標籤:E/AndroidRuntime﹕ FATAL EXCEPTION: mainProcess: org.example.magnusluca.drawertestapp, PID: 3624java.lang.NullPointerException: Attempt to write to field ‘android.support.v4.app.FragmentManagerImpl android.support.v4.app.Fragment.mFragmentManager‘
標籤: 轉載請標註原創地址:http://blog.csdn.net/lsyz0021/article/details/52162414 眾所周知android studio會在library所依賴的app運行或者build之後自動產生jar,路徑為build/intermediates/bundles/debug or
標籤:android開發之背景音樂與音效一:添加背景音樂(MediaPlayer)MediaPlayer class can be used to control playback of audio/video files and streams.MediaPlayer 類是用來控制音頻和視頻檔案的播放;執行個體化MediaPlayer的方法:直接new的方式:MediaPlayer mp = new MediaPlayer();使用create的方式,如:MediaPlayer mp =
標籤:使用OC自訂了一個IntPair類作為NSDictionary類的索引值,與JAVA中的Pair<int,int>使用方式類似,然而在使用過程中遇到了各種問題,有必要記錄一下。首先,需要實現NSCoping協議,如果不實現的話,在使用IntPair作為key向dictionary中添加資料時會警示告:Sending ‘IntPair *__strong to parameter of incompatible type ‘id<NSCopying>
標籤:非公有的變數前面要加上小寫m,靜態變數前面加上小寫s,其它變數以小寫字母開頭,靜態變數全大寫例子public class MyClass { public static final int SOME_CONSTANT = 42; public int publicField; private static MyClass sSingleton; int mPackagePrivate; private int mPrivate;
標籤:Given an Android 3x3 key lock screen and two integers m and n, where 1 ≤ m ≤ n ≤ 9, count the total number of unlock patterns of the Android lock screen, which consist of minimum of m keys and maximum n keys.Rules for a valid
標籤:寫法1:- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender { // Get the new view controller using [segue destinationViewController]. // Pass the selected object to the new view controller. if ([segue.identifier