Java-按微调器更改微调器的值

我试图使一个微调器（2）更改另一个微调器（1）的内容

我当前在第二个微调器的数组适配器中遇到一个错误“错误：（28，57）错误：无法推断ArrayAdapter的类型参数”

这是我的密码：

导入android.support.v7.app.app活动；
导入android.os.Bundle；
导入android.view.view；
导入android.widget.AdapterView；
导入android.widget.ArrayAdapter；
导入android.widget.Spinner；
公共类详细信息窗体扩展了AppCompatActivity{
@凌驾
创建时受保护的void（Bundle savedInstanceState）{
super.onCreate（savedInstanceState）；
setContentView（R.layout.details_表单）；
最终微调器carBrand=（微调器）findViewById（R.id.carBrand）；
字符串[]项=新字符串[]{“本田”、“日产”、“丰田”}；
ArrayAdapter=新的ArrayAdapter（这个，android.R.layout.simple\u微调器\u下拉菜单\u项，项）；
carBrand.setAdapter（适配器）；
carBrand.setOnItemSelectedListener（新的AdapterView.OnItemSelectedListener（）{
@凌驾
已选择公共视图（AdapterView父视图、视图视图、整型位置、长id）{
字符串carBrand=parent.getSelectedItem（）.toString（）；
if（卡伯兰等于（“日产”））{
最终微调器模型=（微调器）findViewById（R.id.model）；
字符串[]模型=新字符串[]{“S14”、“R34”、“240SX”}；
ArrayAdapter modeladapter=新的ArrayAdapter（这是android.R.layout.simple\u微调器\u下拉菜单\u项，模型）；
model.setAdapter（modeladapter）；
}否则如果（卡布兰等于（“本田”））{
微调器模型=（微调器）findViewById（R.id.model）；
字符串[]模型=新字符串[]{“Civic”、“NSX”、“Accord”}；
ArrayAdapter modeladapter=新的ArrayAdapter（这是android.R.layout.simple\u微调器\u下拉菜单\u项，模型）；
model.setAdapter（modeladapter）；
}否则，如果（卡布兰等于（“丰田”））{
微调器模型=（微调器）findViewById（R.id.model）；
字符串[]模型=新字符串[]{“Supra”、“AE86”、“GT86”}；
ArrayAdapter modeladapter=新的ArrayAdapter（这是android.R.layout.simple\u微调器\u下拉菜单\u项，模型）；
model.setAdapter（modeladapter）；
}
}
@凌驾
未选择公共无效（AdapterView父级）{
}
});

任何帮助都将不胜感激。

更改您的代码

发件人：

        @Override
        public void onItemSelected(AdapterView<?> parent, View view, int position, long id){
            String carBrand = parent.getSelectedItem().toString();
            if (carBrand.equals("Nissan")) {
                final Spinner model = (Spinner) findViewById(R.id.model);
                String[] models = new String[]{"S14", "R34", "240SX"};
                ArrayAdapter<String> modeladapter = new ArrayAdapter<>(this, android.R.layout.simple_spinner_dropdown_item, models);
                model.setAdapter(modeladapter);

            } else if (carBrand.equals("Honda")) {
                Spinner model = (Spinner) findViewById(R.id.model);
                String[] models = new String[]{"Civic", "NSX", "Accord"};
                ArrayAdapter<String> modeladapter = new ArrayAdapter<>(this, android.R.layout.simple_spinner_dropdown_item, models);
                model.setAdapter(modeladapter);
            } else if (carBrand.equals("Toyota")) {
                Spinner model = (Spinner) findViewById(R.id.model);
                String[] models = new String[]{"Supra", "AE86", "GT86"};
                ArrayAdapter<String> modeladapter = new ArrayAdapter<>(this, android.R.layout.simple_spinner_dropdown_item, models);
                model.setAdapter(modeladapter);
            }
        }

        @Override
        public void onItemSelected(AdapterView<?> parent, View view, int position, long id){
            String carBrand = parent.getSelectedItem().toString();
            if (carBrand.equals("Nissan")) {
                final Spinner model = (Spinner) findViewById(R.id.model);
                String[] models = new String[]{"S14", "R34", "240SX"};
                ArrayAdapter<String> modeladapter = new ArrayAdapter<>(YourActivity.this, android.R.layout.simple_spinner_dropdown_item, models);
                model.setAdapter(modeladapter);

            } else if (carBrand.equals("Honda")) {
                Spinner model = (Spinner) findViewById(R.id.model);
                String[] models = new String[]{"Civic", "NSX", "Accord"};
                ArrayAdapter<String> modeladapter = new ArrayAdapter<>(YourActivity.this, android.R.layout.simple_spinner_dropdown_item, models);
                model.setAdapter(modeladapter);
            } else if (carBrand.equals("Toyota")) {
                Spinner model = (Spinner) findViewById(R.id.model);
                String[] models = new String[]{"Supra", "AE86", "GT86"};
                ArrayAdapter<String> modeladapter = new ArrayAdapter<>(YourActivity.this, android.R.layout.simple_spinner_dropdown_item, models);
                model.setAdapter(modeladapter);
            }
        }

@覆盖
已选择公共视图（AdapterView父视图、视图视图、整型位置、长id）{
字符串carBrand=parent.getSelectedItem（）.toString（）；
if（卡伯兰等于（“日产”））{
最终微调器模型=（微调器）findViewById（R.id.model）；
字符串[]模型=新字符串[]{“S14”、“R34”、“240SX”}；
ArrayAdapter modeladapter=新的ArrayAdapter（这是android.R.layout.simple\u微调器\u下拉菜单\u项，模型）；
model.setAdapter（modeladapter）；
}否则如果（卡布兰等于（“本田”））{
微调器模型=（微调器）findViewById（R.id.model）；
字符串[]模型=新字符串[]{“Civic”、“NSX”、“Accord”}；
ArrayAdapter modeladapter=新的ArrayAdapter（这是android.R.layout.simple\u微调器\u下拉菜单\u项，模型）；
model.setAdapter（modeladapter）；
}否则，如果（卡布兰等于（“丰田”））{
微调器模型=（微调器）findViewById（R.id.model）；
字符串[]模型=新字符串[]{“Supra”、“AE86”、“GT86”}；
ArrayAdapter modeladapter=新的ArrayAdapter（这是android.R.layout.simple\u微调器\u下拉菜单\u项，模型）；
model.setAdapter（modeladapter）；
}
}

至：

        @Override
        public void onItemSelected(AdapterView<?> parent, View view, int position, long id){
            String carBrand = parent.getSelectedItem().toString();
            if (carBrand.equals("Nissan")) {
                final Spinner model = (Spinner) findViewById(R.id.model);
                String[] models = new String[]{"S14", "R34", "240SX"};
                ArrayAdapter<String> modeladapter = new ArrayAdapter<>(this, android.R.layout.simple_spinner_dropdown_item, models);
                model.setAdapter(modeladapter);

            } else if (carBrand.equals("Honda")) {
                Spinner model = (Spinner) findViewById(R.id.model);
                String[] models = new String[]{"Civic", "NSX", "Accord"};
                ArrayAdapter<String> modeladapter = new ArrayAdapter<>(this, android.R.layout.simple_spinner_dropdown_item, models);
                model.setAdapter(modeladapter);
            } else if (carBrand.equals("Toyota")) {
                Spinner model = (Spinner) findViewById(R.id.model);
                String[] models = new String[]{"Supra", "AE86", "GT86"};
                ArrayAdapter<String> modeladapter = new ArrayAdapter<>(this, android.R.layout.simple_spinner_dropdown_item, models);
                model.setAdapter(modeladapter);
            }
        }

        @Override
        public void onItemSelected(AdapterView<?> parent, View view, int position, long id){
            String carBrand = parent.getSelectedItem().toString();
            if (carBrand.equals("Nissan")) {
                final Spinner model = (Spinner) findViewById(R.id.model);
                String[] models = new String[]{"S14", "R34", "240SX"};
                ArrayAdapter<String> modeladapter = new ArrayAdapter<>(YourActivity.this, android.R.layout.simple_spinner_dropdown_item, models);
                model.setAdapter(modeladapter);

            } else if (carBrand.equals("Honda")) {
                Spinner model = (Spinner) findViewById(R.id.model);
                String[] models = new String[]{"Civic", "NSX", "Accord"};
                ArrayAdapter<String> modeladapter = new ArrayAdapter<>(YourActivity.this, android.R.layout.simple_spinner_dropdown_item, models);
                model.setAdapter(modeladapter);
            } else if (carBrand.equals("Toyota")) {
                Spinner model = (Spinner) findViewById(R.id.model);
                String[] models = new String[]{"Supra", "AE86", "GT86"};
                ArrayAdapter<String> modeladapter = new ArrayAdapter<>(YourActivity.this, android.R.layout.simple_spinner_dropdown_item, models);
                model.setAdapter(modeladapter);
            }
        }

@覆盖
已选择公共视图（AdapterView父视图、视图视图、整型位置、长id）{
字符串carBrand=parent.getSelectedItem（）.toString（）；
if（卡伯兰等于（“日产”））{
最终微调器模型=（微调器）findViewById（R.id.model）；
字符串[]模型=新字符串[]{“S14”、“R34”、“240SX”}；
ArrayAdapter modeladapter=新的ArrayAdapter（YourActivity.this，android.R.layout.simple\u微调器\u下拉菜单\u项，模型）；
model.setAdapter（modeladapter）；
}否则如果（卡布兰等于（“本田”））{
微调器模型=（微调器）findViewById（R.id.model）；
字符串[]模型=新字符串[]{“Civic”、“NSX”、“Accord”}；
ArrayAdapter modeladapter=新的ArrayAdapter（YourActivity.this，android.R.layout.simple\u微调器\u下拉菜单\u项，模型）；
model.setAdapter（modeladapter）；
}否则，如果（卡布兰等于（“丰田”））{
微调器模型=（微调器）findViewById（R.id.model）；
字符串[]模型=新字符串[]{“Supra”、“AE86”、“GT86”}；
ArrayAdapter modeladapter=新的ArrayAdapter（YourActivity.this，android.R.layout.simple\u微调器\u下拉菜单\u项，模型）；
model.setAdapter（modeladapter）；
}
}

YourActivity

是您的

activity

类名。此更改是必要的，因为在

OnItemSelectedListener

中，

此

表示侦听器的对象，它的类型与

上下文

不同，您需要

上下文

或

activity

的对象引用来调用

数组IDapter

构造函数。此解决方案应该适合您。

更改您的代码

发件人：

        @Override
        public void onItemSelected(AdapterView<?> parent, View view, int position, long id){
            String carBrand = parent.getSelectedItem().toString();
            if (carBrand.equals("Nissan")) {
                final Spinner model = (Spinner) findViewById(R.id.model);
                String[] models = new String[]{"S14", "R34", "240SX"};
                ArrayAdapter<String> modeladapter = new ArrayAdapter<>(this, android.R.layout.simple_spinner_dropdown_item, models);
                model.setAdapter(modeladapter);

            } else if (carBrand.equals("Honda")) {
                Spinner model = (Spinner) findViewById(R.id.model);
                String[] models = new String[]{"Civic", "NSX", "Accord"};
                ArrayAdapter<String> modeladapter = new ArrayAdapter<>(this, android.R.layout.simple_spinner_dropdown_item, models);
                model.setAdapter(modeladapter);
            } else if (carBrand.equals("Toyota")) {
                Spinner model = (Spinner) findViewById(R.id.model);
                String[] models = new String[]{"Supra", "AE86", "GT86"};
                ArrayAdapter<String> modeladapter = new ArrayAdapter<>(this, android.R.layout.simple_spinner_dropdown_item, models);
                model.setAdapter(modeladapter);
            }
        }

        @Override
        public void onItemSelected(AdapterView<?> parent, View view, int position, long id){
            String carBrand = parent.getSelectedItem().toString();
            if (carBrand.equals("Nissan")) {
                final Spinner model = (Spinner) findViewById(R.id.model);
                String[] models = new String[]{"S14", "R34", "240SX"};
                ArrayAdapter<String> modeladapter = new ArrayAdapter<>(YourActivity.this, android.R.layout.simple_spinner_dropdown_item, models);
                model.setAdapter(modeladapter);

            } else if (carBrand.equals("Honda")) {
                Spinner model = (Spinner) findViewById(R.id.model);
                String[] models = new String[]{"Civic", "NSX", "Accord"};
                ArrayAdapter<String> modeladapter = new ArrayAdapter<>(YourActivity.this, android.R.layout.simple_spinner_dropdown_item, models);
                model.setAdapter(modeladapter);
            } else if (carBrand.equals("Toyota")) {
                Spinner model = (Spinner) findViewById(R.id.model);
                String[] models = new String[]{"Supra", "AE86", "GT86"};
                ArrayAdapter<String> modeladapter = new ArrayAdapter<>(YourActivity.this, android.R.layout.simple_spinner_dropdown_item, models);
                model.setAdapter(modeladapter);
            }
        }

@覆盖
已选择公共视图（AdapterView父视图、视图视图、整型位置、长id）{
字符串carBrand=parent.getSelect