由於近由於工作需要，要實現在已經發布的APP上實現更新啟動圖片，發現網上沒有這塊的資訊，雖然實現方式比較簡單，但還是寫下來，供參考；

1、首先，用一個介面訪問網路，下載新的啟動畫面的圖片，我用的是ImageView裡面的一張畫面來實現的，程式碼如下：

View tempView = mGridView.getChildAt(0);
		ImageView imageView = (ImageView) tempView
				.findViewById(R.id.gv_image_detail);
		File file = ImageUtils.saveSplashImageToSdCard(imageView);
 

public static final File saveSplashImageToSdCard(ImageView image) {
    	boolean success = false;
    	String imageName = "splash.jpg";
    	File storeDir = AppData.getContext().getExternalFilesDir(null);
    	File imageFile = new File(storeDir, imageName);
    	F.makeLog(imageFile.toString());
    	BitmapDrawable drawable = (BitmapDrawable) image.getDrawable();
    	FileOutputStream outStream;
		Bitmap bitmap = drawable.getBitmap();
		try {
			outStream = new FileOutputStream(imageFile);
			bitmap.compress(Bitmap.CompressFormat.PNG, 100, outStream);
//			 100 to keep full quality of the image 
			outStream.flush();
			outStream.close();
			success = true;
		} catch (FileNotFoundException e) {
			e.printStackTrace();
		} catch (IOException e) {
			e.printStackTrace();
		}
		if (success) {
//			Toast.makeText(getApplicationContext(), "Image saved with success",
//					Toast.LENGTH_LONG).show();
			F.makeLog("success save to sd card");
			UserInfo.saveSplashPath(imageFile.toString());
			return imageFile;
		} else {
					return null;
		}
    }
 

public static void saveSplashPath(String msg) {
		SharedPreferences sharedPreferences = AppData.getContext()
				.getSharedPreferences(USER_INFO_TAG, Context.MODE_PRIVATE);
		SharedPreferences.Editor editor = sharedPreferences.edit();
		editor.putString(FILE_TAG, msg);
		editor.putBoolean(SPLASH_TAG, true);
		editor.commit();
	}
	
	public static boolean isSplashImageChange() {
		SharedPreferences sharedPreferences = AppData.getContext()
				.getSharedPreferences(USER_INFO_TAG, Context.MODE_PRIVATE);
		boolean change = sharedPreferences.getBoolean(SPLASH_TAG, false);
		return change;
	}
	
	public static String getSplashImagePath() {
		SharedPreferences sharedPreferences = AppData.getContext()
				.getSharedPreferences(USER_INFO_TAG, Context.MODE_PRIVATE);
		String path = sharedPreferences.getString(FILE_TAG, "0");
		return path;
	}
 

if (UserInfo.isSplashImageChange()) {
			String file = UserInfo.getSplashImagePath();
			F.makeLog(file.toString());
//			F.makeToast(file.toString());
			Bitmap bitmap = BitmapFactory.decodeFile(file);
			imageView.setImageBitmap(bitmap);
		}

由於是上班時間，偷偷來更新部落格的，寫的很是簡略，不過應該可以看懂的吧，程式碼是整合在公司的專案中，不好上原始碼，望海涵。