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

import android.Manifest;
import android.content.pm.PackageManager;
import android.os.Bundle;
import android.widget.Toast;
import androidx.annotation.NonNull;
import androidx.appcompat.app.AppCompatActivity;
import androidx.core.app.ActivityCompat;
import androidx.core.content.ContextCompat;

public class MainActivity extends AppCompatActivity {
    private static final int PERMISSION_REQUEST_CODE = 1;

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

        // 檢查是否已經(jīng)授予存儲(chǔ)權(quán)限
        if (ContextCompat.checkSelfPermission(this, Manifest.permission.READ_EXTERNAL_STORAGE)
                != PackageManager.PERMISSION_GRANTED) {
            // 如果沒(méi)有授予權(quán)限，則請(qǐng)求權(quán)限
            ActivityCompat.requestPermissions(this,
                    new String[]{Manifest.permission.READ_EXTERNAL_STORAGE},
                    PERMISSION_REQUEST_CODE);
        } else {
            // 已經(jīng)授予權(quán)限，執(zhí)行相關(guān)操作
            performStorageOperation();
        }
    }

    @Override
    public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions,
                                           @NonNull int[] grantResults) {
        super.onRequestPermissionsResult(requestCode, permissions, grantResults);
        if (requestCode == PERMISSION_REQUEST_CODE) {
            if (grantResults.length > 0 && grantResults[0] == PackageManager.PERMISSION_GRANTED) {
                // 用戶(hù)授予了權(quán)限，執(zhí)行相關(guān)操作
                performStorageOperation();
            } else {
                // 用戶(hù)拒絕了權(quán)限，給出提示
                Toast.makeText(this, "存儲(chǔ)權(quán)限被拒絕，無(wú)法執(zhí)行操作", Toast.LENGTH_SHORT).show();
            }
        }
    }

    private void performStorageOperation() {
        // 執(zhí)行存儲(chǔ)相關(guān)操作
        Toast.makeText(this, "開(kāi)始執(zhí)行存儲(chǔ)操作", Toast.LENGTH_SHORT).show();
    }
}

import android.content.Context;
import android.os.Bundle;
import android.widget.Toast;
import androidx.appcompat.app.AppCompatActivity;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;

public class StorageActivity extends AppCompatActivity {
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_storage);

        // 獲取應(yīng)用的外部存儲(chǔ)專(zhuān)屬目錄
        File externalFilesDir = getExternalFilesDir(null);
        if (externalFilesDir != null) {
            // 創(chuàng)建一個(gè)文件
            File file = new File(externalFilesDir, "test.txt");
            try {
                // 寫(xiě)入文件
                FileOutputStream fos = new FileOutputStream(file);
                String content = "Hello, World!";
                fos.write(content.getBytes());
                fos.close();
                Toast.makeText(this, "文件寫(xiě)入成功", Toast.LENGTH_SHORT).show();
            } catch (IOException e) {
                e.printStackTrace();
                Toast.makeText(this, "文件寫(xiě)入失敗", Toast.LENGTH_SHORT).show();
            }
        }
    }
}

import android.content.ContentResolver;
import android.database.Cursor;
import android.net.Uri;
import android.os.Bundle;
import android.provider.MediaStore;
import android.widget.Toast;
import androidx.appcompat.app.AppCompatActivity;

public class MediaAccessActivity extends AppCompatActivity {
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_media_access);

        // 獲取 ContentResolver
        ContentResolver contentResolver = getContentResolver();
        // 定義查詢(xún)的 URI
        Uri uri = MediaStore.Images.Media.EXTERNAL_CONTENT_URI;
        // 定義查詢(xún)的列
        String[] projection = {MediaStore.Images.Media._ID, MediaStore.Images.Media.DISPLAY_NAME};
        // 執(zhí)行查詢(xún)
        Cursor cursor = contentResolver.query(uri, projection, null, null, null);
        if (cursor != null) {
            while (cursor.moveToNext()) {
                // 獲取圖片的 ID 和文件名
                long id = cursor.getLong(cursor.getColumnIndexOrThrow(MediaStore.Images.Media._ID));
                String displayName = cursor.getString(cursor.getColumnIndexOrThrow(MediaStore.Images.Media.DISPLAY_NAME));
                Toast.makeText(this, "圖片 ID: " + id + ", 文件名: " + displayName, Toast.LENGTH_SHORT).show();
            }
            cursor.close();
        }
    }
}