Android：如何将从图库中选择的照片设置为位图

我要求用户以侦听器的身份通过代码访问库：

Intent photoPickerIntent = new Intent(Intent.ACTION_PICK);
photoPickerIntent.setType("image/*");
startActivityForResult(photoPickerIntent, SELECT_PHOTO);

但是，我不知道如何为所选照片设置变量

我将把设置变量为所选照片的代码放在哪里

---

谢谢：）

你可以这样做

@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
    super.onActivityResult(requestCode, resultCode, data);

    // Here we need to check if the activity that was triggers was the Image Gallery.
    // If it is the requestCode will match the LOAD_IMAGE_RESULTS value.
    // If the resultCode is RESULT_OK and there is some data we know that an image was picked.
    if (requestCode == LOAD_IMAGE_RESULTS && resultCode == RESULT_OK && data != null) {
        // Let's read picked image data - its URI
        Uri pickedImage = data.getData();
        // Let's read picked image path using content resolver
        String[] filePath = { MediaStore.Images.Media.DATA };
        Cursor cursor = getContentResolver().query(pickedImage, filePath, null, null, null);
        cursor.moveToFirst();
        String imagePath = cursor.getString(cursor.getColumnIndex(filePath[0]));

        BitmapFactory.Options options = new BitmapFactory.Options();
        options.inPreferredConfig = Bitmap.Config.ARGB_8888;
        Bitmap bitmap = BitmapFactory.decodeFile(imagePath, options);

         // Do something with the bitmap


        // At the end remember to close the cursor or you will end with the RuntimeException!
        cursor.close();
    }
}

---

首先，您必须覆盖onActivityResult

以获取所选图像文件的uri

@Override
protected void onActivityResult(int requestCode, int resultCode, Intent intent) {
    if (requestCode == SELECT_PHOTO) {

        if (resultCode == RESULT_OK) {
            if (intent != null) {
                // Get the URI of the selected file
                final Uri uri = intent.getData();
                useImage(uri);                   
              }
        }
       super.onActivityResult(requestCode, resultCode, intent);

    }
}

然后定义
useImage（Uri）
以使用图像

void useImage(Uri uri)
{
 Bitmap bitmap = MediaStore.Images.Media.getBitmap(this.getContentResolver(), uri);
 //use the bitmap as you like
 imageView.setImageBitmap(bitmap);
}

如果要将所选图像显示到任何特定的ImageView。
假设我们有RC_PHOTO_PICKER=1，那么这几行代码应该会起到神奇的作用

private void openPhotoPicker() {
    Intent photoPickerIntent = new Intent(Intent.ACTION_GET_CONTENT);
    photoPickerIntent.setType("image/*");
    photoPickerIntent.putExtra(Intent.EXTRA_LOCAL_ONLY, false);
    startActivityForResult(Intent.createChooser(photoPickerIntent,"Complete Action Using"), RC_PHOTO_PICKER);
}

@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
    super.onActivityResult(requestCode, resultCode, data);

    if (requestCode == RC_PHOTO_PICKER && resultCode == RESULT_OK && data != null) {
        Uri pickedImage = data.getData();
        //set the selected image to ImageView
        mImageView.setImageURI(pickedImage);
    }
}

然后简单地调用openPhotoPicker（）方法
替代Akash Kurian Jose答案

Bitmap bitmap = MediaStore.Images.Media.getBitmap(this.getContentResolver(), uri);

我总是用

fun getBitmap(file: Uri, cr: ContentResolver): Bitmap?{
            var bitmap: Bitmap ?= null
            try {
                val inputStream = cr.openInputStream(file)
                bitmap = BitmapFactory.decodeStream(inputStream)
                // close stream
                try {
                    inputStream.close()
                } catch (e: IOException) {
                    e.printStackTrace()
                }

            }catch (e: FileNotFoundException){}
            return bitmap
        }

它既适用于画廊的照片，也适用于照相机的照片

更大的问题是：

使用此方法打开库：

private void openGallery(){
    if (Build.VERSION.SDK_INT <19){
        Intent intent = new Intent(); 
        intent.setType("image/*");
        intent.setAction(Intent.ACTION_GET_CONTENT);
        startActivityForResult(Intent.createChooser(intent, getResources().getString(R.string.select_picture)),GALLERY_INTENT_CALLED);
    } else {
        Intent intent = new Intent(Intent.ACTION_OPEN_DOCUMENT);
        intent.addCategory(Intent.CATEGORY_OPENABLE);
        intent.setType("image/*");
        startActivityForResult(intent, GALLERY_KITKAT_INTENT_CALLED);
    }
}

private void openGallery（）{
如果（Build.VERSION.SDK_INT）您能够获取图像路径吗？但是我应该把它放在哪里？只是在onCreate中，还是应该把它放在侦听器中，以便按钮选择它？如果我想保存它创建的bitmp，我可以在名为bitmap的类的开头创建一个变量，然后说“bitmap=BitmapFactory.decodeFile”吗（imagePath，options）；“？另外，感谢您的澄清和帮助：）我不确定我是否理解您的评论问题。但您从galerry返回的图像已经保存，这就是您返回指向该图像的路径的原因。如果需要，您可以直接复制该文件。但将其读入位图可能更有用…这取决于您想做什么您最好检查Activityre中的请求代码苏丹的if声明。