溫馨提示×

溫馨提示×

您好，登錄后才能下訂單哦！

密碼登錄×
登錄注冊×
其他方式登錄
點擊 登錄注冊 即表示同意《億速云用戶服務條款》

Android 圖片Bitmap的剪切的示例代碼

發(fā)布時間：2020-10-25 05:03:46 來源：腳本之家 閱讀：157 作者：停止的豬頭 欄目：移動開發(fā)

一、什么是Android中的Bitmap

Bitmap是Android系統(tǒng)中的圖像處理的最重要類之一。用它可以獲取圖像文件信息，進行圖像剪切、旋轉(zhuǎn)、縮放等操作，并可以指定格式保存圖像文件。

二、Bitmap的剪切基本操作

復制代碼 代碼如下:

public static Bitmap createBitmap (Bitmap source, int x, int y, int width, int height, Matrix m, boolean filter)

從原始位圖剪切圖像，這是一種高級的方式?？梢杂肕atrix(矩陣)來實現(xiàn)旋轉(zhuǎn)等高級方式截圖

參數(shù)說明：

Bitmap source：要從中截圖的原始位圖

int x:起始x坐標

int y：起始y坐標

int width：要截的圖的寬度

int height：要截的圖的寬度

Bitmap.Config  config：一個枚舉類型的配置，可以定義截到的新位圖的質(zhì)量

返回值：返回一個剪切好的Bitmap

三、Bitmap剪切的封裝

實際使用中，因為項目需要時常需要對基本功能進行封裝，下面是一段封裝的代碼，僅供參考。

import java.io.ByteArrayOutputStream; 
import java.io.File; 
import java.io.FileInputStream; 
import java.io.FileNotFoundException; 
import java.io.IOException; 
import java.io.InputStream; 
import java.util.ArrayList; 
import android.content.Context; 
import android.graphics.Bitmap; 
import android.graphics.Bitmap.Config; 
import android.graphics.BitmapFactory; 
import android.graphics.Canvas; 
import android.graphics.Paint; 
import android.graphics.PorterDuff; 
import android.graphics.PorterDuff.Mode; 
import android.graphics.PorterDuffXfermode; 
import android.graphics.Rect; 
import android.graphics.RectF; 
 
public class BitmapCut 
{ 
 
 /** 
 * 通過資源id轉(zhuǎn)化成Bitmap 
 * 
 * @param context 
 * @param resId 
 * @return 
 */ 
 public static Bitmap ReadBitmapById(Context context, int resId) 
 { 
 BitmapFactory.Options opt = new BitmapFactory.Options(); 
 opt.inPreferredConfig = Bitmap.Config.RGB_565; 
 opt.inPurgeable = true; 
 opt.inInputShareable = true; 
 
 InputStream is = context.getResources().openRawResource(resId); 
 return BitmapFactory.decodeStream(is, null, opt); 
 } 
 
 /** 
 * 設置背景為圓角 
 * 
 * @param bitmap 
 * @param pixels 
 * @return 
 */ 
 public static Bitmap removeYuanjiao(Bitmap bitmap, int pixels) 
 { 
 int width = bitmap.getWidth(); 
 int height = bitmap.getHeight(); 
 
 Bitmap creBitmap = Bitmap.createBitmap(width, height, 
  android.graphics.Bitmap.Config.ARGB_8888); 
 Canvas canvas = new Canvas(creBitmap); 
 
 Paint paint = new Paint(); 
 float roundPx = pixels; 
 RectF rectF = new RectF(0, 0, bitmap.getWidth() - pixels, 
  bitmap.getHeight() - pixels); 
 paint.setAntiAlias(true); 
 
 canvas.drawARGB(0, 0, 0, 0); 
 canvas.drawRoundRect(rectF, roundPx, roundPx, paint); 
 paint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.SRC_IN)); 
 
 canvas.drawBitmap(bitmap, 0, 0, paint); 
 if (!bitmap.isRecycled()) 
  bitmap.recycle(); 
 
 return creBitmap; 
 } 
 
 /** 
 * 按正方形裁切圖片 
 */ 
 public static Bitmap ImageCrop(Bitmap bitmap, boolean isRecycled) 
 { 
 
 if (bitmap == null) 
 { 
  return null; 
 } 
 
 int w = bitmap.getWidth(); // 得到圖片的寬，高 
 int h = bitmap.getHeight(); 
 
 int wh = w > h ? h : w;// 裁切后所取的正方形區(qū)域邊長 
 
 int retX = w > h ? (w - h) / 2 : 0;// 基于原圖，取正方形左上角x坐標 
 int retY = w > h ? 0 : (h - w) / 2; 
 
 Bitmap bmp = Bitmap.createBitmap(bitmap, retX, retY, wh, wh, null, 
  false); 
 if (isRecycled && bitmap != null && !bitmap.equals(bmp) 
  && !bitmap.isRecycled()) 
 { 
  bitmap.recycle(); 
  bitmap = null; 
 } 
 
 // 下面這句是關(guān)鍵 
 return bmp;// Bitmap.createBitmap(bitmap, retX, retY, wh, wh, null, 
   // false); 
 } 
 
 /** 
 * 按長方形裁切圖片 
 * 
 * @param bitmap 
 * @return 
 */ 
 public static Bitmap ImageCropWithRect(Bitmap bitmap) 
 { 
 if (bitmap == null) 
 { 
  return null; 
 } 
 
 int w = bitmap.getWidth(); // 得到圖片的寬，高 
 int h = bitmap.getHeight(); 
 
 int nw, nh, retX, retY; 
 if (w > h) 
 { 
  nw = h / 2; 
  nh = h; 
  retX = (w - nw) / 2; 
  retY = 0; 
 } else 
 { 
  nw = w / 2; 
  nh = w; 
  retX = w / 4; 
  retY = (h - w) / 2; 
 } 
 
 // 下面這句是關(guān)鍵 
 Bitmap bmp = Bitmap.createBitmap(bitmap, retX, retY, nw, nh, null, 
  false); 
 if (bitmap != null && !bitmap.equals(bmp) && !bitmap.isRecycled()) 
 { 
  bitmap.recycle(); 
  bitmap = null; 
 } 
 return bmp;// Bitmap.createBitmap(bitmap, retX, retY, nw, nh, null, 
   // false); 
 } 
 
 /** 
 * Bitmap --> byte[] 
 * 
 * @param bmp 
 * @return 
 */ 
 public static byte[] readBitmap(Bitmap bmp) 
 { 
 ByteArrayOutputStream baos = new ByteArrayOutputStream(); 
 bmp.compress(Bitmap.CompressFormat.JPEG, 60, baos); 
 try 
 { 
  baos.flush(); 
  baos.close(); 
 } catch (IOException e) 
 { 
  e.printStackTrace(); 
 } 
 return baos.toByteArray(); 
 } 
 
 
 /** 
 * 將圖像裁剪成圓形 
 * 
 * @param bitmap 
 * @return 
 */ 
 public static Bitmap toRoundBitmap(Bitmap bitmap) 
 { 
 if (bitmap == null) 
 { 
  return null; 
 } 
 
 int width = bitmap.getWidth(); 
 int height = bitmap.getHeight(); 
 float roundPx; 
 float left, top, right, bottom, dst_left, dst_top, dst_right, dst_bottom; 
 if (width <= height) 
 { 
  roundPx = width / 2; 
  top = 0; 
  bottom = width; 
  left = 0; 
  right = width; 
  height = width; 
  dst_left = 0; 
  dst_top = 0; 
  dst_right = width; 
  dst_bottom = width; 
 } else 
 { 
  roundPx = height / 2; 
  float clip = (width - height) / 2; 
  left = clip; 
  right = width - clip; 
  top = 0; 
  bottom = height; 
  width = height; 
  dst_left = 0; 
  dst_top = 0; 
  dst_right = height; 
  dst_bottom = height; 
 } 
 
 Bitmap output = Bitmap.createBitmap(width, height, Config.ARGB_8888); 
 Canvas canvas = new Canvas(output); 
 
 final int color = 0xff424242; 
 final Paint paint = new Paint(); 
 final Rect src = new Rect((int) left, (int) top, (int) right, 
  (int) bottom); 
 final Rect dst = new Rect((int) dst_left, (int) dst_top, 
  (int) dst_right, (int) dst_bottom); 
 final RectF rectF = new RectF(dst); 
 
 paint.setAntiAlias(true); 
 
 canvas.drawARGB(0, 0, 0, 0); 
 paint.setColor(color); 
 canvas.drawRoundRect(rectF, roundPx, roundPx, paint); 
 
 paint.setXfermode(new PorterDuffXfermode(Mode.SRC_IN)); 
 canvas.drawBitmap(bitmap, src, dst, paint); 
 if (bitmap != null && !bitmap.isRecycled()) 
 { 
  bitmap.recycle(); 
  bitmap = null; 
 } 
 return output; 
 } 
 
 // 將圖片變成帶圓邊的圓形圖片 
 public static Bitmap getRoundBitmap(Bitmap bitmap, int width, int height) 
 { 
 if (bitmap == null) 
 { 
  return null; 
 } 
 // 將圖片變成圓角 
 Bitmap roundBitmap = Bitmap.createBitmap(width, height, 
  Config.ARGB_8888); 
 Canvas canvas = new Canvas(roundBitmap); 
 Paint paint = new Paint(Paint.ANTI_ALIAS_FLAG); 
 int len = (width > height) ? height : width; 
 canvas.drawCircle(width / 2, height / 2, len / 2 - 8, paint); 
 paint.setXfermode(new PorterDuffXfermode(Mode.SRC_IN)); 
 Bitmap scaledBitmap = Bitmap.createScaledBitmap(bitmap, len, len, true); 
 canvas.drawBitmap(scaledBitmap, 0, 0, paint); 
 // 將圖片加圓邊 
 Bitmap outBitmap = Bitmap.createBitmap(width, height, Config.ARGB_8888); 
 canvas = new Canvas(outBitmap); 
 paint = new Paint(Paint.ANTI_ALIAS_FLAG); 
 paint.setColor(0xffffffff); 
 canvas.drawCircle(width / 2, height / 2, len / 2 - 4, paint); 
 paint.setXfermode(new PorterDuffXfermode(Mode.SRC_OVER)); 
 canvas.drawBitmap(roundBitmap, 0, 0, paint); 
 bitmap.recycle(); 
 bitmap = null; 
 roundBitmap.recycle(); 
 roundBitmap = null; 
 scaledBitmap.recycle(); 
 scaledBitmap = null; 
 return outBitmap; 
 } 
 
 // 將圖片變成帶圓邊的圓形圖片 
 public static Bitmap getRoundBitmap(Bitmap bitmap, int width, int height, 
  int color) 
 { 
 if (bitmap == null) 
 { 
  return null; 
 } 
 // 將圖片變成圓角 
 Bitmap roundBitmap = Bitmap.createBitmap(width, height, 
  Config.ARGB_8888); 
 Canvas canvas = new Canvas(roundBitmap); 
 Paint paint = new Paint(Paint.ANTI_ALIAS_FLAG); 
 int len = (width > height) ? height : width; 
 canvas.drawCircle(width / 2, height / 2, len / 2 - 8, paint); 
 paint.setXfermode(new PorterDuffXfermode(Mode.SRC_IN)); 
 Bitmap scaledBitmap = Bitmap.createScaledBitmap(bitmap, len, len, true); 
 canvas.drawBitmap(scaledBitmap, 0, 0, paint); 
 // 將圖片加圓邊 
 Bitmap outBitmap = Bitmap.createBitmap(width, height, Config.ARGB_8888); 
 canvas = new Canvas(outBitmap); 
 paint = new Paint(Paint.ANTI_ALIAS_FLAG); 
 paint.setColor(color); 
 canvas.drawCircle(width / 2, height / 2, len / 2 - 4, paint); 
 paint.setXfermode(new PorterDuffXfermode(Mode.SRC_OVER)); 
 canvas.drawBitmap(roundBitmap, 0, 0, paint); 
 bitmap.recycle(); 
 bitmap = null; 
 roundBitmap.recycle(); 
 roundBitmap = null; 
 scaledBitmap.recycle(); 
 scaledBitmap = null; 
 return outBitmap; 
 } 
 
 /** 
 * function:圖片轉(zhuǎn)圓角 
 * 
 * @param bitmap 
 *  需要轉(zhuǎn)的bitmap 
 * @param pixels 
 *  轉(zhuǎn)圓角的弧度 
 * @return 轉(zhuǎn)圓角的bitmap 
 */ 
 public static Bitmap toRoundCorner(Bitmap bitmap, int pixels) 
 { 
 Bitmap output = Bitmap.createBitmap(bitmap.getWidth(), 
  bitmap.getHeight(), Config.ARGB_8888); 
 Canvas canvas = new Canvas(output); 
 final int color = 0xff424242; 
 final Paint paint = new Paint(); 
 final Rect rect = new Rect(0, 0, bitmap.getWidth(), bitmap.getHeight()); 
 final RectF rectF = new RectF(rect); 
 final float roundPx = pixels; 
 paint.setAntiAlias(true); 
 canvas.drawARGB(0, 0, 0, 0); 
 paint.setColor(color); 
 canvas.drawRoundRect(rectF, roundPx, roundPx, paint); 
 paint.setXfermode(new PorterDuffXfermode(Mode.SRC_IN)); 
 canvas.drawBitmap(bitmap, rect, rect, paint); 
 if (bitmap != null && !bitmap.isRecycled()) 
 { 
  bitmap.recycle(); 
 } 
 return output; 
 } 
 
 /** 
 * 獲取指定的圓角圖片 
 * 
 * @param bitmap 
 * @return 
 */ 
 public static Bitmap getRadiusBitmap(Bitmap bitmap) 
 { 
 Paint paint = new Paint(Paint.ANTI_ALIAS_FLAG); 
 paint.setColor(0xffffffff); 
 Bitmap radiusBitmap = Bitmap.createBitmap(bitmap.getWidth(), 
  bitmap.getHeight(), Config.ARGB_8888); 
 Canvas canvas = new Canvas(radiusBitmap); 
 RectF rectF = new RectF(0, 0, bitmap.getWidth(), bitmap.getHeight()); 
 canvas.drawRoundRect(rectF, 7, 7, paint); 
 paint.setXfermode(new PorterDuffXfermode(Mode.SRC_IN)); 
 canvas.drawBitmap(bitmap, 0, 0, paint); 
 if (bitmap != null && !bitmap.isRecycled()) 
 { 
  bitmap.recycle(); 
 } 
 return radiusBitmap; 
 } 
 
 // 獲得指定大小的圓邊的bitmap數(shù)組 
 public static ArrayList<Bitmap> getRadiusBitmapList(String[] pathArray, 
  int size, int len, float radius, int color) 
 { 
 Bitmap canvasBitmap = null; 
 Canvas canvas = null; 
 Paint paint = null; 
 RectF rectF = new RectF(0, 0, len - radius, len - radius); 
 File file = null; 
 FileInputStream fis = null; 
 Bitmap bitmap = null; 
 Bitmap scaledBitmap = null; 
 
 ArrayList<Bitmap> list = new ArrayList<Bitmap>(); 
 for (int i = 0; i < pathArray.length; i++) 
 { 
  file = new File(pathArray[i]); 
  if (!file.exists()) 
  continue; 
  try 
  { 
  fis = new FileInputStream(file); 
  bitmap = BitmapFactory.decodeStream(fis); 
  if (bitmap != null) 
  { 
   canvasBitmap = Bitmap.createBitmap(len, len, 
    Config.ARGB_8888); 
   canvas = new Canvas(canvasBitmap); 
   paint = new Paint(Paint.ANTI_ALIAS_FLAG); 
   paint.setColor(color); 
   canvas.drawRoundRect(rectF, radius, radius, paint); 
   paint.setXfermode(new PorterDuffXfermode(Mode.SRC_IN)); 
 
   scaledBitmap = Bitmap.createScaledBitmap(bitmap, len, len, 
    true); 
   canvas.drawBitmap(scaledBitmap, 0, 0, paint); 
   list.add(canvasBitmap); 
  } 
  } catch (FileNotFoundException e) 
  { 
  } finally 
  { 
  if (fis != null) 
  { 
   try 
   { 
   fis.close(); 
   } catch (IOException e1) 
   { 
   } 
  } 
  } 
  if (list.size() == size) 
  break; 
 } 
 if (scaledBitmap != null && !scaledBitmap.isRecycled()) 
 { 
  scaledBitmap.recycle(); 
  scaledBitmap = null; 
 } 
 if (bitmap != null && !bitmap.isRecycled()) 
 { 
  bitmap.recycle(); 
  bitmap = null; 
 } 
 return list; 
 } 
 
 /** 
 * 按照一定的寬高比例裁剪圖片 
 * 
 * @param bitmap 
 * @param num1 
 *  長邊的比例 
 * @param num2 
 *  短邊的比例 
 * @return 
 */ 
 public static Bitmap ImageCrop(Bitmap bitmap, int num1, int num2, 
  boolean isRecycled) 
 { 
 if (bitmap == null) 
 { 
  return null; 
 } 
 int w = bitmap.getWidth(); // 得到圖片的寬，高 
 int h = bitmap.getHeight(); 
 int retX, retY; 
 int nw, nh; 
 if (w > h) 
 { 
  if (h > w * num2 / num1) 
  { 
  nw = w; 
  nh = w * num2 / num1; 
  retX = 0; 
  retY = (h - nh) / 2; 
  } else 
  { 
  nw = h * num1 / num2; 
  nh = h; 
  retX = (w - nw) / 2; 
  retY = 0; 
  } 
 } else 
 { 
  if (w > h * num2 / num1) 
  { 
  nh = h; 
  nw = h * num2 / num1; 
  retY = 0; 
  retX = (w - nw) / 2; 
  } else 
  { 
  nh = w * num1 / num2; 
  nw = w; 
  retY = (h - nh) / 2; 
  retX = 0; 
  } 
 } 
 Bitmap bmp = Bitmap.createBitmap(bitmap, retX, retY, nw, nh, null, 
  false); 
 if (isRecycled && bitmap != null && !bitmap.equals(bmp) 
  && !bitmap.isRecycled()) 
 { 
  bitmap.recycle(); 
  bitmap = null; 
 } 
 return bmp;// Bitmap.createBitmap(bitmap, retX, retY, nw, nh, null, 
   // false); 
 } 
}

示例代碼：Bitmaptest_jb51.rar

以上就是本文的全部內(nèi)容，希望對大家的學習有所幫助，也希望大家多多支持億速云。

向AI問一下細節(jié)

免責聲明：本站發(fā)布的內(nèi)容（圖片、視頻和文字）以原創(chuàng)、轉(zhuǎn)載和分享為主，文章觀點不代表本網(wǎng)站立場，如果涉及侵權(quán)請聯(lián)系站長郵箱：is@yisu.com進行舉報，并提供相關(guān)證據(jù)，一經(jīng)查實，將立刻刪除涉嫌侵權(quán)內(nèi)容。

AI
助
手