Android中绘制圆角矩形图片及任意形状图片
Android中绘制圆角矩形图片及任意形状图片
圆角矩形图片在苹果的产品中很流行,相比于普通的矩形,很多人都喜欢圆角矩形的图片,因为它避开了直角的生硬,带来更好的用户体验,下面是几个设计的例子:
下面在Android中实现将普通的矩形图片绘制成圆角矩形。首先看最终效果:
代码清单:
- package com.example.phototest;
- import android.os.Bundle;
- import android.app.Activity;
- import android.graphics.Bitmap;
- import android.graphics.BitmapFactory;
- import android.graphics.Canvas;
- import android.graphics.Color;
- import android.graphics.Paint;
- import android.graphics.Path;
- import android.graphics.PorterDuffXfermode;
- import android.graphics.PorterDuff;
- import android.graphics.RectF;
- import android.graphics.drawable.BitmapDrawable;
- import android.graphics.drawable.Drawable;
- import android.view.Menu;
- import android.widget.ImageView;
- public class MainActivity extends Activity {
- private ImageView myImageView;
- @Override
- public void onCreate(Bundle savedInstanceState) {
- super.onCreate(savedInstanceState);
- setContentView(R.layout.activity_main);
- myImageView=(ImageView)findViewById(R.id.imageView1);
- Bitmap photo = BitmapFactory.decodeResource(getResources(), R.drawable.photo1);
- myImageView.setImageBitmap(createFramedPhoto(500,400,photo,20));
- //myImageView.setImageBitmap(createStarPhoto(500,400,photo));
- }
- @Override
- public boolean onCreateOptionsMenu(Menu menu) {
- getMenuInflater().inflate(R.menu.activity_main, menu);
- return true;
- }
- private Bitmap createFramedPhoto(int x, int y, Bitmap image, float outerRadiusRat) {
- //根据源文件新建一个darwable对象
- Drawable imageDrawable = new BitmapDrawable(image);
- // 新建一个新的输出图片
- Bitmap output = Bitmap.createBitmap(x, y, Bitmap.Config.ARGB_8888);
- Canvas canvas = new Canvas(output);
- // 新建一个矩形
- RectF outerRect = new RectF(0, 0, x, y);
- // 产生一个红色的圆角矩形
- Paint paint = new Paint(Paint.ANTI_ALIAS_FLAG);
- paint.setColor(Color.RED);
- canvas.drawRoundRect(outerRect, outerRadiusRat, outerRadiusRat, paint);
- // 将源图片绘制到这个圆角矩形上
- //详解见http://lipeng88213.iteye.com/blog/1189452
- paint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.SRC_IN));
- imageDrawable.setBounds(0, 0, x, y);
- canvas.saveLayer(outerRect, paint, Canvas.ALL_SAVE_FLAG);
- imageDrawable.draw(canvas);
- canvas.restore();
- return output;
- }
- }
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