您可以嘗試一下,如果嘗試失敗,則返回null.或者你可以將你的嘗試分解成小塊來監視失敗的地方.

/**

* This method will return the JSONObject q0, if it exists

* If it doesn't exist it will return NULL

*

*/

private JSONObject getQZero(JSONObject json)

{

try

{

return json.getJSONObject("queue").getJSONObject("building").getJSONObject("q0");

}

catch (JSONException e)

{

// This could be triggered either because there is no q0

// or because the JSON structure is different from what was expected.

return null;

}

}

如果你想打印每個級別的日志,你也可以一步一步走;

/**

* This method will show where your jsonparsing fails.

* It will throw a JSONOException if the json is way different from what

* was expected, and otherwise it will print a log of where the parsing

* failed.

*/

private JSONObject getQZero(JSONObject json) throws JSONException

{

// Stop if no queue

if (! myObject.has("queue")

{

Log.d(TAG, "no queue!");

return null;

}

JSONObject queue = myObject.getJSONObject("queue");

// Stop if no building

if (! queue.has("building")

{

Log.d(TAG, "no building!");

return null;

}

JSONObject building = queue.getJSONObject("building")

// Stop if no q0

if (! building.has("q0"))

{

Log.d(TAG, "no q0!");

return null;

}

JSONObject q0 = building.getJSONObject("q0");

// Q0 is returned here. If the method returned earlier, it returned NULL

// You could also do nested ifs, but the indentation gets crazy

return q0;

}

總結

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