android - 如何使编辑文本前缀不可编辑

Question

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Answer 1

用你的类自定义 EditText。

找到下面的示例代码以供引用。

public class CustomEdit extends EditText {

    private String mPrefix = "+"; // can be hardcoded for demo purposes
    private Rect mPrefixRect = new Rect(); // actual prefix size

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

    @Override
    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
        getPaint().getTextBounds(mPrefix, 0, mPrefix.length(), mPrefixRect);
        mPrefixRect.right += getPaint().measureText(" "); // add some offset
        super.onMeasure(widthMeasureSpec, heightMeasureSpec);
    }

    @Override
    protected void onDraw(Canvas canvas) {
        super.onDraw(canvas);
        canvas.drawText(mPrefix, super.getCompoundPaddingLeft(), getBaseline(), getPaint());
    }

    @Override
    public int getCompoundPaddingLeft() {
        return super.getCompoundPaddingLeft() + mPrefixRect.width();
    }
}

在xml中使用如下

<com.example.CustomEdit
            android:id="@+id/edt_no"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:textColor="@color/edit_gray"
            android:textSize="@dimen/text_14sp"
            android:inputType="number"
            android:maxLength="10"
            >