问题
actually I've read some previous questions about this...
this is the code that I use
auto = (ListView)findViewById(R.id.auto);
String[] projection = new String[] {Browser.BookmarkColumns._ID,Browser.BookmarkColumns.TITLE,Browser.BookmarkColumns.URL};
String[] displayFields = new String[] {Browser.BookmarkColumns.TITLE, Browser.BookmarkColumns.URL};
int[] displayViews = new int[] { R.id.text1,R.id.text2 };
Cursor cur = managedQuery(android.provider.Browser.BOOKMARKS_URI,projection, null, null, null);
//auto.setAdapter(new SimpleCursorAdapter(this, R.layout.mylist, cur,displayFields, displayViews));
myAdapter apt = new myAdapter(this, R.layout.mylist, cur,displayFields, displayViews);
auto.setAdapter(apt);
and class myAdapter
class myAdapter extends SimpleCursorAdapter{
private Cursor c;
private Context context;
public myAdapter(Context context, int layout, Cursor c, String[] from,
int[] to) {
super(context, layout, c, from, to);
// TODO Auto-generated constructor stub
this.c = c;
this.context = context;
AutoList att = new AutoList();
mListView = att.auto;
}
@Override
public View getView(int pos, View inView, ViewGroup parent) {
View vix = inView;
if (vix == null) {
LayoutInflater inflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
vix = inflater.inflate(R.layout.mylist, null);
}
this.c.moveToPosition(pos);
String title = this.c.getString(this.c.getColumnIndex(Browser.BookmarkColumns.TITLE));
String cont = this.c.getString(this.c.getColumnIndex(Browser.BookmarkColumns.URL));
TextView text1 = (TextView) vix.findViewById(R.id.text1);
text1.setText(title);
TextView text2 = (TextView) vix.findViewById(R.id.text2);
text2.setText(cont);
Button butt = (Button) vix.findViewById(R.id.button);
butt.setOnClickListener(mButt);
return vix;
}
private OnClickListener mButt = new OnClickListener() {
@Override
public void onClick(View v) {
final int position = mListView.getPositionForView((View) v.getParent());
Log.v("BUTT", "Title clicked, row "+position);
}
};
However, when I click the button, I still get a lot of errors like this:
04-10 22:30:55.152: ERROR/AndroidRuntime(695): FATAL EXCEPTION: main
04-10 22:30:55.152: ERROR/AndroidRuntime(695): java.lang.NullPointerException
04-10 22:30:55.152: ERROR/AndroidRuntime(695): at com.auto2.AutoList$myAdapter$1.onClick(AutoList.java:113)
04-10 22:30:55.152: ERROR/AndroidRuntime(695): at android.view.View.performClick(View.java:2408)
04-10 22:30:55.152: ERROR/AndroidRuntime(695): at android.view.View$PerformClick.run(View.java:8816)
04-10 22:30:55.152: ERROR/AndroidRuntime(695): at android.os.Handler.handleCallback(Handler.java:587)
04-10 22:30:55.152: ERROR/AndroidRuntime(695): at android.os.Handler.dispatchMessage(Handler.java:92)
04-10 22:30:55.152: ERROR/AndroidRuntime(695): at android.os.Looper.loop(Looper.java:123)
04-10 22:30:55.152: ERROR/AndroidRuntime(695): at android.app.ActivityThread.main(ActivityThread.java:4627)
04-10 22:30:55.152: ERROR/AndroidRuntime(695): at java.lang.reflect.Method.invokeNative(Native Method)
04-10 22:30:55.152: ERROR/AndroidRuntime(695): at java.lang.reflect.Method.invoke(Method.java:521)
04-10 22:30:55.152: ERROR/AndroidRuntime(695): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868)
04-10 22:30:55.152: ERROR/AndroidRuntime(695): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626)
04-10 22:30:55.152: ERROR/AndroidRuntime(695): at dalvik.system.NativeStart.main(Native Method)
That's it! I hope it won't be so difficult to be figured out!
Thanks!
回答1:
Actually, I used the same approach - just added casting the parent layout and I got the position w/o any exception
public void deleteButtonClick(View v) {
//TODO Remove favorite - DB + file system
Toast.makeText(this, "Deleting bookmark", Toast.LENGTH_SHORT).show();
final int position = getListView().getPositionForView((LinearLayout)v.getParent());
if (position >= 0) {
Favorite o = (Favorite) this.getListAdapter().getItem(position);
}
}
My layout for listview row :
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res/com.bbox.application"
android:orientation="vertical" android:layout_width="fill_parent"
android:layout_height="fill_parent">
<com.markupartist.android.widget.ActionBar
android:id="@+id/actionbar" app:title="@string/ac_title" style="@style/ActionBar" />
<ListView android:id="@+id/android:list" android:layout_width="fill_parent"
android:layout_height="wrap_content" android:layout_weight="5"
android:background="@drawable/categrory_bckgr" />
<TextView android:id="@+id/android:empty"
android:layout_width="fill_parent" android:layout_height="wrap_content"
android:text="@string/main_no_items" />
</LinearLayout>
I hope it'll help.
回答2:
An easier solution to this probably is when your Activity implements OnClickListener and you set the (casted) Context as OnClickListener to any view you want in the Adapter. For more robust code you can check with instanceof.
public class MyActivity implements OnClickListener {
// ...
}
public class MyAdapter extends CursorAdapter {
@Override
public void bindView(View view, Context context, Cursor cursor) {
final TextView tv = (View) view.findViewById(R.id.text1);
setOnClickListener((OnClickListener)context);
tv.setTag(cursor.getPosition());
}
}
For convenience you can set the items position in the adapter as Tag of the view. That way you can easily lookup the whole item in the adapter.
回答3:
We can get the position by implementing onClickListener inside the getView method of adapter.
ADAPTER :
public class DetailsListAdapter extends BaseAdapter {
Context context;
ArrayList<Profile> data;
public DetailsListAdapter(Context context, ArrayList<Profile> data) {
this.context = context;
this.data = data;
}
@Override
public int getCount() {
return data.size();
}
@Override
public Object getItem(int position) {
return data.get(position);
}
@Override
public long getItemId(int position) {
return position;
}
@Override
public View getView(final int position, View convertView, ViewGroup parent) {
ViewHolder viewHolder;
if (convertView == null) {
convertView = LayoutInflater.from(context).inflate(R.layout.list_item_logs_details, null);
viewHolder = new ViewHolder();
viewHolder.btn = (Button) convertView.findViewById(R.id.log_details_1_a);
viewHolder.btn.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Log.d("statusPosition","position "+position);
}
});
convertView.setTag(viewHolder);
} else {
viewHolder = (ViewHolder) convertView.getTag();
}
return convertView;
}
public static class ViewHolder {
TextView tv2, tv3, tv3a, tv4, tv4a;
Button btn;
}
}
回答4:
ListView with Clickable Buttons!!!
Well...., here's the rough method to solve my problem SO FAR....
item.xml:
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:orientation="horizontal"
android:layout_height="wrap_content">
<TextView android:id="@+id/showTv"
android:layout_alignParentLeft="true"
android:gravity="center_vertical"
android:textSize="24dip"
android:layout_height="wrap_content"
android:layout_width="wrap_content" />
<RelativeLayout android:id="@+id/jjjj"
android:layout_alignParentRight="true"
android:layout_height="wrap_content"
android:layout_width="wrap_content">
<Button android:id="@+id/gointoBt"
android:focusable="false"
android:layout_alignParentRight="true"
android:text="abc"
android:layout_height="wrap_content"
android:layout_width="wrap_content"/>
<Button android:id="@+id/chooseBt"
android:layout_toLeftOf="@id/gointoBt"
android:layout_marginRight="10dip"
android:text="text"
android:focusable="false"
android:layout_height="wrap_content"
android:layout_width="wrap_content"/>
</RelativeLayout>
MySimpleAdapter：
import ........;
public class MySimpleAdapter extends SimpleAdapter {
private final Context context;
private List<Map<String, Object>> data;
private int resource;
private String[] from;
private int[] to;
public MySimpleAdapter(Context context,List<? extends Map<String, ?>> data, int resource, String[] from,
int[] to) {
super(context, data, resource, from, to);
this.context=context;
this.data=(List<Map<String, Object>>) data;
this.resource=resource;
this.from=from;
this.to=to;
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
LayoutInflater inflater = ((Activity)context).getLayoutInflater();
View rowView = inflater.inflate(resource, null, true);
Map<String, Object> medMap=data.get(position);
final TextView[] showTv=new TextView[from.length];
for (int i = 0; i < from.length; i++) {
showTv[i]=(TextView)rowView.findViewById(to[i]);
showTv[i].setText(""+medMap.get(from[i]));
}
Button btn=(Button)rowView.findViewById(R.id.gointoBt);
Button.OnClickListener mOkOnClickListener = new Button.OnClickListener()
{
public void onClick(View v) {
Log.v("ttttttt", ""+showTv[0].getText());
Toast.makeText(context,""+showTv[0].getText(), Toast.LENGTH_LONG).show();
}
};
btn.setOnClickListener(mOkOnClickListener);
Button btn2=(Button)rowView.findViewById(R.id.chooseBt);
Button.OnClickListener mOkOnClickListener2 = new Button.OnClickListener()
{
public void onClick(View v) {
Log.v("hhhhhhh", ""+showTv[0].getText());
Toast.makeText(context,"abc"+showTv[0].getText(), Toast.LENGTH_LONG).show();
}
};
btn2.setOnClickListener(mOkOnClickListener2);
return rowView;
}
}
Activty：
import .......;
public class ActivityMain extends Activity {
ListView listview;
List<Map<String,Object>> data;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setTitle("My work");
prepareData();
listview =new ListView(this);
MySimpleAdapter adapter=new MySimpleAdapter(this,data,R.layout.item,new String[] {"uu"},new int[]{R.id.showTv});
listview.setAdapter(adapter);
setContentView(listview);
}
private void prepareData(){
data=new ArrayList<Map<String,Object>>();
Map<String,Object> item;
item=new HashMap<String,Object>();
item.put("uu", "hello");
data.add(item);
item=new HashMap<String,Object>();
item.put("uu", "myyou");
data.add(item);
item=new HashMap<String,Object>();
item.put("uu", "piero");
data.add(item);
}
}
Thanks for that Man that is so kind to provide this AWESOME yet Mightiest tutorial.... which anyone here couldn't give to the noobs....
回答5:
I think one more best approach is there.You can add one tag as position with the button using (button.setTag()) method and whenever user will click button just take the tag of this button. it will more easy.
Thanks and Regards Rahul
回答6:
Very Simple. In your Adapter class getView method change int position to final int position.
public View getView(final int position, View convertView, ViewGroup parent) {
LayoutInflater inflater = (LayoutInflater) context
.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
View row = inflater.inflate(yourcustomizeditemview.xml, parent,
false);
Button btn= (Button) row.findViewById(R.id.btn);
btn.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
Toast.makeText(context, " "+position, Toast.LENGTH_SHORT).show();
}
});
return row;
}
now on Button click Toast shows the position of item in which Button is present.
回答7:
It seems in onClick() that mListView is null. It's possible that
auto = (ListView)findViewById(R.id.auto);
returned null, because a view of R.id.auto couldn't be found in the present layout. I'd put a debugger breakpoint just after that line and see.
回答8:
do you execute this
btnNxt = (Button) findViewById(R.id.btnNext);
btnNxt.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View arg0) {
//Here I need to get that position
});
inside the getView method? if so it's very easy
btnNxt = (Button) findViewById(R.id.btnNext);
btnNxt.setTag(position);
btnNxt.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View arg0) {
int position=(Integer)arg0.getTag();
});
from this: https://stackoverflow.com/a/20542034
来源：https://stackoverflow.com/questions/5612844/how-to-get-a-list-item-position-by-clicking-the-button-inside-it