【AI】安卓读取图库图片代码流程及步骤

请注意这是一篇AI写的代码，准确性待验证！

创建一个新的Android Studio项目，选择空白活动（Empty Activity）。
在AndroidManifest.xml文件中添加READ_EXTERNAL_STORAGE权限。这是因为您需要读取设备中的图库图片，以便在应用程序中显示它们。

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

在应用程序布局中添加一个RecyclerView视图，用于在应用程序中显示图库图像。RecyclerView视图是用于展示大量数据的可滚动视图，它是用于管理列表或网格数据的最佳方式。
创建一个适配器类，用于将图像加载到RecyclerView视图中。适配器负责处理数据和项目视图之间的关系。
使用ContentResolver查询设备的MediaStore.Images.Media.EXTERNAL_CONTENT_URI媒体库，并检索设备中的所有图像。MediaStore提供了访问设备上所有图像、音频和视频的标准方式。

String[] projection = { MediaStore.Images.Media._ID, MediaStore.Images.Media.DISPLAY_NAME };
String sortOrder = MediaStore.Images.Media.DATE_TAKEN + " DESC";
String selection = null;
String[] selectionArgs = null;
Cursor cursor = getContentResolver().query(MediaStore.Images.Media.EXTERNAL_CONTENT_URI, projection, selection, selectionArgs, sortOrder);

在适配器中，将每个图像绑定到列表项视图中。您可以使用Glide或Picasso等图像加载库来处理这些图像。
最后，在应用程序代码中设置RecyclerView适配器，以便将图像加载到RecyclerView视图中。
MainActivity.java

import android.Manifest;
import android.content.ContentResolver;
import android.database.Cursor;
import android.net.Uri;
import android.os.Build;
import android.os.Bundle;
import android.provider.MediaStore;
import android.widget.Toast;
import androidx.annotation.NonNull;
import androidx.annotation.RequiresApi;
import androidx.appcompat.app.AppCompatActivity;
import androidx.recyclerview.widget.GridLayoutManager;
import androidx.recyclerview.widget.RecyclerView;
import java.util.ArrayList;

public class MainActivity extends AppCompatActivity {
    private RecyclerView recyclerView;
    private ArrayList<String> imagePaths;
    private GalleryAdapter adapter;

    private static final String[] PERMISSIONS = {
            Manifest.permission.READ_EXTERNAL_STORAGE,
            Manifest.permission.WRITE_EXTERNAL_STORAGE
    };
    private static final int PERMISSION_CODE = 123;

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

        recyclerView = findViewById(R.id.recycler_view);
        imagePaths = new ArrayList<>();

        // request for permissions
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
            requestPermissions(PERMISSIONS, PERMISSION_CODE);
        } else {
            loadImages();
        }
    }

    @RequiresApi(api = Build.VERSION_CODES.Q)
    private void loadImages() {
        ContentResolver contentResolver = getContentResolver();
        Uri imageUri = MediaStore.Images.Media.EXTERNAL_CONTENT_URI;
        String[] projection = {MediaStore.Images.Media.DATA, MediaStore.Images.Media.DISPLAY_NAME};

        Cursor cursor = contentResolver.query(imageUri, projection, null, null, null);
        if (cursor != null) {
            while (cursor.moveToNext()) {
                String path = cursor.getString(cursor.getColumnIndexOrThrow(MediaStore.Images.Media.DATA));
                imagePaths.add(path);
            }
            cursor.close();

            adapter = new GalleryAdapter(MainActivity.this, imagePaths);
            recyclerView.setAdapter(adapter);
            recyclerView.setLayoutManager(new GridLayoutManager(MainActivity.this, 3));
        } else {
            Toast.makeText(this, "No Images Found", Toast.LENGTH_SHORT).show();
        }
    }

    @Override
    public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
        super.onRequestPermissionsResult(requestCode, permissions, grantResults);
        if (requestCode == PERMISSION_CODE && grantResults.length > 0 && grantResults[0] == PackageManager.PERMISSION_GRANTED) {
            loadImages();
        } else {
            Toast.makeText(this, "Permission Denied", Toast.LENGTH_SHORT).show();
        }
    }
}

GalleryAdapter.java

import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ImageView;
import androidx.annotation.NonNull;
import androidx.recyclerview.widget.RecyclerView;
import com.bumptech.glide.Glide;
import java.util.ArrayList;

public class GalleryAdapter extends RecyclerView.Adapter<GalleryAdapter.ViewHolder> {
    private Context context;
    private ArrayList<String> imagePaths;

    public GalleryAdapter(Context context, ArrayList<String> imagePaths) {
        this.context = context;
        this.imagePaths = imagePaths;
    }

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

    @Override
    public void onBindViewHolder(@NonNull ViewHolder holder, int position) {
        String path = imagePaths.get(position);

        Glide.with(context).load(path).into(holder.imageView);
    }

    @Override
    public int getItemCount() {
        return image
}

【AI】安卓读取图库图片代码流程及步骤

请注意这是一篇AI写的代码，准确性待验证！

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