在Android上将大型位图文件的大小调整为缩放输出文件

import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Matrix;

import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;

public class BitmapResizer {

    public static void resizeBitmap(String inputFilePath, String outputFilePath, int outputWidth, int outputHeight) throws IOException {
        // 从文件中加载位图
        BitmapFactory.Options options = new BitmapFactory.Options();
        options.inPreferredConfig = Bitmap.Config.ARGB_8888;
        Bitmap bitmap = BitmapFactory.decodeFile(inputFilePath, options);

        // 创建一个缩放矩阵
        Matrix matrix = new Matrix();
        matrix.postScale((float) outputWidth / bitmap.getWidth(), (float) outputHeight / bitmap.getHeight());

        // 使用缩放矩阵创建一个新的缩放位图
        Bitmap scaledBitmap = Bitmap.createBitmap(bitmap, 0, 0, bitmap.getWidth(), bitmap.getHeight(), matrix, true);

        // 将缩放位图保存到文件中
        ByteArrayOutputStream byteArrayOutputStream = new ByteArrayOutputStream();
        scaledBitmap.compress(Bitmap.CompressFormat.JPEG, 100, byteArrayOutputStream);
        byte[] byteArray = byteArrayOutputStream.toByteArray();
        File outputFile = new File(outputFilePath);
        FileOutputStream fileOutputStream = new FileOutputStream(outputFile);
        fileOutputStream.write(byteArray);
        fileOutputStream.close();
    }
}