Question

这是ACTIVITY_MAIN.XML

<LinearLayout
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:orientation="vertical" >

    <Spinner
        android:layout_margin="150dp"
        android:id="@+id/spinner1"
        android:layout_width="match_parent"
        android:layout_height="wrap_content" 
        android:entries="@array/colors_array"/>

</LinearLayout>

这是STRING.XML

<string name="app_name">ITMA133QUIZ</string>
<string name="action_settings">Settings</string>
<string name="hello_world">Hello world!</string>

<string-array name="colors_array">
    <item>Red</item>
    <item>Orange</item>
    <item>Yellow</item>
    <item>Green</item>
    <item>Blue</item>
    <item>Violet</item>
</string-array>

输出应该是当你在微调器上选择一个项目时，活动的背景应该改变......

我不知道如何在java中编写代码....

Answer 1

        spinner = (Spinner) view.findViewById(R.id.spinner1);
        ArrayAdapter<String> adapter = new ArrayAdapter<String>(getActivity(),
                android.R.layout.simple_spinner_item, getResources().getStringArray(R.array.colors_array));
        adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
        spinner.setAdapter(adapter);


        spinner.setOnItemSelectedListener(new OnItemSelectedListener() {

            public void onItemSelected(AdapterView<?> arg0, View view,
                    int position, long id) {

                   switch(position){
                      case 0: View view = this.getWindow().getDecorView();
                      view.setBackgroundColor(0xfff00000);
                      break;
                      and so on.....
                   }
            }
        }

请注意，这假设您的颜色位于 R.array文件夹中没有 - ＆gt;的strings.xml

Android：使用微调器更改主要活动背景颜色

1 个答案: