如何在微調器 android 工作室中更改項目

Question

當第一個微調器的值發生更改時，我想更改第二個微調器的值我嘗試了解決方案，但沒有得到確切的解決方案，所以任何人都有解決方案，所以請提出建議或有任何問題，然后請詢問

ArrayAdapter<String> deptArrayAdapter = new ArrayAdapter<String>(this, android.R.layout.simple_spinner_item, getResources().getStringArray(R.array.Province));
        deptArrayAdapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
        spinnerProvinceEyeTest.setAdapter(deptArrayAdapter);
        deptArrayAdapter.notifyDataSetChanged();

Answer 1

1. 首先設置一個OnItemSelectedListener() 。

    spinnerProvinceEyeTest.setOnItemSelectedListener(new OnItemSelectedListener() { public void onItemSelected(AdapterView<?> parent, View view, int position, long id) { String selectedItem = parent.getItemAtPosition(position).toString(); //this is your selected item } public void onNothingSelected(AdapterView<?> parent) { } });

2. 在上述偵聽器的onItemSelected()中，放置您的條件並將第二個Spinner的資源設置為：

    If(selectedItem == "YourText"){ //Here, you're initalizing the second `Spinner` ArrayAdapter<String> secondArrayAdapter = new ArrayAdapter<String>(this, android.R.layout.simple_spinner_item, getResources().getStringArray(R.array.YourList)); secondArrayAdapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item); secondSpinner.setAdapter(secondArrayAdapter); } else{ //Use any other list with arrayAdapter in case of other item selected. //Use can use If-else-if or Switch to select different resource for different item of first spinner }

參考 - 官方文檔。