x、Android保存图片至相册原生代码

package com.xxx.NativeCode;

import android.app.AlertDialog;
import android.content.Context;
import android.content.Intent;
import android.net.Uri;
import android.os.Environment;
import android.text.format.Time;

import com.unity3d.player.UnityPlayer;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;

/**
 * Created by wanshichen on 2017/3/16.
 */

public class NativeCodeHandle {
    public static void SaveImageToAlbum(String fromPath) {
        Time t = new Time();
        t.setToNow();
        final String toPath = Environment.getExternalStorageDirectory() + String.format("/DCIM/Camera/IMG_xxx_%d%d%d_%d%d%d.jpg", t.year, t.month, t.monthDay, t.hour, t.minute, t.second);
        CopyFileTo(fromPath, toPath);
        UnityPlayer.currentActivity.runOnUiThread(new Runnable() {
            @Override
            public void run() {
                scanPhotos(toPath, UnityPlayer.currentActivity);
                AlertDialog.Builder builder = new AlertDialog.Builder(UnityPlayer.currentActivity)
                        .setTitle("提示")
                        .setMessage("保存成功")
                        .setPositiveButton("确定", null);
                builder.show();
            }
        });
    }

    public static void CopyFileTo(String fromPath, String toPath) {
        FileInputStream fis = null;
        FileOutputStream fos = null;
        try {
            fis = new FileInputStream(fromPath);
            fos = new FileOutputStream(toPath);
            byte[] buffer = new byte[1024];
            int byteread = 0;
            while ((byteread = fis.read(buffer)) != -1) {
                fos.write(buffer, 0, byteread);
            }
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            try {
                if (fis != null) {
                    fis.close();
                }
                if (fos != null) {
                    fos.close();
                }
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    }


    public static void scanPhotos(String filePath, Context context) {
        Intent intent = new Intent(Intent.ACTION_MEDIA_SCANNER_SCAN_FILE);
        intent.setData(Uri.fromFile(new File(filePath)));
        context.sendBroadcast(intent);
    }
}