android 绘图与自定义控件

1.布局

2、代码

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.graphics.Rect;
import android.graphics.drawable.BitmapDrawable;
import android.util.AttributeSet;
import android.view.View;
import android.widget.Button;
public class MyView extends View{

public MyView(Context context) {
super(context);
}

public MyView(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
}

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

@Override
protected void onDraw(Canvas canvas) {
Paint paint = new Paint();
paint.setColor(Color.RED);
paint.setTextSize(40);
canvas.drawLine(40,40,400,40,paint);
canvas.drawText("流年逝水",40,100,paint);
Rect rect = new Rect(40,200,240,300);
canvas.drawRect(rect,paint);
canvas.drawCircle(140, 450, 100, paint);
Rect src = new Rect(0,0,100,100);
Rect dst = new Rect(300,200,500,400);
Bitmap bitmap = ((BitmapDrawable)getResources().getDrawable(R.drawable.ic_launcher)).getBitmap();
canvas.drawBitmap(bitmap, src, dst, paint);

super.onDraw(canvas);
}
}

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