问题描述

使用方法BitmapFactory.decodeFile转化Bitmap时报错：java.lang.RuntimeException: Canvas: trying to draw too large(120422400bytes) bitmap.

解决方案

frameworks/base/graphics/java/android/graphics/RecordingCanvas.javapublic static final int MAX_BITMAP_SIZE = 100 * 1024 * 1024; // 100 MB/** @hide */
@Override
protected void throwIfCannotDraw(Bitmap bitmap) {super.throwIfCannotDraw(bitmap);int bitmapSize = bitmap.getByteCount();if (bitmapSize > MAX_BITMAP_SIZE) {throw new RuntimeException("Canvas: trying to draw too large(" + bitmapSize + "bytes) bitmap.");}
}

//修改前
Bitmap image = BitmapFactory.decodeFile(filePath);
imageView.setImageBitmap(image);//修改后
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.util.DisplayMetrics;File file = new File(filePath);
if (file.exists() && file.length() > 0) {//获取设备屏幕大小DisplayMetrics dm = getResources().getDisplayMetrics();int screenWidth = dm.widthPixels;int screenHeight = dm.heightPixels;//获取图片宽高BitmapFactory.Options options = new BitmapFactory.Options();options.inJustDecodeBounds = true;	BitmapFactory.decodeFile(filePath, options);	float srcWidth = options.outWidth;	float srcHeight = options.outHeight;	//计算缩放比例int inSampleSize = 1;	if (srcHeight > screenHeight || srcWidth > screenWidth) {	if (srcWidth > srcHeight) {	inSampleSize = Math.round(srcHeight / screenHeight);	} else {	inSampleSize = Math.round(srcWidth / screenWidth);	}	}	options.inJustDecodeBounds = false;	options.inSampleSize = inSampleSize;	Bitmap bitmap = BitmapFactory.decodeFile(filePath, options);	imageView.setImageBitmap(bitmap);
}

相关参考：

Android 图片缓存之 Bitmap 详解
https://juejin.cn/post/6844903442939412493

BitmapFactory
https://developer.android.com/reference/android/graphics/BitmapFactory.html

BitmapFactory.options
BitmapFactory.Options类是BitmapFactory对图片进行解码时使用的一个配置参数类，其中定义了一系列的public成员变量，每个成员变量代表一个配置参数。
https://blog.csdn.net/showdy/article/details/54378637