如何自定义listview行android [英] how to customize listview row android

问题描述

我有一个姓名列表，我想根据名称开头的字母将颜色更改为行.这是我用来显示 ListView 的内容:

i have a names list and i want to change the color to the rows depending on the letter the name starts with. This is what i'm using to show the ListView:

ma​​in.xml

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

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

</LinearLayout>

lisviewrows.xml

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

ma​​in.java

public class Main extends Activity {
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);

        List<String> words = populateList();
        List<String> l = removeDoubles(words);
        Collections.sort(l);

        ListView lv = (ListView)findViewById(R.id.listview);

        ArrayAdapter<String> adapter = new ArrayAdapter<String>(getApplicationContext(), R.layout.listviewrows, l);

        lv.setAdapter(adapter);

        lv.setOnItemClickListener(new AdapterView.OnItemClickListener() {

            @Override
            public void onItemClick(AdapterView<?> arg0, View arg1, int arg2, long arg3) {

            }
        });
    }

您是否可以提供一些有用的链接或示例?

Is there some useful link you can provide me with or some example?

谢谢！！

推荐答案

为此，您需要创建自己的自定义适配器.在 getView 方法(返回要为每个列表项显示的视图)中，将您想要的颜色应用于 TextView 的背景.customAdapters 很酷的一点是你可以做任何事情，并为你的列表项显示更复杂的视图，因为你不再局限于 TextViews，你可以将你的列表项 XML 布局更改为任何类型的视图/布局...

To do so, you will need to create your own custom adapter. In the getView method (which returns the View to display for each list item), apply the color you want to your TextView's background. The cool thing about customAdapters is that you can do absolutely anything, and display much more complicated Views for your list items, because you are not restricted to TextViews anymore, you can change your list item XML layout to any kind of View/Layout...

像这样:

MyAdapter.java

public class MyAdapter extends BaseAdapter{
    private LayoutInflater inflater;
    private ArrayList<String> data;

    public MyAdapter(Context context, ArrayList<String> data){
    // Caches the LayoutInflater for quicker use
    this.inflater = LayoutInflater.from(context);
    // Sets the events data
    this.data= data;
    }

    public int getCount() {
        return this.data.size();
    }

    public String getItem(int position) throws IndexOutOfBoundsException{
        return this.data.get(position);
    }

    public long getItemId(int position) throws IndexOutOfBoundsException{
        if(position < getCount() && position >= 0 ){
            return position;
        }
    }

    public int getViewTypeCount(){
        return 1;
    }

    public View getView(int position, View convertView, ViewGroup parent){
        String myText = getItem(position);           

        if(convertView == null){ // If the View is not cached
            // Inflates the Common View from XML file
            convertView = this.inflater.inflate(R.id.my_row_layout, null);
        }

        // Select your color and apply it to your textview
        int myColor;
        if(myText.substring(0, 1) == "a"){
            myColor = Color.BLACK;
        }else{
        ....
        }

        convertView.findViewById(R.id.myTextViewId).setBackground(myColor);
        // Of course you will need to set the same ID in your item list XML layout.

        return convertView;
    }
}

然后在您的活动中像这样设置适配器:

and then in your activity set the adapter like this:

public class Main extends Activity {
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);

        List<String> words = populateList();
        List<String> l = removeDoubles(words);
        Collections.sort(l);

        ListView lv = (ListView)findViewById(R.id.listview);

        MyAdapter adapter = new MyAdapter(getApplicationContext(), l);

        lv.setAdapter(adapter);

        lv.setOnItemClickListener(new AdapterView.OnItemClickListener() {

            @Override
            public void onItemClick(AdapterView<?> arg0, View arg1, int arg2, long arg3) {

            }
        });
    }

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