android-listview

问题 I created a simple Android ListView with an ArrayAdapter as shown below ListView lView; ArrayList<String> listItems; protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); lView = findViewById(R.id.mainListView); listItems = new ArrayList<>(); updateView(42); lView.setOnItemClickListener(new OnItemClickListener(){ @Override public void onItemClick(AdapterView<?> p1, View p2, int p3, long p4) { View v = lView.getChildAt(p3 -

问题 I created a simple Android ListView with an ArrayAdapter as shown below ListView lView; ArrayList<String> listItems; protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); lView = findViewById(R.id.mainListView); listItems = new ArrayList<>(); updateView(42); lView.setOnItemClickListener(new OnItemClickListener(){ @Override public void onItemClick(AdapterView<?> p1, View p2, int p3, long p4) { View v = lView.getChildAt(p3 -

问题 I am trying to use Python term to explain why the following happens, can somebody explain why tmp becomes to [[1,2,3]] not stay as [[1,2]] ? arr = [] tmp = [1,2] arr.append(tmp) print arr # [[1,2]] tmp.append(3) print arr # [[1,2,3]] 回答1: arr = [] is an empty list, and when you append tmp to it via: tmp = [1, 2] arr.append(tmp) You are putting tmp in the arr list, thus giving you arr = [tmp] which can be expanded to arr = [[1,2]] . But the neat thing here is that you maintain a reference to

问题 I am trying to use Python term to explain why the following happens, can somebody explain why tmp becomes to [[1,2,3]] not stay as [[1,2]] ? arr = [] tmp = [1,2] arr.append(tmp) print arr # [[1,2]] tmp.append(3) print arr # [[1,2,3]] 回答1: arr = [] is an empty list, and when you append tmp to it via: tmp = [1, 2] arr.append(tmp) You are putting tmp in the arr list, thus giving you arr = [tmp] which can be expanded to arr = [[1,2]] . But the neat thing here is that you maintain a reference to

来源： https://stackoverflow.com/questions/63830625/android-how-to-join-the-child-table-with-parent-table-sqlite

来源： https://stackoverflow.com/questions/7514844/adding-header-in-listview-in-android

问题 I'm just starting out in Android development and need to create an expandable list view. I'm following this tutorial: http://www.androidhive.info/2013/07/android-expandable-list-view-tutorial/ The application compiles and runs successfully, however I'm getting the following error: java.lang.IllegalStateException: ArrayAdapter requires the resource ID to be a TextView I have found similar issues on the website, as well as read the Array Adapter documentation, and it seems that I should either:

问题 I'm just starting out in Android development and need to create an expandable list view. I'm following this tutorial: http://www.androidhive.info/2013/07/android-expandable-list-view-tutorial/ The application compiles and runs successfully, however I'm getting the following error: java.lang.IllegalStateException: ArrayAdapter requires the resource ID to be a TextView I have found similar issues on the website, as well as read the Array Adapter documentation, and it seems that I should either:

问题 I'm just starting out in Android development and need to create an expandable list view. I'm following this tutorial: http://www.androidhive.info/2013/07/android-expandable-list-view-tutorial/ The application compiles and runs successfully, however I'm getting the following error: java.lang.IllegalStateException: ArrayAdapter requires the resource ID to be a TextView I have found similar issues on the website, as well as read the Array Adapter documentation, and it seems that I should either:

问题 I m trying to read the contacts in a list with multiple checkboxes , but when i call the sparsebooleanarray ..it just return false for all the list entries,..even for the one s checked ...I looked into this thread Why is ListView.getCheckedItemPositions() not returning correct values? ...But when i implement the addClickHandlerToCheckBox it force stops..this has been bugging me for 4 days..please any help.. public void populateContactList() { // Build adapter with contact entries final Cursor