Question

大家好，请帮助一个刚开始学习android的Noob。基本上我有一个具有TextView的活动，在每个Textview上我都设置onfocusListener，一切都很完美。这是布局示例country UK的代码

<LinearLayout
        android:layout_width="fill_parent"
        android:layout_height="50.0dip"
        android:background="@drawable/button5_background">
        <ImageView
            android:layout_width="65dp"
            android:layout_height="104dp"
            android:id="@+id/afrflag"
            android:layout_gravity="center_vertical"
            android:src="@drawable/ukflag" />
        <TextView
            android:background="@drawable/custom_selector"
            android:id="@+id/uk"
            android:layout_width="fill_parent"
            android:layout_height="match_parent"
            android:gravity="center"

            android:text="@string/uk"
            android:textColor="@color/white"
            android:textSize="18.0sp"
            android:focusable="true"
            android:focusableInTouchMode="true" />
    </LinearLayout>

这里是英国的代码OnFocusChangeListener

TextView btnuk = (TextView) findViewById(R.id.uk);
    btnuk.setOnFocusChangeListener(new View.OnFocusChangeListener() {
        @Override
        public void onFocusChange(View v, boolean hasFocus) {
            // TODO Auto-generated method stub
            if (hasFocus) {
                videoList.clear();
                fetchVideouk();
            }
        }

    });

所以我决定玩游戏并制作arrays.xml并将所有国家放在那里，然后尝试使用listview而不是TextView，我必须创建这么多行作为按钮。

这是我的array.xml

    <string-array
        name="countryView">
        <item>@string/uk</item>
        <item>@string/frn</item>
        <item>@string/ita</item>
        <item>@string/ger</item>

    </string-array>
</resources>

和listview的xml

<LinearLayout
        android:layout_width="fill_parent"
        android:layout_height="fill_parent"
        android:background="@drawable/custom_selector">

        <ListView
            android:background="@drawable/button5_background"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:id="@+id/country_names"
            android:entries="@array/countryView"
            />
    </LinearLayout>

使用上面的代码我看到国家名称加载在我的视图上，但我不知道如何在每个项目（国家/地区）上设置onfocus

ListView listView;
    String[] uk;


    uk = getResources().getStringArray(R.array.countryView);

    listView = (ListView) findViewById(R.id.country_names);

    ArrayAdapter<String> adapter = new ArrayAdapter<>(this, android.R.layout.simple_list_item_1, uk);
    listView.setAdapter(adapter);


    listView.setOnFocusChangeListener(new View.OnFocusChangeListener() {
        @Override
        public void onFocusChange(View v, boolean hasFocus) {
            // TODO Auto-generated method stub
            if (hasFocus) {
                videoList.clear();
                fetchVideosuk();
            }
        }

    });

如何为下一个项目设置onfocus呢？例如ger，Ita等我确定这不正确，但我不明白怎么做？

Answer 1

您必须为此创建自定义适配器。

<强> row_layout.xml

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

    <TextView
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:id="@+id/textView"
        android:textSize="20sp"/>

</LinearLayout>

<强> MyAdapter.java

import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.TextView;

public class MyAdapter extends ArrayAdapter<String> {

    public MyAdapter(Context context, String[] values){
        super(context, R.layout.row_layout, values);
    }


    @Override
    public View getView(int position, View convertView, ViewGroup parent) {

        LayoutInflater inflater = LayoutInflater.from(getContext());

        View view = inflater.inflate(R.layout.row_layout, parent, false);

        TextView textView = (TextView) view.findViewById(R.id.textView);
        textView.setText(getItem(position));

        return view;
    }
}

您可以通过MainActivty.java中的以下代码执行此操作：

uk = getResources().getStringArray(R.array.countryView);
listView = (ListView) findViewById(R.id.country_names);

ArrayAdapter<String> adapter = new MyAdapter(this, uk);
listView.setAdapter(adapter);

for (int i=0; i<listView.getChildCount(); i++) {
    TextView textView = (TextView) listView.getChildAt(i).findViewById(R.id.textView);
    textView.setOnFocusChangeListener(new View.OnFocusChangeListener() {
        @Override
        public void onFocusChange(View view, boolean hasFocus) {
            if (hasFocus) {
                // do something //
            }
        }
    });
}

我希望这有用。

如何在数组列表项xml上ListView OnFocusChangeListener

1 个答案: