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我在一个安卓应用程序中使用了一个列表视图。每行列表视图由两个文本视图组成，一个文本视图（命名text1）用于显示数据库中的一个单词，另一个文本视图（命名text2）用于显示数据库中该词的含义。列表视图的显示效果很好。每当我单击列表视图的行（项目）时，我想从列表视图中显示单词和含义。但是这个动作效果不好，它正在“强制关闭”。我使用了这段代码：

@Override
        public void afterTextChanged(Editable s) {

            mDbHelper.open();

            String ss=s.toString();// get the word from the edittext 

             ArrayList<HashMap<String, String>> list_of_wordmeanings = new ArrayList<HashMap<String, String>>();

            Cursor mCursor = mDbHelper.getTestData(ss);// get the rows from the database matched with EditText data

            for (int i = 0; i < mCursor.getCount(); i++) 
            {
                mCursor.moveToPosition(i);


                HashMap<String, String> hm = new HashMap<String, String>();

                    String word = mCursor.getString(0).toString();
                    String meaning = mCursor.getString(1).toString();

                      hm.put("key_word",word);
                      hm.put("key_meaning",meaning);

                      list_of_wordmeanings.add(hm);
            }

                    String[] from = { "key_word","key_meaning" };
                    int[] to = { R.id.txt1,R.id.txt2};
                    SimpleAdapter adapter = new SimpleAdapter(getBaseContext(), list_of_wordmeanings, R.layout.list_layout, from, to);

                    listView.setAdapter(adapter);
            } // end of afterTextChanged

        listView.setOnItemClickListener(new OnItemClickListener() {

                          @Override
                          public void onItemClick(AdapterView<?> parent, View view,
                             int position, long id) {

                              Cursor cursor = (Cursor) listView.getItemAtPosition(position);


                               String english_word =
                                cursor.getString(0);
                               String word_meaning =
                                        cursor.getString(1);

                               Toast.makeText(getApplicationContext(),english_word+word_meaning, Toast.LENGTH_SHORT).show();
  }

我的 LogCat 显示这些：

08-05 10:34:13.470: W/KeyCharacterMap(15079): No keyboard for id 0
08-05 10:34:13.470: W/KeyCharacterMap(15079): Using default keymap: /system/usr/keychars/qwerty.kcm.bin
08-05 10:34:15.150: W/dalvikvm(15079): threadid=1: thread exiting with uncaught exception (group=0x40015560)
08-05 10:34:15.159: E/AndroidRuntime(15079): FATAL EXCEPTION: main
08-05 10:34:15.159: E/AndroidRuntime(15079): java.lang.ClassCastException: java.util.HashMap
08-05 10:34:15.159: E/AndroidRuntime(15079):    at com.example.chondrokotha5.MainActivity$2.onItemClick(MainActivity.java:136)
08-05 10:34:15.159: E/AndroidRuntime(15079):    at android.widget.AdapterView.performItemClick(AdapterView.java:284)
08-05 10:34:15.159: E/AndroidRuntime(15079):    at android.widget.ListView.performItemClick(ListView.java:3513)
08-05 10:34:15.159: E/AndroidRuntime(15079):    at android.widget.AbsListView$PerformClick.run(AbsListView.java:1812)
08-05 10:34:15.159: E/AndroidRuntime(15079):    at android.os.Handler.handleCallback(Handler.java:587)
08-05 10:34:15.159: E/AndroidRuntime(15079):    at android.os.Handler.dispatchMessage(Handler.java:92)
08-05 10:34:15.159: E/AndroidRuntime(15079):    at android.os.Looper.loop(Looper.java:123)
08-05 10:34:15.159: E/AndroidRuntime(15079):    at android.app.ActivityThread.main(ActivityThread.java:3683)
08-05 10:34:15.159: E/AndroidRuntime(15079):    at java.lang.reflect.Method.invokeNative(Native Method)
08-05 10:34:15.159: E/AndroidRuntime(15079):    at java.lang.reflect.Method.invoke(Method.java:507)
08-05 10:34:15.159: E/AndroidRuntime(15079):    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:839)
08-05 10:34:15.159: E/AndroidRuntime(15079):    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:597)
08-05 10:34:15.159: E/AndroidRuntime(15079):    at dalvik.system.NativeStart.main(Native Method)
08-05 10:35:13.449: W/KeyCharacterMap(15090): No keyboard for id 0
08-05 10:35:13.449: W/KeyCharacterMap(15090): Using default keymap: /system/usr/keychars/qwerty.kcm.bin
08-05 10:35:16.250: W/dalvikvm(15090): threadid=1: thread exiting with uncaught exception (group=0x40015560)
08-05 10:35:16.260: E/AndroidRuntime(15090): FATAL EXCEPTION: main
08-05 10:35:16.260: E/AndroidRuntime(15090): java.lang.ClassCastException:  java.util.HashMap
08-05 10:35:16.260: E/AndroidRuntime(15090):    at com.example.chondrokotha5.MainActivity$2.onItemClick(MainActivity.java:136)
08-05 10:35:16.260: E/AndroidRuntime(15090):    at android.widget.AdapterView.performItemClick(AdapterView.java:284)
08-05 10:35:16.260: E/AndroidRuntime(15090):    at android.widget.ListView.performItemClick(ListView.java:3513)
08-05 10:35:16.260: E/AndroidRuntime(15090):    at android.widget.AbsListView$PerformClick.run(AbsListView.java:1812)
08-05 10:35:16.260: E/AndroidRuntime(15090):    at android.os.Handler.handleCallback(Handler.java:587)
08-05 10:35:16.260: E/AndroidRuntime(15090):    at android.os.Handler.dispatchMessage(Handler.java:92)
08-05 10:35:16.260: E/AndroidRuntime(15090):    at android.os.Looper.loop(Looper.java:123)
 08-05 10:35:16.260: E/AndroidRuntime(15090):   at android.app.ActivityThread.main(ActivityThread.java:3683)
 08-05 10:35:16.260: E/AndroidRuntime(15090):   at java.lang.reflect.Method.invokeNative(Native Method)
08-05 10:35:16.260: E/AndroidRuntime(15090):    at java.lang.reflect.Method.invoke(Method.java:507)
 08-05 10:35:16.260: E/AndroidRuntime(15090):   at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:839)
 08-05 10:35:16.260: E/AndroidRuntime(15090):   at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:597)
 08-05 10:35:16.260: E/AndroidRuntime(15090):   at dalvik.system.NativeStart.main(Native Method)

我应该怎么做才能从列表视图中显示两个 rextview 的字符串？请任何人告诉我我做错了什么以及解决方案是什么？？？？

4

1 回答 1

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在你的 onclick 中试试这个 .. 它对我有用..

HashMap<String, String> sss = (HashMap<String, String>) listView.getItemAtPosition(position);

Toast.makeText(getBaseContext(), sss.get("key_word")+"---"+sss.get("key_meaning"), Toast.LENGTH_SHORT).show();

为什么你会收到一个类转换异常，你已经用list_of_wordmeanings哈希图中的数据填充了列表视图：

SimpleAdapter adapter = new SimpleAdapter(getBaseContext(), list_of_wordmeanings, R.layout.list_layout, from, to);

但是您正试图在列表视图 onItemClick 中检索光标对象。

于 2013-11-04T05:19:45.487 回答