Unity调用Android保存图片到相册

package com.greengame.pva;import java.io.File;import java.io.FileNotFoundException;import java.io.FileOutputStream;import java.io.IOException;import com.unity3d.player.UnityPlayerNativeActivity;import android.content.Context;import android.content.Intent;import android.graphics.Bitmap;import android.graphics.Bitmap.CompressFormat;import android.graphics.BitmapFactory;import android.net.Uri;import android.os.Bundle;import android.os.Environment;import android.util.Log;import android.widget.Toast;public class MainActivity extends UnityPlayerNativeActivity {    public static Context context;    public static MainActivity mainActivity;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        mainActivity = this;    }    // 保存到相册    public static void savePng(final String fileName) {        context = mainActivity.getApplicationContext();        mainActivity.runOnUiThread(new Runnable() {            public void run() {                Bitmap bitmap = BitmapFactory.decodeFile(Environment                        .getExternalStorageDirectory()                        + "/Android/data/com.greengame.pva/files/"                        + fileName                        + ".png");                File file = new File(Environment.getExternalStorageDirectory()                        + "/DCIM/Camera", fileName + ".jpg");                FileOutputStream fos = null;                try {                    fos = new FileOutputStream(file);                } catch (FileNotFoundException e) {                    // TODO Auto-generated catch block                    Log.w("cat", e.toString());                }                bitmap.compress(CompressFormat.JPEG, 100, fos);                try {                    fos.flush();                } catch (IOException e) {                    // TODO Auto-generated catch block                    Log.w("cat", e.toString());                }                try {                    fos.close();                } catch (IOException e) {                    // TODO Auto-generated catch block                    Log.w("cat", e.toString());                }                bitmap.recycle();                context.sendBroadcast(new Intent(Intent.ACTION_MEDIA_SCANNER_SCAN_FILE, Uri.parse("file://" +Environment.getExternalStorageDirectory()                        + "/DCIM/Camera/"+fileName + ".jpg")));                                Toast.makeText(context, "照片已保存到相册", Toast.LENGTH_SHORT).show();                                            }        });    }}
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