java - AutoCompleteTextView 不显示结果

Question

我试图让我的 AutoCompleteTextView 显示结果，但无论我寻找什么示例或解决方案，我都无法让它显示结果。我已经在调试中检查过它，适配器中包含所有值，但它不会显示下拉列表

主.xml

<AutoCompleteTextView
    android:id="@+id/spinnerDropDown"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:textColor="@android:color/primary_text_light"/>

主.java

spinnerdropdown = (AutoCompleteTextView) findViewById(R.id.spinnerDropDown);
    setContentView(R.layout.main);
    ArrayAdapter<String> stringArrayAdapter=
        new ArrayAdapter<String>(
                this,
                android.R.layout.simple_dropdown_item_1line,
                locations
        );
    spinnerdropdown.setThreshold(0);
    stringArrayAdapter.notifyDataSetChanged();
    spinnerdropdown.setAdapter(stringArrayAdapter);
    spinnerdropdown.setTextColor(Color.RED);

locations 是一个字符串 ArrayList

Answer 1

setContentView()(设置 Activity 的布局)应该在找到该布局内的任何 View 之前首先调用。试试这个:

setContentView(R.layout.main);
spinnerdropdown = (AutoCompleteTextView) findViewById(R.id.spinnerDropDown);
ArrayAdapter<String> stringArrayAdapter=
    new ArrayAdapter<String>(
            this,
            android.R.layout.simple_dropdown_item_1line,
            locations 
    ); 
spinnerdropdown.setThreshold(1); 
spinnerdropdown.setAdapter(stringArrayAdapter);
spinnerdropdown.setTextColor(Color.RED);