如何處理異常並防止崩潰應用程序

Question

我正在使用Amazon AWS SDK從S3下載圖像。偶爾，當找不到圖像時，會拋出異常「AmazonS3Exception：Status Code：404」。但是，這似乎是一個例外，不應該使應用程序崩潰。我如何處理這個異常，以便它不會崩潰應用程序？道歉，我是Android的Java & noob。

Answer 1

要跟進型a1pha的回答是：

如果你想優雅地處理異常，你會使用try-catch語句。它的工作原理是這樣的：

try { 
    // Here you put the code that may throw an exception 
} catch (AmazonS3Exception e) { 
    // Looks like we errored out, log the exception and 
    // tell the user that we 404'd 
    Log.e(TAG, "Error fetching file from Amazon S3", e); 
    Toast.makeText(context, "Error 404 while fetching file: file not found", Toast.LENGTH_SHORT).show(); 
    // Insert any other code you need here to recover from the error 
} finally { 
    // Note that the finally part is optional but useful if you want 
    // to do something after the try-catch statement is finished 
    // for example, if you were using an inputStream: 
    inputStream.close(); 
} 

Answer 2

try{ 
    //code throwing exception 
} catch (AmazonS3Exception) {}