我一直在創建一個應用程序,建立在目標sdk版本15上,並且最低sdk版本爲8.當我在運行版本8的設備上運行它時,每件事情都運行得很完美。但是當我嘗試使用高於版本10的任何東西,它會崩潰,並出現NullPointerException異常。應用程序在較高版本的Android上崩潰
的logcat的給了我這樣的:
10-06 19:23:12.927: E/AndroidRuntime(589): FATAL EXCEPTION: main
10-06 19:23:12.927: E/AndroidRuntime(589): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.fansheroid.facts.chicks/com.fansheroid.facts.chicks.MainActivity}: java.lang.NullPointerException
10-06 19:23:12.927: E/AndroidRuntime(589): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1955)
10-06 19:23:12.927: E/AndroidRuntime(589): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1980)
10-06 19:23:12.927: E/AndroidRuntime(589): at android.app.ActivityThread.access$600(ActivityThread.java:122)
10-06 19:23:12.927: E/AndroidRuntime(589): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1146)
10-06 19:23:12.927: E/AndroidRuntime(589): at android.os.Handler.dispatchMessage(Handler.java:99)
10-06 19:23:12.927: E/AndroidRuntime(589): at android.os.Looper.loop(Looper.java:137)
10-06 19:23:12.927: E/AndroidRuntime(589): at android.app.ActivityThread.main(ActivityThread.java:4340)
10-06 19:23:12.927: E/AndroidRuntime(589): at java.lang.reflect.Method.invokeNative(Native Method)
10-06 19:23:12.927: E/AndroidRuntime(589): at java.lang.reflect.Method.invoke(Method.java:511)
10-06 19:23:12.927: E/AndroidRuntime(589): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:784)
10-06 19:23:12.927: E/AndroidRuntime(589): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:551)
10-06 19:23:12.927: E/AndroidRuntime(589): at dalvik.system.NativeStart.main(Native Method)
10-06 19:23:12.927: E/AndroidRuntime(589): Caused by: java.lang.NullPointerException
10-06 19:23:12.927: E/AndroidRuntime(589): at org.json.JSONTokener.nextCleanInternal(JSONTokener.java:116)
10-06 19:23:12.927: E/AndroidRuntime(589): at org.json.JSONTokener.nextValue(JSONTokener.java:94)
10-06 19:23:12.927: E/AndroidRuntime(589): at org.json.JSONObject.<init>(JSONObject.java:154)
10-06 19:23:12.927: E/AndroidRuntime(589): at org.json.JSONObject.<init>(JSONObject.java:171)
10-06 19:23:12.927: E/AndroidRuntime(589): at com.fansheroid.facts.chicks.MainActivity.getTumblrs(MainActivity.java:156)
10-06 19:23:12.927: E/AndroidRuntime(589): at com.fansheroid.facts.chicks.MainActivity.onCreate(MainActivity.java:62)
10-06 19:23:12.927: E/AndroidRuntime(589): at android.app.Activity.performCreate(Activity.java:4465)
10-06 19:23:12.927: E/AndroidRuntime(589): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1049)
10-06 19:23:12.927: E/AndroidRuntime(589): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1919)
10-06 19:23:12.927: E/AndroidRuntime(589): ... 11 more
我一直在試圖找出問題在過去兩天,但它只是不給我任何意義。
編輯添加的代碼
public ArrayList<Tumblr> getTumblrs() throws ClientProtocolException,
IOException, JSONException {
String searchUrl = "http://api.tumblr.com/v2/blog/factsandchicks.com/posts?api_key=API_KEY";
ArrayList<Tumblr> tumblrs = new ArrayList<Tumblr>();
HttpClient client = new DefaultHttpClient();
HttpGet get = new HttpGet(searchUrl);
ResponseHandler<String> responseHandler = new BasicResponseHandler();
String responseBody = null;
try {
responseBody = client.execute(get, responseHandler);
} catch (Exception ex) {
ex.printStackTrace();
}
JSONObject jsonObject = new JSONObject(responseBody);
JSONArray posts = jsonObject.getJSONObject("response").getJSONArray(
"posts");
for (int i = 0; i < posts.length(); i++) {
JSONArray photos = posts.getJSONObject(i).getJSONArray("photos");
for (int j = 0; j < photos.length(); j++) {
JSONObject photo = photos.getJSONObject(j);
String url = photo.getJSONArray("alt_sizes").getJSONObject(0)
.getString("url");
Tumblr tumblr = new Tumblr(url);
tumblrs.add(tumblr);
}
}
return tumblrs;
}
行156:
JSONObject jsonObject = new JSONObject(responseBody);
請顯示MainActivity.java的第156行,以及周圍的方法以及與此相關的任何方法。 (請註明156。) – Eric
可能有一些關於'ResponseHandler'類不適用於較新的API的問題。嘗試使用'HttpResponse'和'HttpEntity'類來獲取主體。 – tolgap
它已經在問題中了。 – Fansher