Android自訂View基礎

這個就一個簡單的自訂View控間，  在xml中註冊即可顯示  看個把。

import android.content.Context;import android.graphics.Bitmap;import android.graphics.BitmapFactory;import android.graphics.Canvas;import android.graphics.Color;import android.graphics.Paint;import android.graphics.Paint.Align;import android.graphics.Paint.Style;import android.util.AttributeSet;import android.view.View;public class DiyView extends View{public DiyView(Context context){super(context);// TODO Auto-generated constructor stub}public DiyView(Context context, AttributeSet attrs){super(context, attrs);}@Overrideprotected void onDraw(Canvas canvas){super.onDraw(canvas);//定義畫筆Paint paint=new Paint(); //設定其屬性paint.setStrokeJoin(Paint.Join.ROUND);paint.setStrokeCap(Paint.Cap.ROUND);paint.setColor(Color.RED);//畫線canvas.drawLine(0, 0, 300, 0, paint);paint.setColor(Color.GREEN);paint.setStyle(Style.STROKE);//畫圓canvas.drawCircle(20, 80, 20, paint);paint.setStyle(Style.FILL);paint.setColor(Color.BLUE);//矩形canvas.drawRect(0, 200, 50, 300, paint);paint.setColor(Color.GRAY);paint.setTextSize(20);paint.setTextAlign(Align.CENTER);//文字canvas.drawText("test", 150, 150, paint);//圖片Bitmap bitmap=BitmapFactory.decodeResource(getResources(), R.drawable.ic_launcher);canvas.drawBitmap(bitmap, 300, 300, paint);paint.setColor(Color.BLACK);paint.setStrokeWidth(40);//畫點 ，這裡看起來像個圓， 主要是設定setStrokeWidth所以才比較大int colorfuls[]=new int[]{Color.BLUE,Color.GREEN,Color.RED,Color.MAGENTA,Color.BLACK};for(int i =0;i<200;i+=40){paint.setColor( colorfuls[i/40]);canvas.drawPoint(200, 200+i, paint);}canvas.save();}}