Android 图片上传

    implementation 'com.github.LuckSiege.PictureSelector:picture_library:v2.2.4'
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使用

public class MainActivity extends AppCompatActivity {

    ActivityMainBinding binding;


    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        binding=ActivityMainBinding.inflate(getLayoutInflater());
        setContentView(binding.getRoot());

        binding.btnPhoto.setOnClickListener(v -> {
            //拍照
            PictureSelector.create(MainActivity.this)
                    .openCamera(PictureMimeType.ofImage())
                    .forResult(PictureConfig.CHOOSE_REQUEST);
        });

        binding.btnPic.setOnClickListener(v -> {
            //相册
            PictureSelector.create(this)
                    .openGallery(PictureMimeType.ofImage())
                    .maxSelectNum(1)
                    .minSelectNum(1)
                    .imageSpanCount(4)
                    .selectionMode(PictureConfig.MULTIPLE)
                    .forResult(PictureConfig.CHOOSE_REQUEST);

        });

    }


    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        super.onActivityResult(requestCode, resultCode, data);
            switch (requestCode) {
                case PictureConfig.CHOOSE_REQUEST:
                    // 图片选择结果回调
                    List<LocalMedia> images= PictureSelector.obtainMultipleResult(data);
                    for (LocalMedia image : images) {
                        String path = image.getPath();
                        Bitmap bitmap = BitmapUtil.getSmallBitmap(path);
                        binding.img.setImageBitmap(bitmap);
                    }
                    break;
            }
    }
}
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Bitmap 工具类

public class BitmapUtil {

    public static String compressImage(String filePath) {

        //原文件
        File oldFile = new File(filePath);

        //压缩文件路径 照片路径/
        String targetPath = oldFile.getPath();
        int quality = 60;//压缩比例0-100
        Bitmap bm = getSmallBitmap(filePath);//获取一定尺寸的图片

        File outputFile = new File(targetPath);
        try {
            if (!outputFile.exists()) {
                outputFile.getParentFile().mkdirs();
                //outputFile.createNewFile();
            } else {
//                outputFile.delete();//需要注释否则 会删除 相册 原有的图片
            }
            FileOutputStream out = new FileOutputStream(outputFile);
            bm.compress(Bitmap.CompressFormat.JPEG, quality, out);
            out.close();
        } catch (Exception e) {
            e.printStackTrace();
            return filePath;
        }
        return outputFile.getPath();
    }

    /**
     * 根据路径获得图片信息并按比例压缩，返回bitmap
     */
    public static Bitmap getSmallBitmap(String filePath) {
        final BitmapFactory.Options options = new BitmapFactory.Options();
        options.inJustDecodeBounds = true;//只解析图片边沿，获取宽高
        BitmapFactory.decodeFile(filePath, options);
        // 计算缩放比
        options.inSampleSize = calculateInSampleSize(options, 1080, 1920);
        // 完整解析图片返回bitmap
        options.inJustDecodeBounds = false;
        return BitmapFactory.decodeFile(filePath, options);
    }

    // 计算缩放比
    public static int calculateInSampleSize(BitmapFactory.Options options,
                                            int reqWidth, int reqHeight) {
        final int height = options.outHeight;
        final int width = options.outWidth;
        int inSampleSize = 1;
        if (height > reqHeight || width > reqWidth) {
            final int heightRatio = Math.round((float) height / (float) reqHeight);
            final int widthRatio = Math.round((float) width / (float) reqWidth);
            inSampleSize = heightRatio < widthRatio ? heightRatio : widthRatio;
        }
        return inSampleSize;
    }
    public static Bitmap convertViewToBitmap(View view) {

        view.measure(View.MeasureSpec.makeMeasureSpec(0, View.MeasureSpec.UNSPECIFIED), View.MeasureSpec.makeMeasureSpec(0, View.MeasureSpec.UNSPECIFIED));

        view.layout(0, 0, view.getMeasuredWidth(), view.getMeasuredHeight());

        view.buildDrawingCache();

        Bitmap bitmap = view.getDrawingCache();

        return bitmap;

    }
}

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