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Android學習筆記之詳細講解畫圓角圖片
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package xiaosi.RoundConcer;
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import android.app.Activity;
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import android.graphics.Bitmap;
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import android.graphics.Bitmap.Config;
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import android.graphics.BitmapFactory;
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import android.graphics.Canvas;
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import android.graphics.Paint;
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import android.graphics.PorterDuff.Mode;
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import android.graphics.PorterDuffXfermode;
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import android.graphics.Rect;
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import android.graphics.RectF;
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import android.os.Bundle;
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import android.widget.ImageView;
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public class RoundConcerActivity extends Activity
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{
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/**
Called when the activity is first created. */
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private ImageView
roundImage = null;
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@Override
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public void onCreate(Bundle
savedInstanceState)
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{
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super.onCreate(savedInstanceState);
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setContentView(R.layout.main);
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roundImage
= (ImageView)findViewById(R.id.roundconcer);
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Bitmap
bitmap = BitmapFactory.decodeResource(getResources(), R.drawable.a);
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roundImage.setImageBitmap(getRoundCornerImage(bitmap, 50));
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}
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public static Bitmap
getRoundCornerImage(Bitmap bitmap, int roundPixels)
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{
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//創建一個和原始圖片一樣大小位圖
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Bitmap
roundConcerImage = Bitmap.createBitmap(bitmap.getWidth(),
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bitmap.getHeight(),
Config.ARGB_8888);
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//創建帶有位圖roundConcerImage的畫布
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Canvas
canvas = new Canvas(roundConcerImage);
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//創建畫筆
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Paint
paint = new Paint();
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//創建一個和原始圖片一樣大小的矩形
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Rect
rect = new Rect(0, 0,
bitmap.getWidth(), bitmap.getHeight());
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RectF
rectF = new RectF(rect);
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//
去鋸齒
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paint.setAntiAlias(true);
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//畫一個和原始圖片一樣大小的圓角矩形
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canvas.drawRoundRect(rectF,
roundPixels, roundPixels, paint);
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//設置相交模式
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paint.setXfermode(new PorterDuffXfermode(Mode.SRC_IN));
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//把圖片畫到矩形去
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canvas.drawBitmap(bitmap, null,
rect, paint);
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return roundConcerImage;
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}
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}
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最後更新：2017-04-02 16:47:59