如何通过单击其中的按钮获取列表项位置？

Question

实际上我已经读过一些关于此的问题......

这是我使用的代码

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);

和类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);
        }
    };

但是,当我点击按钮时,我仍然会收到很多这样的错误:

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)

而已!我希望不会被弄清楚这么难!

谢谢!

Answer 1

实际上,我使用了相同的方法 - 只是添加了转换父布局,我得到了没有任何异常的位置

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);
        }
}

我对listview行的布局:

<?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>

我希望它会有所帮助.

Answer 2

带有可点击按钮的ListView！！！

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嗯......，这是到目前为止解决我的问题的粗略方法......

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项目.xml：

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<?xml version="1.0" encoding="utf-8"?>\n<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"\n            android:layout_width="fill_parent"\n            android:orientation="horizontal"\n            android:layout_height="wrap_content">\n<TextView android:id="@+id/showTv"\n      android:layout_alignParentLeft="true"\n      android:gravity="center_vertical"\n      android:textSize="24dip"\n      android:layout_height="wrap_content"\n      android:layout_width="wrap_content" /> \n <RelativeLayout android:id="@+id/jjjj"\n                 android:layout_alignParentRight="true"\n                 android:layout_height="wrap_content"\n                 android:layout_width="wrap_content">        \n      <Button android:id="@+id/gointoBt"\n               android:focusable="false"\n               android:layout_alignParentRight="true"\n               android:text="abc"\n               android:layout_height="wrap_content"\n               android:layout_width="wrap_content"/> \n      <Button android:id="@+id/chooseBt"\n              android:layout_toLeftOf="@id/gointoBt"\n              android:layout_marginRight="10dip"\n              android:text="text"\n              android:focusable="false"\n              android:layout_height="wrap_content"\n              android:layout_width="wrap_content"/>\n  </RelativeLayout> \n

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MySimpleAdapter\xef\xbc\x9a

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import ........;\n\npublic class MySimpleAdapter extends SimpleAdapter {\n\nprivate final Context context;\nprivate List<Map<String, Object>> data;\nprivate int resource;\nprivate String[] from;\nprivate int[] to;\n\npublic MySimpleAdapter(Context context,List<? extends Map<String, ?>> data, int resource, String[] from,\nint[] to) {\n   super(context, data, resource, from, to);\n   this.context=context;\n   this.data=(List<Map<String, Object>>) data;\n   this.resource=resource;\n   this.from=from;\n   this.to=to;\n}\n\n@Override\npublic View getView(int position, View convertView, ViewGroup parent) {\n\n   LayoutInflater inflater = ((Activity)context).getLayoutInflater();\n   View rowView = inflater.inflate(resource, null, true); \n   Map<String, Object> medMap=data.get(position);\n   final TextView[] showTv=new TextView[from.length]; \n\n   for (int i = 0; i < from.length; i++) { \n    showTv[i]=(TextView)rowView.findViewById(to[i]);\n    showTv[i].setText(""+medMap.get(from[i]));\n   }\nButton btn=(Button)rowView.findViewById(R.id.gointoBt);\n   Button.OnClickListener mOkOnClickListener = new Button.OnClickListener()\n      {\n         public void onClick(View v) {\n         Log.v("ttttttt", ""+showTv[0].getText());\n         Toast.makeText(context,""+showTv[0].getText(), Toast.LENGTH_LONG).show();\n         }\n     };\n btn.setOnClickListener(mOkOnClickListener); \n\n     Button btn2=(Button)rowView.findViewById(R.id.chooseBt);\n   Button.OnClickListener mOkOnClickListener2 = new Button.OnClickListener()\n      {\n          public void onClick(View v) {\n          Log.v("hhhhhhh", ""+showTv[0].getText());\n          Toast.makeText(context,"abc"+showTv[0].getText(), Toast.LENGTH_LONG).show();\n          }\n      };\n   btn2.setOnClickListener(mOkOnClickListener2);     \n   return rowView; \n}\n}\n

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活动\xef\xbc\x9a

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import .......;\n\npublic class   ActivityMain extends Activity {\n\nListView listview;\nList<Map<String,Object>> data;\n@Override\nprotected void onCreate(Bundle savedInstanceState) {\n   super.onCreate(savedInstanceState);\n   setTitle("My work");\n   prepareData(); \n   listview =new ListView(this);\n   MySimpleAdapter adapter=new MySimpleAdapter(this,data,R.layout.item,new String[]      {"uu"},new int[]{R.id.showTv});\n\n   listview.setAdapter(adapter);                            \n     setContentView(listview);\n\n}\nprivate void prepareData(){\n   data=new ArrayList<Map<String,Object>>();\n   Map<String,Object> item;\n   item=new HashMap<String,Object>();\n   item.put("uu", "hello");\n   data.add(item);\n   item=new HashMap<String,Object>();\n   item.put("uu", "myyou");\n   data.add(item);\n   item=new HashMap<String,Object>();\n   item.put("uu", "piero");\n   data.add(item);\n}\n\n}\n

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感谢那个人如此友善地提供了这个很棒但最强大的教程......\n这里的任何人都无法将其提供给菜鸟......

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