如何调整图库中的高质量图像的尺寸以使其出现在图像视图中？

Question

在我的应用程序中，当我打开图库并为图像拍照时，它会出现，但是当此图像质量很高时，图像视图也不会显示任何东西，而在另一部手机中，来自相机的图像也会自动出现

class Horizontal : Fragment() , EasyPermissions.PermissionCallbacks{

    private var currentImage: Bitmap? = null
    override fun onCreateView(
        inflater: LayoutInflater, container: ViewGroup?,
        savedInstanceState: Bundle?
    ): View? { val view =inflater.inflate(R.layout.horizontal, container, false)

        val btng = view.findViewById<View>(R.id.btn_gallery_Hz) as FloatingActionButton

        btng.setOnClickListener {openGallary()
            selectImageInAlbum()}
        btng.scaleType = ImageView.ScaleType.CENTER
        return view}

    private fun selectImageInAlbum() {
        val intent = Intent(Intent.ACTION_GET_CONTENT)
        intent.type = "image/*"
        if (intent.resolveActivity(activity!!.packageManager) != null) {
            startActivityForResult(intent, 1} }




    override fun onStop() {
        super.onStop();if (currentImage != null)
        {currentImage!!.recycle();currentImage = null;System.gc()}}



    override fun onActivityResult(requestCode: Int, resultCode: Int, data: Intent?) {
        super.onActivityResult(requestCode, resultCode, data)
        if (requestCode==2&&resultCode == Activity.RESULT_OK && null != data) {
            val selectedImages = data.data
            val filePathColon = arrayOf(MediaStore.Images.Media.DATA)
            val cursr = this.activity?.contentResolver?.query(selectedImages!!,
                filePathColon, null, null, null)
            cursr!!.moveToFirst()
            val columnindex = cursr.getColumnIndex(filePathColon[0])
            val picturepath = cursr.getString(columnindex)
            cursr.close()
            val intent = Intent(activity, ResHzL::class.java)
            intent.putExtra("asd", picturepath)
            startActivity(intent)}}




    @AfterPermissionGranted(2)
    private fun openGallary() {
        val perms = arrayOf(
            Manifest.permission.WRITE_EXTERNAL_STORAGE,
            Manifest.permission.READ_EXTERNAL_STORAGE)
        if (EasyPermissions.hasPermissions(this.activity!!, *perms)) {

            // Toast.makeText(activity, "Opening gallary", Toast.LENGTH_SHORT)
        } else {EasyPermissions.requestPermissions(this,
            getString(R.string.weneedper), 2, *perms) }}
    override fun onRequestPermissionsResult(
        requestCode: Int, permissions: Array<String>, grantResults: IntArray
    ) { super.onRequestPermissionsResult(requestCode, permissions, grantResults)
        EasyPermissions.onRequestPermissionsResult(requestCode, permissions, grantResults, this)}
    override fun onPermissionsDenied(requestCode: Int, perms: MutableList<String>) {
        if (EasyPermissions.somePermissionPermanentlyDenied(this, perms)) {
            AppSettingsDialog.Builder(this).build().show()}}
    override fun onPermissionsGranted(requestCode: Int, perms: MutableList<String>) {}}

在其他活动中，我用它来显示图像

val imageView = findViewById<View>(R.id.mainImg_Hz) as ImageView
        imageView.setImageBitmap(BitmapFactory.decodeFile(intent.getStringExtra("asd")))

有人可以帮忙吗？

Answer 1

首先，您需要处理此图像，以便减小尺寸并保持质量。 您需要运行后台任务，以便在大图像处理过程中设备不会起毛。

然后，您可以在此过程中显示一个进度对话框，只需将此代码添加到onCreate活动中即可。

public ProgressDialog progressDialog;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);

progressDialog = new ProgressDialog(MyProfileEidtActivity.this);
progressDialog.setMessage("Loading ...");


// just execute this process

new ImageProcessing().execute("YOUR IMAGE PATH");
}


public class ImageProcessing extends AsyncTask<String, Void, String> {

@Override
protected void onPreExecute() {
    super.onPreExecute();
    progressDialog.setMessage("Image Processing");
    progressDialog.setCancelable(false);
    progressDialog.show();
}

@Override
protected String doInBackground(String... strings) {
    Bitmap mainImage = null;
    Bitmap converetdImage = null;
    ByteArrayOutputStream bos = null;
    byte[] bt = null;
    String encodeString = null;
    try {
        mainImage = BitmapFactory.decodeFile(strings[0]);

    /// 500 means image size will be maximum 500 kb

        converetdImage = getResizedBitmap(mainImage, 500);
        bos = new ByteArrayOutputStream();
        converetdImage.compress(Bitmap.CompressFormat.JPEG, 50, bos);
        bt = bos.toByteArray();
        encodeString = Base64.encodeToString(bt, Base64.DEFAULT);
    } catch (Exception e) {
        e.printStackTrace();
    }
    return encodeString;
 }

@Override
protected void onPostExecute(String image) {
    super.onPostExecute(s);
    progressDialog.dismiss();

 // this image will be your reduced image path

}
 }

public Bitmap getResizedBitmap(Bitmap image, int maxSize) {
int width = image.getWidth();
int height = image.getHeight();

float bitmapRatio = (float) width / (float) height;
if (bitmapRatio > 1) {
    width = maxSize;
    height = (int) (width / bitmapRatio);
} else {
    height = maxSize;
    width = (int) (height * bitmapRatio);
}
return Bitmap.createScaledBitmap(image, width, height, true);
}