97 lines
3.6 KiB
Java
97 lines
3.6 KiB
Java
package com.ttstd.elderlyassistant.utils;
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import android.content.ContentResolver;
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import android.content.Context;
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import android.database.Cursor;
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import android.net.Uri;
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import android.os.Build;
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import android.os.Environment;
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import android.provider.MediaStore;
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import android.provider.OpenableColumns;
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import android.util.Log;
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import java.io.File;
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import java.io.FileOutputStream;
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import java.io.IOException;
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import java.io.InputStream;
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import java.io.OutputStream;
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public class FileUtils {
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private static final String TAG = "FileUtils";
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public static String getCacheDir(Context context) {
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String cachePath;
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if (Environment.MEDIA_MOUNTED.equals(Environment.getExternalStorageState())
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|| !Environment.isExternalStorageRemovable()) {
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if (context.getExternalCacheDir() != null) {
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cachePath = context.getExternalCacheDir().getPath();
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} else if (context.getExternalFilesDir("cache") != null) {
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cachePath = context.getExternalFilesDir("cache").getPath();
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} else {
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cachePath = context.getCacheDir().getPath();
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}
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} else {
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cachePath = context.getCacheDir().getPath();
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}
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Log.e(TAG, "getCacheDir: " + cachePath);
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return cachePath;
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}
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public static File uriToFile(Context context, Uri uri) throws IOException {
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if (Build.VERSION.SDK_INT < Build.VERSION_CODES.Q) {
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// Android 10 以下用 MediaStore 查询
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File file = uriToFileLegacy(context, uri);
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if (file != null) return file;
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}
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// Android 10+ 或查询失败时使用沙盒复制
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return uriToFileModern(context, uri);
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}
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public static File uriToFileLegacy(Context context, Uri uri) {
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String[] projection = {MediaStore.Images.Media.DATA};
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try (Cursor cursor = context.getContentResolver().query(uri, projection, null, null, null)) {
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if (cursor != null && cursor.moveToFirst()) {
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int columnIndex = cursor.getColumnIndexOrThrow(MediaStore.Images.Media.DATA);
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String filePath = cursor.getString(columnIndex);
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return new File(filePath);
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}
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} catch (Exception e) {
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Log.e("URI_TO_FILE", "Query failed: " + e.getMessage());
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}
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return null;
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}
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public static File uriToFileModern(Context context, Uri uri) throws IOException {
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ContentResolver resolver = context.getContentResolver();
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String fileName = getFileName(resolver, uri); // 获取文件名（见下文辅助方法）
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File cacheDir = context.getExternalCacheDir(); // 建议使用缓存目录
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File outputFile = new File(cacheDir, fileName);
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try (InputStream is = resolver.openInputStream(uri);
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OutputStream os = new FileOutputStream(outputFile)) {
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byte[] buffer = new byte[1024];
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int len;
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while ((len = is.read(buffer)) != -1) {
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os.write(buffer, 0, len);
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}
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}
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return outputFile;
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}
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// 获取文件名辅助方法
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private static String getFileName(ContentResolver resolver, Uri uri) {
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String name = null;
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if (ContentResolver.SCHEME_CONTENT.equals(uri.getScheme())) {
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try (Cursor cursor = resolver.query(uri, null, null, null, null)) {
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if (cursor != null && cursor.moveToFirst()) {
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name = cursor.getString(cursor.getColumnIndex(OpenableColumns.DISPLAY_NAME));
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}
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}
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}
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if (name == null) {
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name = uri.getLastPathSegment(); // 备用方案
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}
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return name;
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}
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}
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