Android图片处理工具类BitmapUtils

package com.lvstudio.myapp.utils; import android.content.Context; import android.graphics.Bitmap; import android.graphics.BitmapFactory; import android.graphics.Canvas; import android.graphics.Matrix; import android.graphics.PixelFormat; import android.graphics.drawable.BitmapDrawable; import android.graphics.drawable.Drawable; import android.util.DisplayMetrics; import android.view.WindowManager; import java.io.ByteArrayInputStream; import java.io.ByteArrayOutputStream; import java.io.File; import java.io.FileNotFoundException; import java.io.FileOutputStream; import java.io.IOException; import java.io.InputStream; /** * Created by LvStudio on 2016/11/7. */ public class BitmapUtils { /** * 屏幕分辨率和指定清晰度的图片压缩方法 * * @param context * @param image Bitmap图片 * @return */ public static Bitmap comp(Context context, Bitmap image) { int maxLength = 1024 * 1024; // 预定的图片最大内存，单位byte // 压缩大小 ByteArrayOutputStream baos = new ByteArrayOutputStream(); image.compress(Bitmap.CompressFormat.JPEG, 100, baos);// 质量压缩方法，这里100表示不压缩，把压缩后的数据存放到baos中 int options = 100; while (baos.toByteArray().length > maxLength) { // 循环判断，大于继续压缩 options -= 10;// 每次都减少10 baos.reset();// 重置baos即清空baos image.compress(Bitmap.CompressFormat.JPEG, options, baos);//PNG 压缩options% } // 压缩尺寸 ByteArrayInputStream bais = new ByteArrayInputStream(baos.toByteArray()); BitmapFactory.Options opts = new BitmapFactory.Options(); // 选项对象(在加载图片时使用) opts.inJustDecodeBounds = true; // 修改选项, 只获取大小 BitmapFactory.decodeStream(bais, null, opts);// 加载图片(只得到图片大小) // 获取屏幕大小，按比例压缩 WindowManager manager = (WindowManager) context.getSystemService(Context.WINDOW_SERVICE); int scaleX = opts.outWidth / manager.getDefaultDisplay().getWidth(); // X轴缩放比例(图片宽度/屏幕宽度) int scaleY = opts.outHeight / manager.getDefaultDisplay().getHeight(); // Y轴缩放比例 int scale = scaleX > scaleY ? scaleX : scaleY; // 图片的缩放比例(X和Y哪个大选哪个) opts.inJustDecodeBounds = false; // 修改选项, 不只解码边界 opts.inSampleSize = scale > 1 ? scale : 1; // 修改选项, 加载图片时的缩放比例 return BitmapFactory.decodeStream(bais, null, opts); // 加载图片(得到压缩后的图片) } /** * 屏幕分辨率和指定清晰度的图片压缩方法 * * @param context * @param path 图片的路径 * @return */ public static Bitmap comp(Context context, String path) { return compressImage(getUsableImage(context, path)); } /** * 获取屏幕分辨率的Bitmap * * @param context * @param path 图片的路径 * @return */ public static Bitmap getUsableImage(Context context, String path) { BitmapFactory.Options opts = new BitmapFactory.Options(); // 选项对象(在加载图片时使用) opts.inJustDecodeBounds = true; // 修改选项, 只获取大小 BitmapFactory.decodeFile(path, opts); // 加载图片(只得到图片大小) DisplayMetrics metrics = new DisplayMetrics(); metrics = context.getApplicationContext().getResources().getDisplayMetrics(); int scaleX = opts.outWidth / metrics.widthPixels; // X轴缩放比例(图片宽度/屏幕宽度) int scaleY = opts.outHeight / metrics.heightPixels; // Y轴缩放比例 int scale = scaleX > scaleY ? scaleX : scaleY; // 图片的缩放比例(X和Y哪个大选哪个) opts.inJustDecodeBounds = false; // 修改选项, 不只解码边界 opts.inSampleSize = scale > 1 ? scale : 1; // 修改选项, 加载图片时的缩放比例 return BitmapFactory.decodeFile(path, opts); // 加载图片(得到缩放后的图片) } /** * 压缩图片清晰度，到指定大小 * * @param image * @return */ public static Bitmap compressImage(Bitmap image) { int maxLength = 1024 * 1024; // (byte) ByteArrayOutputStream baos = new ByteArrayOutputStream(); image.compress(Bitmap.CompressFormat.JPEG, 100, baos);// 质量压缩方法，这里100表示不压缩，把压缩后的数据存放到baos中 int options = 100; while (baos.toByteArray().length > maxLength) { // 循环判断如果压缩后图片是否大于1mb,大于继续压缩 options -= 10;// 每次都减少10 baos.reset();// 重置baos即清空baos image.compress(Bitmap.CompressFormat.JPEG, options, baos);// 这里压缩options%，把压缩后的数据存放到baos中 } ByteArrayInputStream isBm = new ByteArrayInputStream(baos.toByteArray());// 把压缩后的数据baos存放到ByteArrayInputStream中 Bitmap bitmap = BitmapFactory.decodeStream(isBm, null, null);// 把ByteArrayInputStream数据生成图片 return bitmap; } /** * 指定分辨率和清晰度的图片压缩方法 * * @param fromFile * @param toFile * @param reqWidth * @param reqHeight * @param quality */ public static void transImage(String fromFile, String toFile, int reqWidth, int reqHeight, int quality) { Bitmap bitmap = BitmapFactory.decodeFile(fromFile); int bitmapWidth = bitmap.getWidth(); int bitmapHeight = bitmap.getHeight(); // 缩放的尺寸 float scaleWidth = (float) reqWidth / bitmapWidth; float scaleHeight = (float) reqHeight / bitmapHeight; Matrix matrix = new Matrix(); matrix.postScale(scaleWidth, scaleHeight); // 产生缩放后的Bitmap对象 Bitmap resizeBitmap = Bitmap.createBitmap(bitmap, 0, 0, bitmapWidth, bitmapHeight, matrix, false); // 保存到文件 bitmap2File(toFile, quality, resizeBitmap); if (!bitmap.isRecycled()) { // 释放资源，以防止OOM bitmap.recycle(); } if (!resizeBitmap.isRecycled()) { resizeBitmap.recycle(); } } /** * Bitmap转换为文件 * * @param toFile * @param quality * @param bitmap * @return */ public static File bitmap2File(String toFile, int quality, Bitmap bitmap) { File captureFile = new File(toFile); FileOutputStream out = null; try { out = new FileOutputStream(captureFile); if (bitmap.compress(Bitmap.CompressFormat.JPEG, quality, out)) { out.flush(); out.close(); } } catch (FileNotFoundException e) { e.printStackTrace(); } catch (IOException e) { e.printStackTrace(); } return captureFile; } /** * Drawable转换为Bitmap * * @param drawable * @return */ public static Bitmap drawableToBitamp(Drawable drawable) { int w = drawable.getIntrinsicWidth(); int h = drawable.getIntrinsicHeight(); Bitmap.Config config = drawable.getOpacity() != PixelFormat.OPAQUE ? Bitmap.Config.ARGB_8888 : Bitmap.Config.RGB_565; Bitmap bitmap = Bitmap.createBitmap(w, h, config); // 注意，下面三行代码要用到，否在在View或者surfaceview里的canvas.drawBitmap会看不到图 Canvas canvas = new Canvas(bitmap); drawable.setBounds(0, 0, w, h); drawable.draw(canvas); return bitmap; } // Bitmap、Drawable、InputStream、byte[] 之间转换 /**********************************************************/ // 1. Bitmap to InputStream public static InputStream bitmap2Input(Bitmap bitmap, int quality) { ByteArrayOutputStream baos = new ByteArrayOutputStream(); bitmap.compress(Bitmap.CompressFormat.PNG, quality, baos); return new ByteArrayInputStream(baos.toByteArray()); } public static InputStream bitmap2Input(Bitmap bitmap) { ByteArrayOutputStream baos = new ByteArrayOutputStream(); bitmap.compress(Bitmap.CompressFormat.PNG, 100, baos); return new ByteArrayInputStream(baos.toByteArray()); } // 2. Bitmap to byte[] public static byte[] bitmap2ByteArray(Bitmap bitmap, int quality) { ByteArrayOutputStream baos = new ByteArrayOutputStream(); bitmap.compress(Bitmap.CompressFormat.PNG, quality, baos); return baos.toByteArray(); } public static byte[] bitmap2ByteArray(Bitmap bitmap) { ByteArrayOutputStream baos = new ByteArrayOutputStream(); bitmap.compress(Bitmap.CompressFormat.PNG, 100, baos); return baos.toByteArray(); } // 3. Drawable to byte[] public static byte[] drawable2ByteArray(Drawable drawable) { Bitmap bitmap = ((BitmapDrawable) drawable).getBitmap(); ByteArrayOutputStream out = new ByteArrayOutputStream(); bitmap.compress(Bitmap.CompressFormat.PNG, 100, out); return out.toByteArray(); } // 4. byte[] to Bitmap public static Bitmap byteArray2Bitmap(byte[] bytes) { return BitmapFactory.decodeByteArray(bytes, 0, bytes.length); } }

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