android - 带有不可编辑/不可取消后缀的 EditText

Question

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Answer 1

这是我的解决方案:一个在文本后面绘制后缀的 EditText 类。有两个自定义属性用于定义后缀的文本和后缀填充(到 EditText 的左上角)。

public class EditTextWithSuffix extends EditText {
    TextPaint textPaint = new TextPaint();
    private String suffix = "";
    private float suffixPadding;

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

    public EditTextWithSuffix(Context context, AttributeSet attrs) {
        super(context, attrs);
        getAttributes(context, attrs, 0);
    }

    public EditTextWithSuffix(Context context, AttributeSet attrs, int defStyleAttr) {
        super(context, attrs, defStyleAttr);
        getAttributes(context, attrs, defStyleAttr);
    }

    @Override
    public void onDraw(Canvas c){
        super.onDraw(c);
        int suffixXPosition = (int) textPaint.measureText(getText().toString()) + getPaddingLeft();
        c.drawText(suffix, Math.max(suffixXPosition, suffixPadding), getBaseline(), textPaint);
    }

    @Override
    protected void onFinishInflate() {
        super.onFinishInflate();
        textPaint.setColor(getCurrentTextColor());
        textPaint.setTextSize(getTextSize());
        textPaint.setTextAlign(Paint.Align.LEFT);
    }

    private void getAttributes(Context context, AttributeSet attrs, int defStyleAttr) {
        TypedArray a = context.obtainStyledAttributes(attrs, R.styleable.EditTextWithSuffix, defStyleAttr, 0);
        if(a != null) {
            suffix = a.getString(R.styleable.EditTextWithSuffix_suffix);
            if(suffix == null) {
                suffix = "";
            }
            suffixPadding = a.getDimension(R.styleable.EditTextWithSuffix_suffixPadding, 0);
        }
        a.recycle();
    }
}

这是属性定义:

<resources>
    <declare-styleable name="EditTextWithSuffix">
        <attr name="suffix" format="string|reference" />
        <attr name="suffixPadding" format="dimension" />
    </declare-styleable>
</resources>