Android图片的处理工具类BitmapUtils，供大家参考，具体内容如下
项目中经常会用到图片，所以在这先简单的总结一下。闲言少叙，上代码。
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;
public class BitmapUtils {
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)
}
public static Bitmap comp(Context context, String path) {
return compressImage(getUsableImage(context, path));
}
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)
}
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;
}
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();
}
}
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;
}
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);
}
}
以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持考高分网。
