整个代码如下：

Question

我想创建两个微调器。

例如：（这是Spinner1中的列表）

Category A
Category B
Category C

当我在spinner1中选择类别A时，spinner2将显示类别A的值。

Answer 1

首先，您必须在XML中创建2个Spinner。

<Spinner
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:id="@+id/spinner1"
    android:layout_margin="10dp"
    android:padding="10dp"/>

<Spinner
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:id="@+id/spinner2"
    android:layout_margin="10dp"
    android:padding="10dp"/>

然后，您必须为Spinner声明变量。

final Spinner spinner1 = (Spinner)findViewById(R.id.spinner1);
final Spinner spinner2 = (Spinner)findViewById(R.id.spinner2);

现在，每个String[]需要一个Spinner，但是您想更改一个微调器的值，所以必须为每种情况创建一个String[]。

    String[] categories = new String[] {
            "Category A", "Category B", "Category C"
    };
    String[] category_a_values = new String[] {
            "Value 1 from category a", "Value 2 from category a", "Value 3 from category a"
    };
    String[] category_b_values = new String[] {
            "Value 1 from category b", "Value 2 from category b", "Value 3 from category b"
    };
    String[] category_c_values = new String[] {
            "Value 1 from category c", "Value 2 from category c", "Value 3 from category c"
    };

String[] 类别用于 spinner1 ，另一个用于 spinner2 。

现在我们每个ArrayAdapter需要一个String[]。

    final ArrayAdapter<String> categories_adapter = new ArrayAdapter<String>(this, android.R.layout.simple_spinner_item, categories);

    final ArrayAdapter<String> category_a_adapter = new ArrayAdapter<String>(this, android.R.layout.simple_spinner_item, category_a_values);
    final ArrayAdapter<String> category_b_adapter = new ArrayAdapter<String>(this, android.R.layout.simple_spinner_item, category_b_values);
    final ArrayAdapter<String> category_c_adapter = new ArrayAdapter<String>(this, android.R.layout.simple_spinner_item, category_c_values);

在这里，我们将ArrayAdapter设置为 spinner1 。

spinner1.setAdapter(categories_adapter);

然后，如果选择了 spinner1 的另一个值，则更改 spinner2 的ArrayAdapter。

spinner1.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
        @Override
        public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {
            switch (position) {
                case 0:
                    spinner2.setAdapter(category_a_adapter);
                    break;
                case 1:
                    spinner2.setAdapter(category_b_adapter);
                    break;
                case 2:
                    spinner2.setAdapter(category_c_adapter);
                    break;

                    default:


            }
        }

        @Override
        public void onNothingSelected(AdapterView<?> parent) {

        }
    });

整个代码如下：

final Spinner spinner1 = (Spinner)findViewById(R.id.spinner1);
    final Spinner spinner2 = (Spinner)findViewById(R.id.spinner2);


    String[] categories = new String[] {
            "Category A", "Category B", "Category C"
    };
    String[] category_a_values = new String[] {
            "Value 1 from category a", "Value 2 from category a", "Value 3 from category a"
    };
    String[] category_b_values = new String[] {
            "Value 1 from category b", "Value 2 from category b", "Value 3 from category b"
    };
    String[] category_c_values = new String[] {
            "Value 1 from category c", "Value 2 from category c", "Value 3 from category c"
    };
    final ArrayAdapter<String> categories_adapter = new ArrayAdapter<String>(this, android.R.layout.simple_spinner_item, categories);

    final ArrayAdapter<String> category_a_adapter = new ArrayAdapter<String>(this, android.R.layout.simple_spinner_item, category_a_values);
    final ArrayAdapter<String> category_b_adapter = new ArrayAdapter<String>(this, android.R.layout.simple_spinner_item, category_b_values);
    final ArrayAdapter<String> category_c_adapter = new ArrayAdapter<String>(this, android.R.layout.simple_spinner_item, category_c_values);

    spinner1.setAdapter(categories_adapter);

    spinner1.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
        @Override
        public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {
            switch (position) {
                case 0:
                    spinner2.setAdapter(category_a_adapter);
                    break;
                case 1:
                    spinner2.setAdapter(category_b_adapter);
                    break;
                case 2:
                    spinner2.setAdapter(category_c_adapter);
                    break;

                    default:


            }
        }

        @Override
        public void onNothingSelected(AdapterView<?> parent) {

        }
    });

Answer 2

Spinner spinner1 = findViewById(R.id.spinner_1);
Spinner spinner2 = findViewById(R.id.spinner_2);    

String[] arraySpinner = new String[] {
        "Category A", "Category B", "Category C"
};

String[] arraySpinner2 = new String[] {
        "Category A value", "Category B value", "Category C value"
};

ArrayAdapter<String> adp1 = new ArrayAdapter<String>(this,
                          android.R.layout.simple_spinner_item, arraySpinner);

adp1.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
spinner1.setAdapter(adp1);

ArrayAdapter<String> adp2 = new ArrayAdapter<String>(this,
                          android.R.layout.simple_spinner_item, arraySpinner2);

adp2.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
spinner2.setAdapter(adp2);

spinner1.setOnItemSelectedListener(new OnItemSelectedListener(){

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

        spinner2.setSelection(spinner1.getSelectedItemPosition());
    }

    @Override
    public void onNothingSelected(AdapterView<?> arg0) {


    }
});

我尚未测试此代码。有空的时候我会测试。

单击另一个微调器，在微调器中获得价值

2 个答案:

整个代码如下：