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);  }}