【Android隨記】-- Android自定義控件效果實現

 效果圖：

---

看代碼，不難：

package com.example.test;

import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.util.AttributeSet;
import android.util.Log;
import android.widget.RelativeLayout;

public class MyLayout extends RelativeLayout {

    String title;

    public MyLayout(Context context, AttributeSet attrs, int defStyle) {
        super(context, attrs, defStyle);
        // TODO Auto-generated constructor stub
    }

    public MyLayout(Context context, AttributeSet attrs) {
        super(context, attrs);
        // TODO Auto-generated constructor stub
    }

    public MyLayout(Context context, String title) {
        super(context);
        // TODO Auto-generated constructor stub
        this.title = title;
    }

    @Override
    protected void dispatchDraw(Canvas canvas) {

        Paint paint = new Paint();
        paint.setColor(Color.BLACK);
        int width = getWidth();
        int height = getHeight();
        int empty = 25;

        Paint paint2 = new Paint();

        paint2.setColor(Color.BLACK);
        paint2.setTextSize(25);
        paint2.setAntiAlias(true);
        canvas.drawColor(Color.WHITE);
        float length=paint2.measureText(title);
        Log.e("length", length+"");

        canvas.drawText(title, empty*2, empty+10, paint2);

        canvas.drawLine(empty, empty, empty*2, empty, paint);
        canvas.drawLine(empty*2+length, empty,  width - empty, empty, paint);
//      canvas.drawLine(empty, empty, width - empty, empty, paint);

        canvas.drawLine(width - empty, empty, width - empty, height - empty,
                paint);

        canvas.drawLine(width - empty, height - empty, empty, height - empty,
                paint);

        canvas.drawLine(empty, empty, empty, height - empty, paint);
        setPadding(empty+10, empty+10, empty+10, empty+10);
        super.dispatchDraw(canvas);


    }
}

調用方法：

MyLayout layout = new MyLayout(this,"測試一下");
        TextView textView=new TextView(this);