Android拍照或者从相册选取图片加载在imageview上

好的，以下是Android拍照或者从相册选取图片加载在imageview上的具体步骤：

1. 在AndroidManifest.xml文件中添加相机和存储权限：

<uses-permission android:name="android.permission.CAMERA" />
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />

2. 在布局文件中添加一个ImageView：

<ImageView
    android:id="@+id/imageView"
    android:layout_width="match_parent"
    android:layout_height="match_parent"/>

3. 在Activity中定义以下变量：

private static final int REQUEST_IMAGE_CAPTURE = 1;
private static final int REQUEST_IMAGE_PICK = 2;
private ImageView imageView;
private Uri imageUri;

4. 在需要拍照或者从相册选取图片的地方，添加以下代码：

拍照：

Intent takePictureIntent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
if (takePictureIntent.resolveActivity(getPackageManager()) != null) {
    File photoFile = null;
    try {
        photoFile = createImageFile();
    } catch (IOException e) {
        e.printStackTrace();
    }
    if (photoFile != null) {
        imageUri = FileProvider.getUriForFile(this, "com.example.fileprovider", photoFile);
        takePictureIntent.putExtra(MediaStore.EXTRA_OUTPUT, imageUri);
        startActivityForResult(takePictureIntent, REQUEST_IMAGE_CAPTURE);
    }
}

从相册选取图片：

Intent pickPhotoIntent = new Intent(Intent.ACTION_PICK, android.provider.MediaStore.Images.Media.EXTERNAL_CONTENT_URI);
startActivityForResult(pickPhotoIntent, REQUEST_IMAGE_PICK);

5. 在Activity中添加以下方法：

@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
    super.onActivityResult(requestCode, resultCode, data);
    if (resultCode == RESULT_OK) {
        if (requestCode == REQUEST_IMAGE_CAPTURE) {
            imageView.setImageURI(imageUri);
        } else if (requestCode == REQUEST_IMAGE_PICK) {
            imageUri = data.getData();
            imageView.setImageURI(imageUri);
        }
    }
}

private File createImageFile() throws IOException {
    String timeStamp = new SimpleDateFormat("yyyyMMdd_HHmmss").format(new Date());
    String imageFileName = "JPEG_" + timeStamp + "_";
    File storageDir = getExternalFilesDir(Environment.DIRECTORY_PICTURES);
    File imageFile = File.createTempFile(imageFileName, ".jpg", storageDir);
    return imageFile;
}

以上就是Android拍照或者从相册选取图片加载在ImageView上的完整代码，希望可以帮助到你。