Question

我试图通过从微调器中选择一个国家来填充城市。它应该根据第一个微调器的选择填充第二个微调器的内容。我的strings.xml和MainActivity.java文件是这样的：

的strings.xml

 <!-- Countries -->
<string-array name="country_names">
    <item>Turkey</item>
    <item>Spain</item>
</string-array>

<!-- Cities -->
<string-array name="Turkey">
    <item>Istanbul</item>
    <item>Adana</item>
</string-array>

<string-array name="Spain">
    <item>Madrid</item>
    <item>Barcelona</item>
</string-array>

MainActivity.java

    citySpinner = (Spinner) findViewById(R.id.input_city);
    countrySpinner = (Spinner) findViewById(R.id.input_country);

    countryAdapter = ArrayAdapter.createFromResource(this,R.array.country_names,android.R.layout.simple_spinner_item);
    countryAdapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);

    final String[] country = new String[1];
    countrySpinner.setAdapter(countryAdapter);
    countrySpinner.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
        @Override
        public void onItemSelected(AdapterView<?> adapterView, View view, int i, long l)
        {
            country[0] = adapterView.getItemAtPosition(i).toString();
            Toast.makeText(mContext, adapterView.getItemAtPosition(i) + " selected", Toast.LENGTH_SHORT).show();
        }

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

        }
    });

    cityAdapter = ArrayAdapter.createFromResource(this,R.array.Turkey,android.R.layout.simple_spinner_item);
    cityAdapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
    citySpinner.setAdapter(cityAdapter);

我需要在cityAdapter = ArrayAdapter.createFromResource(...)行内提供一个变量，而不是写土耳其语或任何国家/地区名称。

我无法在网上找到任何有用的内容，这是我最后的希望：）

Answer 1

在第一个微调器的setonitemselected中，声明第二个微调器并调用clicklistener函数，即second_spinner.setonitemselectedlistener，然后两个回调方法将在第一个微调器的setonitemselected方法中实现。

Answer 2

试试这个：

countrySpinner.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
            @Override
            public void onItemSelected(AdapterView<?> adapterView, View view, int i, long l) {
                country[0] = adapterView.getItemAtPosition(i).toString();
                Toast.makeText(mContext, adapterView.getItemAtPosition(i) + " selected", Toast.LENGTH_SHORT).show();
                switch (i) {
                    case 0:
                        cityAdapter = ArrayAdapter.createFromResource(this, R.array.Turkey, android.R.layout.simple_spinner_item);
                        break;
                    case 1:
                        cityAdapter = ArrayAdapter.createFromResource(this, R.array.Madrid, android.R.layout.simple_spinner_item);
                        break;
                }
                cityAdapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
                citySpinner.setAdapter(cityAdapter);
            }

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

        }
    });

Android从另一个Spinner填充Spinner内容

2 个答案: