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  • Android自己定义视图(一):带下划线的TextView

    package com.francis.underlinetextviewtest;
    
    import android.content.Context;
    import android.content.res.Resources;
    import android.graphics.Canvas;
    import android.graphics.Color;
    import android.graphics.Paint;
    import android.util.AttributeSet;
    import android.util.Log;
    import android.util.TypedValue;
    import android.widget.TextView;
    
    /**
     * Created by Francis on 14-10-13.
     */
    public class UnderlineTextView extends TextView {
    
        private final Paint mPaint = new Paint();
        private int mUnderlineHeight = 0;
    
        public UnderlineTextView(Context context) {
            this(context, null);
        }
    
        public UnderlineTextView(Context context, AttributeSet attrs) {
            this(context, attrs, 0);
        }
    
        public UnderlineTextView(Context context, AttributeSet attrs, int defStyle) {
            super(context, attrs, defStyle);
            init(context, attrs);
        }
    
        private void init(Context context, AttributeSet attrs) {
            Resources r = getResources();
            // mUnderlineHeight == 6
            mUnderlineHeight = (int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, 2, r.getDisplayMetrics());
        }
    
        @Override
        public void setPadding(int left, int top, int right, int bottom) {
            super.setPadding(left, top, right, bottom + mUnderlineHeight);
        }
    
        @Override
        protected void onDraw(Canvas canvas) {
            super.onDraw(canvas);
            // Draw the underline the same color as the text
    
            mPaint.setColor(getTextColors().getDefaultColor());
            // 对角线上的两点。

    canvas.drawRect(0, getHeight() - mUnderlineHeight, getWidth(), getHeight(), mPaint); } }

    加入布局文件:

    <com.francis.underlinetextviewtest.UnderlineTextView
            android:text="@string/hello_world"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:textStyle="bold"
            android:textColor="#FFDDDDDD"/>


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  • 原文地址:https://www.cnblogs.com/liguangsunls/p/7102958.html
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