Question

我正在尝试将ciicked listitem数据传递给另一个活动，但每当我点击任何列表项时都无法获取Toast，也无法将所选列表项值传递给另一个活动。

所以我想知道：

如何使用点击列表项将值从一个活动传递到另一个活动？

和第二

为什么不将点击列表项目位置显示到Toast中？

MainActivity.java：

@Override
        protected void onPostExecute(Void args) {
            // Locate the listview in listview_main.xml
            listview = (ListView) findViewById(R.id.listview);
            // Pass the results into ListViewAdapter.java
            adapter = new ListViewAdapter(MainActivity.this, arraylist);
            // Set the adapter to the ListView
            listview.setAdapter(adapter);
            // Close the progressdialog
            mProgressDialog.dismiss();

            listview.setOnItemClickListener(new OnItemClickListener() {

                @Override
                public void onItemClick(AdapterView<?> parent, View view,
                        int position, long id) {
                    Toast.makeText(MainActivity.this, position, Toast.LENGTH_LONG).show();
                    // TODO Auto-generated method stub
                    Intent intent = new Intent(MainActivity.this, SingleItemView.class);
                    // Pass all data rank
                    intent.putExtra("rank", arraylist.get(position).get(MainActivity.RANK));
                    // Start SingleItemView Class
                    startActivity(intent);
                }
            });         
        }

在 Log.d 收到错误后，请查看下面的完整日志

@Override
                public void onItemClick(AdapterView<?> parent, View view,
                        int position, long id) {
                    Toast.makeText(MainActivity.this, position, Toast.LENGTH_LONG).show();
                    // TODO Auto-generated method stub
                    Log.d("RANK::", arraylist.get(position).get(MainActivity.RANK));

日志：

06-04 18:21:12.725: E/AndroidRuntime(19957): FATAL EXCEPTION: main
06-04 18:21:12.725: E/AndroidRuntime(19957): android.content.res.Resources$NotFoundException: String resource ID #0x0
06-04 18:21:12.725: E/AndroidRuntime(19957):    at android.content.res.Resources.getText(Resources.java:242)
06-04 18:21:12.725: E/AndroidRuntime(19957):    at android.widget.Toast.makeText(Toast.java:304)
06-04 18:21:12.725: E/AndroidRuntime(19957):    at com.androidbegin.jsonparsetutorial.MainActivity$DownloadJSON$1.onItemClick(MainActivity.java:107)
06-04 18:21:12.725: E/AndroidRuntime(19957):    at android.widget.AdapterView.performItemClick(AdapterView.java:301)
06-04 18:21:12.725: E/AndroidRuntime(19957):    at android.widget.AbsListView.performItemClick(AbsListView.java:1280)
06-04 18:21:12.725: E/AndroidRuntime(19957):    at android.widget.AbsListView$PerformClick.run(AbsListView.java:3071)
06-04 18:21:12.725: E/AndroidRuntime(19957):    at android.widget.AbsListView$1.run(AbsListView.java:3972)
06-04 18:21:12.725: E/AndroidRuntime(19957):    at android.os.Handler.handleCallback(Handler.java:615)
06-04 18:21:12.725: E/AndroidRuntime(19957):    at android.os.Handler.dispatchMessage(Handler.java:92)
06-04 18:21:12.725: E/AndroidRuntime(19957):    at android.os.Looper.loop(Looper.java:137)
06-04 18:21:12.725: E/AndroidRuntime(19957):    at android.app.ActivityThread.main(ActivityThread.java:4921)
06-04 18:21:12.725: E/AndroidRuntime(19957):    at java.lang.reflect.Method.invokeNative(Native Method)
06-04 18:21:12.725: E/AndroidRuntime(19957):    at java.lang.reflect.Method.invoke(Method.java:511)
06-04 18:21:12.725: E/AndroidRuntime(19957):    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1036)
06-04 18:21:12.725: E/AndroidRuntime(19957):    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:803)
06-04 18:21:12.725: E/AndroidRuntime(19957):    at dalvik.system.NativeStart.main(Native Method)

Answer 1

尝试在onCreat中编写以下行而不是onPostExecute

listview = (ListView) findViewById(R.id.listview);

listview.setOnItemClickListener(new OnItemClickListener() {

                @Override
                public void onItemClick(AdapterView<?> parent, View view,
                        int position, long id) {
                    Toast.makeText(MainActivity.this, position, Toast.LENGTH_LONG).show();
                    // TODO Auto-generated method stub
                    Intent intent = new Intent(MainActivity.this, SingleItemView.class);
                    // Pass all data rank
                    intent.putExtra("rank", arraylist.get(position).get(MainActivity.RANK));
                    // Start SingleItemView Class
                    startActivity(intent);
                }
            });

Answer 2

更改此

Toast.makeText(MainActivity.this, position, Toast.LENGTH_LONG).show();

到

Toast.makeText(MainActivity.this, String.valueOf(position), Toast.LENGTH_LONG).show();

Answer 3

尝试使用setTag（Object）和getTag（）方法。在表示ListView中的行的每个视图上应用setTag（）。然后，在onItemClick（）方法中使用＆＃34; view＆＃34;变量，作为参数传递，使用getTag（）提取传递的值。您的解决方案看起来很好，但由于优化原因，建议使用标签将值传递给onClicks。

如何使用点击列表项将值从一个活动传递到另一个活动

3 个答案: