立即在Android上显示自动完成功能 [英] Immediately show autocomplete on Android

问题描述

Android自动完成功能仅在两个字母之后开始.如何做到这一点，以便仅在选择该字段时出现列表?

The Android autocomplete only starts after two letters. How can I make it so the list appears when the field is just selected?

推荐答案

扩展了AutoCompleteTextView，覆盖了fullyToFilter()方法和threshold方法，以便它不会将0阈值替换为1阈值:

Extend the AutoCompleteTextView, overriding the enoughToFilter() methods and the threshold methods so that it doesn't replace the 0 threshold with a 1 threshold:

public class MyAutoCompleteTextView extends AutoCompleteTextView {

    private int myThreshold;

    public MyAutoCompleteTextView(Context context) {
        super(context);
    }

    public MyAutoCompleteTextView(Context context, AttributeSet attrs, int defStyle) {
        super(context, attrs, defStyle);
    }

    public MyAutoCompleteTextView(Context context, AttributeSet attrs) {
        super(context, attrs);
    }

    @Override
    public void setThreshold(int threshold) {
        if (threshold < 0) {
            threshold = 0;
        }
        myThreshold = threshold;
    }

    @Override
    public boolean enoughToFilter() {
        return getText().length() >= myThreshold;
    }

    @Override
    public int getThreshold() {
        return myThreshold;
    }

}

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