Android Studio拍照裁剪

Android Studio拍照裁剪的方法如下：
1. 首先，在`AndroidManifest.xml`文件中添加以下权限：

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

2. 在你的Activity中，添加以下代码来打开相机拍照：

private static final int REQUEST_IMAGE_CAPTURE = 1;
private Uri imageUri;

private void dispatchTakePictureIntent() {
    Intent takePictureIntent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
    if (takePictureIntent.resolveActivity(getPackageManager()) != null) {
        // 创建一个临时文件来保存拍摄的照片
        File photoFile = null;
        try {
            photoFile = createImageFile();
        } catch (IOException ex) {
            // 错误处理
        }
        if (photoFile ! null) {
            // 获取文件的URI
            imageUri = FileProvider.getUriForFile(this,
                    "com.example.android.fileprovider",
                    photoFile);
            // 将URI添加到Intent中
            takePictureIntent.putExtra(MediaStore.EXTRA_OUTPUT, imageUri);
            // 启动相机
            startActivityForResult(takePictureIntent, REQUEST_IMAGE_CAPTURE);
        }
    }
}

private File createImageFile() throws IOException {
    // 创建一个唯一的文件名
    String timeStamp = new SimpleDateFormat("yyyyMMdd_HHmmss").format(new Date());
    String imageFileName = "JPEG_" + timeStamp + "_";
    File storageDir = getExternalFilesDir(Environment.DIRECTORY_PICTURES);
    File image = File.createTempFile(
            imageFileName,  /* 前缀 */
            ".jpg",         /* 后缀 */
            storageDir      /* 目录 */
    );
    return image;}

3. 在`onActivityResult`方法中，处理拍摄完成后的图片裁剪：

private static final int REQUEST_IMAGE_CROP = 2;

@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
    super.onActivityResult(requestCode, resultCode, data);
    if (requestCode == REQUEST_IMAGE_CAPTURE && resultCode == RESULT_OK) {
        // 启动裁剪
        performCrop();
    } else if (requestCode == REQUEST_IMAGE_CROP && resultCode == RESULT_OK) {
        // 获取裁剪后的图片
        Bundle extras = data.getExtras();
        Bitmap croppedBitmap = (Bitmap) extras.get("data");
        // 在ImageView中显示裁剪后的图片
        imageView.setImageBitmap(croppedBitmap);
    }
}

private void performCrop() {
    try {
        // 创建临时文件，用于保存裁剪后的图片
        File cropFile = createImageFile();
        Uri cropUri = FileProvider.getUriForFile(this,
                "com.example.android.fileprovider",
                cropFile);

        // 启动裁剪Intent
        Intent cropIntent = new Intent("com.android.camera.action.CROP");
        cropIntent.setDataAndType(imageUri, "image/*");
        cropIntent.addFlags(Intent.FLAG_GRANT_READ_URI_PERMISSION);
        cropIntent.addFlags(Intent.FLAG_GRANT_WRITE_URI_PERMISSION);
        cropIntent.putExtra("crop", "true");
        cropIntent.putExtra("aspectX", 1);
        cropIntent.putExtra("aspectY", 1);
        cropIntent.putExtra(MediaStore.EXTRA_OUTPUT, cropUri);
        cropIntent.putExtra("return-data", true);
        startActivityForResult(cropIntent, REQUEST_IMAGE_CROP);
    } catch (IOException ex) {
        // 错误处理
    }
}