对现有控件进行拓展

╰半橙微兮° 2022-06-12 12:09 169阅读 0赞

写的带有带有背景和边框

package com.example.administrator.youku_animi.MyView;
    
    import android.content.Context;
    import android.graphics.Canvas;
    import android.graphics.Color;
    import android.graphics.LinearGradient;
    import android.graphics.Paint;
    import android.widget.TextView;
    
    /** * Created by Administrator on 2017/7/22 0022. */
    
    public class MyTextView extends TextView { 
        Paint mPaint1 = null;
        Paint mPaint2 = null;
    
        LinearGradient mLinearGradient = null;
        public MyTextView(Context context)
        {
            super(context);
        }
    
        @Override
        protected void onDraw(Canvas canvas)
        {
            mPaint1 = new Paint();
            mPaint1.setColor(getResources().getColor(android.R.color.holo_blue_light));
            mPaint1.setStyle(Paint.Style.FILL);
            mPaint2 = new Paint();
            mPaint2.setColor(Color.YELLOW);
            mPaint2.setStyle(Paint.Style.FILL);
            //Preconcat the current matrix with the specified translation 
            canvas.drawRect(
                    0,
                    0,
                    getMeasuredWidth(),
                    getMeasuredHeight(),
                    mPaint1
            );
            canvas.drawRect(
                    10,
                    10,
                    getMeasuredWidth() - 10,
                    getMeasuredHeight() - 10,
                    mPaint2
            );
            //Saves the current matrix and clip onto a private stack.
            canvas.save();
            //Preconcat the current matrix with the specified translation 
            canvas.translate(10, 0);
            super.onDraw(canvas);
            //This call balances a previous call to save(), and is used to remove all modifications to the matrix/clip state since the last save call.
            canvas.restore();
        }
    }

闪动字体的TextView

package com.example.administrator.youku_animi.MyView;
    
    import android.content.Context;
    import android.graphics.Canvas;
    import android.graphics.Color;
    import android.graphics.LinearGradient;
    import android.graphics.Matrix;
    import android.graphics.Paint;
    import android.graphics.Shader;
    import android.widget.TextView;
    
    /** * Created by Administrator on 2017/7/22 0022. */
    
    public class MyTextView2 extends TextView { 
        int mTranslate ;
        int mViewWidth;
        LinearGradient mLinearGradient = null;
        Paint mPaint;
        Matrix matrix = null, matrix1;
        public MyTextView2(Context context)
        {
            super(context);
        }
    
        @Override
        protected void onSizeChanged(int w, int h, int oldw, int oldh)
        {
            super.onSizeChanged(w, h, oldw, oldh);
            if (mViewWidth == 0)
            {
                mViewWidth = getMeasuredWidth();
                if (mViewWidth > 0)
                {
                    mPaint = getPaint();
                    mLinearGradient = new LinearGradient(
                            0,
                            0,
                            mViewWidth,
                            0,
                            new int[]{
                                    Color.RED,
                                    0xffffffff,
                                    Color.BLUE
                            },
                            null,
                            Shader.TileMode.REPEAT
                    );
                    mPaint.setShader(mLinearGradient);
                    matrix = new Matrix();
    
    
                }
            }
        }
    
        @Override
        protected void onDraw(Canvas canvas)
        {
            super.onDraw(canvas);
            if (matrix != null)
            {
                mTranslate += mViewWidth / 10;
            }
            matrix.setTranslate(mTranslate, 0);
            mLinearGradient.setLocalMatrix(matrix);
            postInvalidateDelayed(100);
        }
    }