从图库中选择图像并使用 ImageView 显示它答案

【问题标题】：Choose an image from gallery and show it using an ImageView从图库中选择图像并使用 ImageView 显示它
【发布时间】：2017-12-04 15:31:37
【问题描述】：

private static int RESULT_LOAD = 1;
String img_Decodable_Str;


ImageView imageView = (ImageView) findViewById(R.id.Gallery);
    imageView.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            Intent galleryIntent = new Intent(Intent.ACTION_PICK,
                    android.provider.MediaStore.Images.Media.EXTERNAL_CONTENT_URI);
            // Start the Intent
            startActivityForResult(galleryIntent, RESULT_LOAD);

        }
    });}

@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
    super.onActivityResult(requestCode, resultCode, data);
    try {
        // When an Image is picked
        if (requestCode == RESULT_LOAD && resultCode == RESULT_OK
                && null != data) {
            // Get the Image from data

            Uri selectedImage = data.getData();
            String[] filePathColumn = { MediaStore.Images.Media.DATA };

            // Get the cursor
            Cursor cursor = getContentResolver().query(selectedImage,
                    filePathColumn, null, null, null);
            // Move to first row
            cursor.moveToFirst();

            int columnIndex = cursor.getColumnIndex(filePathColumn[0]);
            img_Decodable_Str = cursor.getString(columnIndex);
            cursor.close();
            ImageView imageView = (ImageView) findViewById(R.id.Gallery);
            // Set the Image in ImageView after decoding the String
            imageView.setImageBitmap(BitmapFactory
                    .decodeFile(img_Decodable_Str));

        } else {
            Toast.makeText(this, "Hey pick your image first",
                    Toast.LENGTH_LONG).show();
        }
    } catch (Exception e) {
        Toast.makeText(this, "Something went embrassing", Toast.LENGTH_LONG)
                .show();
    }

}}

我有一个 ImageView。如果用户点击ImageView，他将能够向其中添加他选择的图像。当我单击 ImageView 时，我被重定向到图库，但是当我选择图像时，该图像未显示在 ImageView 中。我哪里出错了？

【问题讨论】：

标签： android image android-intent onclick gallery

【解决方案1】：

短期内，替换：

        Uri selectedImage = data.getData();
        String[] filePathColumn = { MediaStore.Images.Media.DATA };

        // Get the cursor
        Cursor cursor = getContentResolver().query(selectedImage,
                filePathColumn, null, null, null);
        // Move to first row
        cursor.moveToFirst();

        int columnIndex = cursor.getColumnIndex(filePathColumn[0]);
        img_Decodable_Str = cursor.getString(columnIndex);
        cursor.close();
        ImageView imageView = (ImageView) findViewById(R.id.Gallery);
        // Set the Image in ImageView after decoding the String
        imageView.setImageBitmap(BitmapFactory
                .decodeFile(img_Decodable_Str));

与：

        Uri selectedImage = data.getData();
        imageView.setImageURI(selectedImage);

稍后，使用 Picasso 或 Glide 等图像加载库，因为 setImageURI() 会在主应用程序线程上加载图像，只要该工作需要，它就会冻结您的 UI。

【讨论】：