android-context

问题 I'm developing an app with React Native for both iOS and Android, and I am trying to prevent device-specific scaling of the display in the app. For text/font size scaling, putting the following code in the root-level App.js file solves the issue for both iOS and Android: if (Text.defaultProps == null) { Text.defaultProps = {}; } Text.defaultProps.allowFontScaling = false; However, Android devices have the following Display size setting that is still being applied: I've tried (unsuccessfully)

问题 I started using a ContextThemeWrapper to apply a style dynamically to an ImageButton ; based an answer to another question of mine, and answers to other similar questions. ContextThemeWrapper wrapper = new ContextThemeWrapper(getContext(), mStyleRes); mImageButton = new AppCompatImageButton(wrapper, null, 0); But recently a lint error started appearing on the ContextThemeWrapper constructor stating: ContextThemeWrapper can only be called from within the same library group (groupId=com.android

问题 I started using a ContextThemeWrapper to apply a style dynamically to an ImageButton ; based an answer to another question of mine, and answers to other similar questions. ContextThemeWrapper wrapper = new ContextThemeWrapper(getContext(), mStyleRes); mImageButton = new AppCompatImageButton(wrapper, null, 0); But recently a lint error started appearing on the ContextThemeWrapper constructor stating: ContextThemeWrapper can only be called from within the same library group (groupId=com.android

问题 I started using a ContextThemeWrapper to apply a style dynamically to an ImageButton ; based an answer to another question of mine, and answers to other similar questions. ContextThemeWrapper wrapper = new ContextThemeWrapper(getContext(), mStyleRes); mImageButton = new AppCompatImageButton(wrapper, null, 0); But recently a lint error started appearing on the ContextThemeWrapper constructor stating: ContextThemeWrapper can only be called from within the same library group (groupId=com.android

问题 I am trying to implement MVVM pattern in my android app. I have read that ViewModels should contain no android specific code (to make testing easier), however I need to use context for various things (getting resources from xml, initializing preferences, etc). What is the best way to do this? I saw that AndroidViewModel has a reference to the application context, however that contains android specific code so I'm not sure if that should be in the ViewModel. Also those tie into the Activity

问题 I am confused about why do we use attachBaseContext in android. It would be a great help if someone could explain to me the meaning for the same. 回答1: The attachBaseContext function of the ContextWrapper class is making sure the context is attached only once. ContextThemeWrapper applies theme from application or Activity which is defined as android:theme in the AndroidManifest.xml file. Since both Application and Service do not need theme, they inherit it directly from ContextWrapper . During

问题 I'm working on an Android application that has several Activities. In it I have a class with several static methods. I would like to be able to call these methods from the different Activities. I'm using the static methods to load data from an xml file via a XmlResourceParser. To create a XmlResourceParser requires a call on the Application Context. So my question is, what is the best way to get a reference to the Application Context into the static methods? Have each Activity get it and pass

问题 I am creating an Android app and I am trying to use a SettingsManager class to read and write preferences. To use this, I have to pass context to this SettingsManager in order to use the SharedPreferences API. However, my code keeps giving me a NullPointerException . Can anyone tell me why? Main.java @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_status); mNavigationDrawerFragment = (NavigationDrawerFragment)

问题 In the code below, the getPieceTextFile() method takes an Activity context parameter, however when used, the context passed in appears to be null and leads to a NPE. Any suggestions why would be greatly appreciated. The LogCat output and code listing are shown below. LogCat 01-03 13:48:47.223: I/dalvikvm(571): threadid=3: reacting to signal 3 01-03 13:48:47.233: I/dalvikvm(571): Wrote stack traces to '/data/anr/traces.txt' 01-03 13:49:30.073: I/System.out(571): Asset Manager/IS not work. 01

问题 What's the best way to call a method inside a fragment from a different class? I passed the context via getActivity() into the class. Something along the lines of ((Fragment) ((Activity) context).getMainFragment()).Method(); This just doesn't look right.... 回答1: I think you can do something like this: Create interface OnMyDialogClickListener and class MyDialogFragment , which will call methods of created interface public class MyDialogFragment extends DialogFragment { private