用java代码实现安卓13的照片选择器代码

以下是使用Android官方提供的图片选择器库实现的示例代码：

1. 首先，在app的build.gradle文件中添加以下依赖：

dependencies {
    implementation 'com.android.support:appcompat-v7:28.0.0'
    implementation 'com.android.support:recyclerview-v7:28.0.0'
    implementation 'com.android.support:design:28.0.0'
    implementation 'com.github.bumptech.glide:glide:4.8.0'
    implementation 'com.github.bumptech.glide:compiler:4.8.0'
    implementation 'com.yalantis:ucrop:2.2.2'
}

2. 在AndroidManifest.xml文件中添加以下权限：

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

3. 创建一个Activity用于选择图片，例如SelectImageActivity.java：

public class SelectImageActivity extends AppCompatActivity {

    private static final int REQUEST_CODE_SELECT_IMAGE = 100;

    private RecyclerView mRecyclerView;
    private ImageAdapter mAdapter;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_select_image);

        mRecyclerView = findViewById(R.id.recycler_view);
        mRecyclerView.setLayoutManager(new GridLayoutManager(this, 3));

        mAdapter = new ImageAdapter(this);
        mRecyclerView.setAdapter(mAdapter);

        findViewById(R.id.btn_select_image).setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Intent intent = new Intent(Intent.ACTION_PICK, MediaStore.Images.Media.EXTERNAL_CONTENT_URI);
                startActivityForResult(intent, REQUEST_CODE_SELECT_IMAGE);
            }
        });
    }

    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        if (resultCode == RESULT_OK && requestCode == REQUEST_CODE_SELECT_IMAGE && data != null) {
            Uri uri = data.getData();
            if (uri != null) {
                startCrop(uri);
            }
        }
        super.onActivityResult(requestCode, resultCode, data);
    }

    private void startCrop(Uri uri) {
        String destinationFileName = "crop_image.jpg";
        UCrop uCrop = UCrop.of(uri, Uri.fromFile(new File(getCacheDir(), destinationFileName)));
        uCrop.withAspectRatio(1, 1);
        uCrop.withMaxResultSize(800, 800);
        uCrop.start(this);
    }

    @Override
    protected void onDestroy() {
        super.onDestroy();
        mAdapter.onDestroy();
    }
}

4. 创建一个Adapter用于显示图片，例如ImageAdapter.java：

public class ImageAdapter extends RecyclerView.Adapter<ImageAdapter.ViewHolder> {

    private Context mContext;
    private List<String> mImages;
    private RequestOptions mRequestOptions;

    private OnItemClickListener mListener;

    private Disposable mDisposable;

    public interface OnItemClickListener {
        void onItemClick(String imagePath);
    }

    public ImageAdapter(Context context) {
        mContext = context;
        mRequestOptions = new RequestOptions()
                .centerCrop()
                .diskCacheStrategy(DiskCacheStrategy.ALL);
        mImages = new ArrayList<>();
        mDisposable = Observable.just("")
                .observeOn(Schedulers.io())
                .map(new Function<String, List<String>>() {
                    @Override
                    public List<String> apply(String s) throws Exception {
                        return getImagePaths();
                    }
                })
                .observeOn(AndroidSchedulers.mainThread())
                .subscribe(new Consumer<List<String>>() {
                    @Override
                    public void accept(List<String> strings) throws Exception {
                        mImages.clear();
                        mImages.addAll(strings);
                        notifyDataSetChanged();
                    }
                });
    }

    @NonNull
    @Override
    public ViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
        View view = LayoutInflater.from(mContext).inflate(R.layout.item_image, parent, false);
        return new ViewHolder(view);
    }

    @Override
    public void onBindViewHolder(@NonNull ViewHolder holder, int position) {
        String imagePath = mImages.get(position);
        Glide.with(mContext)
                .load(new File(imagePath))
                .apply(mRequestOptions)
                .into(holder.imageView);
    }

    @Override
    public int getItemCount() {
        return mImages.size();
    }

    public void setOnItemClickListener(OnItemClickListener listener) {
        mListener = listener;
    }

    public void onDestroy() {
        mDisposable.dispose();
    }

    private List<String> getImagePaths() {
        List<String> paths = new ArrayList<>();
        String[] projection = new String[]{MediaStore.Images.Media.DATA};
        Cursor cursor = mContext.getContentResolver().query(MediaStore.Images.Media.EXTERNAL_CONTENT_URI, projection, null, null, MediaStore.Images.Media.DATE_ADDED + " DESC");
        if (cursor != null) {
            while (cursor.moveToNext()) {
                String path = cursor.getString(cursor.getColumnIndexOrThrow(MediaStore.Images.Media.DATA));
                paths.add(path);
            }
            cursor.close();
        }
        return paths;
    }

    class ViewHolder extends RecyclerView.ViewHolder {

        ImageView imageView;

        ViewHolder(View itemView) {
            super(itemView);
            imageView = itemView.findViewById(R.id.image_view);
            itemView.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View v) {
                    if (mListener != null) {
                        mListener.onItemClick(mImages.get(getAdapterPosition()));
                    }
                }
            });
        }
    }
}

5. 创建一个布局文件用于显示图片，例如item_image.xml：

<ImageView xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/image_view"
    android:layout_width="match_parent"
    android:layout_height="match_parent"/>

6. 创建一个布局文件用于选择图片，例如activity_select_image.xml：

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

  <android.support.v7.widget.RecyclerView
      android:id="@+id/recycler_view"
      android:layout_width="match_parent"
      android:layout_height="match_parent"
      android:layout_above="@+id/btn_select_image"
      android:scrollbars="vertical"/>

  <Button
      android:id="@+id/btn_select_image"
      android:layout_width="match_parent"
      android:layout_height="wrap_content"
      android:layout_alignParentBottom="true"
      android:text="选择图片"/>

</RelativeLayout>

7. 在需要调用图片选择器的地方，启动SelectImageActivity：

Intent intent = new Intent(this, SelectImageActivity.class);
startActivity(intent);

以上就是使用Android官方提供的图片选择器库实现安卓13的照片选择器代码的示例。