package com.lcjian.library.okhttp.utils;
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import android.graphics.BitmapFactory;
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import android.util.DisplayMetrics;
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import android.view.View;
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import android.view.ViewGroup;
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import android.widget.ImageView;
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import java.io.InputStream;
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import java.lang.reflect.Field;
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/**
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* Created by zhy on 15/11/6.
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*/
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public class ImageUtils
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{
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/**
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* 根据InputStream获取图片实际的宽度和高度
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*
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* @param imageStream
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* @return
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*/
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public static ImageSize getImageSize(InputStream imageStream)
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{
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BitmapFactory.Options options = new BitmapFactory.Options();
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options.inJustDecodeBounds = true;
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BitmapFactory.decodeStream(imageStream, null, options);
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return new ImageSize(options.outWidth, options.outHeight);
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}
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public static class ImageSize
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{
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int width;
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int height;
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public ImageSize()
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{
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}
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public ImageSize(int width, int height)
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{
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this.width = width;
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this.height = height;
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}
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@Override
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public String toString()
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{
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return "ImageSize{" +
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"width=" + width +
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", height=" + height +
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'}';
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}
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}
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public static int calculateInSampleSize(ImageSize srcSize, ImageSize targetSize)
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{
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// 源图片的宽度
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int width = srcSize.width;
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int height = srcSize.height;
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int inSampleSize = 1;
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int reqWidth = targetSize.width;
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int reqHeight = targetSize.height;
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if (width > reqWidth && height > reqHeight)
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{
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// 计算出实际宽度和目标宽度的比率
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int widthRatio = Math.round((float) width / (float) reqWidth);
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int heightRatio = Math.round((float) height / (float) reqHeight);
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inSampleSize = Math.max(widthRatio, heightRatio);
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}
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return inSampleSize;
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}
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/**
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* 根据ImageView获适当的压缩的宽和高
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*
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* @param view
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* @return
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*/
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public static ImageSize getImageViewSize(View view)
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{
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ImageSize imageSize = new ImageSize();
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imageSize.width = getExpectWidth(view);
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imageSize.height = getExpectHeight(view);
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return imageSize;
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}
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/**
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* 根据view获得期望的高度
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*
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* @param view
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* @return
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*/
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private static int getExpectHeight(View view)
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{
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int height = 0;
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if (view == null) return 0;
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final ViewGroup.LayoutParams params = view.getLayoutParams();
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//如果是WRAP_CONTENT，此时图片还没加载，getWidth根本无效
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if (params != null && params.height != ViewGroup.LayoutParams.WRAP_CONTENT)
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{
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height = view.getWidth(); // 获得实际的宽度
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}
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if (height <= 0 && params != null)
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{
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height = params.height; // 获得布局文件中的声明的宽度
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}
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if (height <= 0)
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{
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height = getImageViewFieldValue(view, "mMaxHeight");// 获得设置的最大的宽度
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}
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//如果宽度还是没有获取到，憋大招，使用屏幕的宽度
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if (height <= 0)
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{
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DisplayMetrics displayMetrics = view.getContext().getResources()
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.getDisplayMetrics();
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height = displayMetrics.heightPixels;
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}
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return height;
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}
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/**
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* 根据view获得期望的宽度
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*
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* @param view
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* @return
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*/
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private static int getExpectWidth(View view)
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{
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int width = 0;
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if (view == null) return 0;
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final ViewGroup.LayoutParams params = view.getLayoutParams();
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//如果是WRAP_CONTENT，此时图片还没加载，getWidth根本无效
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if (params != null && params.width != ViewGroup.LayoutParams.WRAP_CONTENT)
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{
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width = view.getWidth(); // 获得实际的宽度
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}
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if (width <= 0 && params != null)
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{
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width = params.width; // 获得布局文件中的声明的宽度
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}
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if (width <= 0)
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{
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width = getImageViewFieldValue(view, "mMaxWidth");// 获得设置的最大的宽度
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}
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//如果宽度还是没有获取到，憋大招，使用屏幕的宽度
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if (width <= 0)
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{
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DisplayMetrics displayMetrics = view.getContext().getResources()
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.getDisplayMetrics();
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width = displayMetrics.widthPixels;
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}
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return width;
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}
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/**
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* 通过反射获取imageview的某个属性值
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*
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* @param object
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* @param fieldName
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* @return
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*/
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private static int getImageViewFieldValue(Object object, String fieldName)
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{
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int value = 0;
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try
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{
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Field field = ImageView.class.getDeclaredField(fieldName);
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field.setAccessible(true);
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int fieldValue = field.getInt(object);
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if (fieldValue > 0 && fieldValue < Integer.MAX_VALUE)
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{
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value = fieldValue;
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}
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} catch (Exception e)
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{
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}
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return value;
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}
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}
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