问题
have searched listview OnClick not working pages, doesn't solve.
my Activity populates listview by calling a custom adapter MyArrayAddapter which extends ArrayAdapter class.
The problem: onItemClick() or setOnItemClick() ain't responding.
when i click on any of the items no action takes place, not even log statements get executed.
<<>>
code snippet:
Under my class which extends Activity implements OnItemClickListener, I initialize and call following functions in OnCreate() method:
private void listViewSet() {
MyArrayAdapter adapter = new MyArrayAdapter( this, R.id.tvrow, rootListWrapper );
// Assign adapter to ListView
listView.setAdapter( adapter );
listView.setOnItemClickListener( this ); //******
listView.performClick();
}
Even toast doesnt show up :(
@Override
public void onItemClick(AdapterView<?> parent, View v, int position, long id) {
Log.v( "OnCLick", "asdfhjdf" );
Toast.makeText( this, "Component "+ rootListWrapper.get( position ).toString() + " clicked.", Toast.LENGTH_LONG ).show();
root = rootListWrapper.get( position );
rootListWrapper = root.children;
this.listViewSet();
}
Note: when i click on an item of the listview, i get exactly same messages only differing in timestamp. I get 7-8 such new messages. LogCat before click:
03-15 09:54:06.507: W/Trace(1825): Unexpected value from nativeGetEnabledTags: 0
03-15 09:54:06.877: W/Trace(1825): Unexpected value from nativeGetEnabledTags: 0
03-15 09:54:06.877: W/Trace(1825): Unexpected value from nativeGetEnabledTags: 0
03-15 09:54:06.947: W/Trace(1825): Unexpected value from nativeGetEnabledTags: 0
03-15 09:54:06.947: W/Trace(1825): Unexpected value from nativeGetEnabledTags: 0
03-15 09:54:07.117: W/Trace(1825): Unexpected value from nativeGetEnabledTags: 0
03-15 09:54:07.117: W/Trace(1825): Unexpected value from nativeGetEnabledTags: 0
03-15 09:54:07.297: W/Trace(1825): Unexpected value from nativeGetEnabledTags: 0
after click:
03-15 10:05:36.458: W/Trace(1825): Unexpected value from nativeGetEnabledTags: 0
03-15 10:05:36.458: W/Trace(1825): Unexpected value from nativeGetEnabledTags: 0
03-15 10:05:36.480: W/Trace(1825): Unexpected value from nativeGetEnabledTags: 0
03-15 10:05:40.817: W/Trace(1825): Unexpected value from nativeGetEnabledTags: 0
03-15 10:05:40.817: W/Trace(1825): Unexpected value from nativeGetEnabledTags: 0
03-15 10:05:40.917: W/Trace(1825): Unexpected value from nativeGetEnabledTags: 0
03-15 10:05:40.960: W/Trace(1825): Unexpected value from nativeGetEnabledTags: 0
The layout for the activity:
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".BigClass" >
<ListView
android:id="@+id/mylist"
android:layout_width="match_parent"
android:layout_height="wrap_content" >
</ListView>
</RelativeLayout>
layout for row items:
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:padding="20dp"
>
<TextView android:id="@+id/tvrow"
android:layout_width="fill_parent"
android:layout_height="wrap_content" android:text="Component" />
<LinearLayout android:weightSum="9" android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_below="@id/tvrow" >
<Button android:id="@+id/bL"
android:layout_weight="4"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:background="@drawable/blue_right"
/>
<Button
android:id="@+id/bC
android:layout_weight="1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:background="@drawable/component2"
/>
<Button
android:layout_weight="4"
android:id="@+id/bR"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:background="@drawable/blue_right"
/>
</LinearLayout>
</RelativeLayout>
It populates perfectly for first time, but I want when I click i should be able to repopulate it by changing the parameters and calling the setAdapter() method again.
Solving this will surely help out many others, as i see many have unsolved doubts.
java file for class in question:
public class BigClass extends Activity implements OnItemClickListener{
List<Node> rootListWrapper;
Node root;
ListView listView;
GetMethodEx getJSONString;
JSONObject jObject;
BigClass HealthNext;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_health_display);
listView = (ListView) findViewById(R.id.mylist);
rootListWrapper = new ArrayList<Node>();
root = new Node();
getJSONString = new GetMethodEx();
jObject = new JSONObject();
//values = new String[] { "Android", "iPhone", "WindowsMobile",
// "Blackberry", "WebOS", "Ubuntu", "Windows7", "Max OS X",
// "Linux", "OS/2" };
this.jsonDataFetch();
this.listViewSet();
}
private void jsonDataFetch() {
// TODO Auto-generated method stub
try{
jObject=new JSONObject( getJSONString.getInternetData() );
root = root.createNode( jObject );
Log.v( "component", jObject.getString("status") );
rootListWrapper.add( root );
}catch(Exception e){
e.printStackTrace();
}
Log.v("component", rootListWrapper.toString());
}
private void listViewSet() {
// Define a new Adapter
// First parameter - Context
// Second parameter - Layout for the row
// Third parameter - ID of the TextView to which the data is written
// Fourth - the Array of data
MyArrayAdapter adapter = new MyArrayAdapter( this, R.id.tvrow, rootListWrapper );
// Assign adapter to ListView
listView.setAdapter( adapter );
listView.setOnItemClickListener( this );
listView.performClick();
}
@Override
public void onItemClick(AdapterView<?> parent, View v, int position, long id) {
Log.v( "OnCLick", "asdfhjdf" );
Toast.makeText( BigClass.this, "Component "+ rootListWrapper.get( position ).toString() + " clicked.", Toast.LENGTH_LONG ).show();
root = rootListWrapper.get( position );
rootListWrapper = root.children;
HealthNext.jsonDataFetch();
HealthNext.listViewSet();
}
}
LOGCAT updated: after using focusable:false attribute on 3 buttons.
03-15 10:57:44.798: V/OnCLick(958): asdfhjdf
03-15 10:57:44.952: D/AndroidRuntime(958): Shutting down VM
03-15 10:57:44.952: W/dalvikvm(958): threadid=1: thread exiting with uncaught exception (group=0x40a70930)
03-15 10:57:44.992: E/AndroidRuntime(958): FATAL EXCEPTION: main
03-15 10:57:44.992: E/AndroidRuntime(958): java.lang.NullPointerException
03-15 10:57:44.992: E/AndroidRuntime(958): at com.example.@@@@@@.BigClass.onItemClick(BigClass.java:86)
03-15 10:57:44.992: E/AndroidRuntime(958): at android.widget.AdapterView.performItemClick(AdapterView.java:298)
03-15 10:57:44.992: E/AndroidRuntime(958): at android.widget.AbsListView.performItemClick(AbsListView.java:1100)
03-15 10:57:44.992: E/AndroidRuntime(958): at android.widget.AbsListView$PerformClick.run(AbsListView.java:2749)
03-15 10:57:44.992: E/AndroidRuntime(958): at android.widget.AbsListView$1.run(AbsListView.java:3423)
03-15 10:57:44.992: E/AndroidRuntime(958): at android.os.Handler.handleCallback(Handler.java:725)
03-15 10:57:44.992: E/AndroidRuntime(958): at android.os.Handler.dispatchMessage(Handler.java:92)
03-15 10:57:44.992: E/AndroidRuntime(958): at android.os.Looper.loop(Looper.java:137)
03-15 10:57:44.992: E/AndroidRuntime(958): at android.app.ActivityThread.main(ActivityThread.java:5039)
03-15 10:57:44.992: E/AndroidRuntime(958): at java.lang.reflect.Method.invokeNative(Native Method)
03-15 10:57:44.992: E/AndroidRuntime(958): at java.lang.reflect.Method.invoke(Method.java:511)
03-15 10:57:44.992: E/AndroidRuntime(958): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793)
03-15 10:57:44.992: E/AndroidRuntime(958): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560)
03-15 10:57:44.992: E/AndroidRuntime(958): at dalvik.system.NativeStart.main(Native Method)
回答1:
Edit:
Replace your row xml file with this
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:descendantFocusability="true"
android:padding="20dp"
>
<TextView android:id="@+id/tvrow"
android:layout_width="fill_parent"
android:layout_height="wrap_content" android:text="Component" />
<LinearLayout android:weightSum="9" android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_below="@id/tvrow" >
<Button android:id="@+id/bL"
android:layout_weight="4"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:focusable="false"
android:background="@drawable/blue_right"
/>
<Button
android:id="@+id/bC"
android:layout_weight="1"
android:focusable="false"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:background="@drawable/component2"
/>
<Button
android:layout_weight="4"
android:id="@+id/bR"
android:focusable="false"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:background="@drawable/blue_right"
/>
</LinearLayout>
</RelativeLayout>
Your custom adapter may have a focusable items like (EditText, Button) etc, try to set focus of row items to false
回答2:
listView.performClick();
Would trigger onClick() on the listview and not on individual items in the list.
So, you should also have to implement the onClick() method to intercept clicks on your listview.
来源：https://stackoverflow.com/questions/15429752/onitemclick-not-responding-to-clicks