout_alignParentRight="true"
        android:layout_height="fill_parent"
        android:gravity="center_horizontal"
        android:orientation="vertical" >
    </LinearLayout>

    <ListView
        android:id="@android:id/list"
        android:layout_width="match_parent"
        android:layout_marginRight="60dp"
        android:layout_alignParentLeft="true"
        android:layout_height="match_parent"
        android:fastScrollEnabled="true" />

</RelativeLayout>

Answer 2

几乎是@ Ashley所说的，但它似乎对我有用::

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

    <LinearLayout
        android:id="@+id/sideIndex"
        android:layout_width="150dp"
        android:layout_height="fill_parent"
        android:layout_alignParentRight="true"
        android:background="@color/material_blue_grey_800"
        android:gravity="center_horizontal"
        android:orientation="vertical"></LinearLayout>

    <ListView
        android:id="@android:id/list"
        android:layout_width="wrap_content"
        android:layout_height="match_parent"
        android:layout_alignParentLeft="true"
        android:layout_toLeftOf="@id/sideIndex"
        android:fastScrollEnabled="true" />

</RelativeLayout>

注意：在内部线性布局中添加内容后，请将宽度更改为 wrap_content 。

水平LinearLayout以相反的顺序显示组件

2 个答案: